Do we have a solution on the common MAP sensor problem?

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Do we have a solution on the common MAP sensor problem?

Postby lovestriton on Tue Jan 25, 2022 9:55 pm

HI Guys. ML 2008 180k.
Got my map sensor going off mostly on the freeway. Have a ob2 2 scanner. I clear code each time.
Car losses power pull over , turn off / on all good till next time. A day or a week later who knows.

Reading here it seems a common problem , but I cant find much in the way of solution.

Whats the concensus?

I changed the MAP sensor last week, problem still there.
I checked hoses all seem ok..
Cheers
Mike.
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Re: Do we have a solution on the common MAP sensor problem?

Postby DibbyDibbyDJ on Wed Jan 26, 2022 6:04 am

Is you manifold blocked? Is the pipe to the sensor ok?
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Re: Do we have a solution on the common MAP sensor problem?

Postby RHKTriton on Wed Jan 26, 2022 7:04 am

Amazing how much gunk can accumulate in the manifold port and plumbing, esp before EGR is dealt with.
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Re: Do we have a solution on the common MAP sensor problem?

Postby lovestriton on Wed Jan 26, 2022 8:38 am

I will have to check, it has had 2 complete cleans in its short 180k life, last time it looked spotless
I cleaned the pipe by blowing compressed air, using cleaner and a bit of wire to be sure.

I will do it all again I suppose.. I have done it 4 times in the last 6 months..
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Re: Do we have a solution on the common MAP sensor problem?

Postby lovestriton on Wed Jan 26, 2022 8:39 am

Thanks , will give it a clean again.
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Re: Do we have a solution on the common MAP sensor problem?

Postby lovestriton on Wed Jan 26, 2022 10:15 am

Sent the camera down, I don't think it's gunk a build up problem looks like new in there...


Where to next???
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Re: Do we have a solution on the common MAP sensor problem?

Postby DibbyDibbyDJ on Wed Jan 26, 2022 11:43 am

What about the lower part of the manifold? That is where it all collects
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Re: Do we have a solution on the common MAP sensor problem?

Postby lovestriton on Wed Jan 26, 2022 2:33 pm

DibbyDibbyDJ wrote:What about the lower part of the manifold? That is where it all collects

will give it a further investigate. Its hot here today and the car has now become undrivable. The heat plays a part. I went for a 20min freeway ride it went off 5 times in those 20 mins...


I just looked at the logs on the freeway the MAP says its doing 15psi and the sensor then trips at what it thinks it 30psi.. or 60 inHg...

I will pull the whole lot apart and report back..


May need some pro to look at it.
Thanks
Miek
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Re: Do we have a solution on the common MAP sensor problem?

Postby DibbyDibbyDJ on Wed Jan 26, 2022 2:52 pm

Where does the pipe connect to on yours? Is it the upper manifold or on the lower part?
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Re: Do we have a solution on the common MAP sensor problem?

Postby jjj on Wed Jan 26, 2022 10:57 pm

I just recently had to replace my map sensor on my ML triton 205k as it was throwing a CEL and going into limp home mode. Picked up a Toolpro scan guage and found code P0107 Map sensor low. Checked it with the gauge and it stayed at 12inHG while driving, idle and switched off. Got another one from the ebay and all good, measures 30inHG switched off and watched live data and all good with boost. Been 4 weeks without a problem. Also cleaned out the lower manifold vacuum nipple with a piece of wire and used compressed air to clean the 2 rubber hoses and metal pipe.
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Re: Do we have a solution on the common MAP sensor problem?

Postby lovestriton on Thu Jan 27, 2022 7:33 am

DibbyDibbyDJ wrote:Where does the pipe connect to on yours? Is it the upper manifold or on the lower part?

Upper manifold near the top.hose
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Re: Do we have a solution on the common MAP sensor problem?

Postby DibbyDibbyDJ on Thu Jan 27, 2022 3:03 pm

Thats good. It means you have a later manifold.
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Re: Do we have a solution on the common MAP sensor problem?

Postby NowForThe5th on Fri Jan 28, 2022 6:51 am

Showing my ignorance here because my ML had two manifolds - one on each bank of the V. ;)

Was there a different manifold on earlier MLs? Don't remember reading here about one and I've read most posts since 2008.
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Re: Do we have a solution on the common MAP sensor problem?

Postby DibbyDibbyDJ on Fri Jan 28, 2022 3:01 pm

Early 4M41 triton and Pajero had the outlet nipple for the MAP sensor in the lower section, and when they got clogged with soot the port would block up, making things even worse. There was a kit available to blank off the lower port, and with a new top manifold you were able to reposition the port to before the EGR outlet hole.

Still see a few old ones around even now. Did a couple of the kits recently.
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Re: Do we have a solution on the common MAP sensor problem?

Postby NowForThe5th on Fri Jan 28, 2022 8:41 pm

Thanks Dibby. I did a search and found a few posts mentioning the lower manifold position and the replacement alternative. Clearly I wasn't all that interested in those dirty smelly oil burners back in the day. That all changed with the Paj, though. Now the only petrol engine that I'd own would be a V8. :D :D
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Re: Do we have a solution on the common MAP sensor problem?

Postby lovestriton on Sat Jan 29, 2022 5:59 am

I took it to a mechanic these are the codes .
He wasn't sure what they meant.

https://imghostr.net/image/f38AM
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Re: Do we have a solution on the common MAP sensor problem?

Postby DibbyDibbyDJ on Sat Jan 29, 2022 7:20 am

There are no relevant codes there. the P code for stoplamp switch is important, but not related to MAP sensor.

The other U codes are canbus communication codes, which appear on EVERY triton or challenger from that period, and are not showing any faults, its just that the system cannot communicate with ECU's the car does not have.
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Re: Do we have a solution on the common MAP sensor problem?

Postby lovestriton on Sat Jan 29, 2022 7:07 pm

Thankyou that's great information . Very helpful :D
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Re: Do we have a solution on the common MAP sensor problem?

Postby lovestriton on Mon Jan 31, 2022 9:38 am

Ok so I took it to the local diesel specialist.

He diagnosed.
Crank angle sensor has a noisy signal
Leaking injectors
Worn shims or new valve springs, he can't get a stable compression test. If new springs head comes off.
Manifold and fuel line need cleaning
EGR blanking needs removal.

All up about 3.5 k more if head needs doing, and it may need more work but he said he would have to start there.

What do you guys think?
Cheers
Mike
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Re: Do we have a solution on the common MAP sensor problem?

Postby lovestriton on Sat Feb 05, 2022 8:21 pm

Still no joy. But today I got an engine light for first time. Monday of to the mechanics... will keep you posted
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Re: Do we have a solution on the common MAP sensor problem?

Postby RHKTriton on Sun Feb 06, 2022 8:58 am

I'd go and get a diagnosis from a second mechanic.

"Shims or weak springs"?

The 4m41 doesn't use shims - good old adjustment screws.

Valve springs should be able to be changed without head removal. Though with your KMs highly unlikely to be an issue.

Leaky injectors - quality of fuel used in the past could have a bearing.

Your list doesn't inspire confidence that the mechanic has worked on this model engine.


If I was spending the dosh. Start with full manifold clean. The flappy mech at the cylinder inlets could be full of crud.

Crank sensor - check cabling/connector integrity.

Fuel filter and lines - probably should be first item.

Injectors and rail pressure limiter.

Don't be too willing to fund someone's new ARB accessories.
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Re: Do we have a solution on the common MAP sensor problem?

Postby lovestriton on Sat Mar 05, 2022 2:21 pm

Thank you one and all.

Even though the Map sensor was reporting failure, and was replaced, the culprit looks to be the crank sensor.


I noted in the service records, the car had had 2 manifiold cleans in its short life and a manifold replacement from MMC. I suspect the problem was there almost from birth as it was reporting failure at 40k.

Anyway...
I took it to another mechanic who put it on a machine that diagnosed a lot of noise on the crank angle sensor.
Only common thing other mechanic said.

I cannot say it is it 100% fixed only time will tell, but I have run it around for 4 weeks now since replacement and the car idles , starts and runs better. My gut feel is that was it. I have run in hot conditions under load. Even my wife who knows nothing of cars commented how well it was running down the freeway the other day.

I will endevour to report back in 6 months.

Thank you once again for all your thoughts , replies and interest.

RHKTriton, the mechanic I went to second time asked where it had been before, when I told him his responce was, oh he is a great mechanic, did you have to take a bank loan out!


Regards
Mike
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