Idle cycling....
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Elder User
Joined: Jul 2004
Posts: 920
Likes: 0
From: Westminster, Colorado
Idle cycling....
Ijust noticed today that the idle on my truck seems to be fluctuating.....normally it is right around the 900-1000 mark on the tach.....but today i noticed at stoplights and other resting stops, it is going up to about 1400-1500 for about 30 seconds, then going back down to the 900-1000 range for 30 or 40 secs..then again....what is out of adjustment?
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Elder User
Joined: Jul 2004
Posts: 920
Likes: 0
From: Westminster, Colorado
Yeah....Have no AC.....been running smooth and fine for months now......Just had the alt and battery checked because of starter difficulties.
Seems like this happend back over the summer and I just changed out all of the ignition components.....but that can be expensive, so I would like to isolate what couses this and fix that part.
Seems like this happend back over the summer and I just changed out all of the ignition components.....but that can be expensive, so I would like to isolate what couses this and fix that part.
Laughing Gas
Joined: Jan 2002
Posts: 1,008
Likes: 1
From: Tucson
A vacuum leak often leads to high idle. I'd check for that first. Common culprits are: carburetor gaskets, carburetor insulator spacers, intake manifold gaskets, and of course, any of the engine’s vacuum fittings, hoses and accessories.
jor
jor
Senior User
Joined: Jan 2004
Posts: 157
Likes: 0
From: Buckeye, AZ
if you have an automatic, might want to check the modulator valve on the tranny.
I had a high idle problem on a 65 F100 352 with a C6, what a difference with the new valve made!!
I had a high idle problem on a 65 F100 352 with a C6, what a difference with the new valve made!!
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Elder User
Joined: Jul 2004
Posts: 920
Likes: 0
From: Westminster, Colorado
The distributor could be it...it has been in there since i bought the truck and a great deal of my oil leakage seems to come from arount where the dist chaft goes in the engine....perhaps I am feeling the first steps of it wearing out.
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