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Topic: Idling issue

in Forum: C3 Engines


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Idling issue

Posted: 5/26/05 5:54pm Message 1 of 6
Silver69
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Joined: 1/26/2004
Posts: 313
I went and replaced my points system with a Pertronix II . The car runs fine but, it will idle up to about 1100RPM once it gets warmed up. The timimg is set to 4 deg BTDC at idle. After letting it sit for a short time and restarting it will idle @ 600-700RPM were it should, but then idle back up after running/driving a while. I've checked the choke and fast idle cam for sticking and they are just fine. Kinda stuck here, any ideas?


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Idling issue

Posted: 5/26/05 6:45pm Message 2 of 6
lost in the 60's
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Newark, CA - USA
Joined: 4/29/2004
Posts: 350
Vette(s): 1969 Corvette 4-speed ZZ-4 crate Monza Red
Are you sure it's not sucking air from somewhere?


Idling issue

Posted: 5/27/05 4:13am Message 3 of 6
knotacare
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Newark, DE - USA
Joined: 7/26/2004
Posts: 468
Vette(s): 1968 Conv, 454HO,500HP-600TQ, TKO-600,3:70 HD rear,hotrod air, custom paint & suspension,1973 Ruby Red,T-top, 383 Stroker, TK)-500,frame off restro, 1967 Dodge Coronet, 340 stroker to 406, Dana 60

What kind of carb do you have? Sounds like gas is leaking inside the carb somewhere. Doesn't take much of a leak to raise the idle.

Alan




                                               

Idling issue

Posted: 5/27/05 5:31am Message 4 of 6
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kstyer
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
Put a timing light on the car and see if the timing changes when the idle raises.  Advanced timing will cause the speed increase.  


Idling issue

Posted: 5/27/05 11:39am Message 5 of 6
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cthulhu
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans

im thinking vacuum leak as well...  they have a tendency to cycle like this..

 




Idling issue

Posted: 5/31/05 10:52am Message 6 of 6
After Shark
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Portland, TN - USA
Joined: 4/29/2003
Posts: 805
Vette(s): 1972 Coupe Anything, but Stock and more mods to come! SSBC Force 10 Brakes, 3.73, TH350, 355 CID, Rack and Pinion, Vette Brakes suspension front and rear.
I don't know.  If it wasn't doing it before the pertronix then I would suspect the problem lies with the new ignition piece.  I'm memory serves correctly the pertronix II has a built in timing computer and that may be causing it to flucuate.


in Forum: C3 Engines


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