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Topic: up and down idle

in Forum: C3 Engines

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up and down idle (1/3)
10/30/16 10:15pm

Bags74Vette
Former Member
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Joined: 6/22/2014
Posts: 46

Drove my 82 Crossfire today with no problems. Then all of a sudden when I came to a stop the idle went down to 500 then back to 650. It did this a while. I parked it and when I started it again it was fine. This has happened only once before. Whats going on. Thanks for any suggestions

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Re: up and down idle (2/3)
10/30/16 10:51pm

73shark
Limited Member
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 866

If the throttle bodies have some form of Idle Air Control, then it probably needs cleaning as anything downstream of the throttle blades is subjected to carbon buildup due to intake reversion. First step then is to find the IAC and see if cleaning it helps.

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1973 L-82 4 spd

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Re: up and down idle (3/3)
10/31/16 7:25am

Bags74Vette
Former Member
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Joined: 6/22/2014
Posts: 46

Thanks, I'll try that.

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