JTD MAF query - Alfa Romeo Forum
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(Post Link) post #1 of 11 Old 17-06-13 Thread Starter
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JTD MAF query

My 156 2.4 JTD (2004) developed the usual symptoms of MAF trouble (lots of smoke at certain revs and strangled acceleration) so I disconnected the MAF (thanks to advice I found on this forum).

Without the MAF connected the car runs really well but with that annoying "Take me to your dealer" message.

So I bought a secondhand genuine Bosch MAF from a spares place and it was no better than my old one. They replaced it and the 3rd one is just as bad.

Q1. Is that just bad luck? Should I have bought a new one? If the car runs well without the MAF is the problem definitely the MAF or could it be, say, the ECU or something else?

Q2. My MOT is coming up fast. Can it pass with that dashboard warning message flashing up?

Thanks guys,
Paul
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Have you tried cleaning out the EGR too? Seems myself and a lot of people find the two issues occur at the same time (less smoke with the EGR though), personally I think the MAF issue causes the EGR to fail.
Slip a think piece of metal (eg from a drinks can) under the EGR and see if that helps.
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(Post Link) post #3 of 11 Old 17-06-13 Thread Starter
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No I haven't tried that because when I disconnected the MAF it runs fine. So I assumed that the EGR was ok.
That may be a wrong assumption.
It can't hurt to clean it I guess.
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3 mafs in a row sounds too unlucky, you could look for any splits or holes in you turbo inlet pipe from maf to turbo, breather pipe and vapour trap pipe also, any air that leaks in after maf would give low maf reading also.
Anyone near you got multiscan or similar to look at actual maf values?
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(Post Link) post #5 of 11 Old 18-06-13 Thread Starter
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I'll try to have a look for split pipes - good idea. No I don't know anyone with a multiscan but I was thinking of getting one.
Thanks
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When was the last time the air filter was changed? And... By who, yourself, dealer or indie?
 
(Post Link) post #7 of 11 Old 20-06-13 Thread Starter
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The air filter was changed just under 12000 miles ago by indie dealer - an Alfa specialist.
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Originally Posted by Beechers View Post
The air filter was changed just under 12000 miles ago by indie dealer - an Alfa specialist.
Thanks
What's the condition of the airbox lid, has it lifted or broken the lugs at all? Depending on how long 12,000 miles has been in terms of time, it should be still able to be removed and inspect the bottom of the airbox for debris that can be contaminating the mad. Sometimes when an air filter is changed, some mechanics theme to forget to vacuum our the debris before fitting a new filter
 
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If it has done just under 12,000 since the last service then it should be due another one very soon - service interval is a little over 12,300
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(Post Link) post #10 of 11 Old 25-06-13 Thread Starter
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Yes it is just due for a service now. I checked the airbox - not much debris but I cleared it out.
One of the self tapping bolts is missing so I'll try to get another. The lid was pretty well secured though.
HOWEVER, I found a split in the intercooler pipe, so I will definitely replace that.
I did a quick search on the forum and others seem to have the same symptoms of smokescreens with the split pipe so here's hoping.
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See.... if you didn't check the airbox, you would have been searching for a cause for the smoke for days.. Good work mate
 
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