I have just finished fitting a new cam belt/water pump etc and when I started it up it sounds as though it is misfiring.

When I checked the exhausts there was more pressure from the drivers side exhaust that the passanger side.

No smoke or anything.

I am going to put some new spark plugs on it to see if that is the problem but has anyone else got any ideas why it might be running rough.

It was running fine before I did the cam belt.

Oh dear, I hope you got the cambelt back on properly i.e. not a notch or 2 out

No cambelt is fine, I checked it several times and got a friend to check it as well, all the markings lined up correctly, I have read about power loss etc from 1 tooth out so made sure it was right.

Doubt it has anything to do with spark plugs as they were fine before the cambelt change (that's not to say it's a bad idea to change them for a fresh set ...)

 

It is more likely down to either a bad connection on the ECU water temperature sender (ie the yellow connector on the water pipes at the front of the engine) or even a break in one of the wiring harnesses (could be the from the water temp sensor or even a coilpack/injector if they were disturbed during the cam belt change).

 

I suggest you have a look at the yellow water temp connector and make sure it is (a) not corroded on the inside and (b) seated correctly.

 

HTH

 

Dan

as dan said, water temp sensor probably, easy job and well worth doin even if its running fine.

No cambelt is fine, I checked it several times and got a friend to check it as well, all the markings lined up correctly, I have read about power loss etc from 1 tooth out so made sure it was right.

 

you should count the teeth between the pulleys rather than rely on the markings...

Doubt it has anything to do with spark plugs as they were fine before the cambelt change (that's not to say it's a bad idea to change them for a fresh set ...)

 

It is more likely down to either a bad connection on the ECU water temperature sender (ie the yellow connector on the water pipes at the front of the engine) or even a break in one of the wiring harnesses (could be the from the water temp sensor or even a coilpack/injector if they were disturbed during the cam belt change).

 

I suggest you have a look at the yellow water temp connector and make sure it is (a) not corroded on the inside and (b) seated correctly.

 

HTH

 

Dan

 

I have already fitted a new ECU temp sensor a couple of months ago, its also has a new s2 PTU.

I did fit new PCV valves at the same time as doing the cambelt and I fitted the cambelt as advised on ttz.com and threads I have read on this forum, I am confident the cam belt is lined up correctly.

I am going to check all the elec connections this morning to see if I have knocked something whilst doing the cambelt.

Sorted it out today, after pulling all the plugs and coils managed to find one of the rear plugs was not sparking, checked the coil was ok and then managed to trace the problem back to the PTU.

It was a bad connection between the new PTU connector and the old wiring, its still not a great connection so I am going to cut out both connectors and hard wire the PTU instead.

I don't know if its the new PCV's/spark plugs or just general service but its going great.

Next job is to find a new (non rusty) hatch to replace whats left of mine.

Funny you should say that. Saw this thread and after reading the first post, I thought it's the PTU connected to the cam belt covers.