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Unread 01-10-2008, 11:30 PM   #1
Aran
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Misfire on Cylinder 1 and 6

I finally got an OBDII scanner, and it pulled three codes. I didn't write down the codes themselves, but my scanner has on-screen definitions. The first was multiple cylinder misfire, then the other two were cylinder 1 and cylinder 6.

Aside from checking the injectors, what should I look at? Don't say the head gasket, pretty please...

The fun thing is it'll run just fine for a few hundred miles, then all of a sudden the light comes on and bam, it pops into limping mode and runs like crap until I clear the code again, and runs fine until it pops on again.

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Unread 01-10-2008, 11:34 PM   #2
mickdawg777
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This is a coil-pack vehicle, right? I forget the transition to fully electronic. How about the plugs? The wires?
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Unread 01-10-2008, 11:49 PM   #3
EricsXJ
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Your problem might be due to one of the following conditions:


2000-2001 JEEP CHEROKEE
ROUGH IDLE / MULTIPLE CYLINDER MISFIRE

------------------------------------------------------------------------------------------
1801301 - ROUGH IDLE AT COLD TEMPERATURES
Date: 06/11/01
Model Year(s): 2000

Description: Some vehicle engines may exhibit a rough idle and / or Malfunction Indicator Lamp (MIL) light on condition upon initial start-up after a cold soak when temperatures are below 50 degrees F (10 degrees c). This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (Cal level 00Cal15C).




1801001 - ROUGH IDLE AT COLD TEMPERATURES
Date: 04/20/01
Model year(s): 2001

Description: THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 4.0L (ERH) ENGINE BUILT PRIOR TO APRIL 30, 2001 AND CALIBRATION LEVEL PRIOR TO (LESS OR LOWER THAN) THOSE LISTED IN THE OVERVIEW ABOVE. This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (WJ/TJ — calibration level 01Cal14C, XJ — calibration level 15B.)

Details: Some vehicle engines may exhibit a rough idle and/or MIL light “on” condition upon initial start-up after a cold soak when temperatures are below 50°F (10°C).




0900303 - 4.0L MULTIPLE CYLINDER MISFIRE
Date: 08/01/03
Model Year(s): 1999-2004

Description: NOTE: THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 4.0L ENGINE. This bulletin involves inspection of all engine exhaust valves and a decarbonizing procedure if necessary.

Details: The customer may experience an incident of engine misfire during certain vehicle operating conditions. The misfire may occur when the vehicle is operated between 50 - 70 MPH and under light loading conditions, e.g. slight uphill road grades. This condition may occur at all ambient conditions, but is more noticeable when ambient conditions are less than 0 C (32 F).

If the vehicle is equipped with On-Board Diagnostic (OBD), a MIL illumination may also have occurred due to Diagnostic Trouble Code (DTC) P0300 - Multiple Cylinder Misfire. Various single cylinder misfire DTC’s may also be present. If the frequency of misfire is high the Powertrain Control Module (PCM) may place the engine in “Limp-In” mode.

The misfire condition may be caused by one or more engine exhaust valves that are slow to close. Late closure of an exhaust valve may be the result of no valve rotation and associated build up of carbon on the exhaust valve stem.

This condition may occur when the engine is not allowed to run at engine RPM’s that are greater than 3,200 RPM. At 3,200 RPM or higher the engine exhaust valves will rotate if not impeded by high carbon deposits. Low engine RPM’s and high carbon deposits are associated with short trip driving where the vehicle engine is not allowed to fully warm to normal engine operating temperatures. Cold ambient temperatures will increase engine warm-up time and add to the opportunity of carbon deposit build-up on the stem of the engine exhaust valve.




1803103 - 4.0L ROUGH ENGINE IDLE AFTER RESTART FOLLOWING A HOT SOAK
Date: 09/05/03 (supercedes 1802702 dated 09/06/02)
Model Year(s): 1999-2004

Description: NOTE: This bulletin applies to vehicles equipped with a 4.0L engine. This bulletin involves the installation of a fuel injector insulator sleeve.

Details: Customers may describe a 20 to 30 second rough idle following the restart of a heat soaked engine. This condition may be most noticeable when the engine is restarted following a prior 10 to 20 minute heat soak in hot ambient conditions of approximately 32 C (90ºF) or higher. This condition may be consistent with short city stop-and-go driving trips and can be aggravated by the use of fuel with a high ethanol content. Depending upon various conditions a MIL may occur due to DTC P0303 - Cylinder #3 Misfire.

This condition may be caused by heat from the exhaust manifold that following engine shut down migrates to the area around injector #3 and causes fuel vapor to form within the injector. This in turn may cause a momentary misfire of cylinder #3 until the fuel vapor is cleared of injector #3. The insulator sleeve lowers the injector #3 temperature to a point below which the fuel will not normally vaporize.

If vehicle exhibits a rough idle, and if a misfire of cylinder #3 is observed following a 10 to 20 minute hot soak, perform the Repair Procedure.

Parts required:
56028371AA Ignition Wire Shield

Repair procedure:
1. Cut insulator sleeve, p/n 56028371AA, to make two (2) insulator sleeves about 25-30 mm (1 in.) in length. See diagram.
2. Install one sleeve around injector #3, with the slit on the upward facing side of the injector. Install the other sleeve with the slit on the downward facing side of the injector.
3. Confirm sleeve is flush to intake manifold surface around injector.
4. Check injector #3 wire and ensure that the injector is rotated to a 2 o'clock position (from driver’s side of vehicle).
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Unread 01-10-2008, 11:51 PM   #4
EricsXJ
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And you can start by replacing the spark plugs if they are due for a change.
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Unread 01-11-2008, 04:13 AM   #5
Jeds Sr.
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Check the inside of the distirbutor cap for a crack.
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Unread 01-11-2008, 04:43 AM   #6
MBJR9
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Quote:
Originally Posted by Jeds Sr.
Check the inside of the distirbutor cap for a crack.
He has a DIS, there's no cap/distributor to check.
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Unread 01-11-2008, 10:15 AM   #7
jaredakleiman
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i had the same codes thrown a little while ago and I just changed my plugs and its all better now.
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Unread 02-07-2008, 11:40 AM   #8
Aran
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Whoa, what the hell happened to me here? I disappeared for a month.

The plugs and wires are all new, I'll look into the other things.

Thanks guys!
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Unread 12-07-2010, 07:16 PM   #9
ohwillyb
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I have seen this topic many time but yet have found out what is causing this?? Any answers???
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Unread 12-07-2010, 08:46 PM   #10
Kevin108
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There's 2 things wrong here:

1. This thread is almost 3 years old.
2. The OP said he had a 2000 XJ with spark plug wires.
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Unread 07-21-2011, 07:32 PM   #11
BigJoshStud
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I keep getting the misfire cyl 1 code in my 98 TJ sport. I've changed all the plugs, wires, cap and rotor. Any suggestions on what it could be and possible fixes? Also, I have an edge programmer. Should I widen the spark plugs further than the factory settings?
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Unread 08-09-2011, 02:50 AM   #12
Aran
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Quote:
Originally Posted by Kevin108 View Post
There's 2 things wrong here:

1. This thread is almost 3 years old.
2. The OP said he had a 2000 XJ with spark plug wires.
Yes... I don't know why I said that. Apparently I had a moment of retardation.


Edit: And you probably won't like my solution: About two months later my engine seized hard and I put a new one in. Never found out what the problem was.
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Unread 08-10-2011, 02:06 PM   #13
ohwillyb
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finely fixed misfire codes

I have been tying to fix my random cylinder code I think I finally got it. After replacing the plugs, new coil packs and o2 sensor I finally figured out the the problem was in the valves i'm replacing the head hopefully that will do it.
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Unread 08-10-2011, 02:16 PM   #14
Kevin108
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I got a used engine in better shape than mine and cheaper than just replacing the camshaft. Screw it, out with the old and in with the new!
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Unread 08-15-2011, 12:16 AM   #15
Aran
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I went from a 186k mile engine to a 90k mile engine. It's great.
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