Evening all,

Having problems with my 4X4 Sapphire, I've had my T34 rebuilt as the bearing let go in it since I've put it on its developed a misfire as soon as it comes on boost, it drives absolute mint pootlying around but as soon as I put my foot down and the boost gauge hits one bar and it's starts misfiring.

Even if I feed the power in it still does it.

I tried a fresh set of plugs in it (071's) just to see if it would help but no joy.

Any ideas people? What have I done!!?

Starting to pull my hair out with it and all I want is get out and use it.

Cheers, Oli.

 

What psi is it running, did you clean out all the boost pipes and cooler?

 

what map sensor are you using ?

 

Also what is your fuel pressure? I had a rising fuel rate regulator, and it over fueled at boost, causing a misfire

 

Make sure gaps on tdc and phase sensor are right

 

Duff actuator.

 

CPS- Does you red engine management light come on? (Or is this light only on a 3 door?)


Tim.

 

It's only on a 3 door.

 

personally Id bin the plugs and put something else in. Ive had loads of trouble with 071's causing poor running and misfiring on boost. Im either unlucky and keep getting dodgy ones or there are a lot of duff plugs out there. Not just on one car either, several mates have had issues too.

 

Check the multi-plugs on the bulkhead, these can cause sudden strange ignition problems.

 

If the turbo let go before the there will oil in all the pipes,cooler and exhaust.It should not make it misfire but it will smoke its bag off until its all burnt away.

I took everything off and cleaned the lot out with petrol.Still smoked for donkeys.

Make sure as your plugs are gapped correctly,what boost are you running?.

I used BGK bkr9eix gapped @ .65. with a grpa coil .22psi and only ever suffered one misfire but that was old plugs.

 

Close the plug gaps bud - it's a quick and easy one , could be a simple fix for you .

 

I always used NGK BCR8ES even on a standard coil and doing 36psi on a T34 i had no missfire issues from them at 0.6mm plug gap.

Worth giving the pipework, cooler and TB a clean if they are oily too.