Flat spot on acceleration. No fault codes. Lambda sensor and coilpack replaced before I got to scene.

Scoped both throttle sensor and MAP, all seems OK (But tried new MAP just incase)

On driving round the block the "Lurch" always seems to take place at about the same place (So it is linked to specific load/speed conditions)and it is possible to drive through it.

(the rev counter needle stays steady during the lurch)

I cannot reproduce the symptoms simply by reving the engine while stationary

ISTR that there were some ECU issues on these but cannot seem to find any info.

Any suggestions??

What are the KV readings?

How long are the burn times?

Mark

Hi Paul,

What spark plugs are fitted to this? I have assumed there is nothing wrong with emissions and fuel trims etc. Any history behind it? Assume it drives ok otherwise.

Regards

Pete M

I will check the various suggestions when I get back to it in the next few days.

The car has been misbehaving for some time and has been "Played with" by several others before I got too it!

I will check coils/plugs in more detail when I see it again

Thanks

Paul

Hi Paul
We seem to remember a similar fault on a 106 which we traced to the camshaft key-way broken and also a bad ecu not reading the map correctly.
Cheers Mick.