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.
I have the same issue, replaced fuel pump twice, still will stall on the highway. I can turn the car off, neutral, then back on and it will run fine for a while.I have the same issue, replaced fuel pump twice, still will stall on the highway. I can turn the car off, neutral, then back on and it will run fine for a while.
You can't post conmments that contain an email address.
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.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
I had a 99 Suburban that did almost the same thing, it turned out to be the Catyletic Converters were plugged. Try taking the exhaust pipe loose at the manifold for test purposes. If it runs good with the pipes loose, that's the problem. Replace the Cat's. There were no codes for either, it would start and run nice for about 5 seconds, then run rough and then stall.
Does it tick then a bit later tick again? If so that's most likely an automatic circuit breaker that you hear. If you have a short in the wiring the circuit breaker kicks out (tick) and shuts that circuit down, after a minute or so the circuit breaker cools enough to reset itself (tick again). That would explain the truck shuting down. The circuit breaker will continue to reset itself until the battery goes dead, I would suggest disconnecting the battery until you can get it to a shop. You have a short in the wiring somewhere. Good Luck!
Hello;
Have you checked the fuel pressure? You may have a sticking fuel regulator, causing too much fuel at idle. Since it works fine off idle and cruise I would look there.
Thanks;
Rich
RPM Northwest
I have the same issue, replaced fuel pump twice, still will stall on the highway. I can turn the car off, neutral, then back on and it will run fine for a while.
×