Question about 2002 Chevrolet Silverado
I have a 2002 chevy silverado v6 extended cab that is experiencing loss of horsepower , sometimes when pushingthe gas pedal nothing happens. when idaling if i ease in the gas pedal i can get the truck to rev out, however if i punch it it revs out at about 2000 rpm before bogging down. The error code I got was for random cylinder missfire. I recently put new spark plug wires in which made the problem better but not for long. Also just put 2 new upstream O2 sensors in to no avail. Also did a mass air flow sensor swap with a buddy of mine which did nothing.
I would expect it to give a EGR code. Sounds like the egr valve might be seating on some carbon. That would act like a big vacuum leak, especially at idle, but could feel like a surge while cruising.
It can be removed and cleaned.
The fuel pump itself usually either pumps, or it doesn't pump.
There are, however, several things that might keep the fuel from getting injected into the engine properly.
A dirty filter is one of them, but usually a dirty filter stays dirty, and won't get better.
A split hose inside the tank can loose pressure, but that, also, won't be intermittent.
A faulty pressure regulator, which could be intermittent if there is a problem with its control system.
A poor ground or wire connection to the pump, but other than a dirty or loose ground, that will generally just quit.
All of those can be verified, or eliminated with a fuel pressure tester connected "when the problem is happening".
If the pressure drops, thus causing the problem, then you look at the operating system or the pump.
But if the pressure is up to specs when the engine looses power, that eliminates the pump as the problem.
I would never replace a pump without verifying it as the problem with a pressure test.
Your power loss, if the fuel pressure stays up, can very easily be the EGR valve.
I hate to see someone pay for that pump job, only to need further work afterwards, and the shop say "well....you were going to need a pump soon anyway".
I have seen pumps wear out in under 50,000 miles, but I have seen trucks with over 200,000 and still on the orriginal.
Dry Gas....if you have some good reason to think you have water in the gas, like catching some during a filter change or pressure test and seeing the water, then run some. Otherwise, it won't do anything for you.
But if you think you got some dirty or bad gas, I would for sure have the tank cleaned out.
But reading the stored codes should be the first step.
Posted on Sep 11, 2009
Cylinder misfire may also mean you need to have a new coil,the one that sits on spark plugs,or spark plugs or wiring to coil may be faulty..Hope this helps..Make sure you reset the car when u replace any part..
Posted on Sep 10, 2009
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Posted on Jan 02, 2017
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