ABY engine chucking when driving - Possible Causes ?

[macspring]

As per above, car has started to now chuck a bit when driving it. It pulls cleanly and the chucking is "masked" by going to WOT.

Most stuff on the car is fresh / new, so looking for any ideas as to what might be the cause.

Would be nice to cure it, as I want to get to the bottom of it's limp mode, amd also to repalce the brake servo.

Thnaks for any assitance / suggestions.

[Christophski]

What do you mean by chucking?

[macspring]

Hesitating / missing. Engine pulls fully under wot, but one can easily feel it missing as one drives. It's a bit random in any short journey.

[irishs2]

It probably wont be much help, but whats the condition of the earth strap? Could it be loose, and engine movement on WOT is enough for good contact?

[Christophski]

Someone once said Knock sensors when I had something similar years ago? Alternatively is it a coil or something of the like?

[re2500]

Check your spark plugs are done up. One may have worked loose. It wouldn't be the first time.....

[Rusty]

VAG com time

[here2learn]

mine did this it ended up being ht lead, i just got a water squirt bottle and misted the lead which highlighted the short

[macspring]

Update to this thread:

Changed from the recommended Bosch spark plugs, ( F5DPOR ? ), to NGK spark plugs, and it's cured the "chucking" and also the over boosting and then going into limp mode for a while until the next WOT after and few minutes, and then again limp mode for the next WOT a few seconds later.

I know it might seem extraordinary, but it worked for me, so if you have any issues or want to prevent any, consider putting in the NGK BKR-7EIX iridium. The stock code is "2667".

They cost me approximately €11.00 each, not sure if that is dear or not, but worth every penny for me this time.

The white ceramic on each the Bosch spark plugs was a deep plum red colour, whatever that indicates ?

This thread made me do something about the Bosch plugs, as my engine is a fresh JP engine, but no one wants an engine to "kill" itself for the cost of a set of spark plugs.

http://www.s2forum.com/forum/showthread.php?t=56638&highlight=spark+plugs

Mcandmar, these plugs may help your engine ?

HTH someone.