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06-09-2019, 04:13 AM #1
- Join Date
- Oct 2005
- Location
- Vicksburg. Ms.
- Posts
- 461
pewter- 99 Trans Am
my 69 chevy truck I believe have a intake sucking air.
I have a 69 Chevy truck that will not idle unless it is set higher than needed The plugs on all but about three of the cylinders are covered with a black power like covering when driven at normal speed but will clean up if driven at high speed. I have replaced the carb with the one off my Camaro that I know is good but it does the same thing. I checked the compression and all are good I rechecked the timing to make sure it was not too high, I have done a vacuum check at idle it shows about 15 and goes to about 25 when I open the throttle. The engine is a 350 with a comp cam with a 501-501 lift that have a ruff idle, with
vortec heads and a Edelbrock Rpm intake. I have run this setup for sometime and have never had this issue, intake sucking air?or burnt valves? I have changed the dist. cap and wires from the Camaro but the same.?The compression test showed the highest was 170 and the lowest was 140.Last edited by Street Fighter; 06-09-2019 at 04:23 AM.
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06-11-2019, 06:19 AM #2
- Join Date
- Feb 2009
- Location
- Florida Man Status Acheivement
- Posts
- 11,758
Navy Blue Metallic- 98 T/A w/ mods, 00 FBVert
Have you checked the pcv?
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06-12-2019, 10:31 AM #3
- Join Date
- Oct 2005
- Location
- Vicksburg. Ms.
- Posts
- 461
pewter- 99 Trans Am
NO everything but the simple stuff, will do so today thinks I hope that's the cause.
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