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2001 Jeep cherokee cylinders 1 & 3 misfire engine light on only when starting engine when hot, Do I need to replace injectors?

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INJECTORS COULD NEED CLEANING.

Posted on May 02, 2010

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1 Answer

2001 buick century P0304 step on gas engine light starts flashing


P0304 is engine misfire #4 cylinder Several things can cause a misfire #1 electrical which you have covered #2 Mechanical Test engine compression is should be around 150 cranking and 120 running . internal valve train components can cause bad compression and the valves then self. #3 fuel injector can be the cause suggest swapping with a know good cylinder and see if misfire follows injector.

Aug 19, 2014 | 2001 Buick Century

1 Answer

Misfire p0303


it means only, that combustion energy on cylinder 3 is weak.
it can be :
bad spark. #3
bad fuel ratio (lean or too rich) #3 (injectors)
bad compression. #3
we find it by doing tests, with simple tools

do you want guess or test?

Apr 05, 2014 | 2001 Jeep Cherokee

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When I first start my 2001 Jeep Cherokee in the morning, it runs very rough for a few minutes, then is smooth. Doesn't run rough every morning. The check engine light comes on and sometimes flashes,...


You could have 1 of these 3 problems.

1. The injector on cylinder #5 is clogged and not injecting.
2. The Ignition coil on Cylinder #5 is not firing.
3. One of the exhaust valves on #5 is sticking due to carbon build up.

Hope one of these gets you closer to the solution.

Oct 30, 2013 | 2001 Jeep Cherokee

3 Answers

CODES-PO301-PO303-PO316- CHANGED PLUGS & WIRES. STILL MISS ON START UP, GOES AWAY MOST OF THE TIME ABOVE 1000 R.P.M


P0301 - Cylinder 1 Misfire Detected.

Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak

Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

P0303 - Cylinder 3 Misfire Detected.
Follow info from P0301.

P0316 - Misfire Occurred In The First 1,000 Engine Revolutions.

Causes:
- Damaged CKP sensor.
- Ignition System.
- Fuel Injectors
- Running out of fuel
- Fuel Quality
- Base engine
- Damaged Powertrain Control Module

Solutions:
Usually the P0316 is combine with a P03XX codes. The P03XX code indicates in which cylinder the misfire occurred.

Jan 17, 2011 | 2002 Mercury Sable

1 Answer

Jeep Grand Cherokee 2004, code 0205, problem with misfire.


Anytime you have a misfire you check the easy things first.Plugs,wires,and coils.Then injectors or a mechanical problem.It seems you went for the expensive things first.I have had problems with the ignition coils on these vehicles.The only good thing is you eliminated the expensive things.Good luck.

Mar 02, 2010 | 2001 Jeep Cherokee

1 Answer

Sometimes i start my cherokee and it misfires for like ten minutes ands throws code. code sayts misfire cylinder 3 and fuel injector circuit open


Cylinder 3 AND 4 are the hottest of the straight 6 engines, the misfire is most likely caused by coolant seeping into the cylinder and shorting the plug out. If this continues it will eventually burn/blow the head gasket out from between the 3 and 4 cylinders. You will need a compression test and a radiator pressure test to determine if you have coolant seeping into the cylinder. If you do you will need a valve job (Possibly a new or rebuilt head). Also flush the cooling system out while you are in there.

Feb 24, 2010 | 2001 Jeep Cherokee

3 Answers

1999 jeep cherokee 6 cylinder engine light


1.Plugs
2. Vacuum leak
3. Injector fault
4. High or low fuel pressure.
Thats the list of things to check.
This is a #3 cylinder misfire.
There is also TSB about #3 injector needing added heat protection. This could definitely be the cause. I start at plugs and go from there.
Hope this helps.
Thank you,
Lee

Dec 12, 2009 | 1999 Jeep Grand Cherokee

1 Answer

2001 Jeep Cherokee with 6 cylinder engine -- PO306 code cylinder


Plug, plug wire, plugged or open fuel injector. are the most likely.

Sep 28, 2009 | 2001 Jeep Grand Cherokee

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