Diesel engine trouble

[just_william]

Hi all
I have a 406 turbo diesel 1.8l (99) and at the moment I can cycle quicker. If I put my foot down there is quite a bit of smoke coming out the back but you can only see it at night with headlights behind so can't see what colour it is. Went for a full service 500 miles ago and nothing found wrong. Only brings home only 42 MPG as well on 50 mile daily comute. Not expecting a rocket ship but....
Done 100,000 miles with FSH. Could it just be a tune at Peugeot.
Any thoughts appreciated.
Jim

[Sparks]

Sounds like an air mass meter failure. I had the same on my Saab. It is a rather expensive part, but replacing it made my TD much better.

The engine cannot determine the amount of air going into the engine, so the ECU basically runs in 'limp' mode (won't rev past about 3000 rpm and no power).

You could try looking for it, and cleaning it, but be very careful. You need a solvent spray (carb cleaner?) and for my Saab at least, there is a fine crossed wire in a unit after the air filter.

HTH

Sparks

[motorwise]

Sparks said:

Sounds like an air mass meter failure. I had the same on my Saab. It is a rather expensive part, but replacing it made my TD much better.

The engine cannot determine the amount of air going into the engine, so the ECU basically runs in 'limp' mode (won't rev past about 3000 rpm and no power).

You could try looking for it, and cleaning it, but be very careful. You need a solvent spray (carb cleaner?) and for my Saab at least, there is a fine crossed wire in a unit after the air filter.

HTH

Sparks

sounds about right to me too - try a run with the MAF unplugged and see if some of the performance returns - if it does you've probably found your culprit

[just_william]

Cheers guys, the car does actually rev right up the full range and plods along at 95 if wound up but the revs do seem OK although just a little slow. I'll have a check through my Haynes though and see if I can find it.
Cheers

[cptsideways]

Has it actually got a turbo?

[apache]

I had a smilar loss of power on the Passat when the intercooler pipe came adrift, check for splits etc

[just_william]

I'm not an engineer to say the least but there is def a whistle in teh background so would assume the turbo is OK. When it ever stops bloody raining I'll have a good nose under the bonet. Cheers

[cptsideways]

just_william said:

I'm not an engineer to say the least but there is def a whistle in teh background so would assume the turbo is OK. When it ever stops bloody raining I'll have a good nose under the bonet. Cheers

You might have a boost leak from one of the interheater, sorry intercooler hoses,

Post a picture up of your engine bay to confirm

[just_william]

OK have to give me a wee while top sort that out! Hopeless with cameras also!!

[MR2Mike]

just_william said:

I'm not an engineer to say the least but there is def a whistle in teh background so would assume the turbo is OK.

Either a split boost hose or a burst intercooler (if fitted) would give all the symptoms you describe and would also tend to make the turbo whistle louder. By the way, a '99 406 would either have have had the 1.9L XUD engine, or the newer 2.0L HDi engine. It was never fitted with the 1.8 XUD.

[apache]

One other point the intercooler can get full of oil so that is another area to check

[combemarshal]

Is it not the 1.9 XUD9TE Engine in that, same as the Xantia 1.9td?
If so sounds the same as when mine popped a pipe off, Simplest thing to do is to disconnect an easy to get to pressurised pipe and see if it makes a difference

[just_william]

406 LXTD is actually on the reg doc and yea your quite right its a 1.9l will try thing you guys suggest. Cheers