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Leaning Out Help.

RPR33

By RPR33,
in Engines & Forced Induction

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  • 6 months later...
RPR33 Community Regular

RPR33

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nah not yet but the fuel pressure was all good when we tested it I have put in an safc2 so I can watch for knock... it just hard to look at cause it doent always happen just every now and then! or it will happen like five times then clear up?

BezerkR32 Veteran

BezerkR32

Posted
Posted

the dyno sheet would show if it was actually leaning out, otherwise you are guessing. if it does show this then the things to check have already been mentioned, otherwise get someone to look at it before you break it.

yeah I would guess a fuel pressure problem - put a gauge on it and make sure you are not short of flow up high. dying fuel pump, fuel pump wiring, blocked filter etc etc etc. some of the jap ecus are a bit leaner than we like but they should not be causing it to ping all the time
MBS206 Grand Master

MBS206

Posted
Posted

Check your TPS.

If it isn't working properly, then you will lose the throttle enrichment, hence, a lean out when you first step on it.

Also, earth the fuel pump as mentioned.

Throw some new plugs in it gapped at 0.8mm

heller44 Mentor

heller44

Posted
Posted

Clamp the return from the fuel rail, that will tell you if the pump can't keep up or the fpr is screwed.

I had the exact same symptoms, mine was a torn diaphram in the fpr so it was leaning it off all the time, as well as a fuel pump with ~10v at it when at full throttle.

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