Question about 1995 Chevrolet Silverado 2500
vacuum leaks on intake manifold,
the air tube between the air filter.
intake manifold vacuum hose.
clean throttle plate with Berryman carburator cleaner
SEE sample picture HERE
Also remove carbon built up behind the EGR valve and the EGR passage tube.
Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.
More un-metered air (leaks) will lean out the fuel mixture.
Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.
At idle,just spray and listen for the RPM surge.
The in-rush of carb clearer will increase the RPM on the motor.
Record the problem spot(s) and address it later.
EGR carbon built up require 2+ hours to clean from start to finish.
You will need a new EGR base gasket before your start.
Locate and remove the EGR valve after the vehicle is cool down.
Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.
Remove the EGR valve.
Inspect the location of the carbon built-up inside the valve and the EGR passage tube.
SOAK these areas with WD-40 spary.
You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.
RE-SOAK the carbon and let it sit for over-night will also help.
One the last round,pass a shop vacuum of the EGR valve and the passage pipe.
Install the new EGR gasket and connectors.
Allow the vehicle to warm up outdoor to burn up any remaining WD-40.
Take it for a test drive.
Please rate my answer if it's useful to you.
Posted on Dec 19, 2009
Testimonial: "I found the ERG valve bad. I sprayed carb cleaner. I didn't hear the engine rev but did notice a bad hose."
Check pcv and egr valves the egr probably carbon-ed up u can unbolt and spray clean with a carb cleaner
Posted on Oct 05, 2009
Testimonial: "I did replace these. The ERG was bad. The PCV questionable but replaced anyway."
Their is a temp sensor on the manifold in front of the throttle body sometimes these will break. check the wire connection. it will cause what you've explained.
Posted on Feb 02, 2010
Check the firing order for your plugs. The correct order is 1-8-4-3-6-5-7-2. Also, you may need to replace your points and condensor they can cause a voltage leakdown which will hinder performance.
Posted on Oct 05, 2009
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Posted on Jan 02, 2017
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