4 cylinder V8 ?! - Page 2

PKRWUD · 07-16-2002, 03:30 PM

Sorry, I've been busy for a while. I still think it's an injector problem, but it may be in the wiring.

What year is your cam for? That will determine your firing order.

Take care,
-Chris

USMC302 · 07-16-2002, 04:28 PM

Well, the cam is stock. Is there a way to test the wiring of the injectors, should I see a pulse in the test light? Any self tests I can do? I had a code reader but it wouldn't pull any codes at all. It was a real expensive one from the Mech shop and all it told us was to look up the ford manual for help. The car idles fine, just doesn't have the full 8 yet.

PKRWUD · 07-16-2002, 04:35 PM

The firing order is 1-3-7-2-6-5-4-8.

You're confusing me again. You say it idles fine. If it's only running on 4 cylinders, it shouldn't be idling "fine".

Do you have access to a noid light?

Take care,
-Chris

USMC302 · 07-16-2002, 06:41 PM

I know, but it does, it idles pretty smooth, once you rev it up it pops and backfires too. Yes I can get a noid light, the Mechanic I am working with is my uncle in law if you will and he can get just about any tool I need. I figured since 2 cylinders weren't firing on both sides that it made sense it wasn't vibrating or looking off balance. He swears it is electrical and that we will never figure it out. Yeah you could never tell there was something wrong from idle, but man alive when you try to drive it or rev it it goes to crap. I have a perfectly low 12 second N/A 88 coupe that my uncle wants me to start swapping parts between the two now. Isn't there anything else before resolving to swapping?

PKRWUD · 07-16-2002, 06:44 PM

Before you swap anything, check each injector harness connector with a noid light, and tell me what happens.

Take care,
-Chris

USMC302 · 07-17-2002, 11:54 AM

I read your other post about the regulator being bad, do you think mine is bad with the problems I am having? Could it be overloading the injectors? I mean it does change when adjusted but the BBK FPR's are known to go bad i was told. I will test them with the noid light tomorrow though and let you know. Thanks

USMC302 · 07-22-2002, 07:50 AM

Well, got the noid light, but never got the time to test it this weekend. But made a decision to go ahead and pull the motor,yep, I am going to put the motor out of my Coupe and put it into the GT. The only problems is I bet the GT has an electrical problem rather than a motor problem. I will swap computers and wiring harnesses if I need to but, I figure why put all of this money into this stock engine when I could put the money into the 460 that is sitting in the garage. I am going to put a post in about it taking suggestions about putting into a fox body. All the help you gave is very appreciative and i hope I will be able to narrow the problem down with two stang side by side and let you know what it was for future reference. Thanks again.

PKRWUD · 07-22-2002, 08:12 AM

I still think it's an injector problem, but I agree that it's probably electrical. That's why I wanted you to check with the noid light. I have a hunch that the drivers in the ECM for 1, 2, 6, & 8 may be bad, leaving the injectors open at all times, rather than pulsing them. If the noid light didn't pulse for those injectors, but just stayed lit, then that's what was (is) happening.

Anyway, good luck with your new project.

Take care,
~Chris

USMC302 · 07-22-2002, 10:23 AM

ECM? Computer?

PKRWUD · 07-22-2002, 11:10 AM

Quote:

Originally posted by USMC302
ECM? Computer?

Yes. Sorry about that.

Take care,
~Chris

07-16-2002, 03:30 PM	#21
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Sorry, I've been busy for a while. I still think it's an injector problem, but it may be in the wiring. What year is your cam for? That will determine your firing order. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

07-16-2002, 04:28 PM	#22
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Well, the cam is stock. Is there a way to test the wiring of the injectors, should I see a pulse in the test light? Any self tests I can do? I had a code reader but it wouldn't pull any codes at all. It was a real expensive one from the Mech shop and all it told us was to look up the ford manual for help. The car idles fine, just doesn't have the full 8 yet. __________________

07-16-2002, 04:35 PM	#23
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	The firing order is 1-3-7-2-6-5-4-8. You're confusing me again. You say it idles fine. If it's only running on 4 cylinders, it shouldn't be idling "fine". Do you have access to a noid light? Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

07-16-2002, 06:41 PM	#24
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	I know, but it does, it idles pretty smooth, once you rev it up it pops and backfires too. Yes I can get a noid light, the Mechanic I am working with is my uncle in law if you will and he can get just about any tool I need. I figured since 2 cylinders weren't firing on both sides that it made sense it wasn't vibrating or looking off balance. He swears it is electrical and that we will never figure it out. Yeah you could never tell there was something wrong from idle, but man alive when you try to drive it or rev it it goes to crap. I have a perfectly low 12 second N/A 88 coupe that my uncle wants me to start swapping parts between the two now. Isn't there anything else before resolving to swapping? __________________

07-16-2002, 06:44 PM	#25
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Before you swap anything, check each injector harness connector with a noid light, and tell me what happens. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

07-17-2002, 11:54 AM	#26
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	I read your other post about the regulator being bad, do you think mine is bad with the problems I am having? Could it be overloading the injectors? I mean it does change when adjusted but the BBK FPR's are known to go bad i was told. I will test them with the noid light tomorrow though and let you know. Thanks __________________

07-22-2002, 07:50 AM	#27
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Well, got the noid light, but never got the time to test it this weekend. But made a decision to go ahead and pull the motor,yep, I am going to put the motor out of my Coupe and put it into the GT. The only problems is I bet the GT has an electrical problem rather than a motor problem. I will swap computers and wiring harnesses if I need to but, I figure why put all of this money into this stock engine when I could put the money into the 460 that is sitting in the garage. I am going to put a post in about it taking suggestions about putting into a fox body. All the help you gave is very appreciative and i hope I will be able to narrow the problem down with two stang side by side and let you know what it was for future reference. Thanks again. __________________

07-22-2002, 08:12 AM	#28
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	I still think it's an injector problem, but I agree that it's probably electrical. That's why I wanted you to check with the noid light. I have a hunch that the drivers in the ECM for 1, 2, 6, & 8 may be bad, leaving the injectors open at all times, rather than pulsing them. If the noid light didn't pulse for those injectors, but just stayed lit, then that's what was (is) happening. Anyway, good luck with your new project. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

07-22-2002, 10:23 AM	#29
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	ECM? Computer? __________________

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Rocker adjustment	zach0	Classic Mustangs	3	04-24-2004 12:28 PM
8 cylinder into a 6 cylinder engine bay....?	EclipseGST303	Windsor Power	8	10-04-2002 01:57 PM
8 cylinder into a 6 cylinder engine bay....?	EclipseGST303	Modular Madness	1	10-02-2002 07:31 PM
Master Cylinder	Sneaky	Windsor Power	3	03-06-2002 12:13 PM
4 cylinder to 5.0 conversion	saleen243	Windsor Power	5	02-26-2002 09:45 PM