Question about 1991 Chevrolet C1500

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I have 95 silverado 5.7 rebuilt motor it starts good runs good

But when put under a load it spits and backfires can feather gas but lacks power acts like not enuff fuel

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  • llcarpentryd Dec 09, 2008

    WENT THROUGH everything runs awsome dont move without feathering pedal cant stomp on pedal without acting like its flooding fuel pump runs 2-3 min after shutdown sometimes just replaced fuelpump,filter 2 years ago do i still need to look there

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You are not getting enough of one or more of the following;
1. Fuel 2. Air 3. Spark 4. Vacuum
See possible causes and fixes below 1. Fuel -If carburated, may need to be rebuilt, no way to tell w/o dissassembly and looking at valves/jets -If fuel injected, injectors could be dirty or malfunctioning, are they old? 
Q -  does engine run smooth at any speed? If not, not all cylinders may be firing
2.  Air - is air filter clean? Is there debris in air box?
3. Spark - does engine sound like all cylinders firing? If so, spark should be fine. But have you checked plugs recently? Changing all plugs, especially b/c V8, could really help Check for gap and corrossion/wear patterns to ascertain engine/cylinder running conditions. If you are unsure how to read plugs, then brush up on the subject (like I have to).
4.  Vacuum - MOST OVERLOOKED ISSUE in general engine work, all engines require vacuum to run various valves and components, vacuum leaks are more easily tested using gauge, bought/borrowed or performed in shop.
Check all these things, maybe fuel filter, too.
Special note: there is a chance if you have run tank (or someone else did) to empty repeated times that debris from tank has built up in fuel pump's internal filter, which is before fuel line filter. Only by removing and inspecting pump can this be checked. Inspect all previously mentioned items, then check fuel pump. If all that doesn't work, then give me a terrible grade and repost and I'll try again...
Paul

Posted on Nov 19, 2008

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