Some misfire on boost

Vlade · Post by **Vlade** » Fri Aug 22, 2008 6:39 am

Well the car was running so great... but you know being an SX it have to let you know every now and than that its still an SX

I've got a misfire intermittently on boost, initially I thought it was because the car is cold... now it happened when the car at operating temp. It sounds like I'm hitting the limiter when the car comes into boost, and that is not gunning it about 50% / 70% throttle...

Haven't checked anything, will check plugs and coils tomorrow afternoon, got a slight suspicion its the fuel pump.

Any ideas what it can be?

widowmaker · Post by **widowmaker** » Fri Aug 22, 2008 7:32 am

actuator circlip?

Gary57 · Post by **Gary57** » Fri Aug 22, 2008 8:23 am

Plugs.

rat · Post by **rat** » Fri Aug 22, 2008 8:28 am

Fuel Pump, check the pipes in the tank as well.

Sokar · Post by **Sokar** » Fri Aug 22, 2008 8:42 am

Check compression in cyl 3, oh wait, its not an SR20

Vlade · Post by **Vlade** » Fri Aug 22, 2008 8:56 am

haha...

No the misfire seems to be across all cylinders, like I said it sounds like I'm hitting the limiter when the boost comes in...

Gary57 · Post by **Gary57** » Fri Aug 22, 2008 9:27 am

PLUGS!!!

What is your charge and discharge time??

veecee · Post by **veecee** » Fri Aug 22, 2008 12:41 pm

that depends on how old you are...

as you age your charge time takes way longer while your discharge time happens very quickly!

Slide 'em Wide · Post by **Slide 'em Wide** » Fri Aug 22, 2008 12:44 pm

n1smo200sx · Post by **n1smo200sx** » Sat Aug 23, 2008 9:14 am

plugs or CAS

Toby · Post by **Toby** » Sat Aug 23, 2008 10:35 am

I think you neglected to mention the backfire. That suggests no spark or overfuelling. Maybe there's a problem with MAF sensor or the fuel map in your wolf ECU?

Vlade · Post by **Vlade** » Sat Aug 23, 2008 5:34 pm

Backfire? Did you see any backfires

Toby · Post by **Toby** » Sun Aug 24, 2008 8:43 am

Doesn't it make a loud bang as you get on boost at full throttle? Or is this now different to the problem you had during the Durban trip?

Slide 'em Wide · Post by **Slide 'em Wide** » Mon Aug 25, 2008 10:24 am

Hey Vlade, Check your boost pipes from the turbo. If there is a leak then your motor is expecting more air and basically just over fuels and miss fires. I experienced it this weekend.

Gary57 · Post by **Gary57** » Mon Aug 25, 2008 11:43 am

Hey Vlade, Check your boost pipes from the turbo. If there is a leak then your motor is expecting more air and basically just over fuels and miss fires. I experienced it this weekend.

He runs a MAP sensor so this wont happen.

Have you checked the PLUGS??