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Old 07-02-2010, 10:24 AM
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2.8 v6 rough running

Have a 88 camaro 2.8 v6. Just replaced spark plugs and wires and have a new engine vacuum solenoid, after new plugs and wires car crunk and idled smoothly for a few minutes then went back into running rough. Car sat for over a year and ran well before it was parked,now trying to put back on road. Any help is appreciated.

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Old 07-02-2010, 01:08 PM
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Sounds almost like it runs good when in open-loop. Open-loop is logic used to run the engine with little/no inputs from various sensors.

Once it warms up a little it will go into closed-loop. That means the computer will use information from various sensors to run the engine.

It would seem possible that one of the sensors is skewd and not giving correct info to computer during closed-loop operation. I've had O2 sensors do this. But thats a BIG guess without doing any actual tests, or checking the basics. Just had a car with a single wire O2 that was bad. But it actually turned out to be the computer's opamp was defective, telling the O2 to read wrong. So bad computer there...Fun Good luck
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Old 07-03-2010, 03:44 PM
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Could a bad pick up coil cause it? Could the o2 sensor be messed up by havin a bad egr valve?
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Old 07-03-2010, 07:20 PM
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Quote:
Originally Posted by dragonxdynasty
Could a bad pick up coil cause it? Could the o2 sensor be messed up by havin a bad egr valve?
Best place to start is to retreive the codes from the ECM.
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