A4 1.9 tdi 130 quattro hesitation/misfire

Ian2012

Registered User
My new to me car is misbehaving it has an odd rythmic kind of misfire when you put your down, almost like a judder pretty much happens in all gears, no codes stored car has been remapped according to previous owner. it certainly feels like it.

Any ideas where to start looking?

Thanks

Iain
 

S4_dan

Fire up the Quattro!
VCDS Map User
If no codes and it's been remapped, I'd be looking at either getting the old map put back on or doing some logs via VCDS.
 

desertstorm

Moderator
Staff member
Moderator
VCDS Map User
If you have VAG-COM you could check some of the measuring blocks on the injectors off the top of my head block 13 and block 20.


Block 13 is the injection quantity deviation and shows if the injectors are balanced. Think block 20 shows the BIP values for the injector. Could be something simple like needing anew fuel filter, the injector harness in the head is quite a common failure and would give you those kind of symptoms. Did you buy it like it is now, hope you got a discount ? .

Karl.
 

Ian2012

Registered User
I test drove it and it seemed fine only on the way home today after picking it up have i really noticed it, it has a huge history with it and only done 124k so i hope its not serious.

if run logs what i am logging and what am i looking for?

Thanks

Iain
 

pauldazzle

Registered User
+1 for Injector harness.
 

pauldazzle

Registered User
Easy job. Rocker cover off, undo 2 bolts, unplug the harness & remove, heat the new harness up a bit to make it flexible so it's easy to reinstall ( you'll see why when you do it). It's best to fit a new rocker cover gasket when reinstalling too. Can't remember the torque settings for the rocker bolt's, but you do them up in a spiral pattern like you would a cylinder head.
 

Ian2012

Registered User
ok thanks for the write up i have done worse (famous last words!!!) parts order on monday then.

cheers

iain
 

Ian2012

Registered User
How hot does it need to be will a hairdryer do or more like heat gun?

Thanks for all the replies btw
 

pauldazzle

Registered User
Left mine sitting on a hot engine for 5 mins.
 

Ian2012

Registered User
Well today was a lovely cold and crisp day, got the job done and not as bad as i thought it might be, definately have to warm the new one up and after a test drive it now doesn't miss. The re map that's already on it pulls even stronger now, so thanks to all who helped fix another problem.
 
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