When driving it home, it drove about thirty five to forty miles, engine seemed to start getting choked up and started surging and shutting off and I started to lose speed, went from sixty to forty in about ten seconds, pulled over and it would not start back up. Did not even try. Had it towed home. Went out the next morning started up great, tried driving it in a parking lot next door, within five minutes it shut off again. Checked the codes for the CEL, got code 43. Replaced the knock sensor, 43 went away but still would not start while at operating temperature. No CEL or codes at this time.
I changed the fuel filter because it was old and clogged (hard to blow into) tested the fuel pressure at the rail. Steady 38 pounds, when it would shut off it would shoot up to 45. So not the fuel pump.
I took it to a shop and asked them what they suggest I look at, they said fuel pressure regulator.
I replaced the regulator, still no change. Runs a little longer but still surges and sputtered. Checked codes again even though there was no CEL and got code 33 at first, then later that day code 34 popped up too.
33 and 34 is high and low vacuum at the the MAP sensor. I replaced the vacuum lines thinking maybe I broke one and unplugged the low coolant sensor. Ran great with no issues, so much so I even drove it to work. On my way home, started hesitating and surging again and shut off in the middle of traffic. Replaced the MAP sensor. Still no dice. I am at a complete loss as to what could be wrong.
Pretty sure the reason I got this car as cheap as I did was no one could figure it out.
It appears to have:
New re-manufactured ECM.
New IAC sensor(but idiot before me put it in cross threaded and loose).
Fuel pressure regulator.
I do not even know what to test or check now. Please help me out with some ideas and advice.
have the same problem?
Wednesday, December 20th, 2017 AT 8:38 AM