Having a few issues latley. Here are the problems

 

Engine refuses to boost above 3-4000rpm.

Started to show knock sensor error

engines misfires once taken upto 4000rpm.

Temp gets high 99° but then goes back to 80°

 

Fitted a 1mega ohm 2watt resistor in place of knock sensor. Replacing knock sensor isnt a option as im not stripping it all down again.

Done a sniffer test and headgasket is fine.

stop car and restart it and the misfire dissapears.

 

Any ideas please?

Hi,

 

have you done the usual clean all connectors?

what series PTU do you have?

Have you checked plugs and injectors?

The connectors were all cleaned before refitting engine 700 miles ago, but i'll give them another looking at. Ptu is a series 1. Its not showing any other faults other than knock sensor on consult.

 

Is there any chance that the avcr is causing any contributing factors due to it not treading the revs correctly?? I know that wouldnt have owt to do with the cooling issues but maybe the electricals could interfere with the car.

Having a few issues latley. Here are the problems

 

Engine refuses to boost above 3-4000rpm

 

This can be a sign of boost leak, as the tubs demand pressure the vacuum will block the seal until it requires pressure to overcome vacuum.

 

engines misfires once taken upto 4000rpm

 

This can be mis-understood as boost leak, quite an easy mis-conception.

 

Just my thoughts/ideas..........

 

Alz.

Edited June 8, 201213 yr by AlanZ

Will do a boost leak test in morning and see what outcome is.

The misfire continurs on after the revs have dropped. But restart engine and it dissapears.