chuggins143
Registered Member
Ok, long story short... I was a free member, and had started a thread in "The Garage", but found this area, became a member and now will be moving my thread here...
Old Thread...
http://coloradok5.com/forums/showthread.php?t=246631
Basic issue..
Bought a 90 K5 and it was throwing code 44.
The O2 sensor was at some point changed to a heated unit, I have disabled the heater so it is a single wire sensor again.
I was having really erratic idle (this is happening when it's cold so the O2 sensor isn't even in the loop... and it was doing it when the O2 is unplugged), revving really high and then down to almost dieing and back up again... I unplugged the IAC and it seemed to idle fine, replaced the IAC this afternoon and it seems to idle ok.
Prior to that I have replaced the temp sensor, and rewired the O2 sensor. Was also told to check to see if the fuel filter was clogged, it was recently changed by the PO. Haven't checked the fuel pressure yet. (still can't believe GM didn't put a port on this dang thing!) but will at some point. The fuel pump doesn't sound like it's surging, but I'll still check it anyway.
Now it will idle, but has absolutly no power when I let the clutch out, just falls on its face and either dies or runs and power surges so the whole truck bounces back and forth. I've looked for wires that might be grounding when the truck surges forward or backward, but have found nothing that's grounding out. I've had other vehicles act like this if the hot wire to the coil was swinging and loosing voltage, but this is different. I can rev the motor, but it just has no power. It's like the second you start to add any kind of load to the drivetrain it looses all torque. I can rev it and stick it in low, but it'll barely pull itself in low with me slipping the clutch and revving the crap out of it. My next step is to look at the EGR valve unless someone has a better idea... ??
THANKS!
Chad
Old Thread...
http://coloradok5.com/forums/showthread.php?t=246631
Basic issue..
Bought a 90 K5 and it was throwing code 44.
The O2 sensor was at some point changed to a heated unit, I have disabled the heater so it is a single wire sensor again.
I was having really erratic idle (this is happening when it's cold so the O2 sensor isn't even in the loop... and it was doing it when the O2 is unplugged), revving really high and then down to almost dieing and back up again... I unplugged the IAC and it seemed to idle fine, replaced the IAC this afternoon and it seems to idle ok.
Prior to that I have replaced the temp sensor, and rewired the O2 sensor. Was also told to check to see if the fuel filter was clogged, it was recently changed by the PO. Haven't checked the fuel pressure yet. (still can't believe GM didn't put a port on this dang thing!) but will at some point. The fuel pump doesn't sound like it's surging, but I'll still check it anyway.
Now it will idle, but has absolutly no power when I let the clutch out, just falls on its face and either dies or runs and power surges so the whole truck bounces back and forth. I've looked for wires that might be grounding when the truck surges forward or backward, but have found nothing that's grounding out. I've had other vehicles act like this if the hot wire to the coil was swinging and loosing voltage, but this is different. I can rev the motor, but it just has no power. It's like the second you start to add any kind of load to the drivetrain it looses all torque. I can rev it and stick it in low, but it'll barely pull itself in low with me slipping the clutch and revving the crap out of it. My next step is to look at the EGR valve unless someone has a better idea... ??
THANKS!
Chad
