Post-Cam belt fail - Alfa Romeo Forum
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Post-Cam belt fail


156 1.8ts...

Apologies if I've repeated a million threads I've done my best to check but can't find anything quite the same...

The cam belt went on it before I had it changed (like an idiot!) due to having expensive taste and lack of funds. The car was fine before it went in mechanically. I took it to an Alfa/Italian car specialist in Birmingham but I'm beginning to wonder if he wasn't as good as he sold himself to be...

Basically got the car back from him, was driving it damn carefully down the M6 when I hit 70 and the Engine Management light started to flash. I took it back to him and he said it was recording a mis-fire in cylinder four, he cleaned it out the sparks/coil and resat it and said he couldn't replicate the fault on his test drives so was fixed.

Me and Pa took the coils out and they seem fine. The sparks are due to be changed but really they look fine, although in cylinder three one of the sparks the diode was touching the anode which of course meant no spark... That smoothed the car out (as you can imagine) no end. I'm thinking that is poor mechanic skills to not notice that spark plug!

Anyway the long and short of it is that the car seems ok, maybe the odd flat spot but I don't know if I'm expecting there to be a problem (lost my trust of it), but if I'm on the motorway sat at 70 or so the light will start to flash... No loss of power, no noticeable change, just starts to flash. I slow down to 60 it stops... I know I need to get alfadiag on it which I will do so in the coming days but I assume it is just going to tell me it's a miss on cylinder four.

I've trolled the threads but can't find anything else on this problem only happening at consistent motorway speeds? Obviously I'm going to have to throw more money at it (or get hard line with the mechanic ) but I don't know if it's an issue unrelated to the cam belt work or if simply a change of sparks and coils... Be interested to hear some thoughts in the mean time!

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If it's a misfire then you shoud be able to replicate it with the car stationary. i.e. It will be related to revs, not road speed.

Are the plugs due for renewal - if so it's worth changing them anyway.
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It "could" be an issue with the cam sensor (behind the exhaust cam pulley) - its easy to damage either this or the inner ring on the exhaust cam pulley itself if you are a little careless when doing the head rebuild......

As Sterzo says - its worth confirming that you are talking about an apparent misfire at approx 3500 revs - try running at those revs in lower gears and see what happens...
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