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My 06 Jeep Liberty is reading its having multiple misfires the check engine light and traction control light is on in the dash truck starts and runs but pulls really sluggish my coils are firing ecu ?

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  • Jeep Master
  • 20,706 Answers

Why not say the code, let us decide what they mean.
P0300 code, in fact post all DTCs not just one if more......!!!
this code means MISFIRE< (that sluggish is that , misfiring)
cause by bad COMBUSTION.

1: bad spark ever to a tuneup? ever?
2: bad compression on the P030x (what is x) cylinder.
3: bad injection to P030x cylinder.

do post all codes. first.
verbatim.

Posted on Apr 18, 2015

6 Suggested Answers

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Posted on Jan 02, 2017

Mikey108
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SOURCE: 2002 Jeep Grand Cherokee Lardo misfiring

You say you changed the cam sensor. A1391 code is a crank sensor on the top of the trans. bell housing.

Posted on Feb 24, 2009

Bat1956
  • 585 Answers

SOURCE: 04 Jeep Liberty 3.7L Multiple misfire

Check the timing belt, tensioner, and the timing relationship of the crank to the cams. The cams never slip to each other but if the crank is off 2 or 3 teeth it will cause this. At 4 teeth off, only one cyl will fire.

Posted on May 01, 2009

mecanica03
  • 874 Answers

SOURCE: My 2007 Toyota Tundra 4.7l shows VSC OFF lights

check air filter for dirty , how many miles or kms have your car? , maybe need to replace spark plugs, try to reset the ecu for a momentany malfunction, remove the negative battery terminal few minutes and reconnect,start engine and drive, check if lights goes off , please write me

Posted on Jul 05, 2009

  • 412 Answers

SOURCE: 2004 Neon SXT cylinder misfire

TRY REPLACING THE CRANKSHAFT POSITION SENSOR..HAVE SEEN THESE CAUSE MISFIRES AND LOW VOLTAGE DTCS AS PCM THINKS VEHICLE IS NOT RUNNING..ALTERNATOR MAY NOT BE PUTTING OUT PROPERLY

Posted on Jul 07, 2009

  • 111 Answers

SOURCE: 2000 mercury cougar is hestating when you step on

a multiple misfire code can relate to a fuel problem check filter pump pressure let me know alan wrench

Posted on Sep 13, 2009

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My 2003 jeep liberty is showing a P0300 code. In the past we have replaced the computer and multiple vacuum hoses. I think it is prolly another vacuum problem but I dont know where to start. My...


it is multiple misfires on cylinders(random). this can be due to your vacuum leak over somehere on intake manifold. you can diagnose leaks by spraying brake pad cleaner on engine block when it is running. one location at a time. if idle speed or sound changes you will understand that there is a vacuum leak and it is sucking excess air from there. if it is only a misfire, this can be a micro crack on intake manifold.

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1 Answer

Please help me. I have an 04 jeep liberty sport 3.7l with 76000 miles and a constant engine light on. When started the idle jumps around too 1.5 to 2 rpms and stay high. While driving the engine will rev...


Did they give you the error codes, or just tell you that it was the multiple engine misfire, evap and TPS? If they didn't give you the codes then I would take it to an autoparts store and have them read the exact codes. Replacing the heads because the valves are sticky is questionable in my opinion. Dealerships sometimes are quite unreasonable when it comes to replacement parts. Plus they seem more apt to take advantage of a KNG (Know Nothing Girl) than most shops.

I would like more information about the engine combustion cleaning that they performed!

You might also want to go to the http://www.jeepforum.com/ and post it there. They have multiple Jeep specialists that might be able to steer you in the right direction.

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check security of the wiring for fuel injector for cylinder #2. Check resistance of this injector and compare the reading to another injector. replace if needed

There may be an issue with your fuel pump relay or its wiring. however service injector first to see if trouble code does not return

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