Question about 2000 Chevrolet S-10

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I have a 2000 s10 pickup, auto transmission with a misfire.

I have a 2000 s10 pickup, auto transmission with 117000 miles on it. It misses very badly when starting cold and then smooths out some. It lacks power and gets about 20 mi/gal. I have replaced the plugs and plug wires, the ignition control module, the air filter, fuel filter, and the down stream O2 sensor.I have had it to two different technicians and got two very different diagnosis'. I have run several tankfuls of fuel through it with injector cleaner in it. It throws a P0300 code for a while and then a P0304. The check engine light is on and flashes as I drive it. The I/M monitor status doesn't seem to come in on the O2 sensor and the catalyst after several drive cycles. The coil packs, I am told are ok as well as the EGR valve. I have a new up stream O2 sensor to install when I have a chance. I need some advice.Thanks

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OK, P0304 is a hard misfire on number 4 cylinder, P0300 is a ramdon misfire on all cylinders.You need to check the following, check the fuel injector for #4 cylinder to see that it is working, u do this with a use a 1/2" wooden dowl (avail from any hardware store) and listen to that injector, does it click? next you need to check for intake manifold gaskets and vacuum hoses for vacuum leaks, get a can of carburetor spray from a parts store and spray it around the top of the intake manifold gaskets, if u have a leak the engine will change sound when u hit a leak, next if the 1st 2 tests show no problem you need to run a compression check on the engine, a tester is about $40, it pays for itself as a shop charges over $100 to do the test, run a compression check twice to verify result's, all the engine cylinders should be within 5% of the highest reading, so for a simple example if the highest cylinder is 150 PSI then all the other cylinder must be at least 142 PSI or the engine will misfire, let me know what u find, these are the common things after defective plugs or plug wires..

Posted on May 13, 2010

  • 2 more comments 
  • dwgraf May 13, 2010

    I have had the compression and the injectors checked by both of the garages and they checked out fine. I forgot to tell you it has a 2.2L engine in it. I will try the carb spray and see what that does. Both techs said they swapped the wires and coil packs to see if it would make a difference and checked the plugs. The swapping made no difference.

  • yadayada
    yadayada May 13, 2010

    I have been a tech for 40 years and an someone is missing a big fault. call me at home if you like USA 925-459-0571

  • it71860 Dec 17, 2010

    I bought a 2000 s10, 2.2 about a month ago. It had no issues for the first month (it had a 30 day warranty?). After a rainy night, I had all the same symptoms, I found rotten vacuum lines and replaced them with no effect, the plugs are new titanium. Has 64,000 miles on it. Did you find the problem on your truck?

  • yadayada
    yadayada Dec 18, 2010

    This needs to go to a Chevy dealer.



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