Question about 1999 GMC Suburban
I have a 99 suburban with the 5.7 engine and 4x4. It started to stall when I driving down the hwy, the rpm's would drop and came back. I limped back home, The next day went out and it started right up and drove about two miles and started acting up again. I thought it was fuel related so I changed the fuel pump. Didn't cure the problem. Took to local tech and his OBD II reader indicated the Crankshaft Position Sensor. He replaced it and said it was fixed, I drove about 5 miles and it started again. I purchanced my own OBD II and it came back with P0338 which say it an Crankshaft position sensor circuit intermittent. I returned to the tech and he removed the sensor it has been in contact with the relucter ring. He now suggests buying a new sensor from the dealer and trying that. Any ideas would be greatly appreciated.
On the 1999 - 2000 5.7 vortec engines the distributor gears wear causing the timing to change 2 or more degrees. The ecm is designed to shut down at 2 or more degreedifference. This is in a GM bulletin that recommends replacement at 160k miles. Mine went out at 150k miles. Very similar driving symtoms until it quit running. Both cam sensor codes were set on mine though, not the crank sensor.
Posted on Aug 24, 2008
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Engine stalling and rough run
issue at low speeds
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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