Question about 1995 GMC Jimmy

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I have a 95 Jimmy 4.3 4x4. It started bucking when I let off the gas. My mechanic said it was losing approx. 8% pressure and replaced the fuel pump. It didn't solve the problem. Now he wants to replace the timing chain which he said is a 7 -8 hour job and big bucks. Does this sound right? He did a diagnostic test which didn't show anything. Would bad injectors show on diagnostics? What would be the proper process to eliminate possibilities before I keep spending money

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If this bucking occurs at an idle it is the egr

Posted on Feb 07, 2009

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The 1995 Vortec are bad for bad carbon deposit in the EGR Valve. Remove it and clean it with carb cleaner or injector cleaner from a can, spray the carbon away then spray some silicon lubeacator from a can before re installing it. Good luck oh and check your vacum lines before you get your hands too dirty.

Posted on Apr 05, 2009

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Egr or mass air flow or last but not least map sensor

Posted on Mar 12, 2009

  • Riggs Garcia Mar 12, 2009

    ps timing my %%s you do know timing chains are good for the life of a car if you not running high compression tell him thanks and go to a different shop ps if he was any good he would of figured it out

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To see if it is the EGR Vallve remove it clean it out and reinstall it it should only take you about Half hour

Posted on Feb 16, 2009

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I had the same problem; it could be one of two things: First check the Enhanced Distributor Ignition Systems (EDI) a simple check. If that's not the problem then remove the intake manifold. Check both the presure and return fuel lines under the manifold. More than likely they have rubbed together creating a fuel leak.

Posted on Feb 01, 2009

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It will not be the timing chain.Is check emgine light on?I would try another shop to scan computer.

Posted on Jan 21, 2009

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1 Answer

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the battery indicator light usually comes on after a lose of power. Sounds to me like either bad gas, clogged fuel filter or a bad fuel pump. Easiest way to check this is have someone turn the key while you stand at rear side of vehicle and listen for the whinning noise a functioning fuel pump makes as it pressurizes the system.

P.S you dont have to start vehicle to check pump. only requires turning the key to the on position. Good Luck

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Hi, back again. Changed the fuel filter and a new


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