Vt engine misfiring

[96calais]

Hi everyone!! When I bought this car it had this very issue, I replaced my plug leads with good quality ones and that fixed the misfire. Now it's back as of yesterday, should I replace plugs then coil packs to see if that fixes the issue?

Starts to misfire at 80km and up hills under decent acceleration, if I accelerate very slow it seams to be ok

 

[EYY]

Try replacing your plugs first, then coils, then try the dfi module.

Has the fuel filter been changed since you've owned it?

 

[96calais]

Plugs are going in this arv, I bought ngk and the ones in the car are champion rs9yx6

 

[96calais]

New plugs installed and problem is still there

 

[96calais]

Just did the coil pack test, took the first two leads off coil and looked for strong spark, all three coils looked good.

If I push the accelerator slowly and rev it the engine sounds smooth as, if I go full throttle from idle it misfires straight away off idle. I've plugged in my autel analyzer and can find no faults at all

 

[commodore12345]

Fuel injector possibly lacking.

 

[96calais]

Ok I've tested all my leads which are only a few months old and they meter all ok, a friend and I tried several different coil pack and dfi modules and same deal, also cleaned the maff sensor and tried another throttle position sensor ( one that controls the idle) still no luck.

Engine has no problem until you put ya foot down then it starts to miss, if I accelerate slowly it's perfect and on the highway.

Just put some risolene injector clean in her to see if that helps

 

[billythakid]

Did you check the plug gaps before fitting ?
You can test a plug with a multimeter between the top and the thread , if it reads anything it's a dud. Can't remember if it's volts or ohms though

 

[billythakid]

http://youtu.be/-vdC2rwclGo
This way

 

[96calais]

Yes gapped the plugs at 1.5