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Cadillac Repair/94 cadillac seville sts

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Expert: - 9/30/2010


Question
i have the 4.6 engine in this car the car runs great but a little high idle the thing that bothers me is that the rear manifold gets bright red when it sits to idle. What can be causing this?

Answer
Hello,

I would be very concerned the manifold gets red hot as well. Your high idle could be a symptom of computer or sensor problem. If I were you, I would get the car into a service center now (not a dealer) and have them scan the computer. This is obviously not normal and if that manifold is that hot, you could end up with an engine fire.

The engine sounds like it is running to lean and that bank of the engine is running very hot too. This is an aluminum engine as well and will not stand up to any type of cooling system over heating, nor can it stand up to the type of heat to turn the manifold cherry red.

Let me know what they find. I am curious.

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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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