Please help jtd-mjet power loss - Alfa Romeo Forum
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(Post Link) post #1 of 11 Old 28-09-12 Thread Starter
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Help Please help jtd-mjet power loss


Starting to lose the rag with my car!
I have a alfa 1.9jtd m-jet that is just doing my head in!
The problem is that i have no low rev power below 2500 revs but ok after 2500.
Ive read all the forums and done most of what has been advised to other people with simalar problems. So far this month i have done the following;

Removed and cleaned egr valve (this made the biggest diffrence)
Replaced the MAP and MAF sensors
Removed all turbo hoses cleaned and checked for splits all ok and i replaced the 6mm small pipes coming from turbo going to valve on top of radiator.

The most worring thing to me is the fact that i have removed and cleaned egr valve x3 in the last 3 month and it is always full of sute. The throtle body where the egr vave was full of oily gunk, all down the air pipes going to the intercooler was also full of this gunk, the intercooler had oil running out the bottom of it when i had taken the turbo pipe off. I asume this is not normal Strange thing is that the car isnt loseing oil?
If anyone can give me some advice or help i would be most greatfull.
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hi mate replaced my lower turbo pipe it look ok but was covered in gunk ,cleaned it, it looked ok, trouble is when car is on boost any little pin hole will result in loss of power. Check your hoses again after you cleaned and replaced them if they is any gunk on them replace them its about £60 for a new one worth it.Get a remap and EGR delete that will solve a lot of your problems I did worth every penny
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(Post Link) post #3 of 11 Old 29-09-12 Thread Starter
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Thanks for the advice m8. Before i spend £60 on a new one, if i tightly taped up the pipe with silver duct tape would that seal any small splits or holes? What do you mean by EGR delete? Do they remap is so the EGR doesnt get used? Cheers pal.
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Yes you can do a remap that will tell the ECU not to open the EGR valve
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Power loss below 2500 revs is typical of a stuck open ERG or the vacumn line to the VNT is leaking.
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The small pipes you mention going to the VNT should be replaced with 5mm and 3mm, 6mm is too large. Unless they fit tight they will leak and the problem will not go away. I know, I've been there!
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(Post Link) post #7 of 11 Old 02-10-12 Thread Starter
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Thanks everyone for the usefull advice much apreciated. Does anyone have a idea why all the gunky oil is everwhere ?
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What sort of distances are you driving - if lots of short start/stop runs the engine will not get up to tempreture to burn off all the soot and other rubbish, and hence it will get full of gunk.
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The inlet manifold is probably full of the stuff, mine was so bad the butterfly valve couldn't shut and the engine would shudder when shutting down. Ccaused by a combination of oil from the turbo (normal) and carbon from the EGR (also normal unfortunately). It's made worse as CJO says by slow driving and short trips.
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Check your injector correction values with Multi ECU Scan. If any are more than +1 or less than -1 they might be the cause also. Just had two of my injectors reconditioned and power is back.
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(Post Link) post #11 of 11 Old 03-10-12 Thread Starter
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Cheers for the info guys its mostly to work & back 50 mile round trip on m-way.
Cars now behaving quite well & 90% of the power has been restored. Cheers again for the info this forum is cracking for loads of tips & advice big thumbs up
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