Leannnnn at wot

[kurupt305]

Went for in car tune yesterday in my 05 at wot between 1-2 car seemed to not want to shift and was bouncing off rev limiter got 18 afr super lean now in second and third at wot car would jump str8 to 16-17 but drives normal under normal conditions ie 14.7-15 afr could it be that my fuel pump suction line might be pinching or closing under high demand of fuel? Anyone ever experience this ? Today car drives great in first and 2nd

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[Overkill]

Rev limiter cuts fuel injectors, will show very lean on the wideband. Fix what's required for the vehicle to not hit the limiter for starters.

[Fivefingerdeathpunch]

How high is it shifting?

[darkhorizon]

misfire... pretty obvious one here guys.

[kurupt305]

doesnt miss at idle whats funny is it worked fine all day yesterday i guess it went away but what i notice when i shut the car off when the problem is occuring i notice that when i shut the car off it kind of sputters for a split second im wondering could this be a sign of my pcm going bad ? and my rev limiter is at 6200 shift point with an xp cam with 105 springs and retainers remember its an 05 so not sure if electronic throttle body has anything to do with it and its on a lq4 maf

[kurupt305]

Need some positive help my car runs great at night when cool mind you I live in south florida cool is 70 today its been 90+ DEGREES CAR NOW at wot goes pig lean 17+ at wot after cars very hot what could be the issue ?
Maybe have to tune in the heat instead of cool night? Car is a 05 gtp

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[kurupt305]

Car only does it after being run hard and when gets hot

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[Fivefingerdeathpunch]

Clearly you must be scanning right??, view both scans see what's different.

Maybe veiw stuff on a scanner to see WHY it's doing that. Like injectors duty cycle for whatever.

Check fuel pupm pressure, maybe it's dying.


The car is smart enough to know what to do with 20+ temp swings, thats not your problem here. It can pulling timing based on ECT and intake temps aswell as adjust fuel.

[kurupt305]

Going to hook up a fuel pressure gauge and see if pressure drops when car goes lean to see if its my pump which is brand New its zzp 350 not sure what brand

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[kurupt305]

Update so I hooked up fuel pressure gauge I'm getting 60 psi thru out idle and wot got the car to lean out at top of gear and car pressure gauge did not drop so I'm thinking has to be somethin g with the tune and once the car gets real hot

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[kurupt305]

so my car completely died out on me yesterday the fuel rail isnt getting pressure and the pump is priming im thinking the corrugated rubber hose on my aftermarket fuel pump popped off for the third time i have no clue why the hell this keeps happening it was double clamped im running the zzp 35lph pump could it be flowing to hard? waht might be the reasons im going to try and put the plastic hose on instead hope this helps