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No fire to 2,4,6 cylinder 99 jeep grand Cherokee 4.0 changed plugs n coil pack

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Hmmm I suspect the timing chain has worn guides and jumped some teeth hence the misfires. possibly broken valve springs, possibly burnt/bent valves. Is there a loss of coolant? {blown head gasket} 2,4 and 6 are all on the same head. Tough one, see if you can get it to Autozone or Oriely's to put the code reader on it and see if there is a readout of whats happening, sorry couldn't be more help. good luck.

Posted on Oct 20, 2013


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Posted on Jan 02, 2017

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SOURCE: Jeep Hesitates. P0303 code

Check the cylinders Commpression. over 115 psi is good, 120 psi is normal.

Posted on Sep 17, 2008

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SOURCE: #3 cylinder miss firing--2001 jeep g.c. larado

check from the spark plug back...

Posted on Mar 17, 2009

  • 110 Answers

SOURCE: i have a 99 grand am SE 2.4 4 cylinder and my

A misfire doesn't always have to be ignition... it's just the most common cause. Faulty or plugged injector, low compression. You need to check fuel pressure and test the fuel injector flow. Then check compression. If you don't have tools for these tests, take it to someone who does. Testing is much cheaper than throwing parts at the problem.

Posted on Feb 25, 2010

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SOURCE: 99 grand cherokee with 4.7l

on the spark plug core? the end the "spark" is made? If so this could mean a few different things!
valve seats, valve seals, or piston rings!
the misfire itself would more than likely be a faulty coil pack for that cylinder, caused from the oil!
a compression check will prove bad rings, valve seats, or valve seals(IF that cylinder doesnt "hold" compression)
Good luck

Posted on Jan 22, 2011

  • 249 Answers

SOURCE: 2000 galant 2.4. coil pack

it could be a broken wire going from ECM to the coil

Posted on Sep 24, 2011

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1 Answer

How I can fix miss fire cilender #2, Jeep Grand Cherokee 2004

change the plugs if it continues to do it replace wire/ coil if I remember correctly these have individual coil/wire for each cylinder its not like older models with cap, rotary button, and individual wires

hope this helps

Aug 30, 2014 | 2004 Jeep Grand Cherokee

1 Answer

99 jeep grand cherokee has power to one coil pack but no spark

The 6 cyl engine uses a coil strip for all 6 cylinders, and the 8 cyl uses one coil per cylinder. So I assume you have an 8 cyl engine.
You are saying one coil has power but is not firing ?
Have you switched it with another cylinder to eliminate the coil as a possible problem ?

Apr 06, 2013 | 1999 Jeep Grand Cherokee

1 Answer

How do you replace spark plugs on 99 jeep grand cherokee

If it is a 4.0L, remove the 4 13mm bolts and lift up on the coil pack and flip it over. Remove your spark plugs and install the new ones. Put dielectric silicone in the boots and reinstall the coil pack. If it is a 4.7L, you have to remove the air box on the top of the engine. Each cylinder has it's own coil pack which is retained by a 10mm nut. remove this and the coil pack comes out. the 2 rear on the passenger side are harder to remove because of the transmission dipstick bracket. You will need a long extension to get the spark plugs out. Repeat the same procedure from the 4.0L installation. Hope this helps

Best of luck

Jun 12, 2010 | 1999 Jeep Grand Cherokee

2 Answers

2000 grand cherokee #7 Cylinder not fireing

replace the coil pack... to confirm this pull spark plug leads off the coil pack one at a time.... note whether the idle changes. the spark will actually arc and you can hear it. if one of the plugs does not have this arcing... the coil pack is at fault.

Please take a moment to rate this solution.. thanks

Apr 19, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Miss fire cylinder 1 & 6 on a 4 liter enginge

Did the engine light go on, and you got a miss-fire code? If so, 1st check spark plugs (which u did), then plug wires, if that's not it, the injectors would be next. Let me know how u make out

Mar 02, 2009 | 2000 Jeep Grand Cherokee

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