Rb25det Misfire?

[evan b]

Hey guys im new to skylines australia and I know this topic has been touched many times however I havent been able to solve my problem so any advise would be much appretiated.

I have a r33 which has a ecu modifyed by sam at dr drift so the afm is located between the intercooler and the inlet plenum anyhow I have had a lot of problems with the intercooler pipe blowing off at the afm (which I think is where my problem first started) so I welded a couple of tabs on each pipe and ran a bolt on bar beside the afm to stop it from seperating, once all that was done the car now seems to have a misfire mabe? it runs a little rougher than normal at idle but seems fine to drive untill you hit boost where it coughs an splutters etc on occiasion it will boost in second gear but it over boosts.

I think the fuel pump is fine as its new and it pumps a bit of black smoke out the back while its playing up and also I have tryed a bunch of things to rectify the problem which includes- cleaning fuel filter etc, carn't find any vacume leaks, new spark plugs, pulled the coil packs off my rb26 and tryed them ( splitfires where on the car), inspected the coil harness and added an extra earth, cleaned earth's on motor, tryed a second ignitor,afm & tps, the wastegate was sticking a bit also but have since cleaned around the valve and flange so it now moves freely, I also hooked it up to the consult cable and it shows no erra's though the tps ( first one) was running at .80 volts so adjusted that to 0.45 v.

So as you can see ive had enough of this f**in pice of sh**t so if anyone can help me out here it would make my day.

[PIOTREK]

wow normally these issue are resolved by new coil packs! sounds like you have tried everything

[trance]

misread the post.. nothing to say lol

edit: have you checked out the o2 sensor? also, try a self-clean on the afm just incase :S good luck, sounds like a challenge

[paulr33]

check the AFM value during driving on consult

because its been blowing the pipe off you may have physicall damaged the hotwire, its a simple wire after all

[evan b]

check the AFM value during driving on consult

because its been blowing the pipe off you may have physicall damaged the hotwire, its a simple wire after all

Will do mate, when I take a look at the car next its on its second afm though which im pretty confident is in good working order, its gota be somthing like that ive over looked.

[evan b]

Hey guys just thought id run some thoughts past ya,

When the car does boost I carn't hear the wastegate so much yet the boost guage say's the inlet manifold is seeing 22psi which it should be 18psi the wastegate has a 15psi spring in it which leads me to beleve this could a plenum leak, I had allready checked for this but only visualy inspected pipes/hoses etc so are there any suggestions for like a leak down test or something effective without striping everything down?

Cheers

[evan b]

Might have a look at the car this weekend I also noticed it has a slight manifold leak though I wouldn't think it could cause the car to play up this much could it? the engine also seems to be going through huge amounts of fuel is well so im still a bit confused as to what the problem might be?

so come on fella's the more infomation I can get the better im sure some one has had similar symptons any input is always appretiated cheers.