Engine Performance problem
1994 Chevy Silverado V8 Two Wheel Drive Automatic 254000 miles
Hi, my 1994 chevy 2500 v8 K vin 5.7 liter stalls at cold idle and while driving, but esp when I first crank it up cold. I had this prob a couple wks back and it sent code 35 IAC valve. With throttle body exposed the TB makes loud hissing sound, as if vacuum leak or starved of fuel. Then when this sound goes away, the vehicle runs. I can run up to whatever speed, say 60 mph last night down highway and boom, vehicle dies. Started back up and got it home. This morning, same hissing and stall over and over, then ran fine, then stalled. Not sure IAC valve could cause this vehicle to stall like this at idle or driving at higher rpm. Hope that is what it is though. I disconnected fuel line and tested fuel flow and filter, and it seems that fuel flow is vast. Could it be a fuel pressure regulator, or intermittent fuel pump issue? I tested map sensor, and ignit module and they test fine. Spark or fuel, I don't know, or even a sensor? The hissing at TB is what puzzles me though. When it runs fine, hissing gone, then comes back and boom, vehicle stalls out. Could it be relay? I cannot find a fuel pump relay on this at all. I am just wondering why it sent code 35 IAC valve though. Could that cause vehicle to die at all speeds and idle? Maybe it is a weeks fuel pump. Prior to this problem, a day or two before, I ran out of fuel due to fuel gauge being inoperative. Please help as I would like to be able to see my little boy and girl. Thanks.
Sunday, September 14th, 2008 AT 2:31 PM