hi its rich again with my troublesome z32....well I got it back from the rip off garage and as instructed put in some new plugs and yes you guessed it its still all over the show...this is what happens..from cold start up its on 5 cylinders ,after say a mile its trying to go on six sort of on off...get to a junction at idle then pull away and its (i guess) down to 4 and really labouring....so i get to the pool go for a swim come out after say 40 mins start her up and its back on six running fine!....after say 2 miles of pushing it abit to clear it? back on five etc.

Please excuse my ignorance but there is a unit beginning with P that supplies the power to the injecters i bought one of luke borg about six years ago and this was put on just before the inj. job could this be the culprit also in the past ive had problems with the loom to the injectors...should this be replaced? any help as always is so appreciated wish i could offer some advice back im a recording engineer if you need some tips! kind regards rich

PTU (power transister unit) is the likely culprit. It's not for the injectors, it's the ignition.

 

CAS (crank angle sensor) is to do with the injectors.

 

Go get a known good series 1 PTU, or even better a series 2.

The PTU you bought of luke, was it a new one (black plastic face) or a second hand one (grey ribbed metal face) if the latter then yep could be at fault, if it's the former then i would expect it's not.

I know on my own from the odd rare time to time i suffer something very similar and it's the connectors going to the coil packs, a little tug and pull and she's all good again.

You can buy injector and coil pack replacement short looms for quite cheap money, now could be the time to do this ( any garage or diy can do) if taht works then great, if not it is still good to have these done as the oldies are failing all the time.

Oh doubt it's the CAS, usually when that fails no injectors will fire and car cuts out or simply won't start.

cheers

smithy

again top advice thanks all.. but now the crazy cow is on six and has been for 6 miles mmm maybe its cleared....no rich thats for lucky people!