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Greetings,

My 1994 VW passat tdi has a problem with a delay in the turbo 'kicking' in. A sensor was loose: the problem persisted. The MAF was changed, it had 15 plus years and over 375,000 kms (231,600 miles). All worked fine for the first 1000 kms; but, the problem has returned. Does anyone have any idea what could be the cause of this?

Thanks in advance...
 

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No, get the car scanned for error codes. Since it's a 1994 I don't know if it uses OBD2 but probably not. You could try this to check for codes:

Turn the key to "on" and pump the accelerator pedal all the way to the floor 5 times in under 5 seconds. Count the number of blinks of the check engine light (CEL). If it doesn't blink at all, try it again or this means this test will not work. The four digit code will be displayed as four counts of blink that will repeat ( **,**,**,*....**,**,**,*...). In this example the code is 2221, Manifold Absolute Pressure control. Note that the blink code is different than the vag-com code (00575).
Blink code 4444 indicates a BK ECU with no faults of those supported.

This doesn't cost anything and I don't know if 1994 had obd2 in Europe. If your car is anything like the US TDI, there's a hose inside the ECU that needs changing: http://myturbodiesel.com/1000q_how_to/a3b4/ecuhosechip.htm In the how to list, it's item #1 because every US spec mk3 TDI will get this problem.

Also carefully go over all the vacuum lines.
 
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What engine do you have? Probably a vac line and if you have the same type of ECU in the 1Z engine the hose inside the ECU is a likely cause.
 

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Discussion Starter #4
No, get the car scanned for error codes. Since it's a 1994 I don't know if it uses OBD2 but probably not. You could try this to check for codes:

Turn the key to "on" and pump the accelerator pedal all the way to the floor 5 times in under 5 seconds. Count the number of blinks of the check engine light (CEL). If it doesn't blink at all, try it again or this means this test will not work. The four digit code will be displayed as four counts of blink that will repeat ( **,**,**,*....**,**,**,*...). In this example the code is 2221, Manifold Absolute Pressure control. Note that the blink code is different than the vag-com code (00575).
Blink code 4444 indicates a BK ECU with no faults of those supported.

This doesn't cost anything and I don't know if 1994 had obd2 in Europe. If your car is anything like the US TDI, there's a hose inside the ECU that needs changing: http://myturbodiesel.com/1000q_how_to/a3b4/ecuhosechip.htm In the how to list, it's item #1 because every US spec mk3 TDI will get this problem.

Also carefully go over all the vacuum lines.
Yes, I have checked for error codes: there are no anamolies. I am on the road currently, but will check the hose inside the ECU upon returning the week of July 26.

I replaced my inter-cooler a couple of months ago, I wonder if there is vacuum hose leak?

Thanks for your help... I shall post an update when I get to the bottom of this.
 

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My engine is the 1Z. The car was built in November 1993. It was the first year that VW put the engine in the Passat. I believe it was in the 1992-1993 Audis.
 
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