HT4100 4.1, 4.5, 4.9 Discussion, 1985 Fleetwood FWD 4.1L hesitation/rough idle/won't start in Cadillac Engine Technical Discussion; I bought this a few weeks ago. I think it was sitting for a year or so before. It overheated ...
I bought this a few weeks ago. I think it was sitting for a year or so before. It overheated somewhat on the way home (almost no coolant), but it didn't blow any gaskets and I shut it off once the coolant light came on (let it cool off, then filled it up). It was dying while stopped in drive, and had hesitation when accelerating (and a 1.5-2 second delay when flooring it to feeling any acceleration).
I replaced the O2 sensor (check engine light was on) and installed a new battery (battery was toast). That seemed to improve it greatly; however, it still idles rough and dies about half the time, and has hesitation and runs rough.
I drove it a few blocks today, and the car died when I was pulling into the driveway (while still moving). Now the car won't start properly. I can crank it over, and when I floor the pedal it will start, but if I let off the gas it dies almost immediately, and if I keep it floored it won't stay started for more than a few seconds (and won't rev up very high).
Here are the engine codes that I pulled:
E20 - Open Fuel Pump Circut Feedback Signal
E30 - ISC RPM Out Of Range
E52 - PCM Memory Reset (See Note)
E59 - VCC Temperature Sensor Circut Problem
F40 - Air Mix Door Problem
F41 - Cooling Fans Problem
No idea what's going on here. Any clues what to check, or what the problem could be?
I found the fuel pump relay (I think... there were two relays hanging down next tot he battery, couldn't find more or any fuses under hood). Also puled the oil pressure light switch. All three appear to be covered in oil/grease, one of the relays had corrosion.
Didn't locate the coolant temperature sensor.
Also, I found a wire hanging out of a socket a few inches to the driver side of the cylinder 8 spark plug hole. The plastic connector shroud is broken and the wire won't stay in the hole. Can anyone tell me what this does, and how to get a replacement (other than a junkyard)?