On the injector balance test good cylinder drops 8 - 11 psi with 10 pulses of 12volts. Bad cylinder drops 6-8 psi with 10 pulses. I did the tests 4 times on each of the two cylinders. I had to start the engine each time to get max psi on the gauge. Is a 2-3 psi difference significant?
I also did a LTFT fuel trim test. On bank 1 LTFT was 9% at idle, 9 % at 1500 rpm, and 11% at 2500 rpm. On bank 2 LTFT was 20% at idle, 14% at 1500 rpm, and 14% at 2500 rpm. Fuel pressure is 30 psi running. Could a dirty MAF cause such bad numbers? I have MAF cleaner spray I could use. Could a coolant temp sensor cause this? I tried spraying carb cleaner all around the engine while watching both O2 sensor voltage. It didn't change.
I also checked the DPFE(EGR device)When I applied vacuum the volts changed from.5v-4.9v like it should. When I applied vacuum it went down slowly. Is this a problem? Also the EGR with vac applied roughens the idle. The EGR diaphragm holds vacuum. When running at idle there is a very small vacuum(1 inHg) on the vac pipe which activates the EGR. Is this normal? I haven't pulled the spark plug yet I think it would look wet. Thanks for your help.
Thursday, July 3rd, 2014 AT 2:45 AM