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Premium Member
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Discussion Starter #1
Hi all,
I come there to ask some help about how to find the problem on my car.
The car: seat 1.4 tdi 80cv 2009 : Engine code : BMS (with VNT)
The problem: when the car is hot (say, after 15 minutes of running), when you ask for power in revs, the engine presents some strong hesitations (say two hesitation per second, like a misfire on a petrol engine). It appears also when I want to maintain a relatively high speed (85miles per h). Otherwise, idle is fine, low power evolution are fine also.

The car has no modification, well maintained, 110 000 miles.
VCDS does not show any code (not one relative to engine malfunction at least).
I have test the behaviour of the VNT actuator when cold : no problem, no vacuum leak, very smooth movement. No vacuum leak neither on the other part of the vacuum lines.

--> What other test can I do to find the culprit?
-->Which blocks would you log on VCDS?

Thanks in advance
 

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Super Moderator
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9,329 Posts
If you have a genuine VCDS cable look at all sections with Measuring Value Blocks (MVB).
 

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Premium Member
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4 Posts
Discussion Starter #4
Some news from today,
I have been able to repoduce the phenomenon while logging block 11 (VNT). See file attached. For me, it looks right. Problem does not come from the VNT or the N75. What do you think?
 

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