Adam Madrid
Registered User
HI everyone,
1999 2.5 tdi AFB A4. quattro
This problem is only in cold weather - sub 8C. It was fine over the summer and no problems at all but now the weather has dropped so has my car's happiness.
When I fire her up it starts quickly but immediately is running very loudly and tappety. The revs are not constant and is hunting. There is also a "jump" every 2 seconds which makes me think a misfire? I give her some revs to about 1500 for a minute or two to get her warmed up then move off. The car often stalls at lov revs in gear which makes it a problem as it's an automatic. It can stall a few times for the first 5 minutes or so until she is warmed up. If I rev her all the time using the manual gear selector then she wont stall but in D mode she can stall out at low revs.
When warm she purrs away nicely and has no problems idling at all with no stalling etc.
Any ideas?
I've run a bottle of the injector cleaner through and no joy. It's strange that it happens when cold but fine when warm.
Could it be worn cams?
Faulty injectors?
Glow plugs? but she starts fine and don't the plugs turn off after the engine is running?
1999 2.5 tdi AFB A4. quattro
This problem is only in cold weather - sub 8C. It was fine over the summer and no problems at all but now the weather has dropped so has my car's happiness.
When I fire her up it starts quickly but immediately is running very loudly and tappety. The revs are not constant and is hunting. There is also a "jump" every 2 seconds which makes me think a misfire? I give her some revs to about 1500 for a minute or two to get her warmed up then move off. The car often stalls at lov revs in gear which makes it a problem as it's an automatic. It can stall a few times for the first 5 minutes or so until she is warmed up. If I rev her all the time using the manual gear selector then she wont stall but in D mode she can stall out at low revs.
When warm she purrs away nicely and has no problems idling at all with no stalling etc.
Any ideas?
I've run a bottle of the injector cleaner through and no joy. It's strange that it happens when cold but fine when warm.
Could it be worn cams?
Faulty injectors?
Glow plugs? but she starts fine and don't the plugs turn off after the engine is running?