sputering rb20

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ok got my car running but it started sputtering in high rpm. if i rev it siting still it doesnt do it any ideas is to this problem.

[mello88]

Could be many things, but sputtering is usually an ignition issue... Such as coilpack(s) failing under load or bad spark plugs.

I would take out all the coils boots and plugs and inspect everything for cracks or fouling.

What plugs are you running and how old are they? Does it ever miss at idle? Codes stored on the ECU? What is your fuel pressure & do you have a FPR? What is your base timing set at?

We need more info...

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it dont do it a idle and i have no fpr yet. and i just put regular ngk plugs. when i first running it ran good havent messd with anything else.

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and anyone tell me the plugs i should get. stock rb20

[mello88]

In addition to ignition issue it could also be as simple as a boost leak. Have you pressure checked your intake pipes yet?

We talk about spark plugs in here at least once a week there must be tons of threads... So for that question I have to say..

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ok ill checkall those. would a exhaust leek cause any problems small one? thanks

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hey mello its running real rich to iam goina have to put a fpr on real soon. ill check the other things. its only doing it at high rpm. want get n boost either. one of my friends said i didnt need one and hes not running one. hes got a sr with walborg 255. i got the same. but he dont like rbs.

[mello88]

Some stock FPRs are shot and unable to deal with the Walbro. Most of the guys here have put nismo or other aftermarket FPR on. They are cheap I would suggest you put one too so you can be sure you have the right fuel rail pressure... And at the same time put a fuel pressure gauge so you can setup the FPR correctly...

Because it's only at high RPM I bet its one of your coil packs... Pull them out and see if one is discolored like it's been arcing thru the boot sometimes.

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ok ill get to it this weekend. i drive it everyday to work and stuf and it does fine untill i turn it up. iam learning bout these motors slowly. but ill let u know bout the coils. thanks

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hey mello got some new plugs runs great now. all the coils looked good. running little rich. iam goina go ahead and get me a fpr. thanks for the help.