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Old 01-25-2020, 06:05 AM
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My 02 3.0d auto always sluggish

I am very stuck on what the problem is with my car being slow? The odd day I take it out and it's really fast and feeling free and light, other days I feel I am revving the balls off it to go.
I've checked pipes, manifold doesnt seem to be blowing or cracked. Got a new one to fit anyway. I don't hear my brakes sticking, and no my handbreak isn't on. Lol
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Old 01-25-2020, 06:28 AM
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Twice in recent months people have reported similar and the vacuum system that controls the boost was at fault
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Old 01-25-2020, 09:56 AM
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Would it not throw a code though?
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Old 01-25-2020, 01:23 PM
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Don’t think so just didn’t reliably give boost


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Old 01-25-2020, 03:59 PM
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I've fitted a boost gauge and it shows it is boosting?
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Old 01-26-2020, 12:36 AM
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Try driving in manual shift mode. Maybe transmission is early shifting and you are out of the power band?


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Old 01-26-2020, 04:57 AM
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Quote:
Originally Posted by andrewwynn View Post
Twice in recent months people have reported similar and the vacuum system that controls the boost was at fault
+1 on this. While I've need seen this exact fault on an BMW M57, I have seen it on other brand diesels - the vacuum modulator that controls the VGT actuator becomes intermittent.

It's easy to test with a vacuum pump...



Also, VGT turbos are know to coke up and cause these symptoms, when the vanes become foulded and cannot move freely.

The above vacuum test sort of check this too, as you can see the actuator arm on the turbo more (or not).
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Old 01-26-2020, 07:44 AM
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Will try both the suggestions. I've so many issues that need fixed and I really want to keep it.
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Old 01-26-2020, 03:27 PM
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There's a number of issues that can cause your symptoms but you gotta start somewhere!

EGR system, clogged intake manifold, failing injectors and fuel pumps systems (pressure regulators etc.) are all possibilities. Many of these will throw codes though.

Ever checked the engine breather?

I doubt your exhaust manifold is a problem - the pre-facelift cars had cast manifolds that never give issues - it was the facelift cars (LCI - 09/03 until 06) that had the stainless manifolds that crack.
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Old 01-26-2020, 03:46 PM
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I am still holding 15psi and still pulls when I want it to, but normal exeleration it's slow and noisey
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