Mechanics

WHAT CAUSE ENGINE TO RUN LEAN?

1996 Chevrolet Silverado • 222,000 miles

Engine have a misfire at idle in #5 cylinder Spark plug wires, Spark plugs, compression or good #5 Spark plug have white carbon build up on it, this engine have a Throttle Body.
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Joe1953
October 6, 2012.




Missfire comes from, compression, vacuum leak, low fuel pressure, injector issue. All these need to be checked.

Roy

How do I check for vacuum leak.

Tiny
Joe1953
Oct 6, 2012.
Well, you really need a smoke machine, which is not in everybodys toolbox.

You can try spraying a little carb cleaner around the intake where it meets the head and see if the rpm rise or change

Roy

I did spray a little carb cleaner around the upper intake rpm didn't change, what is a smoke machine.

Tiny
Joe1953
Oct 6, 2012.
You should let a shop do this for you. It is an 1200 dollar tool that injects smoke in the system and you can identify the leak with the smoke.

Roy
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About how much it will cost for a shop to identify the leak.

Tiny
Joe1953
Oct 7, 2012.
THIS IS CRUDE--BUT IT WORKS!

http://www.youtube.com/watch?v=zMok2y05jNE

THE MEDIC

CJ MEDEVAC
Oct 7, 2012.
Nice one CJ, but if a Havana is required, it is not to be too cheap, lol.

KHLow2008
Oct 7, 2012.
COULD ALSO BE CONNECTED TO A CERTAIN POLITICIAN

BE CERTAIN YOUR SYSTEM IS CAPABLE OF HANDLING THAT KIND OF PRESSURE

THE MEDIC

CJ MEDEVAC
Oct 7, 2012.
I can't watch the videos do I need to install something on my computer before I can watch the video.

Tiny
Joe1953
Oct 8, 2012.

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