Rough Idle
Thread Starter
Racer
Joined: Feb 2003
Posts: 491
Likes: 2
Rough Idle
I have been having the following problems:
the car idles up and down for about 30 sec. on start up (1300-700 rpms) and then idles around 900. Even when the idle is "normal" it still moves between 850-930. But the big problem is that when I use big electrical draw items like AC or headlights and wipers together the idle goes crazy (1500-450) and stalls/almost stalls. The only trouble code I have thrown was low voltage to the EST, but that code hasn't shown up since last summer. Any ideas?
the car idles up and down for about 30 sec. on start up (1300-700 rpms) and then idles around 900. Even when the idle is "normal" it still moves between 850-930. But the big problem is that when I use big electrical draw items like AC or headlights and wipers together the idle goes crazy (1500-450) and stalls/almost stalls. The only trouble code I have thrown was low voltage to the EST, but that code hasn't shown up since last summer. Any ideas?
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Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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Re: Rough Idle (Ray383)
Take apart and clean the IAC, check for vacuum leaks, check the TPS voltage, check the plugs and wires.
Thread Starter
Racer
Joined: Feb 2003
Posts: 491
Likes: 2
Re: Rough Idle (vader86)
Take apart and clean the IAC, check for vacuum leaks, check the TPS voltage, check the plugs and wires.
Race Director
Joined: Oct 2002
Posts: 13,717
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From: RI
Re: Rough Idle (Ray383)
I would check the grounds on the block and on the battery for corrosion issues or looseness. Check for excessive AC ripple voltage with a scope or multimeter, should be no more than 1/2 volt AC.
Kitt
Kitt
Thread Starter
Racer
Joined: Feb 2003
Posts: 491
Likes: 2
Re: Rough Idle (kittmaster)
I would check the grounds on the block and on the battery for corrosion issues or looseness. Check for excessive AC ripple voltage with a scope or multimeter, should be no more than 1/2 volt AC.
Kitt
Kitt
