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Question
MY 1992 Seville will sometime start in the morning and after warming up will cutout and can't be started again and and/or runs terribly? My mechanic checked fuel pump and is ok. He then replaced fuel filter and changed an ignition mod. This was  not the problem and mod.  original was reinstalled. My mechanic is still looking for cause. Any ideas on where to look next? Also checked rotor and is fine.

Answer
Hi,

Your mechanic has a strategic advantage over me. He is at the vehicle and he knows what he has changed and seen and I have no way of knowing.
Just because the fuel pump is putting out the right pressure does not mean there isn't a fuel problem. You could have water in the tank caused by years of condensation from not leaving the fuel tank full or where you have gotten the fuel, it may be contaminated. The first thing I would try is to dump one can of heat in the tank (no more) which should take care of any water issues.
You have the OBD 1 computer system, which was replaced in 1994 and is used currently. The OBD 1 left plenty of room for guess work for diagnostics. Not always does the check engine light illuminate giving a trouble code. You could have so man different things that could be causing you problem electronically. ECM (Computer) could be the problem. I do not recommend parts changing on a guess. It can get very costly.
Try the heat first and see if that does the trick. Its cheap and won't hurt the vehicle. You may want to put a can of fuel injection cleaner on your next full tank and see what happens
Let me know what happens.

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Rob Painter

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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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