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  #1  
Old 06-30-2009, 09:20 AM
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Location: Panhandle of Florida
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Exclamation 1990 Deville - Hot Cat. & Rough Idle

I have a 1990 Deville (4.5L @ 131,000 miles) that has a catalytic converter that glows red hot . It was replaced and does the same thing. The engine idles rough but on the road, she runs like a scalded dog . I had a fuel injector replaced but that didnít do anything to ease this problem. Not sure if this is coincidental or not but the AC is only working at about 40%. All this started at the EXACT same time.

This car is in the shop as I write this so I cannot pull the codes. The local mechanic has given up after replacing the intake manifold gaskets, spark plugs and two more injectors. He has taken it to a GM dealership for diagnostics. Iím afraid to see the final bill Ė YIKES !
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Old 06-30-2009, 09:24 AM
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Location: Panhandle of Florida
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Exclamation 1990 Deville - Hot Cat. & Rough Idle

I have a 1990 Deville (4.5L @ 131,000 miles) that has a catalytic converter that glows red hot . It was replaced and does the same thing. The engine idles rough but on the road, she runs like a scalded dog . I had a fuel injector replaced but that didnít do anything to ease this problem. Not sure if this is coincidental or not but the AC is only working at about 40%. All this started at the EXACT same time.

This car is in the shop as I write this so I cannot pull the codes. The local mechanic has given up after replacing the intake manifold gaskets, spark plugs and two more injectors. He has taken it to a GM dealership for diagnostics. Iím afraid to see the final bill Ė YIKES !
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  #3  
Old 06-30-2009, 11:59 AM
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Quote:
Originally Posted by ChazMan View Post
I have a 1990 Deville (4.5L @ 131,000 miles) that has a catalytic converter that glows red hot . It was replaced and does the same thing. The engine idles rough but on the road, she runs like a scalded dog . I had a fuel injector replaced but that didnít do anything to ease this problem. Not sure if this is coincidental or not but the AC is only working at about 40%. All this started at the EXACT same time.

This car is in the shop as I write this so I cannot pull the codes. The local mechanic has given up after replacing the intake manifold gaskets, spark plugs and two more injectors. He has taken it to a GM dealership for diagnostics. Iím afraid to see the final bill Ė YIKES !
this one is easy .. TOO MUCH unburned FUEL is reaching the cat ...
the why is a little more work !

it could be wrong injectors,plugs nor firing, coils not firing, coolant sensor failing, wrong hookups for the emissions systems, etc..



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  #4  
Old 07-04-2009, 11:34 AM
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Location: Panhandle of Florida
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Unhappy Bad News!

I just called the mechanic; #3 cylinder is taking in water!

He explained that the water comng through the exhaust is causing the cat. to glow red hot. Wierd thing is, as far as I know, the engine never overheated! I don't ever recall seeing a red light, or any warning signs of the engine getting too hot.

Is this common or is my mechanic trying to sell a new engine? He says you can't do a normal head repair as these engines are "baked?" What does that mean?
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Old 07-04-2009, 11:34 AM
 
 
 
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1990, 1990deville, 45, cadilac, cadillac, deville, engine, exhaust, glowing, hot, idles, manifold, misses, problems, red, rough


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