| Problem Diagnosis Got a problem you can't fix? Post here and one of our members will answer as soon as possible. |
11-05-2009, 09:07 PM
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#31
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AF Enthusiast
Join Date: Aug 2004
Location: westminster, Maryland
Posts: 649
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Re: 95 engine issues
tried seafoam. no luck.
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95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler split rear., 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.
71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.  
90 cav, 2.2 tbi, gas getter.
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11-06-2009, 02:23 AM
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#32
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AF Enthusiast
Join Date: Feb 2009
Location: Columbus, Ohio
Posts: 508
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Re: 95 engine issues
I don't mean to knock seafoam, but that could be more of a problem than a fix. I think you should try a dedicated fuel system/injector cleaner like Techron/ProGard. sometimes even that won't get injectors clean and they need cleaner ran directly through. Anyway maybe the Seafoam works OK as an injector cleaner and that's not the problem.
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11-08-2009, 11:12 PM
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#33
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AF Enthusiast
Join Date: Aug 2004
Location: westminster, Maryland
Posts: 649
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Re: 95 engine issues
replaced egr valve. no change.
__________________
95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler split rear., 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.
71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.
90 cav, 2.2 tbi, gas getter.
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11-10-2009, 11:06 PM
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#34
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AF Enthusiast
Join Date: Aug 2004
Location: westminster, Maryland
Posts: 649
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Re: 95 engine issues
could it be a timing chain issue? whats the easiest way to check?
__________________
95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler split rear., 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.
71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.
90 cav, 2.2 tbi, gas getter.
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11-11-2009, 02:41 AM
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#35
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AF Enthusiast
Join Date: Feb 2009
Location: Columbus, Ohio
Posts: 508
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Re: 95 engine issues
Quote:
Originally Posted by metallica21156
could it be a timing chain issue? whats the easiest way to check?
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Have you checked compression? that could tell you a lot like late ignition valve timing (timing chain), rings seal, etc. A vaccuum guage can help too. I still think clogged up fuel injector is a possibilty.
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11-11-2009, 08:03 PM
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#36
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AF Enthusiast
Join Date: Aug 2004
Location: westminster, Maryland
Posts: 649
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Re: 95 engine issues
no i haven't. well today i went to start the truck. started right up and rpms went to 1400 and then stayed there and then started moving up and down +/- 200rpms. left engine running. grabbed scanner. it said the tps voltage was .68 volts but it said throttle % was 3. turned off truck. waited 10 seconds. restarted and then all was back to normal. tps voltage was .68 and 0% throttle. turned off engine. turned key back on to check map sensor and it just stayed at 1.72 volts. started engine, revved motor and saw it jump up to somewhere around 3 volts. killed engine and rechecked and it was reading 4.some volts like it should. timing when engine saw 3% throttle it was 32 degrees. when everything was working correctly it was at 12-18 and moving around. the other day i swapped the egr valve when i plugged it in the computer said it was calling for it to be open 11% and the actual egr was open 8%. i looked at the valve and it wasn't open at all. i didn't have it installed yet. tried turning on and off no luck. pulled ecm fuse for 5 mins. put back in and everything returned to normal. any ideas whats making this thing screw up?
__________________
95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler split rear., 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.
71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.
90 cav, 2.2 tbi, gas getter.
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11-11-2009, 08:38 PM
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#37
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AF Enthusiast
Join Date: Feb 2009
Location: Columbus, Ohio
Posts: 508
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Re: 95 engine issues
I don't know, maybe your ECM has some kind of problem or maybe you have scanner problems, but you say it really does runs bad. Hard to say. Maybe someone else here has an idea. It's hard to imagine that your TPS and MAP both were bad then suddenly fixed themselves unless there was a wiring problem or ECM problem, or scanner problem. Maybe check the reference 5V at those sensors? Does this 95 have that OBD1.5 with an OBD II diagnostic connecter and flash eeprom but OBD I software?
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11-11-2009, 08:47 PM
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#38
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AF Enthusiast
Join Date: Aug 2004
Location: westminster, Maryland
Posts: 649
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Re: 95 engine issues
its obd2. ecm is on the coolant bottle. im gonna try switching the ecms tomorrow again.
__________________
95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler split rear., 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.
71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.
90 cav, 2.2 tbi, gas getter.
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11-12-2009, 06:57 PM
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#39
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AF Enthusiast
Join Date: Aug 2004
Location: westminster, Maryland
Posts: 649
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Re: 95 engine issues
got home to late. didnt get a chance to switch ecms. would i choppy idle tell anything? also i've noticed that when its warm and i come to a stop the idle goes up and down like the a/c compressor is kicking on. i know for a fact it isnt. only does it in drive.
__________________
95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler split rear., 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.
71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.
90 cav, 2.2 tbi, gas getter.
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11-12-2009, 07:45 PM
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#40
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AF Enthusiast
Join Date: Aug 2004
Location: westminster, Maryland
Posts: 649
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Re: 95 engine issues
went outside with a light. switched emcs. no change. would a weak ground cause any of this? i measured from ground post on battery to different places on the engine. the best i could get was 107 ohms. any ideas?
__________________
95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler split rear., 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.
71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.
90 cav, 2.2 tbi, gas getter.
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11-12-2009, 08:55 PM
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#41
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Advisor/Moderator
Join Date: Nov 2005
Location: Belleville, Michigan
Posts: 3,157
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Re: 95 engine issues
From the ground terminal at the battery to any good ground on the vehicle, resistance should be no more than 5 ohms.
__________________
The global warming agenda has never been about science or health or human life. The global warming agenda is about stripping us of our freedom and redistributing our wealth. The only things truly endangered are our rights.
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11-12-2009, 09:03 PM
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#42
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AF Enthusiast
Join Date: Aug 2004
Location: westminster, Maryland
Posts: 649
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Re: 95 engine issues
so could that be my issue? computer is seeing 14.4 volts.
__________________
95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler split rear., 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.
71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.
90 cav, 2.2 tbi, gas getter.
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11-12-2009, 09:14 PM
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#43
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Advisor/Moderator
Join Date: Nov 2005
Location: Belleville, Michigan
Posts: 3,157
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Re: 95 engine issues
ECM is seeing 14.4 volts, but is the ECM and the vehicle body seeing a good ground? Check resistance from the ECM ground pin to the negative battery terminal, should be less than 5 ohms. You might have a problem with the body ground, it attaches to the rear of the right cylinder head, or at the ground cable connection from the battery to the engine block.
__________________
The global warming agenda has never been about science or health or human life. The global warming agenda is about stripping us of our freedom and redistributing our wealth. The only things truly endangered are our rights.
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11-12-2009, 09:23 PM
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#44
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AF Enthusiast
Join Date: Feb 2009
Location: Columbus, Ohio
Posts: 508
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Re: 95 engine issues
I was just curious. How were able to swap PCMs on an OBDII with theftdeterent. Didn't you have to reflash the PCM? Its looking like you have wiring/ground problems like old master mentioned. You could still have a mechanicl issue or cloggy injector problems though once you get the electrical sorted out.
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11-12-2009, 10:10 PM
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#45
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AF Enthusiast
Join Date: Aug 2004
Location: westminster, Maryland
Posts: 649
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Re: 95 engine issues
theftdeterent? never heard of it. truck runs fine with it.
__________________
95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler split rear., 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.
71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.
90 cav, 2.2 tbi, gas getter.
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