ignition/engine misfire code (sleuth work needed) - Defender Source
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  #1  
Old July 7th, 2010, 07:42 PM
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ignition/engine misfire code (sleuth work needed)

Hoping for some sleuth help from other D90ers out there. My Check Engine light came on, took it to my mechanic and he said it reported an "ignition/engine misfire code" (nothing specific). Since I just had the heads re-done last year, he suggested that I first replace the plug wires since they were original OEM. So, I did that, reset the light and about 20-30 miles later, light is back on. Any ideas on what to check next? Obviously, I would like to take the most likely route to diagnosis and limit my expense.

Engine is running as smooth as silk, so no noticeable issues there neither on idle or full acceleration.

I saw other posts on the "misfire code" coming up when it is actually a "rough road ABS" issue? One guy reported a blown out shock. My shocks & springs are original and could use replacement for offroading purposes (putting together that fund now), but they are not soft or "bouncy" (ride seems fine on the road).
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  #2  
Old July 7th, 2010, 09:15 PM
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Mine does it occasionally too and I already changed the plugs and wires (8mm). I have 56K and the engine runs smooth as silk.

I have not spent too much time on it, I just reset it when it happens again. Let me know what you find.
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Old July 7th, 2010, 10:13 PM
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Michael Jekogian
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did you change or check all the plugs when you changed the wires I went with a hotter plug when I was having some misfiring that and wires did the trick? Are the wires on good and tight?
my guess would be to look at the coil next.
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  #4  
Old July 8th, 2010, 02:52 PM
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i have had the same problem and have changed wires and plugs too. i'm wondering if isn't due to running a non-standard exhaust system(flowmaster)? maybe the decrease in back pressure messes with the airflow sensor?
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Old July 13th, 2010, 11:19 PM
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Have "non-standard" exhaust, but it has been on for years without the light issue. Plug wires are on good and tight, and plugs are a year old. Guess the coil is the next step...unless I hear any other ideas??

Big issue now is that I cannot get it to pass NC State Inspection right now due to the fault code. After I changed the wires, we reset the light, and it was off for about 20 miles and came back on. I have also been told even if I reset the Check Engine light again that the code will "still be in memory" and show up if I try to get it inspected while the light is temporarily off. Ugg!!
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Old July 14th, 2010, 12:41 PM
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Michael Jekogian
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If you clear at the door to the inspection and it takes 20 mile to come back you should be ok. do you have a OBII reader?
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Old July 14th, 2010, 04:05 PM
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Gary
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[QUOTE=hlamar;230591] Guess the coil is the next step...unless I hear any other ideas?? [QUOTE]

???
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  #8  
Old July 19th, 2010, 08:06 AM
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Michael - I was told that the computer has "memory" and despite "clearing"/turning off the light, the code would still come up on the NC Inspection computer when they hooked up to the truck? Does anyone know if this is so?

GYM - I guess that I can only respond to your response of "???" (to my "??") with "????"...
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