Thread: Car Leaning out

In first and second gear all the way to redline the car a/f is fine. When i reach 6k rpm in third the car starts to leanout.

Was at the dyno and did a base run the car pulled all the way to redline with no problem. Took out my chip and put in the realtime chip to start tuning, did a run and it was ok. Then all of a sudden the car started to run lean. We dumped car up top and same result. So we put in back my chip and the same thing happens.

Had a problem before when first and second gear was leaning out, found out that the the clamp holding the AFM was loose so air was being suck from behind the AFM. Fixed that and first and second gear is quite fine.

Anyone could tell me what could be wrong.

My setup:

Sr20ve with Sr16 cams
Sr18 Gearbox
190 LPH fuel pump
Stock Header
3" Exhaust


Thanks

fuel pump my friend is not holding pressure use a walbro one 255lph i think it is! believe me same thing happened to me... GOOD LUCK!

Agreed

Thanks. will do that and see what happens.

But why doesnt it drop pressure in first and second gear?

maybe the engine revs so fast that the pump can make it up to the revs but in third gear is harder to it... i dont think is a tune issue just change the pump and REV IT!! u will feel the difference!

I see that happend before... Change the fuel pump for a better one!! And you will be happy !!

just happened the same thing to my ride this past week, replace the pump

will be changing it in sometime this week.

Thanks for the responses