misfire on 1.9 tdi

[carljason]

Hi
ive got a 05 Altea 1.9 tdi which has the symtoms of a misfire, on medium revs slight engine strain you can feel the misfire and puffs off smoke out the back, ive just changed all the filters and oil.
fitted a new maf senor as the that faulty about 2 months ago
the VAG is showing a glow plug fault but i wouldnt of thought this would cause the misfire
any ideas?

 

[volvic]

without the glow plug the cylinder wouldn't fire(as the cylinder wouldn't reach correct temp for combustion). once the engine is warm the plugs are not used (as far as i know)

best bet would be replacing the plug!

 

[carljason]

the car starts fire the misfire is only when hot

 

[Viking]

Glowplugs only actually work when the outside temperature is down towards freezing point. You may have a faulty glowplug but that certainly isn't your problem here.

Is your misfire round about 1700 2200 rpm by any chance?

 

[glynnd]

EGR VALVE !
Glynn

 

[TornadoRed]

Hi
ive got a 05 Altea 1.9 tdi which has the symtoms of a misfire, on medium revs slight engine strain you can feel the misfire and puffs off smoke out the back, ive just changed all the filters and oil.
fitted a new maf senor as the that faulty about 2 months ago
the VAG is showing a glow plug fault but i wouldnt of thought this would cause the misfire
any ideas?

The glow plug fault is a red herring -- it has nothing to do with your problem.

This sounds like a possible injector issue. If you have a pumpe-duse (PD) engine, then it might also be a cam lobe problem.

 

[carljason]

yes the misfire is between 1700 2000 rpm

 

[James_R]

There's a software update thats supposed to solve this problem. As glynnd has pointed out its a fault with the egr valve, more specificly the activation programming.

That or its the injector loom or in very rare cases an injector.