4.3 Stumbling at mid to hi rev - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 05-15-2001, 11:15 AM
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4.3 Stumbling at mid to hi rev

Got a 91 S10 4x4 4.3liter auto that stumbles at mid to high revs. With a timming light the timing can be seen retarding 10-15 deg when the problem kicks up. Taking it down the road is just about inposssible, it starts to booge down with no power. Fuel filter was changed, has a new dist cap/rotor, tried new spark contol module, new knock sensor, looks like fuels pouring good during the act, timing is stable at idle. Could the timing chain be the culprit?
Second engine with 100k on it, 3rd tranny, rebuilt transfercase.

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post #2 of (permalink) Old 05-15-2001, 01:29 PM
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Re: 4.3 Stumbling at mid to hi rev

Bringin it back to the top.
Forgot to mention it has tbi and no trouble codes.

post #3 of (permalink) Old 05-15-2001, 04:05 PM
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Re: 4.3 Stumbling at mid to hi rev

<font face="Comic Sans MS">Check the fuel pump then, have the volume tested to make sure it flows enough still. Make sure you have the proper grade fuel... These engines should have a knock sensor that will retard the timing if it senses detonation, knock, etc... [img]/wwwthreads_images/icons/crazy.gif[/img] Just a few thoughts... [img]/wwwthreads_images/icons/crazy.gif[/img]</font>

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post #4 of (permalink) Old 05-22-2001, 12:48 AM
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Re: 4.3 Stumbling at mid to hi rev

I replaced a fuel filter in a full size the new one turned out to be faulty - just a thought.


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