Cant Wont Accelerate past 3000rpms

caliplaya650 · 08-25-2001, 05:54 PM

I just installed bbk headers/65 mm Throttle body. THe car wont accelerate past 3000rpms. I punch it in 1st gear and the car will hit 3krpm and feels like its in neutral. I can keep it in 3rd gear punch it all the way down it hits 3krpm and it wont go.
What is goin on? Is there something wrong with the Throttle body????
Also the new TB whistless.

------------------
1992 Mustang 5.0
BBK cold air intake
Dual Flows w/ H Pipe
BBK Underdrive Pulleys
BBK 65mm Throttle Body

AB89GT · 08-26-2001, 10:08 AM

Is your fuel system all stock? Cause if so, it could be getting too much air and gets starved of fuel. Possibly just a higher volume fuel pump could help you there.

hope this helps...

------------------
89 black GT, 5 spd
flex-a-lite electric fan
flowmaster cat-back + h-pipe
1 5/8 equal length shorty headers
MSD Blaster coil

caliplaya650 · 08-26-2001, 03:47 PM

No it's not the due to insufficient fuel b/c i put back the old TB and still got the same results. IM pretty sure it is the O2 sensor b/c the car wont go past 2500 rpm. ANd thats when the o2 either starts to run the car richer or leaner.

------------------
1992 Mustang 5.0
BBK cold air intake
Dual Flows w/ H Pipe
BBK Underdrive Pulleys
BBK 65mm Throttle Body

STOCK LX · 08-26-2001, 11:25 PM

It may sound simple, but did something get moved into the way of the throttle linkage? That happened to me once, and I couldn't get full throttle. Might want to check it out.

mustang17 · 08-26-2001, 11:37 PM

I bet it's the MAF. I had the same problem you have. Run a code scan and let us know.

------------------
1995 GT Black- Edelbrock 6037's,Intake,Edelbrock cam,70mm TB,75mm pro-m,Taylor wires, pulleys,Equal length headers,K&N filter
Flowmaster,3.73's, Eibach pro rate springs
lower control arms Centerforce clutch
New motor in the works!

caliplaya650 · 08-27-2001, 11:20 AM

Here are some of the exact symptoms:
1)The car has good pick up b4 2500 rpm On the punch
2)Once i hit 40+mph the car has no more punch.
3)2500-3000 the car surges,hesitates to go, and gives a put put. Any ideas?

When i installed the headers and tb. the only cables i disconnected where the
airflow sensor/
Idle control unit/
the cable on the tb. that has 3 pins/
and the negative battery cable.

Any ideas yet? I was wondering if when i installed the headers if they didnt sit properly and had a opening and air was getting in could it mess up the o2 sensor reading????
------------------
1992 Mustang 5.0
BBK cold air intake
Dual Flows w/ H Pipe
BBK Underdrive Pulleys
BBK 65mm Throttle Body

[This message has been edited by caliplaya650 (edited 08-27-2001).]

[This message has been edited by caliplaya650 (edited 08-27-2001).]

mustang17 · 08-27-2001, 02:25 PM

I'm almost 100% sure it's your air meter. It may just be a bad connection or it could be the meter is dead. A code scan will tell you for sure. If you have a buddy who can loan you his MAF, try that first.

Good luck

------------------
1995 GT Black- Edelbrock 6037's,Intake,Edelbrock cam,70mm TB,75mm pro-m,Taylor wires, pulleys,Equal length headers,K&N filter
Flowmaster,3.73's, Eibach pro rate springs
lower control arms Centerforce clutch
New motor in the works!

caliplaya650 · 08-28-2001, 01:05 AM

I've ran the codes but i dont seem to get any it will beep once (pause) once (pause) which is a code 11 system ok. If there is another way to listen/use the coder reader let me know. I dont think it would be the air meter (the black box that says
"air flow <===="??) B/c it was working fine b4 the installs. Could it be that the headers on the right side arent sitting properly???? and air coming in is ****ing up the rpm's??

------------------
1992 Mustang 5.0
BBK cold air intake
Dual Flows w/ H Pipe
BBK Underdrive Pulleys
BBK 65mm Throttle Body

caliplaya650 · 08-28-2001, 09:19 PM

i Ran the Ford code reader and im not too sure if i was reading it ryt but i got these codes. beep beep _____ beep beep
which was about code 22???? The second code after a long pause was beep x 3(a small pause) x 3
a longer pause beep x3 (a small pause) beep x 3
So would that be code 33/33 or code 66????????
code 22=Manifold absolute pressure (MAP) or BARO sensor out of range
code 33= EGR Valve not opening properly
If code 33 is really code 66 it would be= VAF/Mass Air Flow sensor fault, below minimum voltage.

HELP!!!!!!!!

------------------
1992 Mustang 5.0
BBK cold air intake
Dual Flows w/ H Pipe
BBK Underdrive Pulleys
BBK 65mm Throttle Body

caliplaya650 · 09-08-2001, 08:43 PM

I still havent had any luck w/ the problem. Could it be that the throttle linkage is not working properly??
Also the car has an exhaust backfire somewhere between the headers and the 2nd cat converter?
Any ideas..

------------------
1992 Mustang 5.0
BBK cold air intake
Dual Flows w/ H Pipe
BBK Underdrive Pulleys
BBK 65mm Throttle Body

Unit 5302 · 09-08-2001, 09:28 PM

Well, you can throw the O2 sensor theory out. The codes you got should be a hint that your MAF is indeed malfunctioning.

The O2 sensor does not affect the car at wide open throttle. The car goes into "open loop" mode and ignores emissions components.

The EGR valve will also not affect you at wide open throttle, it's for idle.

Also, the baro/map sensor code shouldn't concern you. Not at wide open throttle. The MAF sensor would override it anyway.

Make sure your MAF sensor is properly connected. If it is mustang17 more than likely hit the nail on the head.

PKRWUD · 09-09-2001, 03:16 AM

Just out of curiosity, what did you adjust your TPS to after installing the TB? Have you pulled codes with the engine running (KOER), or just with the engine off (KOEO)?

Take care
~Chris

------------------
Retired Moderator
MustangNet

My site: JimPorterRacing

RACECAR spelled backwards is RACECAR

HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

caliplaya650 · 09-10-2001, 11:44 AM

I have only ran the KOEO test and recieved the codes mentioned above. When i setup the tb. I adjusted the Idle to 750rpm. Measured the Voltage and it was fine between .5 -.8.
How would i run the KOER Tests.

What i dont understand is that everything ran perfect before the installs???
Also the tb whistles.?

------------------
1992 Mustang 5.0
BBK cold air intake
Dual Flows w/ H Pipe
BBK Underdrive Pulleys
BBK 65mm Throttle Body

mustangtim · 09-10-2001, 12:03 PM

A quick way to check if it is your MAF is to unplug it. It will run like crap at idle, but it should run fine at WOT. If the problem clears it is your MAF.

5ohCOUPE · 09-10-2001, 12:40 PM

PUT THE TPS VOLTAGE TO .999 AND SEE WHAT HAPPENS.

PKRWUD · 09-10-2001, 03:11 PM

DO NOT SET IT TO .999! I still can't believe there are people out there who like to screw up their idle believing that gives them performance. Probably still believe in the tooth fairy, too.

To pull KOER codes, make sure the engine is warmed up.
Shut it off.
Insert your jumper.
Start engine.
Shut off Engine.
Wait 10 seconds, and restart engine.
Ignore the MIL at first.
After about 15 seconds, watch for a single MIL flash.
When it flashes, quickly push the gas pedal all the way to the floor, and release.
Within 10 to 20 seconds, you should start receiving MIL flashes that are the codes. They will repeat twice. Write them down and shut off the engine.

Post them here.

Take care
~Chris

------------------
Retired Moderator
MustangNet

My site: JimPorterRacing

RACECAR spelled backwards is RACECAR

HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

caliplaya650 · 09-10-2001, 04:26 PM

PKRWUD, I ran the KOEO codes and got 1st=66
2nd=66. 66= VAF/ Mass Air Flow Fault, Below minimum voltage.

When i ran the KOER test i got back no codes.
But i did get the 4 beeps at the beginning and later 1 1 1 11.
Could ihave done it wrong?
THe car idled and would later speed up idle down speed up.

I also tried disconnecting the MAF at idle it did run hard but seemed to smooth out at WOT. What symptons should i have experianced.
I didnt notice little to no diffrence w/ the MAF Plugged VS Unplugged.

------------------
1992 Mustang 5.0
BBK cold air intake
Dual Flows w/ H Pipe
BBK Underdrive Pulleys
BBK 65mm Throttle Body

5ohCOUPE · 09-10-2001, 05:20 PM

MINE IDLES FINE WITH IT SET AT .999. FROM THE FACTORY MINE WAS AT .997.

PKRWUD · 09-10-2001, 05:49 PM

caliplaya650-
If the code 66 didn't reoccur during KOER, then it's an old code. You mentioned the TB whistling. You need to isolate this. Air entering the system after the MAF can trip a code 66, and since it didn't come back during KOER, I don't think it's a wiring problem. Make sure there aren't any leaks after the MAF, disconnect the neg battery cable, turn on the headlight switch (to discharge any capacitors), turn it off, attach the neg battery cable, and perform a KOEO test. It should pass. Then perform another KOER test, and post the results.

Take care
~Chris

------------------
Retired Moderator
MustangNet

My site: JimPorterRacing

RACECAR spelled backwards is RACECAR

HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

PKRWUD · 09-10-2001, 06:04 PM

5ohCOUPE-
You are very lucky if you haven't experienced any problems yet, but you will. The ECM uses the TPS voltage to understand many things, including driver intent. When the TPS reaches 1 volt, the ECM believes you are no longer sitting at idle, but are attempting to drive. It will make adjustments trying to compensate for this, which will give you an unstable idle rpm and mixture. This will lead to eventual clogging of the cats, dilution of the oil, and accelerated wear and tear. I'm not sure where you bought your car, but I have never seen a factory TPS spec at .997 vdc. It's way too close to 1 volt, and as the TPS starts to wear, it will reach 1 volt. There was a popular rumor that ran around for a while in which the thinking was that the closer you could get your TPS to 1 volt, the snappier your throttle response would be. This is based in truth, but exagerated. There is not a human alive that can tell the difference in throttle responsiveness when the TPS is set at .95 vs. .999. In fact, 5.0 MA SEFI Mustangs have a minimum setting of .39 vdc, and a recommended setting of .601 (+/- 3%).

Obviously, you can set yours however you like, but why risk the trouble for no gain???

Take care
~Chris

------------------
Retired Moderator
MustangNet

My site: JimPorterRacing

RACECAR spelled backwards is RACECAR

HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

08-25-2001, 05:54 PM	#1
caliplaya650 Registered Member Join Date: Jul 2001 Location: Moses Lake, Wa USA Posts: 72	Cant Wont Accelerate past 3000rpms I just installed bbk headers/65 mm Throttle body. THe car wont accelerate past 3000rpms. I punch it in 1st gear and the car will hit 3krpm and feels like its in neutral. I can keep it in 3rd gear punch it all the way down it hits 3krpm and it wont go. What is goin on? Is there something wrong with the Throttle body???? Also the new TB whistless. ------------------ 1992 Mustang 5.0 BBK cold air intake Dual Flows w/ H Pipe BBK Underdrive Pulleys BBK 65mm Throttle Body

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08-26-2001, 10:08 AM	#2
AB89GT Registered Member Join Date: Nov 2000 Location: Rockville, MD Posts: 49	Is your fuel system all stock? Cause if so, it could be getting too much air and gets starved of fuel. Possibly just a higher volume fuel pump could help you there. hope this helps... ------------------ 89 black GT, 5 spd flex-a-lite electric fan flowmaster cat-back + h-pipe 1 5/8 equal length shorty headers MSD Blaster coil

08-26-2001, 03:47 PM	#3
caliplaya650 Registered Member Join Date: Jul 2001 Location: Moses Lake, Wa USA Posts: 72	No it's not the due to insufficient fuel b/c i put back the old TB and still got the same results. IM pretty sure it is the O2 sensor b/c the car wont go past 2500 rpm. ANd thats when the o2 either starts to run the car richer or leaner. ------------------ 1992 Mustang 5.0 BBK cold air intake Dual Flows w/ H Pipe BBK Underdrive Pulleys BBK 65mm Throttle Body

08-26-2001, 11:25 PM	#4
STOCK LX Registered Member Join Date: Jan 2001 Location: San Jose Posts: 11	It may sound simple, but did something get moved into the way of the throttle linkage? That happened to me once, and I couldn't get full throttle. Might want to check it out.

08-26-2001, 11:37 PM	#5
mustang17 Registered Member Join Date: Sep 2000 Location: Concord, MA, USA Posts: 264	I bet it's the MAF. I had the same problem you have. Run a code scan and let us know. ------------------ 1995 GT Black- Edelbrock 6037's,Intake,Edelbrock cam,70mm TB,75mm pro-m,Taylor wires, pulleys,Equal length headers,K&N filter Flowmaster,3.73's, Eibach pro rate springs lower control arms Centerforce clutch New motor in the works!

08-27-2001, 11:20 AM	#6
caliplaya650 Registered Member Join Date: Jul 2001 Location: Moses Lake, Wa USA Posts: 72	Here are some of the exact symptoms: 1)The car has good pick up b4 2500 rpm On the punch 2)Once i hit 40+mph the car has no more punch. 3)2500-3000 the car surges,hesitates to go, and gives a put put. Any ideas? When i installed the headers and tb. the only cables i disconnected where the airflow sensor/ Idle control unit/ the cable on the tb. that has 3 pins/ and the negative battery cable. Any ideas yet? I was wondering if when i installed the headers if they didnt sit properly and had a opening and air was getting in could it mess up the o2 sensor reading???? ------------------ 1992 Mustang 5.0 BBK cold air intake Dual Flows w/ H Pipe BBK Underdrive Pulleys BBK 65mm Throttle Body [This message has been edited by caliplaya650 (edited 08-27-2001).] [This message has been edited by caliplaya650 (edited 08-27-2001).]

08-27-2001, 02:25 PM	#7
mustang17 Registered Member Join Date: Sep 2000 Location: Concord, MA, USA Posts: 264	I'm almost 100% sure it's your air meter. It may just be a bad connection or it could be the meter is dead. A code scan will tell you for sure. If you have a buddy who can loan you his MAF, try that first. Good luck ------------------ 1995 GT Black- Edelbrock 6037's,Intake,Edelbrock cam,70mm TB,75mm pro-m,Taylor wires, pulleys,Equal length headers,K&N filter Flowmaster,3.73's, Eibach pro rate springs lower control arms Centerforce clutch New motor in the works!

08-28-2001, 01:05 AM	#8
caliplaya650 Registered Member Join Date: Jul 2001 Location: Moses Lake, Wa USA Posts: 72	I've ran the codes but i dont seem to get any it will beep once (pause) once (pause) which is a code 11 system ok. If there is another way to listen/use the coder reader let me know. I dont think it would be the air meter (the black box that says "air flow <===="??) B/c it was working fine b4 the installs. Could it be that the headers on the right side arent sitting properly???? and air coming in is ****ing up the rpm's?? ------------------ 1992 Mustang 5.0 BBK cold air intake Dual Flows w/ H Pipe BBK Underdrive Pulleys BBK 65mm Throttle Body

08-28-2001, 09:19 PM	#9
caliplaya650 Registered Member Join Date: Jul 2001 Location: Moses Lake, Wa USA Posts: 72	i Ran the Ford code reader and im not too sure if i was reading it ryt but i got these codes. beep beep _____ beep beep which was about code 22???? The second code after a long pause was beep x 3(a small pause) x 3 a longer pause beep x3 (a small pause) beep x 3 So would that be code 33/33 or code 66???????? code 22=Manifold absolute pressure (MAP) or BARO sensor out of range code 33= EGR Valve not opening properly If code 33 is really code 66 it would be= VAF/Mass Air Flow sensor fault, below minimum voltage. HELP!!!!!!!! ------------------ 1992 Mustang 5.0 BBK cold air intake Dual Flows w/ H Pipe BBK Underdrive Pulleys BBK 65mm Throttle Body

09-08-2001, 08:43 PM	#10
caliplaya650 Registered Member Join Date: Jul 2001 Location: Moses Lake, Wa USA Posts: 72	I still havent had any luck w/ the problem. Could it be that the throttle linkage is not working properly?? Also the car has an exhaust backfire somewhere between the headers and the 2nd cat converter? Any ideas.. ------------------ 1992 Mustang 5.0 BBK cold air intake Dual Flows w/ H Pipe BBK Underdrive Pulleys BBK 65mm Throttle Body

09-08-2001, 09:28 PM	#11
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Well, you can throw the O2 sensor theory out. The codes you got should be a hint that your MAF is indeed malfunctioning. The O2 sensor does not affect the car at wide open throttle. The car goes into "open loop" mode and ignores emissions components. The EGR valve will also not affect you at wide open throttle, it's for idle. Also, the baro/map sensor code shouldn't concern you. Not at wide open throttle. The MAF sensor would override it anyway. Make sure your MAF sensor is properly connected. If it is mustang17 more than likely hit the nail on the head.

09-09-2001, 03:16 AM	#12
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Just out of curiosity, what did you adjust your TPS to after installing the TB? Have you pulled codes with the engine running (KOER), or just with the engine off (KOEO)? Take care ~Chris ------------------ Retired Moderator MustangNet My site: JimPorterRacing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

09-10-2001, 11:44 AM	#13
caliplaya650 Registered Member Join Date: Jul 2001 Location: Moses Lake, Wa USA Posts: 72	I have only ran the KOEO test and recieved the codes mentioned above. When i setup the tb. I adjusted the Idle to 750rpm. Measured the Voltage and it was fine between .5 -.8. How would i run the KOER Tests. What i dont understand is that everything ran perfect before the installs??? Also the tb whistles.? ------------------ 1992 Mustang 5.0 BBK cold air intake Dual Flows w/ H Pipe BBK Underdrive Pulleys BBK 65mm Throttle Body

09-10-2001, 12:03 PM	#14
mustangtim Registered Member Join Date: Jul 2001 Location: Houston Posts: 10	A quick way to check if it is your MAF is to unplug it. It will run like crap at idle, but it should run fine at WOT. If the problem clears it is your MAF.

09-10-2001, 12:40 PM	#15
5ohCOUPE Registered Member Join Date: Sep 2001 Location: ORANGE PARK FL. USA Posts: 208	PUT THE TPS VOLTAGE TO .999 AND SEE WHAT HAPPENS.

09-10-2001, 03:11 PM	#16
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	DO NOT SET IT TO .999! I still can't believe there are people out there who like to screw up their idle believing that gives them performance. Probably still believe in the tooth fairy, too. To pull KOER codes, make sure the engine is warmed up. Shut it off. Insert your jumper. Start engine. Shut off Engine. Wait 10 seconds, and restart engine. Ignore the MIL at first. After about 15 seconds, watch for a single MIL flash. When it flashes, quickly push the gas pedal all the way to the floor, and release. Within 10 to 20 seconds, you should start receiving MIL flashes that are the codes. They will repeat twice. Write them down and shut off the engine. Post them here. Take care ~Chris ------------------ Retired Moderator MustangNet My site: JimPorterRacing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

09-10-2001, 04:26 PM	#17
caliplaya650 Registered Member Join Date: Jul 2001 Location: Moses Lake, Wa USA Posts: 72	PKRWUD, I ran the KOEO codes and got 1st=66 2nd=66. 66= VAF/ Mass Air Flow Fault, Below minimum voltage. When i ran the KOER test i got back no codes. But i did get the 4 beeps at the beginning and later 1 1 1 11. Could ihave done it wrong? THe car idled and would later speed up idle down speed up. I also tried disconnecting the MAF at idle it did run hard but seemed to smooth out at WOT. What symptons should i have experianced. I didnt notice little to no diffrence w/ the MAF Plugged VS Unplugged. ------------------ 1992 Mustang 5.0 BBK cold air intake Dual Flows w/ H Pipe BBK Underdrive Pulleys BBK 65mm Throttle Body

09-10-2001, 05:20 PM	#18
5ohCOUPE Registered Member Join Date: Sep 2001 Location: ORANGE PARK FL. USA Posts: 208	MINE IDLES FINE WITH IT SET AT .999. FROM THE FACTORY MINE WAS AT .997.

09-10-2001, 05:49 PM	#19
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	caliplaya650- If the code 66 didn't reoccur during KOER, then it's an old code. You mentioned the TB whistling. You need to isolate this. Air entering the system after the MAF can trip a code 66, and since it didn't come back during KOER, I don't think it's a wiring problem. Make sure there aren't any leaks after the MAF, disconnect the neg battery cable, turn on the headlight switch (to discharge any capacitors), turn it off, attach the neg battery cable, and perform a KOEO test. It should pass. Then perform another KOER test, and post the results. Take care ~Chris ------------------ Retired Moderator MustangNet My site: JimPorterRacing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

09-10-2001, 06:04 PM	#20
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	5ohCOUPE- You are very lucky if you haven't experienced any problems yet, but you will. The ECM uses the TPS voltage to understand many things, including driver intent. When the TPS reaches 1 volt, the ECM believes you are no longer sitting at idle, but are attempting to drive. It will make adjustments trying to compensate for this, which will give you an unstable idle rpm and mixture. This will lead to eventual clogging of the cats, dilution of the oil, and accelerated wear and tear. I'm not sure where you bought your car, but I have never seen a factory TPS spec at .997 vdc. It's way too close to 1 volt, and as the TPS starts to wear, it will reach 1 volt. There was a popular rumor that ran around for a while in which the thinking was that the closer you could get your TPS to 1 volt, the snappier your throttle response would be. This is based in truth, but exagerated. There is not a human alive that can tell the difference in throttle responsiveness when the TPS is set at .95 vs. .999. In fact, 5.0 MA SEFI Mustangs have a minimum setting of .39 vdc, and a recommended setting of .601 (+/- 3%). Obviously, you can set yours however you like, but why risk the trouble for no gain??? Take care ~Chris ------------------ Retired Moderator MustangNet My site: JimPorterRacing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!