RE: Montero Misfire Cylinder 6

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RE: Montero Misfire Cylinder 6

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Mitsubishi Forum >> Mitsubishi Models >> Mitsubishi Montero & Montero Sport >> RE: Montero Misfire Cylinder 6

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RE: Montero Misfire Cylinder 6 - 6/5/2007 9:41:20 AM

off roader

Posts: 419
Joined: 10/20/2005
Status: offline

Don,

One common problem in earlier montero's is that have idle problems is the Idle Speed Controller (ISC) which on the earlier models is located at the 4:00 oclock position as you look at the round intake opening where the intake hose goes into the intake manifold. Not sure about your model year montero however so you'll want to check it via the Factory Service Manual if you have one.

The ISC needs to be cleaned occassionally of the dust/dirt/grime that can accumulate on it. Simple removal and wiping off using a rag accomplishes this. If you don't it, then it has to work harder and eventually fails sooner that it would otherwise. If it fails, it can even take out your ECU so make sure it's working properly.

HTH.

(in reply to dcvee)

Post #: 31

RE: Montero Misfire Cylinder 6 - 6/6/2007 4:32:50 AM

dcvee

Posts: 21
Joined: 2/26/2007
Status: offline

Hi Off-Roader. Well we have a misfire code(cylinder 6)being stored. That is why the idle quality is poor. I've cleaned the ICV(or ISC) twice since I've owned this thing. Apparently, the misfire clears somewhat upon an increase is vehicle rpm. I can definitely say the thing runs DAMN fine once above 2k rpm or so. It just really show's it's ugly face right at idle or slightly higher.

On a side note, I now have the dreaded "front wheels blinking" on my dash indicator. I can't remember the last time I've had so much grief with a vehicle

. I don't think the front axle is engaged however since it doesn't feel or drive any differently....but I'll be checking that out soon as well.

Don
(singing the Montero blues)

(in reply to off roader)

Post #: 32

RE: Montero Misfire Cylinder 6 - 6/11/2007 7:02:50 AM

dcvee

Posts: 21
Joined: 2/26/2007
Status: offline

Well I had a little time Sunday morning and fixed the 4wd light blinking problem. Seems I knocked a vacuum hose off. The one on the firewall directly behind the TB. Of course I started at the axle/transfer case and worked my way up so it took me about an hour to find it!!

This thursday will be my next opportunity to fix the miss.

Don

(in reply to dcvee)

Post #: 33

RE: Montero Misfire Cylinder 6 - 8/8/2007 4:41:23 PM

dcvee

Posts: 21
Joined: 2/26/2007
Status: offline

Well, believe it or not the Montero is FINALLY fixed and running great. I don't know how I screwed this up this bad(well actually I do)but it was a bad injector causing the misfire. The leakdown test definitely showed the valves were leaking so the heads needed to be done. This was found via an O-Scope which I didn't have. But I swapped injectors. I must have screwed up somehow when I did it. I remember taking ONLY bank 2 injectors out(2,4,6)and swapping them after I ultrasonically cleaned them. I MUST have put the same injector back in #6 that was in before. Don't know how that happened but obviously, I messed up.

I also screwed up by getting into another project and not staying with this one(started road racing one of my BMW M3's). I'm afraid I have to take the blame for this one...not the Montero

. Injectors go bad and are easy to check...I just messed up with my diagnosis.

Just wanted to post this in case someone ever has the same problem they can reference this and at least see what was wrong in this particular incident. Valves were leaking and vehicle had one bad injector.

Don

(in reply to dcvee)

Post #: 34