Smokey JTD Engine! - Alfa Romeo Forum
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(Post Link) post #1 of 14 Old 28-11-10 Thread Starter
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Smokey JTD Engine!

Does anyone know what's wrong with my JTD??

The engine is very smokey at idle speed, and under acceleration. The performance and fuel economy still seems to be ok. On first start up, it takes about a minute for the diesel smoke to become prevolent. (To such an extent that my neighbours have complained!) I have heard that the EGR valve, MAF sensor or turbo pipes might be a possible cause. Can anyone confirm if this is the case, as the parts are typically Alfa Romeo expensive! Thanks.
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Does anyone know what's wrong with my JTD??

The engine is very smokey at idle speed, and under acceleration. The performance and fuel economy still seems to be ok. On first start up, it takes about a minute for the diesel smoke to become prevolent. (To such an extent that my neighbours have complained!) I have heard that the EGR valve, MAF sensor or turbo pipes might be a possible cause. Can anyone confirm if this is the case, as the parts are typically Alfa Romeo expensive! Thanks.
Have you had a new air filter lately, are all of your pipes from air intake to intercooler to intake manifold leak free? Post MAF leaks can cause overfuelling as intended air leaks out before the intake manifold and the MAP didn't seem to be bothered by this on my 1.9Jtd. The EGR usually shows a problem by making the car very sluggish from low revs. There is an anti dieseling valve on the intake manifold perhaps this isn't opening quick enough and the initial overfuelling is causing the smoke but I would have expected smoke immediately not after a minute?? Could it even be water vapour as the exhaust heats up? Someone will have had a similar issue
 
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Has it been serviced recently? Mine became much less smokey after changing the oil, air and fuel filters.
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mmm service first. Then look at hoses. The bottom ones are prone to fail. MAF will bring up the MSCF light so don't worry about that just yet. EGR blockage will cause smokey issues
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Thanks for all your responses! The car had a major service about 500 miles ago, but the problem was just as bad before anyway! I think I'll investigate the EGR valve. Will this respond to cleaning out, or is it likely that I'll need a new one? The reason I ask is that they appear to be difficult to get hold of.
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yes it will respond to cleaning out. Check teh bottom hose first as this will cause lots of black smoke if its got a split
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Find the EGR strip down thread. They can seize up on the solenoid side but tbh it's not that difficult to take them off, strip them down, lube em, clean the "dirty" side and put em back on. £120 is about the going rate online for a new one I think....

Thing is, if the EGR sticks, you lose power as well?.....

Mine's beginning to smoke more than i'd like it to but the power feels good and delivery is smooth and progressive. I have my doubts about the condition of the lower hose though - maybe there's a tiny split or leaky connection on it?
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you could just block it off like I did.
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you could just block it off like I did.
How?
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This is deffo 'smoke' being discussed here I assume?
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wouldnt really advise blocking it off as it could kill the turbo in the future and you would need strong thin metal to block it off as people on here have used a piece of tin from a coke can and this could blow out into the engine and goodbye engine. not really worth the risk, just clean it out properly and thats it. be prepared for blood, swearing, lots of tea and cigarettes and about 2-4 hours work.
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Thanks for all the advice everyone. One more thing.................does anyone know where i can get the turbo pipes for a 2.4? (Preferably some sort of upgraded set) There aren't any currently on ebay, and the specialists I have tried only seem to stock parts for the 1.9.
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Unless you can patch them like I have this may not fit your timescales but look at
https://www.alfaowner.com/Forum/alfa-...-buy-list.html

You could try shop4parts but a quick check didn't return me anything but perhaps with better motivation and knowing what you need.......
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You can't block it off on the 20V without it throwing an engine management fault AFAIK. There is a perforated blanking plate you can get from the dealer to minimise the egr flow though....

tbh, clean and lube it and it won't give you any issues.

lower hose you can get from Alfa Workshop (The Alfa Workshop, independent specialist Alfa Romeo garage and web resource). About 60 quid I think (Samco type)
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