my car run lean today ?? need help please
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my car run lean today ?? need help please hi , today i went to the Dyno to tune my car , we pulled three times the car runs lean above 5000 RPM A/F 15-16 , i don't know why it runs lean !! i installed Walbro 255 fuel pump before 1 week , what is the problem ?
please guys help me
please guys help me
Thread Starter
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From: Middle east , Kuwait
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From: Middle east , Kuwait
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Judging by your mods if you are running stock injectors it is a very good chance that you are maxxing the stock injectors out. I would bump up to at least a set of Ford 30#er's (equivalent to 35-36# at our 58psi fp) and change your fuel filter.
Just for reference I was running a 110% duty cycle on my stock injectors with a mild set of ported LS6 heads, stock LS1 intake, and a 232/234 .595/.598 112 Cam. So with your much bigger MS4 and a lot better flowing Fast90/90, I'm sure you are running just as much or more duty cycle if you have stock injectors. What did the tuner say was the issue?
Just for reference I was running a 110% duty cycle on my stock injectors with a mild set of ported LS6 heads, stock LS1 intake, and a 232/234 .595/.598 112 Cam. So with your much bigger MS4 and a lot better flowing Fast90/90, I'm sure you are running just as much or more duty cycle if you have stock injectors. What did the tuner say was the issue?
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the tuner said : the problem is fuel pump , i swapped the fuel pump to walbro 255 and the problem fixed and i tune it with nitrous and everything is okay now.
Glad you got it fixed!!! So did you have a bad walbro fuel pump? I've had them go bad on me before and it was mostly due to wiring (using to small gauge wire for the pump) Hot Wire kit is recommended.
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yes the fuel pump was bad and i had has bad pressure , when i changed to the new one same as old one , everything is good now
