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1998 c1500 po300 missfire #4 cylnder

Misfire #4 cylinder new spider wires plugs 135 psi comp cop roter cam sensor

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2003 acura tl error codes po301 po302 po304 po306 p1399 po300


PO300 and P1399 are random cylinder misfire detected.
PO301 cylinder 1 misfire
PO302 cylinder 2 misfire
PO304 cylinder 4 misfire
PO306 cylinder 6 misfire
I would say that you have damage to the ignition wiring harness or you ECM is failing.

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I have 03 envoy so 6 cylinder change sparks plugs change oil p0300 GMC code check engine light blinking misfiring


engine misfiring can be either plugs ( changed) HT leads ( broken internally from pulling them off the plugs to do the change)and injector faults. Moving wires around to get to plugs.. If you have individual coil packs for the plugs then check that they have refitted correctly or the wires and connections for them are properly connected .. If all is ok then have a compression test done as low compression shows up as one of the reasons for random / multiple misfires (po300)

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I have a few error codes for my 2004 dodge ram hemi 1500 4x4. they are po172, po300, and po304.


The p0172 is due to an O2 sensor in the exhaust seeing too much oxygen, the po300 is a missfire present and p0304 is cylinder #4 missfire, check plug and wire to #4 and repair, this should also take care of the p0172, if a cylinder is missing it is just pump air into the exhaust thus causing the code p0172.

Jan 13, 2012 | Cars & Trucks

1 Answer

3.5l engine, car shakes runs ruff, changed plugs,shaking lessened and car runs slightly better. took to auto zone had tested code P0344 possible problems cam sensor defective, timingbelt/out of...


the chances are good for the number 5 coil needing replacement, but before i did anything else i would change that cam sensor, that could be causing your problem all the way around.. hope this helps... setting timing is a big drawn out job, i dont think you will need to do that, timing shouldnt be out.

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2 Answers

Check engine light flashing runs rough not firing on all cylinder2000 lincoln navigator with large triton engine Hooked up diagnnostic and it said 1. system too lean bank #2 2. Unable to bleed up fuel tank...


you may try your rotor button and distributor cap. and spark plug wires. try your map sensor also they tend to cause a lot of misfiring if they go bad.hope this helps.

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1 Answer

Misfire in #4 cylinder 96 c1500 4.3 new cap rotor wires and plugs


need to do a compression test on that cylinder, if compression is low (less than 100 psi) do a leakdown test to see where the leak is. My guess is that there is either a burnt valve on that cylinder, or the camshaft lobes for that cylinder are worn down, and not working the valves properly.

Mar 11, 2010 | 1998 Chevrolet C1500

2 Answers

I have 1999 318 4x4 dakota with fault coads


These are misfire codes.This means that your vehicle is missing.The 300 is a random misfire and the 305 is for cylinder 5,and the 306 is for cylinder number 6.Check the plugs if they are good then you could have bad coils.They are top of the plugs.Hope this helps.Good luck.

Feb 25, 2010 | 1999 Dodge Dakota

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Have po301 code 1 cylnder misfire whats the


anything from bad wire .plug or fuel delivery problem to cylinder 1pull plug and c if fouled -also test wire for break

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1 Answer

1998 Cavalier No Spark in cylinders 1 & 4


ignition mod. grounds,pcm or timing belt could all be it but, I would have to look at timing first.

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