1997 S10 4.3 P0300 random misfire Problem

Asked by Mar 15, 2017 at 11:26 PM about the 1997 Chevrolet S-10 2 Dr LS Extended Cab SB

Question type: Maintenance & Repair

I have a 1997 S10 with a 4.3 engine. It has a code P0300 random misfire on it. I have change about everything  on it and still has the code and misfires and backfires. Spark plugs, timing chain and gear, distributor, ignition module, rotor, egr valve, PCM, MAF sensor and module checked out, Spider injector all changed and still same issue. Ran a compression check and have 150#s on all cylinders. Had catalytic convertor checked and not clogged. Fuel pressure is at 60 PSI. Checked timing out several times and is in time! Help!!

2 Answers

77,985

A back-fire usually has to do with timing. Did you look at the timing marks on the camshaft gear to the crankshaft gear to see that they line up? When installing the engine crankshaft should be rotated 2 complete rotations to see if the marks line up on the gears. Also how about the distributor, it wouldn't happen to be off 180° would it?

Any time you change out the timing chain, distributor, you have to do what's called a relearn procedure. Need a scan tool to perform this. A good mechanic shop will have this tool. This resets all the sensors and clear your problem.

Your Answer

Chevrolet S-10 Experts

  • #1
    Andrew Olsen
    Reputation
    2,590
  • #2
    John Saffrahn
    Reputation
    1,060
  • #3
    Trebor66
    Reputation
    1,050
View All

Related Models For Sale

Used Ford Ranger
59 Great Deals out of 336 listings starting at $1,950
Used Toyota Tacoma
37 Great Deals out of 1,247 listings starting at $4,444
Used GMC Sonoma
10 listings starting at $3,995
Used Ford F-150
641 Great Deals out of 9,036 listings starting at $1,500
Used Dodge Dakota
5 Great Deals out of 141 listings starting at $1,500
Used Chevrolet Blazer
11 listings starting at $4,495
Used Nissan Frontier
29 Great Deals out of 607 listings starting at $5,499
Used GMC Sierra 1500
208 Great Deals out of 10,811 listings starting at $1,495
Used Dodge Ram 1500
39 Great Deals out of 460 listings starting at $3,488
Used Chevrolet Camaro
925 listings starting at $12,498

Used Cars For Sale

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.