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Chevy Silverado and GMC Sierra Fuel Pump/Fuel System

416 messages,  Last post on May 12, 2013 at 6:13 PM

You are in the Chevrolet Silverado & GMC Sierra Forum.

What is this discussion about? Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Truck

Messages Page 20 of 42

#186 of 416 2001 chevy silverado 1500 4.3 v6 by hiscokid

Mar 31, 2008 (5:15 pm)

I'm have a problem with my truck. It was running fine and the next time I went to start it, it wouldn't. The vehicle cranks over fine, I check the fuel pressure and its between 60 and 70 psi at the schrader valve. I've got plenty of spark at all the spark plugs, it just seems like there is no fuel getting inside the combustion chamber. Anybody have any ideas? This baby's got 191,000 miles on it.

#187 of 416 Re: 2001 chevy silverado 1500 4.3 v6 [hiscokid] by mickeymouse2

Mar 31, 2008 (8:33 pm)

Replying to: hiscokid (Mar 31, 2008 5:15 pm)
Spray a liberal amount of carb cleaner into the throttle body, then try and start it. If it starts briefly there is a fuel delivery problem. Pressure at the rail checks ok, so injecters are not firing. Most likely cause is a bad cam sensor. Other causes are an open circut from the oil pressure sending unit, security issue. If you have a security light on your dash that says security. After turning your key to run position, the light should not blink. Using a scan tool may be helpful. If you remember the last time you were driving it, if the check engine light came on during the drive. It is usually the cam sensor. Once the engine is shut off, the PCM can't find TDC and doesn't fire the injecters.

#188 of 416 Re: 2001 chevy silverado 1500 4.3 v6 [mickeymouse2] by hiscokid

Apr 01, 2008 (6:37 pm)

Replying to: mickeymouse2 (Mar 31, 2008 8:33 pm)
Thanks for the tips mickeymouse2, I ordered a scan tool and am awaiting its arrival. The check engine light had gone on a few times before it did this so you're probably right. Does it usually throw a code for the cam sensor then? If it is the cam sensor do you know if the pcm requires a relearn program once I replace it? Thanks again.

#189 of 416 Re: 2001 chevy silverado 1500 4.3 v6 [hiscokid] by mickeymouse2

Apr 01, 2008 (7:42 pm)

Replying to: hiscokid (Apr 01, 2008 6:37 pm)
Does it usually throw a code for the cam sensor then? Yes. Once your code indicates a bad cam sensor, it should still be checked with a graphing meter. However, thats expensive and the sensor is probably only 45.00. No relearn needed. Once a cam signal is seen by the PCM it will fire the injecters. Your check engine light may take awhile to go off by it self, or just do a clear code reset with the scan tool. If for some reason you disconected your battery and lost any stored information. You can reset the trouble codes by cranking the engine for at least 10 seconds, and any codes pertaining to no start up will reset if there is still a problem.
 
Also, special note. If the new cam sensor has a small piece of cardboard stuck on the end of it, size and shape of a dime, dont take it off. Thats for adjusting the air gap when you bolt it in. I don't think yours has this, its just a bolt in plug and play type. Good luck

#190 of 416 93 C1500 Runs Badly by deancolbe

Apr 03, 2008 (10:02 pm)

My 1993 4.3L Silverado suddenly runs badly. Air filter is clean. All fuel lines appear ok. Only 1 fuel pump installed.
Just filled gas tank earlier that day. Reputable, high volume station, never any fuel quality problems.
Engine acts like it is starving for gas.
What should I check first?

#191 of 416 Re: 93 C1500 Runs Badly [deancolbe] by obyone

Apr 03, 2008 (10:03 pm)

Replying to: deancolbe (Apr 03, 2008 10:02 pm)
easiest would be fuel filter

#192 of 416 Re: 93 C1500 Runs Badly [obyone] by deancolbe

Apr 03, 2008 (10:08 pm)

Replying to: obyone (Apr 03, 2008 10:03 pm)
How often should fuel filters be replaced? Mine was last replaced in 04/2003.

#193 of 416 Re: 93 C1500 Runs Badly [deancolbe] by obyone

Apr 04, 2008 (2:11 am)

Replying to: deancolbe (Apr 03, 2008 10:08 pm)
I would think that should be done on an annual basis depending on your mileage however most wait till so little fuel passes that it causes problems prior to changing. It's a cheap part and fairly easy to replace so I'd start there.

#194 of 416 Re: 2001 chevy silverado 1500 4.3 v6 [mickeymouse2] by hiscokid

Apr 04, 2008 (6:21 pm)

Replying to: mickeymouse2 (Apr 01, 2008 7:42 pm)
hello, I just wanted to update you on the truck. I got my scanner and plugged it in, got no codes. Decided to see if the truck would start and it did, I did nothing to the engine. Once it started It was misfiring alot but it seems like its progressively getting better. Does anyone have any other Ideas what it could be? Also does anyone know of a cheaper way to do a fuel injection cleaning other than bringing it to the dealer? thanks.

Messages Page 20 of 42

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