Question about 2004 Jeep Grand Cherokee

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My 2 and 6 injectors were misfiring a month ago. i had the problem fixed. now 2 and 5 were misfiring. i disconnected all 6 of the connections to the injectors. reconnected them and it ran fine for a month until the other day. now number one is misfiring. what gives???

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You might have different problem than injectors, might have coil rail assy problem or spark plugs, what kind of gas are you using, good known brand and good octane? or are you using water/alcohol methanol arco, or other non good known brand this might cause fuel system to get dirty or create water or other material into injectors, also what state are you located at, is it very high level or cool weather, might need a pcm software update. let me know if this helps

Posted on Nov 19, 2009

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Posted on Jan 02, 2017

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2000 kia sportage. 190,000 miles. Cylinders 1 and 3 misfire an one random misfire. Had new spark plugs an wires done 8 months ago. What could be the problem?


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Possible causes
- Faulty spark plug 5
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What does this mean? What does this mean?
Tech notes
The P0305 code means that the cylinder 5 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 5. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes"
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When is the code detected?
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P0305 Jaguar Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

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A competent mechanic will check all probable causes associated with these DTC codes.
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Be sure the invoice enumerates all of these probable causes as having been checked. Also, some of the replacement parts installed earlier may be faulty.

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1 Answer

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1997 dodge dakota has a weak start then dies when gas is applied


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1 Answer

2003 with 3-0 well maitained. truck misfires at slow speeds.mechanic put computer on it and it indicated misfired on #1 cylinder at 1000 rpms changed wires didnt solve the problem. engine light still comes...


A misfire on this type of vehicle can be due to 2 factors if it missing spark it will trigger a misfire code and it you have a bad INJECTOR. Most misfires are due to missing spark but there are quite a few in my experience that were due to bad injectors or bad injector wiring. To check this you need a NOID light disconnect injector wire on suspected cylinder in your case #1 and connect wire to NOID light (engine must be running for this) Your NOID light should have a consistent flickering light going while vehicle runs at idle. If light its NOT flickering at a steady pace and flickers erratically. THE PROBLEM IS A BAD Injector wiring or a bad computer. If light flickers consistently and in a steady pattern then YOU HAVE A BAD INJECTOR. Replace injector and that will solve this problem. I know this is a lot of info but It will help you alot. Good luck and thanks for using FIX YA

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2 Answers

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