Running lean Im talking 17.1+
#1
Running lean Im talking 17.1+
I just rebuild my t2 and I'm running into the little run issues that come with it. the car is running very lean at idle and it gets worse when driving. I replaced the fuel filter, the injectors, the pulges and reset the timing. the only thing that i would this it to be is the fuel pump but i can hear it when the car starts. at this point im stumped if u have any ideas let me know. thank you
#4
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iTrader: (7)
First off, do you have an air pump hooked up? If so, it will make your AFR readings far leaner than they actually are.
If not, tee a pressure gauge into your fuel feed line and measure fuel pressure. At idle it should be around 30 psi, with the vac line removed from the FPR or FPR solenoid ~40 psi, and then increase by 1 psi per lb. of pressure applied (bike pump works).
If this is an S4 TII, are you able to richen up the idle mixture with the variable resistor? Turn it towards "R" and check the AFRs.
List out exactly what you're running too. What fuel pump, FPR, injectors, fuel controller, ECU, boost levels?
If not, tee a pressure gauge into your fuel feed line and measure fuel pressure. At idle it should be around 30 psi, with the vac line removed from the FPR or FPR solenoid ~40 psi, and then increase by 1 psi per lb. of pressure applied (bike pump works).
If this is an S4 TII, are you able to richen up the idle mixture with the variable resistor? Turn it towards "R" and check the AFRs.
List out exactly what you're running too. What fuel pump, FPR, injectors, fuel controller, ECU, boost levels?
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#11
Ive pressure tested the motor and pulged all the leaks. the only reason y i think the wide-band is right is because i pulgged it in and was idleing at 16.1ish then i changed the fuel filter and it went down to 15.1 but when the car comes into boost it pegs over 17.1 afr and it will hold boost for a few seconds then backfire and lose all power. after that coming back to idle its rough and will usually stall. if i let it sit for a few seconds and then start it, it comes right back to life and idles with a afr of 15ish again.
#14
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iTrader: (7)
I still maintain that the gauge is wrong. The engine will run very rough if you try to make it idle with anything above about a 14 AFR. But what you wrote ^ sounds like you're hitting fuel cut, which will produce a very lean reading on the gauge anyhow. You said you have an aftermarket exhaust, so what exactly does that include? Turbo-back or cat-back only? If the precat and cat have been removed, you're guaranteed to overboost and hit fuel cut, if the wastegate is stock.
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