P0171 and P0174. Bank 1 & 2 lean. LTFTs are maxxed at +25% and the STFTs are ranging from 15-20%.
Just installed stock replacement heads on a suburban that's been sitting for a while. It's also throwing a P1345 code from the distributor not being set dead on. When I first started it a few days ago, it was throwing P1345 and a P0161 (pass. side post-cat O2 sensor). Today I changed the tranny fluid and swaped the rear O2s while I was down there to see if it was a cat or O2 issue. Started the car back up and it didn't throw anymore O2 codes, but the two lean codes. I sprayed some starter fluid around, and didn't find any obvious leaks. Around the front right of the intake, near the alternator, I think there is a tiny vac leak. RPM changed ~50 when I sprayed starter fluid. I tighted the plenum bolts there a little more but didn't make a difference and I don't know why the lower intake would be leaking. I used the metal felpro gaskets and ample RTV when I reinstalled, and torqued everything as per the service manual instructions... not sure if that minor leak would cause the car to run so rich though...
It has the stock fuel spider. Going to try changing the fuel filter tomorrow, can't remember if it's been changed recently. I've cleaned the MAF and changed the PCV valve. I also notice that when the car is warmed and I start it, it'll start and then promptly die. 2nd start is no problem though. However I'm not sure if the distributor has anything to do with that. Maybe the poppet valves on the stock spider are leaky and causing the engine to flood? It seems unusual that both banks would be bad, but who knows. Also sometimes there's a slight hesitation when moving from a stop. It lasts for a second, then it's fine. Reminds me of my C5 that has a lean spike when I'm shifting gears after a cold start...
I'd love some suggestions/comments. Car is a '97 k1500 suburban with 198k on the odometer.
Just installed stock replacement heads on a suburban that's been sitting for a while. It's also throwing a P1345 code from the distributor not being set dead on. When I first started it a few days ago, it was throwing P1345 and a P0161 (pass. side post-cat O2 sensor). Today I changed the tranny fluid and swaped the rear O2s while I was down there to see if it was a cat or O2 issue. Started the car back up and it didn't throw anymore O2 codes, but the two lean codes. I sprayed some starter fluid around, and didn't find any obvious leaks. Around the front right of the intake, near the alternator, I think there is a tiny vac leak. RPM changed ~50 when I sprayed starter fluid. I tighted the plenum bolts there a little more but didn't make a difference and I don't know why the lower intake would be leaking. I used the metal felpro gaskets and ample RTV when I reinstalled, and torqued everything as per the service manual instructions... not sure if that minor leak would cause the car to run so rich though...
It has the stock fuel spider. Going to try changing the fuel filter tomorrow, can't remember if it's been changed recently. I've cleaned the MAF and changed the PCV valve. I also notice that when the car is warmed and I start it, it'll start and then promptly die. 2nd start is no problem though. However I'm not sure if the distributor has anything to do with that. Maybe the poppet valves on the stock spider are leaky and causing the engine to flood? It seems unusual that both banks would be bad, but who knows. Also sometimes there's a slight hesitation when moving from a stop. It lasts for a second, then it's fine. Reminds me of my C5 that has a lean spike when I'm shifting gears after a cold start...
I'd love some suggestions/comments. Car is a '97 k1500 suburban with 198k on the odometer.
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