Lean Or Spark Problems?

[Kwyjibo]

I'm currently putting together an RB20 with a HKS 2530 and injectors/fuel pump/fmic/z32 AFM/eManage Ultimate. I put the new turbo and FMIC on and have taken it for a test drive to make sure I didn't break and it seemed to work ok(slightly laggier than expected). I'm not expecting it to run properly without a tune and the new injectors/fuel pump but I got a very bad misfire at just under 5000rpm at 10PSI.

Is there anyway to test if this is due to lean out or whether its a spark issue? I don't wanna waste money getting new coils if I don't need too but if its a lean out issue then that won't be fixed until the tune, and I want it all together by the time I get it tuned.

Edited May 17, 2009 by Kwyjibo

[RRob]

Being excessively rich will cause misfire issues.

[NYTSKY]

Go and get it tuned FFS.

Thats the only way you will know for sure.

How can you possibly expect the engine to function correctly after all those mods.

Next you will be posting "Why did my engine blow up?"

[Kwyjibo]

Ummm, if you read my post you would understand that I took it for a TEST drive to ensure the turbo and FMIC was running smoothly(no other mods have been put on yet). I was just wondering if there was a way to tell whether I will need new coils or not BEFORE I spend $700 on the tune I am going to get before I blow my engine. Hence where I said ''I'm not expecting it to run properly without a tune and the new injectors/fuel pump''

I understand there are a lot of fairly clueless people on here but I clearly stated in my first post that my plans are to get a tune and I know my car is not going to run properly until then, and it will be off the road until then. I like to test the car inbetween each mod(obviously I won't be able too with injectors and AFM) to ease troubleshooting in the long term.

I just wanted to know if there is an easy way to tell the difference between the misfire so I don't have to take the car out again till its tuned.....

Please read my full post next time before posting, anything resembling and answer to my question would have been nice as well.

Edited May 17, 2009 by Kwyjibo

[NYTSKY]

The only way to diagnose it properly is to get on the dyno.

Simple.

Im sure the tuner knows more about this sort of stuff than you do.

If you think its coils, get some coils off another car that you know are working and test. Check for any boost leaks ect

Other than that you cant do much until you get it on the dyno.

And of course its running lean, you have just put a bigger turbo on that flows a hell of a lot more air than stock the ECU cant feed enough fuel to it.

The ECU is most likely hitting R&R.

Clueless people indeed.

[Kwyjibo]

Thank you thats what I thought. I will just buy some coils as mine are getting old anyway.

I'm not clueless, I just don't have a lot of knowledge apart from what I read on here, which is why I ask so I can learn these things. No need to be rude about it.

I know it would be running way too lean and well above the current tune(even though I'm running way less boost than before), but as I stated all I wanted to know is if there is a way to tell the difference between misfiring due to learning out, or misfiring due to ignition issues.