The Mitsubishi Pajero Owners Club®

tnewby · Posted: Sun May 08, 2011 12:02 Post subject: 3.2 DID misfire when warm - Help!

Guys,

I have recently bought Short wheelbase 3.2 DID on a '51 plate. It was fine for the first month but now it has developed a problem.

Description:

Starts and drives fine
Once engine is up to temperature it has an obvious misfire at idle which seems to be at the same place in the firing sequence.
When driving this leads to loss of power and engine will cut out.
Wait 10mins restart and it's fine.
Once back up to temperature fault comes back.

Tried:

Removed injectors had them cleaned and re-calibrated
Removed injectors and had new nozzles fitted and calibrated - (I thought one was sticking when hot)
Cleaned EGR
Replaced rubber fuel hoses

I was told by the previous owner that it has had reconditioned/replacement diesel pump fitted. It has only covered circa 90,000 miles is in very good condition generally.

This site is an excellent resource and if you could offer your suggestions I would really appreciate it.

Thanks,

Thomas

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assassin · Posted: Mon May 09, 2011 1:34 Post subject:

Try the engine temperature sensor, during warm up and starting it uses a different engine map.

tnewby · Posted: Mon May 09, 2011 7:18 Post subject: Temperature Sensor

Hi,

Thanks for the suggestion.

I suppose it's only a cheap part so worth swapping out by process of elimination. I am not sure why this would lead to a miss-fire though?

Thanks,

Thomas

tnewby · Posted: Mon May 09, 2011 9:46 Post subject: Engine Speed Sensor

Guys,

Having read around the internet a little and another post here on the forum I have seen "Engine speed sensor" mentioned a few times.

Autodata shows two engine speed sensors on the injection pump.

Have you any experience of sourcing/changing this part and if so what were the symptoms.

Thanks in advance,

Thomas

tnewby · Posted: Mon May 16, 2011 20:15 Post subject: Any thoughts?

Hi,

Still not solved the problem though it doesn't seem as bad at the moment.

I had a reliable auto electrician/fault finder have a look today and he confirms there are no fault codes but he has noticed that when the misfire occurs there is a "puff" of pressure from the inlet manifold. Does this ring any bells with anyone?

I have cleaned the EGR valve before but I will take another look at it.

Do you think this may be a sticking inlet valve/bent valve/valve guide?

Any thoughts are appreciated, I am reluctant to start stripping the head off...

Thanks in advance,

Thomas

tnewby · Posted: Wed May 18, 2011 18:11 Post subject: Update

Hi,

Okay, in the interests of anyone who may have the same problem...

Having spoken to a few people two suggestions have come forward which I have tried today:

1. Changed coolant temperature sensor
2. Created EGR blanking gasket/plate

Fingers crossed this solves the problem. I will post an update when I have run the vehicle for a couple of days.

Since I am new to the forum I am unable to respond to private messages. Thanks to those who took the time to make suggestions.

Regards,

Thomas

tnewby · Posted: Sat May 21, 2011 17:33 Post subject: Speed Sensor

Hi,

Having tried the EGR blank and coolant temperature sensor it is still acting up.

Interestingly, its a '51 plate and I have completely blanked the EGR with a template I made from one of the gaskets and it isn't showing a check engine light.

Whilst out today once it had covered around 15-miles it started misfiring as usual. This time the engine speed was bouncing from 200-2000rpm completely on its own. During this the rev counter was fluctuating but not in response to the engine speed. Then it cut out. Once is had cooled a little it restarted and I drove it home.

This brings me back to a thread I read about a guy who had a similar problem which was cured by changing 2-engine speed sensors located in the pump.

Has anyone any experience of changing these sensors? If so, are they available? Where does the rev counter get its pick-up from?

I intend to ring around a few diesel specialists and see if anyone has experience of changing these sensors and take it from there.

Once again any suggestions or help would be gratefully received.

Thanks,

Thomas

SWB CK · Posted: Sat Jun 04, 2011 6:21 Post subject: 4M41 Misfiring

Hi Thomas,
I have a 2000 Pajero CK with the 3.2 DID engine and it has the same symptoms as yours. I have also read from other forums that replacing the two engine speed sensors mounted on the electronic pump will fix the problem. To my understanding the speed sensors are giving a false data output to the ECU the reason the ECU compensates by injecting more fuel to correspond to the speed data sent by the sensors. I also read that the culprit could be the Accelerator Pedal Sensor (APS) giving the wrong signal to the ECU. Were you able to fix the problem?

Ted

tnewby · Posted: Sat Jun 04, 2011 15:03 Post subject: Fingers crossed

Hi,

Well, touch wood, I think it's fixed. I have changed both the engine speed sensors and that seems to have cured the problem. I have been out a few times and so far everything seems well.

It would seem this fault is more common than it would first seem. Unfortunately, many people, as would I had I followed advice, swap out the injection pump unnecessarily at huge cost! The real problem seems to be that when these sensors fail it doesn't always flag a fault code; in my case the codes were clear.

I hope this is the end of the matter. I have to admit I was very close to getting rid of the car! It would have been a shame because otherwise it's in excellent condition and drives great.

Thanks to all who made suggestions and hopefully others with the same problem might see this thread!

Regards,

Thomas.

SWB CK · Posted: Sun Jun 05, 2011 6:31 Post subject:

Hi Thomas,
Thanks for the info regarding the speed sensors. Can you please direct me to a website where i can buy the engine speed sensors located on the pump for the 4m41 3.2 DID. Thanks in advance and your help is much appreciated.

all the best,
Ted

LandRover · * Joined: 23 Sep 2010 Posts: 21 Location: SWFrance

That's a good idea.....maybe buy 2 for the glove box kind of thing??

Very Happy

jeffreygrant · Posted: Sun Jun 12, 2011 11:57 Post subject: Speed sensor

I have a 2002 3.2 DID Shogun and was experiencing the same misfire type of situation when the engine warms up. I was told by the dealer that I needed a new diesel injector pump (E2000) and then possibly the ECU. He would not guarantee a fix. PLEASE, DO NOT ALLOW anyone to replace your diesel injector pump or ECU!!!!

After some research on the web in this forum and others, I was confident that the SPEEDSENSOR,INJECTION PUMP TACHOMETER was the problem. I ordered one from my local Mits dealer for E80. Replaced the sensor on the side of the injector pump. Unfortunately, it did not solve my problem. After several days of scratching my head, I found out there was an additional sensor on the top of the pump. I replaced the sensor on top of the pump with the previously removed sensor. My problem is now solved!!

Apparently, as the diesel fuel travels through the engine and returns to the tank it heats up. If the fuel tank is full, then it will take the diesel fuel longer to heat up. When the fuel heats up sufficiently, my problematic speed tachometer sensor would act up and send the wrong signal to the ECU. You could possibly get a engine management code NE Sensor failure.

The link below shows where to find the sensor on the injector pump. Additionally, there is the exact same sensor on top which was the sensor giving me the problem. Each sensor is held on by one bolt.

Do a Google search on "ME203180" and "07046BB". The part number stamped on the old and new replacement part is J5T23282.

Here is another forum that shows someone incredible dilligence is resolving this problem.

Do a Google search "2001 3.2 DID ECU Problem". Look for Pajero Club of South Africa.

Good luck!!

SWB CK · Posted: Wed Jun 29, 2011 15:32 Post subject:

Thanks Jeffrey. I was looking for those part numbers for those sensors. Now it would be easier to buy them online.

BigJock · * Joined: 01 Jul 2011 Posts: 14 Location: Cullen

Just to let you guys know that after 6 months (yes that's SIX months!!!) in the garage the Paj is finally fixed!!

I had exactly the same problem, run fine for 11.5 miles then massive misfiring (due to timing advancing as it turns out). 11.5 miles everytime without fail.

It turned out to be the 2 speed sensors on the pump. Replaced these and its now running like new!!!

I wonder how many people out there end up replacing the entire pump and/or the ECU?!!!
I also wonder about these diesel pump specialist companies replacing and "reconditioning" pumps at great expense? Hmmmm

Luckily I refused to let them replace the pump and ECU.

Mitsubishi garage was completely useless. They didn't even know these sensors existed!

So pass this info on and try this before replacing any pumps or ECU's.

Thank you so much for posting this info guys.

VIKI · Posted: Sun Nov 06, 2011 10:08 Post subject: Re: Fingers crossed