2002 Chevy S-10 4.3 v6 that has the code of cyl 4 misfire but there is no misfire.

5

Asked by Apr 19, 2016 at 11:42 AM about the 2002 Chevrolet S-10

Question type: Maintenance & Repair

on my 02 Chevy S-10 4.3 v6 that has the code of cylinder 4 misfire but there is no misfire, the truck runs and idles perfect, I have to get the thing smog tested and it will not pass because check engine light is on.
MAF sensor was cleaned and plug and wires are new.  its like the code is stuck in the computer.

2 Answers

78,425

Just cause you can't feel a misfire doesn't mean it isn't there, the computer is constantly checking the amount of voltage required to fire each cylinder, it is possible that you have an injector that is partially plugged or an internal vacuum leak so that cylinder is leaner than the others but is getting enough fuel to burn so it doesn't feel like a normal dead miss. You could try having the injectors professionally cleaned to see if that helps. If not it maybe internal, but a shop will have to determine that.

37,975

All tho, it may have ben a fluke and is cleared up. You can go to Auto Zone and use their scanner to clear the code which will reset the check engine light. But if it comes back on and you get the same code it would be:P0304 CHEVROLET - Cylinder 4 Misfire Detected.... Possible causes - Faulty spark plug 4 - Clogged or faulty fuel injector 4 - Faulty ignition coil 4 - Fuel injector 4 harness is open or shorted - Fuel injector 4 circuit poor electrical connection - Ignition coil 4 harness is open or shorted - Ignition coil 4 circuit poor electrical connection - Insufficient cylinder 4 compression - Incorrect fuel pressure - Intake air leak

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • 1999 4.3 misfiring 35 answers

    I'm running out of ideas on a problem with my 99 S10 4.3 The truck will start and idle fine however as soon as you feed a little gas it starts to miss. Giving it even more gas is either covering up th...

    1999 Chevrolet S-10 2 Dr STD Standard Cab LB

    -

    Maintenance & Repair

  • random misfire 4 answers

    I have a 2000 s10 4.3 that has a bad miss and i changed the plugs and distributor and distributor cap and rotary button and it syill is missing so i ran a diagnostic test and it said random misfi...

    2000 Chevrolet S-10 2 Dr LS Xtreme Standard Cab SB

    -

    Maintenance & Repair

  • i have a 2003 s10 code shows misfire on number 4 cylinder it wont fire at all 2 answers

    code shows po304 cylinder misfire new plugs wire are good cylinder pressure is good fuel injectors show good but there is no fire at number four.

    2003 Chevrolet S-10 2 Dr LS Standard Cab LB

    -

    Maintenance & Repair

  • Misfire 2 answers

    I have a 1999 s10 4.3l vortec, it misses in cylinder 4, I have replaced the spark plug, and plug wire, but it continues to misfire, I am thinking I have a problem with the distributor cap or the w...

    1999 Chevrolet S-10 3 Dr LS Wide Stance 4WD Extended Cab SB

    -

    Maintenance & Repair

  • Misfireing 1 answer

    What the idle air control valve cause a 4.3 to misfire and idle rough on a 2000 s10

    Chevrolet S-10

    -

    General

Search Chevrolet S-10 Questions

Chevrolet S-10 Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 2,060
#2 John Saffrahn
John Saffrahn
Reputation 890
#3 Trebor66
Trebor66
Reputation 880
View All

Related Models For Sale

Used Ford Ranger
68 Great Deals out of 316 listings starting at $1,995
Used Chevrolet Silverado 1500
119 Great Deals out of 4,797 listings starting at $2,339
Used GMC Sonoma
9 listings starting at $2,495
Used Toyota Tacoma
34 Great Deals out of 598 listings starting at $3,495
Used Ford F-150
462 Great Deals out of 7,088 listings starting at $426
Used Dodge Dakota
25 Great Deals out of 163 listings starting at $1,300
Used Nissan Frontier
10 Great Deals out of 357 listings starting at $5,900
Used GMC Sierra 1500
174 Great Deals out of 5,652 listings starting at $2,900
Used Dodge Ram 1500
47 Great Deals out of 457 listings starting at $2,000
Used Chevrolet Camaro
3 Great Deals out of 895 listings starting at $10,995
Used Chevrolet Tahoe
337 listings starting at $6,477

Used Cars For Sale

2003 Chevrolet S-10 For Sale
1 listings starting at $3,490