Nice, I’ll figure out how to use the scanner!
L92 low hot oil pressure at idle HELP!!!!
- Thread starter Jakob0327
- Start date
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Replacing that sensor is typically not something they do when they change your fuel pump.
Live fuel pressure data on your scanner reads from that sensor. When you first turn the key on but don't start the engine, 58 to 60 PSI is normal. After it's running, drops down to like 43 to 45 PSI.
A fuel pump on the way out might drop down below 43 PSI. And the initial pressure might be higher or lower than 58 to 60.
Post some data on what it's doing????
Not exactly sure why, but I've seen multiple instances where the fuel pump is on the way out, only putting out 35 PSI, and no check engine light or trouble code.
Live fuel pressure data on your scanner reads from that sensor. When you first turn the key on but don't start the engine, 58 to 60 PSI is normal. After it's running, drops down to like 43 to 45 PSI.
A fuel pump on the way out might drop down below 43 PSI. And the initial pressure might be higher or lower than 58 to 60.
Post some data on what it's doing????
Not exactly sure why, but I've seen multiple instances where the fuel pump is on the way out, only putting out 35 PSI, and no check engine light or trouble code.
But, we did already replace the fuel pump and I’m sure it was with a GM/AC Delco part. That was last fall, and it did not cure the problem. And, the problem does seem to be happening more often. We are out camping now for another week, but the investigation will continue when we get home!
Is there anyone in or near Akron, Ohio? We would love to learn more in person!
I'd still check the fuel pressure. Even OEM parts sometimes go bad sooner than expected.
See what the fuel pressure is doing so you can rule it out. Then check your EVAP system, particularly the purge valve on the intake to rule it out. See what your fuel trims are doing also. I would also suspect the throttle body....
See what the fuel pressure is doing so you can rule it out. Then check your EVAP system, particularly the purge valve on the intake to rule it out. See what your fuel trims are doing also. I would also suspect the throttle body....
Yep, once we get back from camping.
Here’s what’s been done recently:
MAF and filter
Battery cables and cleaned the grounds
PCV
Vapor Canister Purge Valve
Fuel pump - last fall, did not help!
Battery check is next then maybe fuel pressure sensor and cam/crank sensor. Need to keep it simple as we’re NOT mechanics! We have a Transit van that pulls the camper but the Yukon is so much more powerful we’re hoping to figure out the issues and use it instead of the Transit. More in a week or so when we get home. Thanks!
Here’s what’s been done recently:
MAF and filter
Battery cables and cleaned the grounds
PCV
Vapor Canister Purge Valve
Fuel pump - last fall, did not help!
Battery check is next then maybe fuel pressure sensor and cam/crank sensor. Need to keep it simple as we’re NOT mechanics! We have a Transit van that pulls the camper but the Yukon is so much more powerful we’re hoping to figure out the issues and use it instead of the Transit. More in a week or so when we get home. Thanks!
Add EVAP vent valve. It opens when the engine is running to pull fresh air in, while the engine draws in fuel vapors stored in the canister. Bad vent valve... Can create a vacuum in the tank if stuck closed. (Countering the fuel pump suction, according to physics.....might reduce fuel pressure)
Ok, more parts to locate on the car… where is this EVAP vent valve? Or is that the same as the vapor canister purge valve?
The purge valve is located on your intake manifold. The vent valve is right there next to your carbon canister, with a hose that goes up into the body work near the fuel filter hose, where it draws in fresh air when the valve is open. The vent valve usually comes with new hoses, and connects to the carbon canister.
