Need Help?

silverponyracin · 07-10-2008, 01:56 PM

I Have a 89 coupe with a 347. The car had a engine bay fire a few weeks ago I replaced the fuel rail,injector harness,maf, & the injectors the main harness did not get hurt thank god. Now when I fire up the car the headers on the passenger side are geting red hot & the drivers side is cool as can be. It is running real ruff poping & missing does not want to go over 3000RPM & after it ideals for 30 seconds the car shuts down like I turned the key off. Has anyone seen this before any tech help would be great

Hitman84 · 07-10-2008, 05:08 PM

the header glows red after running for only 30 seconds?

silverponyracin · 07-10-2008, 05:29 PM

That takes about 50-90 sec's.

BHAM · 07-11-2008, 12:39 AM

lets try another injector harness... i have one ill give ya

silverponyracin · 07-11-2008, 07:30 AM

I pulled the regulator apart last nite. The diaphram was melted I think that mite have been the problem.

whitey92lx · 07-11-2008, 10:54 PM

def. a fuel issue. I hope you get it fixed!

silverponyracin · 07-11-2008, 11:28 PM

Thanks. I'm looking for a regulator I hope that does the trick.

silverponyracin · 07-18-2008, 09:42 PM

Well I changed the regulator & it idelas a little better but still does not want to go past 3500 with my foot to the floor & when I let off & it pop's it still is geting hot on the passenger side just not as bad timing is at 14 fuel press. is at 44psi. Please any one have any ideas?

**Sonic Blue 85** · 07-19-2008, 09:43 AM

Does this car have cats? If so maybe one or more of the right side cats is plugged. What has been replaced, such as electronics and where did you get those parts? You might try disconnecting the right side injectors one by one or possibly two at a time. Have the injectors or ECU been replaced? Neither one likes heat, also when you melt wiring you create shorts between the wires in the harness that were burned, those shorts can damage parts that were not in the fire such as the ECU. Also make sure the O2s are hooked up properly, make sure you do not have the left and right swapped. This should not be a problem, because the ECU is not suppose to use the O2s until it goes into closed loop, which will take longer than 30 seconds to get into when the car is cold.

**Sonic Blue 85** · 07-19-2008, 09:52 AM

Some more things to look at, you say the fuel pressure is at 44 psi. Is that with the vacuum line hooked up or disconnected and do you have an adjustable regulator? Your fuel pressure should be around 38 with the vacuum line disconnected and high 20s to mid 30s with the line hoooked up, the more vacuum the lower the fuel pressure will be. So if the car has a stock cam and was in good condition it should pull close to 20 in. of vacuum, that much vacuum cam drop the fuel pressure into the mid to high 20s. Check the vacuum make sure you do not have any vacuum leaks just to be sure. Melted vacuum lines are very common in engine fires. How much of the engine compartment was on fire and where was the fire?

**thesource** · 07-19-2008, 10:03 AM

Engine fires are always fun to clean up . I bet you shorted something out or burned up a vaccum line . Just take your time and go over everything very closely .

silverponyracin · 07-19-2008, 12:35 PM

The car does not have cats on it I replaced injector harness,aeromotive regulator, 30injectors, 75mmpro m, The passenger side is what caught on fire. The motor is a 13.1 347 with a 613 soild lift cam gt40 x heads fully ported it has a in line pump.

**Sonic Blue 85** · 07-19-2008, 03:12 PM

Only 30# injectors? I would have expected 36# to 42# injectors. I gess you know the vacuum is going to be closer to 8 in. vacuum. Is there a chip on the computer? I would bet you have a problem with the ECU as a result of the engine harness having shorts.

silverponyracin · 07-19-2008, 03:22 PM

No chip in it.

**Sonic Blue 85** · 07-19-2008, 05:45 PM

So have you replaced the computer since the fire or tried another one? If you have a noid light, plug it into each of the injector connectors while the car is running. It should flash very quickly, it should not be on continuously or not at all. You can use a test light connected between the two terminals if you do not have a noid light. Some auto parts stores sell noid lights, they are easier to use than trying to rig a test light.

silverponyracin · 07-19-2008, 08:37 PM

NoI have not replaced the computer I just replaced the injector harness I dont have another one to try. I will test the Injector tommrow

silverponyracin · 07-21-2008, 08:21 PM

Well I replaced ecm harness & computer & she lives. Thanks everyone for there input.

**Sonic Blue 85** · 07-22-2008, 08:10 PM

So what does that thing run and what are you running for heads and intake? You don't see 347s running 13:1 cr very often.

silverponyracin · 07-22-2008, 10:24 PM

The car was set up to street race back in california it has a set gt40x fully ported & the stock intake was cut in half ported like crazy then welded back together & powder coated to look stock. The motor looks rock stock except for the T.B & injectors. Ran the car 1 time on drag radials the car spun real hard in 1-3 gears to a 12.5 going to little river this friday to try it agian on slick this time.

**Sonic Blue 85** · 07-23-2008, 11:09 AM

Not bad, I thought the car was near stock, looking at the picture. You should get some low 12s out of it. So what was the mph.

07-10-2008, 01:56 PM	#1
silverponyracin Registered User Join Date: May 2008 Location: Taylor, TX Posts: 54 Trader Rating: (1)	Car Dont Want To Go Past 3500RPM Need Help? I Have a 89 coupe with a 347. The car had a engine bay fire a few weeks ago I replaced the fuel rail,injector harness,maf, & the injectors the main harness did not get hurt thank god. Now when I fire up the car the headers on the passenger side are geting red hot & the drivers side is cool as can be. It is running real ruff poping & missing does not want to go over 3000RPM & after it ideals for 30 seconds the car shuts down like I turned the key off. Has anyone seen this before any tech help would be great Last edited by silverponyracin; 07-18-2008 at 09:44 PM.

07-10-2008, 05:08 PM	#2
Hitman84 Registered User Join Date: Mar 2008 Location: Galveston County Posts: 98 Trader Rating: (1)	the header glows red after running for only 30 seconds? __________________ '84 fox convertible. E7 roller block .030 over with Hyper. pistons and stock stroke for now. E7 heads, Weiand Stealth intake, holley 4777, comp cams magnum 290 cam and springs, and complete MSD ignition. MAC equal length shorty headers to BBK O/R X-pipe to dual chamber flows. Electric fan conversion. '92 silver ponys. Just added, UPR non adjustable upper and lower control arms, Eiback Pro drop springs, MGW short throw shifter, billet overflow tank, and a few other billet accessories.

07-11-2008, 10:54 PM	#6
whitey92lx Registered User Join Date: Jul 2008 Location: hockley Posts: 31 Trader Rating: (0)	def. a fuel issue. I hope you get it fixed! __________________ http://westsidemustangs.com

07-19-2008, 09:43 AM	#9
Sonic Blue 85 LSS Sponsor Join Date: Dec 2007 Location: New Braunfels Posts: 286 Trader Rating: (1)	Does this car have cats? If so maybe one or more of the right side cats is plugged. What has been replaced, such as electronics and where did you get those parts? You might try disconnecting the right side injectors one by one or possibly two at a time. Have the injectors or ECU been replaced? Neither one likes heat, also when you melt wiring you create shorts between the wires in the harness that were burned, those shorts can damage parts that were not in the fire such as the ECU. Also make sure the O2s are hooked up properly, make sure you do not have the left and right swapped. This should not be a problem, because the ECU is not suppose to use the O2s until it goes into closed loop, which will take longer than 30 seconds to get into when the car is cold. __________________ My car is an '85 sonic blue coupe with 302 bored and stroked to 364, Ported Twisted Wedge heads and a BXR intake, A9M ECM with a Tweecer, C4 with trans brake, Hoosier 275/60/15 drag radials, no power adders. The car is still street driven, with a best of 10.21 at 131 mph with a 1.51 60' spinning lightly off the line. With this combo it made a best of 460 hp and 410 lbs of torque at the wheels.

07-19-2008, 09:52 AM	#10
Sonic Blue 85 LSS Sponsor Join Date: Dec 2007 Location: New Braunfels Posts: 286 Trader Rating: (1)	Some more things to look at, you say the fuel pressure is at 44 psi. Is that with the vacuum line hooked up or disconnected and do you have an adjustable regulator? Your fuel pressure should be around 38 with the vacuum line disconnected and high 20s to mid 30s with the line hoooked up, the more vacuum the lower the fuel pressure will be. So if the car has a stock cam and was in good condition it should pull close to 20 in. of vacuum, that much vacuum cam drop the fuel pressure into the mid to high 20s. Check the vacuum make sure you do not have any vacuum leaks just to be sure. Melted vacuum lines are very common in engine fires. How much of the engine compartment was on fire and where was the fire? __________________ My car is an '85 sonic blue coupe with 302 bored and stroked to 364, Ported Twisted Wedge heads and a BXR intake, A9M ECM with a Tweecer, C4 with trans brake, Hoosier 275/60/15 drag radials, no power adders. The car is still street driven, with a best of 10.21 at 131 mph with a 1.51 60' spinning lightly off the line. With this combo it made a best of 460 hp and 410 lbs of torque at the wheels.

07-10-2008, 05:29 PM	#3
silverponyracin Registered User Join Date: May 2008 Location: Taylor, TX Posts: 54 Trader Rating: (1)	That takes about 50-90 sec's.

07-11-2008, 12:39 AM	#4
BHAM Registered User Join Date: Nov 2005 Location: paige tx Posts: 805 Trader Rating: (6)	lets try another injector harness... i have one ill give ya

07-11-2008, 07:30 AM	#5
silverponyracin Registered User Join Date: May 2008 Location: Taylor, TX Posts: 54 Trader Rating: (1)	I pulled the regulator apart last nite. The diaphram was melted I think that mite have been the problem.

07-11-2008, 11:28 PM	#7
silverponyracin Registered User Join Date: May 2008 Location: Taylor, TX Posts: 54 Trader Rating: (1)	Thanks. I'm looking for a regulator I hope that does the trick.

07-18-2008, 09:42 PM	#8
silverponyracin Registered User Join Date: May 2008 Location: Taylor, TX Posts: 54 Trader Rating: (1)	Well I changed the regulator & it idelas a little better but still does not want to go past 3500 with my foot to the floor & when I let off & it pop's it still is geting hot on the passenger side just not as bad timing is at 14 fuel press. is at 44psi. Please any one have any ideas?

07-19-2008, 10:03 AM	#11
thesource LSS Sponsor Join Date: Nov 2004 Location: in a hole building transmissions Posts: 3,137 Trader Rating: (12)	Engine fires are always fun to clean up . I bet you shorted something out or burned up a vaccum line . Just take your time and go over everything very closely . __________________ Texas Motorsports Myspace Texas Motorsports Photobucket

07-19-2008, 12:35 PM	#12
silverponyracin Registered User Join Date: May 2008 Location: Taylor, TX Posts: 54 Trader Rating: (1)	The car does not have cats on it I replaced injector harness,aeromotive regulator, 30injectors, 75mmpro m, The passenger side is what caught on fire. The motor is a 13.1 347 with a 613 soild lift cam gt40 x heads fully ported it has a in line pump.

07-19-2008, 03:12 PM	#13
Sonic Blue 85 LSS Sponsor Join Date: Dec 2007 Location: New Braunfels Posts: 286 Trader Rating: (1)	Only 30# injectors? I would have expected 36# to 42# injectors. I gess you know the vacuum is going to be closer to 8 in. vacuum. Is there a chip on the computer? I would bet you have a problem with the ECU as a result of the engine harness having shorts. __________________ My car is an '85 sonic blue coupe with 302 bored and stroked to 364, Ported Twisted Wedge heads and a BXR intake, A9M ECM with a Tweecer, C4 with trans brake, Hoosier 275/60/15 drag radials, no power adders. The car is still street driven, with a best of 10.21 at 131 mph with a 1.51 60' spinning lightly off the line. With this combo it made a best of 460 hp and 410 lbs of torque at the wheels.

07-19-2008, 03:22 PM	#14
silverponyracin Registered User Join Date: May 2008 Location: Taylor, TX Posts: 54 Trader Rating: (1)	No chip in it.

07-19-2008, 05:45 PM	#15
Sonic Blue 85 LSS Sponsor Join Date: Dec 2007 Location: New Braunfels Posts: 286 Trader Rating: (1)	So have you replaced the computer since the fire or tried another one? If you have a noid light, plug it into each of the injector connectors while the car is running. It should flash very quickly, it should not be on continuously or not at all. You can use a test light connected between the two terminals if you do not have a noid light. Some auto parts stores sell noid lights, they are easier to use than trying to rig a test light. __________________ My car is an '85 sonic blue coupe with 302 bored and stroked to 364, Ported Twisted Wedge heads and a BXR intake, A9M ECM with a Tweecer, C4 with trans brake, Hoosier 275/60/15 drag radials, no power adders. The car is still street driven, with a best of 10.21 at 131 mph with a 1.51 60' spinning lightly off the line. With this combo it made a best of 460 hp and 410 lbs of torque at the wheels.

Thread Tools
Show Printable Version Email this Page
Display Modes	Rate This Thread
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode	Rate This Thread:

07-19-2008, 08:37 PM	#16
silverponyracin Registered User Join Date: May 2008 Location: Taylor, TX Posts: 54 Trader Rating: (1)	NoI have not replaced the computer I just replaced the injector harness I dont have another one to try. I will test the Injector tommrow

07-21-2008, 08:21 PM	#17
silverponyracin Registered User Join Date: May 2008 Location: Taylor, TX Posts: 54 Trader Rating: (1)	Well I replaced ecm harness & computer & she lives. Thanks everyone for there input.

07-22-2008, 08:10 PM	#18
Sonic Blue 85 LSS Sponsor Join Date: Dec 2007 Location: New Braunfels Posts: 286 Trader Rating: (1)	So what does that thing run and what are you running for heads and intake? You don't see 347s running 13:1 cr very often. __________________ My car is an '85 sonic blue coupe with 302 bored and stroked to 364, Ported Twisted Wedge heads and a BXR intake, A9M ECM with a Tweecer, C4 with trans brake, Hoosier 275/60/15 drag radials, no power adders. The car is still street driven, with a best of 10.21 at 131 mph with a 1.51 60' spinning lightly off the line. With this combo it made a best of 460 hp and 410 lbs of torque at the wheels.

07-22-2008, 10:24 PM	#19
silverponyracin Registered User Join Date: May 2008 Location: Taylor, TX Posts: 54 Trader Rating: (1)	The car was set up to street race back in california it has a set gt40x fully ported & the stock intake was cut in half ported like crazy then welded back together & powder coated to look stock. The motor looks rock stock except for the T.B & injectors. Ran the car 1 time on drag radials the car spun real hard in 1-3 gears to a 12.5 going to little river this friday to try it agian on slick this time.

07-23-2008, 11:09 AM	#20
Sonic Blue 85 LSS Sponsor Join Date: Dec 2007 Location: New Braunfels Posts: 286 Trader Rating: (1)	Not bad, I thought the car was near stock, looking at the picture. You should get some low 12s out of it. So what was the mph. __________________ My car is an '85 sonic blue coupe with 302 bored and stroked to 364, Ported Twisted Wedge heads and a BXR intake, A9M ECM with a Tweecer, C4 with trans brake, Hoosier 275/60/15 drag radials, no power adders. The car is still street driven, with a best of 10.21 at 131 mph with a 1.51 60' spinning lightly off the line. With this combo it made a best of 460 hp and 410 lbs of torque at the wheels.