last time i ask

stanger9219 · 12-03-2003, 02:45 PM

ive posted this problem about three times already and thanks for the help so far. But nothing has worked. My problem is that my car surges and backfires, doesnt want to idle, and occassionally doesnt react when i push the gas. Heres the list of the things ive already replaced, and i had diagnostics already done

-EGR Valve
-TPS
-IAC
-Two temp. sensors, one next to the distr. the other under the upper intake
-Fuel pressure regulator
-fuel filter
-fuel pump
-new distributor
-spark plugs, wires, distr. cap
-clutch neutral safety switch
-no vacuum leaks
-timing is fine
-cleaned maf, tb, intake manifold
-ignition coil

Thats almost $700 just in parts that i have wasted on this car. Ive thought about just selling it but before this problem the car was in mint condition with a rebuilt motor that had about 16, 000 miles on it. With the car originally in such good condition, and after i spent soooo much time and money on it i dont want to sell it i just want to fix the problem. Im looking into the MAF but doubt that it is the problem. The problem is worse when the car is cold, but now is doing it all of the time. Thanks for any help guys. I love the car and would hate to see it go.

Hethj7 · 12-03-2003, 02:53 PM

You have said that you had diagnostics done, but you have never posted what codes came up.

And, did you ever check voltages from the MAF and TPS like was suggested in your other thread?

stanger9219 · 12-03-2003, 02:59 PM

The shop didnt give me the code, just what the codes meant. They were the EGR valve, IAC, TPS, ignitions coil, and clutch neatral safety switch. I put my brothers 94 maf on and it still ran like crap. How do i check the voltage of the maf and the tps? and if that is a problem how do i solve it?

Hethj7 · 12-03-2003, 03:18 PM

For your TPS:

How To Adjust TPS
"Muscle Mustangs & Fast Fords"
April 1993
A voltage reading must be taken using a digital volt/ohmmeter (DVOM) with the Key On/Engine Off and with the Key On/Engine Running. The TPS is located directly on top of the throttle body and is adjusted by loosening the two phillips mounting screws and swiveling the sensor until the highest reading is found. It may be necessary to elongate the holes with a small file to achieve the desired reading.

The spec range for Key On is from .88 to 1.0 volt; shoot for the .97 to .99 volt. With the engine running, the voltage should be no higher than 1.05 volts.

Incorrect Throttle Position Sensor (TPS) voltage will result in reduced performance. The best way to take a TPS voltage reading is by using two safety pins through the wires coming from the sensor. The positive lead is attached to the green wire, while the negative goes to the black wire. Always ground the meter through the sensor's black wire. This gives a direct, and more accurate ground into the computer.

As for the MAF voltage, it is in your other post. However, I am not sure which pin is which coming off the MAF. Sorry. Ask the guys that were posting about it in your other post. I am sure they would help out with more details.

stanger9219 · 12-03-2003, 04:07 PM

VICTORY!!!!! im retarded but it was the MAF...i did that little test by tapping on it and the car reacted everytime. went to buy a new one but have to take the old one out first so i dont have to pay the core charge...thanks a lot man

Hethj7 · 12-03-2003, 04:21 PM

Cool! I hope that ends up fixing it. By the way, what MAF are you buying and how much is it going to run you?

If you plan on doing an future mods and have to replace the MAF anyway, you may want to go ahead and buy a bigger one now. Just a thought.

stanger9219 · 12-03-2003, 11:27 PM

since i found that its the problem ive been running with the maf disconnected and the car hasnt missed a beat. I think im gonna get a 70mm mass air, but i have a cobra r hood coming on monday and have to pay the $130 shipping charge, so for right now im getting the stock $60 maf. thanks again man.

Hethj7 · 12-03-2003, 11:35 PM

Cool. I hope it keeps running strong for ya!

Bad89stang · 12-04-2003, 03:18 AM

Post up on this site or the corral for a used one. There is probably someone local to you that would do anything to get rid of their extra stock MAF. Somebody has one near you. $60 is rape for a stock MAF. Heck, go to a salvage and get one.

stanger9219 · 12-05-2003, 03:07 PM

alright, i went to Advanced Auto Parts and bought a remanufactured MAF because i was planning on buying a bigger one later on. The maf i took off of my car had a small hole where the air went through (duh)...but this new one i got, which is supposed to be stock, IS COMPLETELY HOLLOW. All there is is the sensor and a hollow pipe. So the hole for the air to go through is about twice the size of the old one. does this mean anything or am i over reacting????

Hethj7 · 12-05-2003, 04:20 PM

I can't quite picture what you are talking about, but as long as the sensor knows how much air is going past it, it shouldn't matter. Hell, just plug the thing in and see how she runs!

stanger9219 · 12-06-2003, 01:42 AM

I hooked it up and the car runs like new, but its been rainging and its about to start snowing so i havent been able to hook up and see if there are any noticeable gains.

OMAR · 12-07-2003, 12:40 AM

Quote:

Originally posted by stanger9219
since i found that its the problem ive been running with the maf disconnected and the car hasnt missed a beat.

Am I understanding this right? You ran your Stang w/ the MAM not plug in, and it ran fine? I would think that would make the computer go crazy in closed loop!

stanger9219 · 12-07-2003, 01:50 PM

It ran fine for about the 20 minutes that i dissconnected it. I dont know why but it just did. I was told that the computer set it self at neutral and just let all the air the motor needed to go through

Mach 1 · 12-07-2003, 04:36 PM

Quote:

Originally posted by OMAR
Am I understanding this right? You ran your Stang w/ the MAM not plug in, and it ran fine? I would think that would make the computer go crazy in closed loop!

Yeah, it shouldnt run good at all disconnected. Strange.

BTW, i have a stock MAF for sale if you still want one. Its an original ford unit from a 93 GT in excellent condition, had about 60K miles when pulled from the car.

12-03-2003, 02:45 PM	#1
stanger9219 Registered Member Join Date: Sep 2003 Location: st. louis, MO Posts: 197	last time i ask ive posted this problem about three times already and thanks for the help so far. But nothing has worked. My problem is that my car surges and backfires, doesnt want to idle, and occassionally doesnt react when i push the gas. Heres the list of the things ive already replaced, and i had diagnostics already done -EGR Valve -TPS -IAC -Two temp. sensors, one next to the distr. the other under the upper intake -Fuel pressure regulator -fuel filter -fuel pump -new distributor -spark plugs, wires, distr. cap -clutch neutral safety switch -no vacuum leaks -timing is fine -cleaned maf, tb, intake manifold -ignition coil Thats almost $700 just in parts that i have wasted on this car. Ive thought about just selling it but before this problem the car was in mint condition with a rebuilt motor that had about 16, 000 miles on it. With the car originally in such good condition, and after i spent soooo much time and money on it i dont want to sell it i just want to fix the problem. Im looking into the MAF but doubt that it is the problem. The problem is worse when the car is cold, but now is doing it all of the time. Thanks for any help guys. I love the car and would hate to see it go. __________________ 98 Cobra, CAI, Flowmasters, o/r h-pipe. 4.10s, Hurst shifter.

12-03-2003, 02:53 PM	#2
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	You have said that you had diagnostics done, but you have never posted what codes came up. And, did you ever check voltages from the MAF and TPS like was suggested in your other thread? __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

12-03-2003, 02:59 PM	#3
stanger9219 Registered Member Join Date: Sep 2003 Location: st. louis, MO Posts: 197	The shop didnt give me the code, just what the codes meant. They were the EGR valve, IAC, TPS, ignitions coil, and clutch neatral safety switch. I put my brothers 94 maf on and it still ran like crap. How do i check the voltage of the maf and the tps? and if that is a problem how do i solve it? __________________ 98 Cobra, CAI, Flowmasters, o/r h-pipe. 4.10s, Hurst shifter.

12-03-2003, 03:18 PM	#4
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	For your TPS: How To Adjust TPS "Muscle Mustangs & Fast Fords" April 1993 A voltage reading must be taken using a digital volt/ohmmeter (DVOM) with the Key On/Engine Off and with the Key On/Engine Running. The TPS is located directly on top of the throttle body and is adjusted by loosening the two phillips mounting screws and swiveling the sensor until the highest reading is found. It may be necessary to elongate the holes with a small file to achieve the desired reading. The spec range for Key On is from .88 to 1.0 volt; shoot for the .97 to .99 volt. With the engine running, the voltage should be no higher than 1.05 volts. Incorrect Throttle Position Sensor (TPS) voltage will result in reduced performance. The best way to take a TPS voltage reading is by using two safety pins through the wires coming from the sensor. The positive lead is attached to the green wire, while the negative goes to the black wire. Always ground the meter through the sensor's black wire. This gives a direct, and more accurate ground into the computer. As for the MAF voltage, it is in your other post. However, I am not sure which pin is which coming off the MAF. Sorry. Ask the guys that were posting about it in your other post. I am sure they would help out with more details. __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

12-03-2003, 04:07 PM	#5
stanger9219 Registered Member Join Date: Sep 2003 Location: st. louis, MO Posts: 197	VICTORY!!!!! im retarded but it was the MAF...i did that little test by tapping on it and the car reacted everytime. went to buy a new one but have to take the old one out first so i dont have to pay the core charge...thanks a lot man __________________ 98 Cobra, CAI, Flowmasters, o/r h-pipe. 4.10s, Hurst shifter.

12-03-2003, 04:21 PM	#6
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	Cool! I hope that ends up fixing it. By the way, what MAF are you buying and how much is it going to run you? If you plan on doing an future mods and have to replace the MAF anyway, you may want to go ahead and buy a bigger one now. Just a thought. __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

12-03-2003, 11:27 PM	#7
stanger9219 Registered Member Join Date: Sep 2003 Location: st. louis, MO Posts: 197	since i found that its the problem ive been running with the maf disconnected and the car hasnt missed a beat. I think im gonna get a 70mm mass air, but i have a cobra r hood coming on monday and have to pay the $130 shipping charge, so for right now im getting the stock $60 maf. thanks again man. __________________ 98 Cobra, CAI, Flowmasters, o/r h-pipe. 4.10s, Hurst shifter.

12-03-2003, 11:35 PM	#8
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	Cool. I hope it keeps running strong for ya! __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

12-04-2003, 03:18 AM	#9
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	$60 Post up on this site or the corral for a used one. There is probably someone local to you that would do anything to get rid of their extra stock MAF. Somebody has one near you. $60 is rape for a stock MAF. Heck, go to a salvage and get one.

12-05-2003, 03:07 PM	#10
stanger9219 Registered Member Join Date: Sep 2003 Location: st. louis, MO Posts: 197	alright, i went to Advanced Auto Parts and bought a remanufactured MAF because i was planning on buying a bigger one later on. The maf i took off of my car had a small hole where the air went through (duh)...but this new one i got, which is supposed to be stock, IS COMPLETELY HOLLOW. All there is is the sensor and a hollow pipe. So the hole for the air to go through is about twice the size of the old one. does this mean anything or am i over reacting???? __________________ 98 Cobra, CAI, Flowmasters, o/r h-pipe. 4.10s, Hurst shifter.

12-05-2003, 04:20 PM	#11
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	I can't quite picture what you are talking about, but as long as the sensor knows how much air is going past it, it shouldn't matter. Hell, just plug the thing in and see how she runs! __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

12-06-2003, 01:42 AM	#12
stanger9219 Registered Member Join Date: Sep 2003 Location: st. louis, MO Posts: 197	I hooked it up and the car runs like new, but its been rainging and its about to start snowing so i havent been able to hook up and see if there are any noticeable gains. __________________ 98 Cobra, CAI, Flowmasters, o/r h-pipe. 4.10s, Hurst shifter.

12-07-2003, 01:50 PM	#14
stanger9219 Registered Member Join Date: Sep 2003 Location: st. louis, MO Posts: 197	It ran fine for about the 20 minutes that i dissconnected it. I dont know why but it just did. I was told that the computer set it self at neutral and just let all the air the motor needed to go through __________________ 98 Cobra, CAI, Flowmasters, o/r h-pipe. 4.10s, Hurst shifter.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
My report from racing at the NMRA event in Bowling Green (was ATTN: Lt. Dan)	andy669	Racer's Club House	12	10-08-2003 02:41 PM
Towed away this time! (Long)	1988GTCONERTIBLE	Windsor Power	6	10-26-2001 06:05 PM
Turning over a new leaf. Time to be Jerk Damien!	Mercury	Blue Oval Lounge	24	10-25-2001 01:43 PM