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Old 12 Sep 2010, 10:15 pm
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Default Rough idle

my car had a rough idle so, i just did a tune up with champion irridium plugs gaped at .040 and new bosch wires, it still idle's rough with a/c on or a/c off.
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Old 13 Sep 2010, 01:51 am
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Default Re: Rough idle

rough idle can mean many things, between computer settings, or fuel management, or injectors, or a TON of other things. have you changed your air filter recently? that could easily also be something to take a look at
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Old 13 Sep 2010, 10:36 am
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Default Re: Rough idle

I had the same issue, i changed the plugs and nothing , did a intake nothing, put new wires on and it fixed it. So only thing left for you would be a air filter
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Old 13 Sep 2010, 11:15 am
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Default Re: Rough idle

i have a cold air intake and the filter is not dirty. lol any other suggestions?
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Old 13 Sep 2010, 11:18 am
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Default Re: Rough idle

change you IAC, Idle Air Control sensor.

if you still have that problem after putting in the new one you may have a leaky intake manifold gasket or throttle body gasket or bad throttle body.

to test the gaskets you need to boost leak test.

to test the throttle body you need to look at the butterfly valve on the throttle body and see if there is any gaps and see if it opens fully.
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Old 13 Sep 2010, 04:07 pm
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Default Re: Rough idle

Fuel pressure could also cause rough idle. Pump going or just a dirty filter sock on the intake. Vacuum leak is also a typical culprit.
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