AFR Jumps way high in boost
#1
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AFR Jumps way high in boost
Hi I own a 2008 Cobalt SS/TC on E85. I bought the car on Craigslist and supposedly it is tuned for 25psi and E85 and has the upgraded fuel pump and injectors and all of that.
When I go into boost suddenly or aggressively the afr jumps really high (~29) im not sure if it’s a sensor problem or if I’m maxing anything out while doing so? If I ease into boost the afrs seem to be fine but again I’m not sure. (I’ve had the car for months and have driven it at WOT multiple times but I just programmed the gauge for AFR and I’m surprised it hasn’t blown up yet? Thanks for any info
When I go into boost suddenly or aggressively the afr jumps really high (~29) im not sure if it’s a sensor problem or if I’m maxing anything out while doing so? If I ease into boost the afrs seem to be fine but again I’m not sure. (I’ve had the car for months and have driven it at WOT multiple times but I just programmed the gauge for AFR and I’m surprised it hasn’t blown up yet? Thanks for any info
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Bigboybalt (12-08-2018)
#4
With a 29:1 AFR under throttle, the fuel mixture is too lean to support combustion. That will result in misfire on all 4 cylinders and a loss of all power and boost. If the engine is running normally and it's still showing 29:1, you have something else going on.
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