Hi all. I have a 1987 Chevy Silverado 5.7L auto, 2WD. I know this is a mustang site and all, but I also know that its got some of the most knowledgeable people around. I finally got time to run to codes on my engine, and try to figure out why its sort of cutting out at certain RPM's, and why it just dies randomly when I'm driving. It can be restarted, but it takes longer then it should to start. But it pretty much always takes longer than it should to start. You have to crank on it for about... I'd guess about 2.5 seconds to get it to start. Unless you've already tried to start it and didn't hold down the switchkey long enough. Then it fails to start, but when you try again, it starts up like its supposed to. Fast. Anyway, here is the data from my scanner. This is live data from when I had the truck running at idle, in park, at normal operating temperature. So some of the data would fluctuate slightly as little things changed here and there. As for trouble codes... there weren't any. :-\
PROM ID: 9821
BATTERY VOLTAGE LOW: NO
RICH/LEAN FLAG: LEAN
LOOP STATUS: OPEN
ENGINE RPM: 775
THROTTLE SENSOR: 0.86 VOLTS
INTEGRATOR: 128 (I don't know what this is supposed to be or mean)
O2 sensor: It fluctuated between 134-145 volts when the truck was warming up. Once it got warm went back and forth from 114-123 volts
AIR DIVERT SOLENOID: ON
KNOCK SENSOR: 0 (I don't really know what it means by "0". Is that supposed to be zero voltage? Or maybe it means that the truck is not equipped with a knock sensor?)
BLOCK LEARN: 126 (Never heard of whatever this is)
02 CROSS COUNTS: 122 (Not sure what this means either)
I left out some random stuff that was listed by the code reader, just cause it was irrelevant or I already knew what it was and that it didn't have any effect on the problem. Such as the coolant temp, which was 183 degrees. And that the vehicle was in the Park gear, and was going 0 miles per hour. Just stuff we don't need. Everything else that the code reader gave is listed. Hope this info can help determine what the problem is.
PROM ID: 9821
BATTERY VOLTAGE LOW: NO
RICH/LEAN FLAG: LEAN
LOOP STATUS: OPEN
ENGINE RPM: 775
THROTTLE SENSOR: 0.86 VOLTS
INTEGRATOR: 128 (I don't know what this is supposed to be or mean)
O2 sensor: It fluctuated between 134-145 volts when the truck was warming up. Once it got warm went back and forth from 114-123 volts
AIR DIVERT SOLENOID: ON
KNOCK SENSOR: 0 (I don't really know what it means by "0". Is that supposed to be zero voltage? Or maybe it means that the truck is not equipped with a knock sensor?)
BLOCK LEARN: 126 (Never heard of whatever this is)
02 CROSS COUNTS: 122 (Not sure what this means either)
I left out some random stuff that was listed by the code reader, just cause it was irrelevant or I already knew what it was and that it didn't have any effect on the problem. Such as the coolant temp, which was 183 degrees. And that the vehicle was in the Park gear, and was going 0 miles per hour. Just stuff we don't need. Everything else that the code reader gave is listed. Hope this info can help determine what the problem is.
Comment