Question about 2004 Chevrolet TrailBlazer

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We had miss fire code 303 so we changed it to clydrer 4 then got 304 so we changed coil pack and still have 304 code

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Posted on Jan 02, 2017

  • 14036 Answers

SOURCE: Running rough check engine light on

cylinder 5 has a dirty or sticking injector. check pvc and egr valve.

Posted on May 10, 2009

  • 1632 Answers

SOURCE: multiple random miss fire

Now change the distributor. Get one from salvage or e-bay. Did the timing belt jumped a tooth or is it new. Vitally

Posted on May 12, 2009

jaysonemanme
  • 500 Answers

SOURCE: coil pack diagram?

cylinder 1 is on passenger side, coils should be numbered, cylinder 4 is on drivers side

Posted on May 18, 2009

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SOURCE: po 300 code pops up random cylinder misfire and

get a new car

Posted on Aug 13, 2009

  • 819 Answers

SOURCE: I have a 2002 TrailBlazer with the straight

did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
?

Posted on Feb 28, 2010

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2006 honda civic EXcheck engine light code miss fire cyl 1 new fuel pump new plugs coil packs running lean need help mike


Change the #1 fuel injector to #2 and #2 to #1 position.If the miss fire code changes to #2 cyl that fuel injector may need to be changed.I would try that first before spending $$$

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Code reader says 1-3-5 is missing but I know 1&5 is firing jERRY b


Intermittent misses can be caused by bad coils, dirty fuel injectors, and bad o2 sensors, to name a few.

Apr 26, 2015 | 2001 Jeep Grand Cherokee

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Error code p0420 and p0303


Code 303 is a miss or lack of power on cylinder 3. If you know for a fact that cylinder is getting spark it could be an injector problem.
Code 420 means the catalytic converter is not performing up to standard which could be several things including the miss on cyl 3.

Jan 30, 2014 | 2005 Chevrolet Trailblazer Ext

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#1 and #4 are not firing I changed the coil pack and still no change any ideas


You said you changed the coil pack and the wires but didn't mention the plugs. Try moving one of the plugs to a different cylinder and see if the miss follows it. It could also be the ignition module. (the thing the coil packs mount to.)

Oct 05, 2012 | 1993 Chevrolet Lumina

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My 2004 chevy trailblazer is missing badly. Had them read the code for me at auto zone and it said I had a miss fire on the number one cylinder. I changed the plugs and it is still missing badly


Try moving the coil pack from cylinder 1 to another cylinder (swap locations) and see if the same code comes up. If code is different, then coil pack is bad. Other reasons for miss; bad injector, poor compression.
Also, I know you changed plugs already, but always use AC Delco 43-103 plugs on this vehicle.

Sep 11, 2011 | 2004 Chevrolet TrailBlazer

2 Answers

Hello i have a GTI its a 2.0L manual transmission, i have been having problem after problem thus far. Current engine codes PO422, PO300,PO304,PO303,PO302. I do not have a code list to see what these are...


I think that PO422 is the Cat Converter, it may be bad or may be just the O2 sensor.
The PO300, 302, 303, 304 code have to do with the ignition coils or wires. (302, 303, 304 means there are ignition /firing problems in cylinders 2, 3and 4). If your lucky just the wire and new spark plugs.
Google "engine codes Jetta" for more on web. Good luck.

Feb 06, 2011 | Volkswagen GTI Cars & Trucks

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I have an 2002 buick century that has a iginition miss. We have changed the spark plugs, iginition wires, coil pack. It first came back with a miss fire number 2 cyclinder. The coil pack was changed. Now...


double check plug wires to be sure they go to the right cylinders. After that i would check fuel injectors
You need a listening device and listen for metallic clicking sound. Bad injectors will be silent and they do cause the same miss

Apr 21, 2010 | 1997 Buick LeSabre

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P0302 #2 cylinder miss fire code. Replaced plugs and wires but at 40 mph runs very rough. Idles smoothly but not when put in gear.


I have a 1999 ford escort 2.0, its got a miss on cylinder 3 and 4. I changed the wires and the coil pack but its still missing. When scanned I get code p1506, p0303 and p0304

Jan 02, 2010 | 2000 Ford Windstar

1 Answer

Code reader was reading miss in #5.changed coil pack now reads random miss fire


Recheck the ignition module, The module is what the coil pack sits on and the wire harness may be damaged due to corrosion or broken wires. At worst, the module is bad it self and needs to be replaced. Good luck and hope this helps.

Oct 28, 2009 | 1999 Pontiac Grand Am GT

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