94 mustang trouble

friendsmustangprobs · 11-16-2006, 11:42 PM

My friend has a 94 mustang gt with the 5.0L engine. It started losing power slowly and then it got really bad. He replaced the timing chain, we checked fuel pressure which was in specs, checked the timing which is within specs, and no codes are being thrown. At the moment there is still a loss in power and at high rpms the engine sputters pretty bad. Any ideas? thanks in advance

richs347 · 11-17-2006, 06:30 AM

How about the ignition coil???

Jeff Chambers · 11-17-2006, 07:58 AM

Has he performed a static compression test or cylinder leak-down test?

friendsmustangprobs · 11-17-2006, 11:16 AM

The spark appeared really good and strong. Could the the coil still have a problem when it shows good spark? He will be doing the compression test some time today, I had to give him my guage. We have also watched the coolant with the engine fully warmed, t-stat open, and there are no bubbles in the coolant so we dont think the head gaskets are blow. Is it possible his valve springs are weak?

richs347 · 11-17-2006, 01:48 PM

I threw out the coil idea because it gets worse at high rpm. Thinking at idle you get a good charge but maybe having a dying coil that doesn't deliver at high rpm. Thats a simple check with a volt meter - the specs are in the haynes manual. I figured if you had already done the timing chain, you may have done the compression check. How old are the 02's? Again, just guessing with limited info.. How many miles on the car and is it a stock 5.0?

Gearhead999 · 11-17-2006, 09:31 PM

You said the fuel pressure was good. Did you check the pump for volumn??

antyates · 11-17-2006, 10:27 PM

change the cam to the f303 and replace the valve train.

friendsmustangprobs · 11-18-2006, 03:33 AM

The ignition coil is an aftermarket one, i think he said he got it from hypertech or something last year. I will check the voltage output next. The o2 sensors are good, i tested them and compared to specs. Plus it does it when the computer is cool and in open loop also. There are about 130,000 miles on the engine and it is all stock besides the cold air intake, aftermarket coil and plugwires, and a few chrome pieces here and there. How would I check pump volume? the guage only had psi

1979bruiser · 11-18-2006, 07:12 PM

i would try the stock coil, i have had a bad coil in the past that was a aftermarket go bad not long after i got it.

lugthug713 · 11-20-2006, 09:14 PM

what about teh cat. converters, they could be clogged

friendsmustangprobs · 11-20-2006, 11:46 PM

5 month old high flow cats and catback exhaust

USMC302 · 11-24-2006, 08:22 PM

Has the smog pump been removed? If so the cats will go bad, high flow or not.

What RPM is the noticable drop in power?

1979bruiser · 11-25-2006, 09:28 AM

down here in southern md we have no emissions testing so smog pumps cats etc dont exist. whats that??? cant help w/ that part.

1979bruiser · 11-25-2006, 09:29 AM

do you have the stock h-pipee you could try?

USMC302 · 11-28-2006, 04:46 PM

You said you checked the timing and it was "in specs", What was it at exectly? You checked it with the spout out right?

USMC302 · 11-28-2006, 05:01 PM

You said you checked the timing and it was "in specs", What was it at exectly? You checked it with the spout out right?

11-16-2006, 11:42 PM	#1
friendsmustangprobs Registered Member Join Date: Nov 2006 Posts: 4	94 mustang trouble My friend has a 94 mustang gt with the 5.0L engine. It started losing power slowly and then it got really bad. He replaced the timing chain, we checked fuel pressure which was in specs, checked the timing which is within specs, and no codes are being thrown. At the moment there is still a loss in power and at high rpms the engine sputters pretty bad. Any ideas? thanks in advance

11-17-2006, 06:30 AM	#2
richs347 Registered Member Join Date: Mar 2002 Location: Manassas, VA Posts: 24	Re: 94 mustang trouble How about the ignition coil??? __________________ 1992 GT; 347 w/ a Vortech V2 SQ S-Trim, PMS, ... www.mustangpartstech.com

11-17-2006, 07:58 AM	#3
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: 94 mustang trouble Has he performed a static compression test or cylinder leak-down test? __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

11-17-2006, 11:16 AM	#4
friendsmustangprobs Registered Member Join Date: Nov 2006 Posts: 4	Re: 94 mustang trouble The spark appeared really good and strong. Could the the coil still have a problem when it shows good spark? He will be doing the compression test some time today, I had to give him my guage. We have also watched the coolant with the engine fully warmed, t-stat open, and there are no bubbles in the coolant so we dont think the head gaskets are blow. Is it possible his valve springs are weak?

11-17-2006, 01:48 PM	#5
richs347 Registered Member Join Date: Mar 2002 Location: Manassas, VA Posts: 24	Re: 94 mustang trouble I threw out the coil idea because it gets worse at high rpm. Thinking at idle you get a good charge but maybe having a dying coil that doesn't deliver at high rpm. Thats a simple check with a volt meter - the specs are in the haynes manual. I figured if you had already done the timing chain, you may have done the compression check. How old are the 02's? Again, just guessing with limited info.. How many miles on the car and is it a stock 5.0? __________________ 1992 GT; 347 w/ a Vortech V2 SQ S-Trim, PMS, ... www.mustangpartstech.com

11-17-2006, 09:31 PM	#6
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	Re: 94 mustang trouble You said the fuel pressure was good. Did you check the pump for volumn?? __________________ "Support our Troops" Dave 1968 Cougar 2004 Thunderbird 2007 F150 Harley-Davidson, SuperCrew 1986 LTD 1997 Ranger 1992 Honda Civic

11-17-2006, 10:27 PM	#7
antyates Registered Member Join Date: Jun 2006 Posts: 20	Re: 94 mustang trouble change the cam to the f303 and replace the valve train.

11-18-2006, 03:33 AM	#8
friendsmustangprobs Registered Member Join Date: Nov 2006 Posts: 4	Re: 94 mustang trouble The ignition coil is an aftermarket one, i think he said he got it from hypertech or something last year. I will check the voltage output next. The o2 sensors are good, i tested them and compared to specs. Plus it does it when the computer is cool and in open loop also. There are about 130,000 miles on the engine and it is all stock besides the cold air intake, aftermarket coil and plugwires, and a few chrome pieces here and there. How would I check pump volume? the guage only had psi

11-18-2006, 07:12 PM	#9
1979bruiser Registered Member Join Date: Aug 2006 Location: budds creek md Posts: 100	Re: 94 mustang trouble i would try the stock coil, i have had a bad coil in the past that was a aftermarket go bad not long after i got it.

11-20-2006, 09:14 PM	#10
lugthug713 95 GTS 5.0 Join Date: Nov 2006 Location: Shreveport LA Posts: 24	Re: 94 mustang trouble what about teh cat. converters, they could be clogged

11-20-2006, 11:46 PM	#11
friendsmustangprobs Registered Member Join Date: Nov 2006 Posts: 4	Re: 94 mustang trouble 5 month old high flow cats and catback exhaust

11-24-2006, 08:22 PM	#12
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: 94 mustang trouble Has the smog pump been removed? If so the cats will go bad, high flow or not. What RPM is the noticable drop in power? __________________

11-25-2006, 09:28 AM	#13
1979bruiser Registered Member Join Date: Aug 2006 Location: budds creek md Posts: 100	Re: 94 mustang trouble down here in southern md we have no emissions testing so smog pumps cats etc dont exist. whats that??? cant help w/ that part.

11-25-2006, 09:29 AM	#14
1979bruiser Registered Member Join Date: Aug 2006 Location: budds creek md Posts: 100	Re: 94 mustang trouble do you have the stock h-pipee you could try?

11-28-2006, 04:46 PM	#15
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: 94 mustang trouble You said you checked the timing and it was "in specs", What was it at exectly? You checked it with the spout out right? __________________

11-28-2006, 05:01 PM	#16
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: 94 mustang trouble You said you checked the timing and it was "in specs", What was it at exectly? You checked it with the spout out right? __________________

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
I Have an 03 Mustang Gt and Need to beat a 02 Camaro W/LS1 Please Help	Black_03_Mustang_Gt	Classic Mustangs	4	02-03-2006 06:54 PM
I Have an 03 Mustang Gt and Need to beat a 02 Camaro W/LS1 Please Help	Black_03_Mustang_Gt	Windsor Power	2	01-30-2006 05:29 PM
Yellow Mustang Stampede TULSA OK August 17	stylin99	Ford Show & Go	2	11-09-2004 11:19 PM
89-Mustang pulling trailer -vs- 2000 Mustang	Five0	Stang Stories	7	04-01-2001 02:50 AM
Salaeen, Shelby, Cobra please define these for me.	Taqus	Blue Oval Lounge	3	01-17-2001 02:39 AM