» » »

Chevrolet Q&A

Ask Your Question

1998 Chevrolet S10 Question: P0300 Random misfire

 

Question

cryogenics, Friendswood, TX, February 11, 2009, 15:21
 Rookie

I change out the ignition coil;fuel filter, wires,PVC,plugs,rotor & cap and air filter,clean thottle body check for vacuumm leaks. the codes was reset after driving for about 20 miles check engine light came back on check code same P0300 Random misfire

6 Answers
Flag This
  • Answer #1

    Russ February 11, 2009, 20:08
     Master

    Can you feel the engine misfire? Any other codes? Which engine is in your S10? Manual or automatic transmission?

    Flag This
  • Reply

    Visitor, February 15, 2011, 18:18

    yes...no...2.2

    Flag This
  • Reply

    Jim Taddei, February 16, 2011, 08:17
     Master

    It look like you have taken care of the ignition possibilities. There still could be a mechanical fault - check compression. Or a fuel injector or injector signal fault. If you can feel the misfire, monitoring the engine with a quality scan tool should help pinpoint the cylinder causing the misfire.

    Reply
    Flag This
  • Answer #2

    heavy_dman March 19, 2009, 20:16
     Rookie

    As I have learned through trying to figure out my problem, a bad mass air flow sensor can cause misfire codes, sense it regulates and measures the amount of air that passes through, the three main components of a running engine is fire, fuel, and air, to much or too little air can cause all the problems that you have discribed, also the mass air flow sensor is notorious for going out on these engines

    Reply
    Flag This
  • Answer #3

    Visitor, March 29, 2010, 06:12

    i would ck the popit nosil injectors(octo-puss style) thats the number 1 problem i have had with them sense day one

    Reply
    Flag This
  • Answer #4

    Visitor, September 06, 2010, 16:33

    Pull out the trouble code on your vehicle and change whatever parts necessary

    Reply
    Flag This
  • Answer #5

    Visitor, January 03, 2011, 18:07

    i change coil,spark plugs , wires, oil, and oil filter

    Reply
    Flag This
  • Answer #6

    lmatta80 June 06, 2012, 11:04
     Rookie

    Many things can cause such an issue, but the one issue that is solely S-10 related is that the earlier-model poppet-style fuel injectors used in the '96-and-up model year Vortec engines were prone to sticking open or sticking shut after a large mileage buildup. Gm was even forced to address the issue in the early '00's by updating the injector style. The new injectors had the same flow rate, but were designed in such a way as to alleviate the problems found in the earlier ones.
    There was even a forced recall/replacement in the state of CA due to a lawsuit by the EPA in that state, claiming the poor design was leading to a higher-than-average rate of emissions testing failures in the above-described model years.
    This is oftentimes the culprit in the 4.3 engines when all the other standard solutions have been exhausted, ie: spark plugs, wires, cap and rotor, etc..

    Read more: http://wiki.answers.com/Q/What_causes_random_misfire_on_1...

    Reply
    Flag This