Misfire no codes

Asked by Jul 08, 2017 at 02:53 PM about the 2004 Chevrolet TrailBlazer LS 4WD

Question type: Maintenance & Repair

So I have a 2004 Chevy trail blazer 4.2 engine. I
have owned the vehicle since February. It is
misfiring but there is no check engine light. I have
had it scanned now 6 times and have no codes
that are popping up or stored. I have replaced
cylinder 1 and 2 could packs, all plugs have been
replaced.  I took into a local Chevy dealership paid
117 for a diagnostic to be told it was bad coil pack
on cylinder 1 and the sensor in the gas pedal.
Everything was replaced with new parts and it is
still misfiring with no light or code.. please help

2 Answers

72,395

Turn on the ignition but don't start the engine. The check engine light should be on steady. If not, the bulb is likely burned out. If the check engine light is working and the engine is truly misfiring the check engine light will be flashing. If not there's something else going on. Another thing to be aware of is a "hard" misfire code won't usually set until the check engine light remains on. But with no check engine light or trouble codes look for something that can mimick a misfire. Such as a bad motor mount, or even a transmission problem that may be causing the vehicle to shake or jerk. Since the Chevy Dealer already worked on it, take it back. Wait for the vehicle too, don't drop it off. They'll get to it right away and be more prone to have answers if you're there and not on the telephone. HTH. -Jim

1 of 1 people found this helpful.
235

I 2nd the other items that can "mimick" a mis-fire. Bad motor mounts and/or tranny mounts will do it for sure.

Your Answer

TrailBlazer

Looking for a Used TrailBlazer in your area?

CarGurus has 4,267 nationwide TrailBlazer listings starting at $1,500.

ZIP:

Chevrolet TrailBlazer Experts

  • #1
    bigdogracer
    Reputation
    980
  • #2
    Tom Demyan
    Reputation
    900
  • #3
    tennisshoes
    Reputation
    700
View All

Related Models For Sale

Used Chevrolet Tahoe
820 Great Deals out of 41,738 listings starting at $1,987
Used Chevrolet Silverado 1500
2,649 Great Deals out of 173,588 listings starting at $955
Used Jeep Grand Cherokee
1,063 Great Deals out of 71,978 listings starting at $1,195
Used GMC Envoy
41 Great Deals out of 1,973 listings starting at $1,499
Used GMC Sierra 1500
1,211 Great Deals out of 64,383 listings starting at $999
Used Ford Mustang
589 Great Deals out of 38,990 listings starting at $1,895
Used Cadillac Escalade
260 Great Deals out of 11,936 listings starting at $1,200
Used Ford Explorer
1,235 Great Deals out of 69,037 listings starting at $750
Used Chevrolet Impala
584 Great Deals out of 34,402 listings starting at $900
Used GMC Yukon
601 Great Deals out of 20,717 listings starting at $2,600
Used Chevrolet TrailBlazer EXT
5 Great Deals out of 1,079 listings starting at $2,690

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.