Question about 1995 Chevrolet Silverado 2500

4 Answers

I have a 1995 chevy p/u 5.7 4x4 that is running rough. I have replaced the air filter, fuel filter, plugs, wires, cap and rotor. I have run a couple of bottles of injector cleaner through the gas and it still runs rough. It cranks quite a few times before starting and will die very ofter until it warms up then it is better. When i step on it it has little power and sputters and i have to pump it to get it to take off. Any suggestions?

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  • Chevrolet Master
  • 2,359 Answers

Check for

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.


Cheers,

Mustgo

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."

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  • Chevrolet Master
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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."

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  • Contributor
  • 2 Answers

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

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  • Master
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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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