Cadillac Friends,
I am writing because I am practically at my wits-end with my 1992 Allante. Three weeks ago I decided to finally fix that pesky oil leak at the oil cooler line near the filter by replacing the o-ring seal, per my factory suggestion. The repair went flawlessly. However....to get to the line...the inside, hardest-to-get-to line, I had to remove the top of the air and rubber tube that the went to the throttle body, the cruise cable and one electrical conncter, then the outer cooler line and the oil pressure sensor. I think that's all I removed or disconnected.

While I could see inside the body, I noticed the two butterflies had a small bit of dirt around the outside edges, so I used some Gumout carburetor cleaner I had on hand to knock-off that little bit of dirt. I could not have used much more than an ounce or so, as my can was almost empty and I had trouble getting hardly any to come out of the can. I did this with the and it nearly killed the engine several times as I sprayed the cleaner. When I was done and tried to drive the car it ran Horrible! I had never had a single drivability issue before and was quite disturbed. At first I had an E017 code (left 02 sensor not ready). I clerared that code and it came back one time. I thought maybe I washed the dirt into an injector, so I got a can of seafoam and put it in the fuel tank and ran it through, then filled with fresh 91-Octane gas. No help whatsoever. The E017 code has not come back again, but because I got it twice, I replaced both. again, no help. One of the tests point to the PCM, but that's ridiculous, unless all this is just a great coincidence, which I doubt. I do get random codes once in a while on the tailights and other sensors, and I just clear them and they stay away causing no problems.

I little more detail on my drivability issue: The engine misfires, seemingly on one. It will cut in and out, running fine for short times then drop back out to a misfire. I am about out of ideas short of replacing the PCM. The O2 sensors were relatively, but the PCM is more and more work as well. Given your collective level of genius, I thought I might ask for even a guess that might help.
JB

 

Noboby has offered any sugestions here. It is summer and my car is not running, can anyboby please offer something from their experience? FYI, I just had a highly regarded mechanic refuse to look at my car becasue they are too hard to diagnose! At least I feel a little better that I am having trouble!

 

If it ran correctly prior to repair review what you did. What all did you take loose or disconnect? When does it misfire?. A lot of techs don't like Cadillac DFI let alone an Allante'.