2000 Pontiac Sunfire Rough Idle, Quiting, And Starting Up Once Cooled Off - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-13-2008, 06:30 PM
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2000 Pontiac Sunfire Rough Idle, Quiting, And Starting Up Once Cooled Off

Hello, I just purchased a 2000 Pontiac Sunfire, and I bought it as a ifxer upper, as it was running rough, I found out that there was no screw on gas cap, I took one from another sunfire, and put on, I also found out that where the plastic intake goes onto the throttle body, wasnt connected, at all. I fixed that as well, and It seemed to run all right, much better than when I frist got it home. Them on my way home with it tonight, I filled up with gas, got about 20 miles, and it quit, It started right back up, and I went on, got about 2 more miles, quit again, wouldnt start right back up, so I just sat there for a while. after about 5 minutes, it started back up, got about 10 more miles, did the same thing, cooled off for a while, and started again, and did this same thing 2 more times. Also, the check engine light has been on since I purchased it. Thanks, any help would be greatly appreciated! Thanks

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Old 04-13-2008, 06:47 PM
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I worked on one once that had a code (for what I don't recall), and it turned out to be the crank sensor. Every time it came in on the tow truck it would start right up and run forever. I finally applied heat to the sensor in hand and watched it quit working when hot, on my test equipment. Get the check engine light checked to see what code it's setting. If it turns out to be the crank sensor get one from the dealer. Aftermarket parts just don't work as well on these.
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Old 04-13-2008, 07:35 PM
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Quote:
on my test equipment.
carsavvycook, what kind of test set-up did you use for this?
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Old 04-13-2008, 07:54 PM
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Quote:
Originally Posted by scrot
carsavvycook, what kind of test set-up did you use for this?
My Snap-on Vantage meter. But I think you could hook up a volt/ohm meter to it and check it's ohms cold, then apply heat from a heat gun(hair dryer if you don't have a heat gun) and watch to see if it looses it's ohms.
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Old 04-13-2008, 08:14 PM
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Well, I do know, that when it is cooling off, right after dying, Im not sure if it is just the motor cooling off, but towards the center of the engine compartment, I can hear noises, that sound like a circuit breaker flipping.
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Old 04-13-2008, 08:24 PM
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Most likely the exhaust manifold/pipe cooling down.
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Old 04-13-2008, 08:25 PM
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Is it possible, that it is the coil causing it to do this? I mean, it gives absolutely NO sign of quiting, just like a circuit breaker or something was tripped, it doesnt cut out or anything before quiting.
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Old 04-13-2008, 08:35 PM
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Quote:
Originally Posted by jordan2011
Is it possible, that it is the coil causing it to do this? I mean, it gives absolutely NO sign of quiting, just like a circuit breaker or something was tripped, it doesnt cut out or anything before quiting.
Does this not have a coil pack the 4 plug wires plug into? 2.2 or 2.4? I'll post the actual ohm reading spec.
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Old 04-13-2008, 08:39 PM
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Yes, i am pretty sure that it has one that all 4 plug wires plug into, and it is a 2.2
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Old 04-13-2008, 08:51 PM
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OK here goes: The Crank Sensor is a magnetic pulse generator that produces an AC signal. The ignition module uses the CKP(for short) signal to determine crankshaft rotation and synchronize coil firing sequence. It is a 7x=(6+1)/360 signal.

It is located at the rear center of the engine above the oil pan.(real close to the exhaust pipe coming out of the exhaust manifold.

Resistance should be cold 500ohms to 900ohms.
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Old 04-13-2008, 08:55 PM
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I have a whole other 2.2 that is in a cavalier, so I might just experiment, with switching out a few of these parts, and see if this helps. and thanks for the information, I was told that It could be either a relay getting hot, or the coil pack, what do you think? thanks
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Old 04-13-2008, 08:58 PM
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Crank sensor! I wish she would come back to let me check HER car over some more, sooner than later.
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Old 04-13-2008, 08:59 PM
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Would the crank sensor make the car idle roughly, but seem to sun fine while driving?
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Old 04-13-2008, 09:02 PM
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I also have a relay tester that found no problem with the relay at all. A coil pack will quit firing one or two holes before it quits all together. Does this make any sense?
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Old 04-13-2008, 09:05 PM
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Yes, it makes sense, I was just wondering if the crank sensor on hers, made the car idle roughly, but seem fine while driving, until dyeing unexpectedly
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