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Old 11-06-2007, 07:20 AM   #1
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95 GMC Jimmy issue

OK, I have been reading here for a bit of the trouble some focus's are having as far as killing when coming into a slow idle or stop, then finding it difficult to start again. My sons Jimmy does this, but it also will stammer like your coming to a stop without putting the clutch in. It does it only after it has warmed up, but it is intermittent. We have cleaned the carbon from the EGR are as well as removed the intake and cleaned it out. I just changed the fuel filter on Saturday, and it seemed to be fine, but then he said it started doing it again on Sunday.

I remember one time when it was doing this, it was in the driveway. It was like it was out of time and had a surge to it and a real different smell than normal from the exhaust. was doing it for a bit, then I heard a "click" from the engine and it began to run fin again.

When it acts up on him, if you put it into neutral and give the foot feed a tap, it will run normal again too.

Does a 95 have a TPS? I have read that on the focus that has been the issue. Had my neighbor, an indy tech and tranny guy. He at first thought torque converter, but its to intermittent to be that. If any one has any ideas, I would be most welcome.

Specifics:
95 S15 Jimmy
4.3l V-6
Auto

TIA,
Ed


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Old 11-06-2007, 10:18 AM   #2
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Yes the GM's have a TPS, that could be part of your problem, but that will also cause problems during acceleration like bucking, lack of response, and backfiring. I think your problem can be solved by removing the IAC and resetting the plunger if your vehicle has one of those IAC valves.

I'm not sure if that's an OBD2 or OBD1 engine- I think the cutoff was 94, but GM is slow on things sometimes especially when it comes to trucks. I think the easiest thing to do is to go by an auto parts place and have someone use a scanner to check the ECU for trouble codes.

PM me, and I'll help you more, but as you can see you aren't going to get many answers in this forum on these kinds of things.
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Old 11-06-2007, 10:48 AM   #3
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tech neighbor is bringing something to test the TPS. We have checked the codes on it and there isnt anything coming up. When it goes to die, it just goes. No check engine light or anything. course all the lights come on when it dies.

IAC, sorry I work with IBM and know most acronyms, but that one has me. And if I recall, 95 body with 97 motor.
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Old 11-06-2007, 12:09 PM   #4
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I believe the 95 uses the newest of the vortec engines, the TBI and CPI 4.3s were ended in 94 IIRC
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Old 11-06-2007, 12:33 PM   #5
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IAC= Idle Air Control, in GM's it's a plunger type valve.

CPI sucked, hard as heck to work on, thank goodness they got rid of it. Not that the later Vortec was easy to work on. If you don't know what you're doing replacing the upper intake gasket- you'll screw it up.
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Old 11-06-2007, 02:21 PM   #6
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the TBI on the other hand, was probably the most durable engine i've ever seen, i've own three, all ran as if they were brand new, after just pugs wires and distributor cap
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Old 11-07-2007, 05:58 AM   #7
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OK, my friend and I checked out the TPS. He said that we should start at .5 volts and go to 5 volts and be able to hold that with engine not running, key in power position. We found that at start we are at .58 volts then as he rotated the throttle it increased to 4.5 then went to open (0.L) . I suspect that I need a new TPS sensor.
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