2003 Chevy S-10 Fuel issues

DIRTYDIME03

MEMBER
2003 CHEVROLET S-10

Engine Mechanical problem
2003 Chevy S-10 4 cyl Two Wheel Drive Manual 130K miles

I'm having a problem in my truck. Recently it started skipping and dropped #3 & #4 cylinders which were due to bad injectors but the skip was still there and intermittent. It mainly skipped under a load such as changing gears or accelerating. It has a new fuel filter, coils, plugs, wires, injectors. Now #3 shut down again, I checked my fuel pressure and it is 52psi which is within specs. Can anyone help me figure this out?

5 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

If it does it under load, it may be ignition related. Injectors usually will go away at low rpm but feel like they come back under higher rpm. Have you tried wires? May even be a bad coil, start basic - A/C Delco plugs and wires

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Saturday, November 8th, 2008 AT 8:34 AM

DIRTYDIME03

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14 POSTS

The coils and wires are about 10K miles old and my truck has the fabulous waste spark design which uses 1 coil for 2 cylinders, wouldn't that cause 2 cylinder to die instead of one? Yes it does skip horribly at low rpm's and higher rpm's it levels out and runs right unless the throttle load is too much or too less.

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Saturday, November 8th, 2008 AT 2:08 PM

2CARPRO JACK

MECHANIC
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Yes, usually it makes 2 cyl's miss, and it wouldnt be 3+4. Did it set acheck engine light? Is that how you know you are losing 3 again? If so, just for laughs, swap the coils and se if it gives a different cylinder

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Sunday, November 9th, 2008 AT 8:37 AM

DIRTYDIME03

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Ok, I fixed the #3 problem which turned out to be a bad wire. My problem is still there, a stumble under a load. If you slowly acellerate there is no problem but a sudden load will send it into a skipping frenzy. I checked the fuel pressure and it was 52psi within spec, 10 minutes later it somehow gained 2psi. I have the same actron pressure tester thats in the website's store, with the engine running the guage hovers around 80psi but if I press the pressure relief its low around 35ish. Which would be the real reading?

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Sunday, November 9th, 2008 AT 12:49 PM

DIRTYDIME03

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I checked the compression today and got 90psi on #1 while 2, 3, 4 were 175-180psi. Since 2.2's are natorious for head gaskets thats what I'm leaning torwards.