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Cadillac Repair/94 DeVille 4.9 Wont Start When Hot

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Question
I have a 1994 Cadillac DeVille 4.9 liter with about 94K actual miles on it. After taking it to an independent shop for some idle adjustments, the car now will not start when hot. It turns over very, very slowly like a car with a normal distributor would do if you had the distributor way to far advanced. I opened the hood and let the car sit for about 15 minutes, and when I tried to start it again, it strained for a few turns, and then started right up. On starting, however, I got a serious case of spark knock for a second or two, and then it settled right down. Any ideas?

Answer
Hello,

Very rarely do I blame the last guy that worked on the vehicle, however you need to take the vehicle back to this shop and have him undo whatever he did because it sounds like you did not have these issues before getting the adjustments.
I can't give you any ideas because I have no clue as to what was done for adjustments.

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Rob Painter

Expertise

Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

Experience

Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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