1990 Deville - Hot Cat. & Rough Idle
#1
06-30-2009, 09:20 AM
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 didn’t 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. I’m afraid to see the final bill – YIKES
!
. 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 didn’t 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. I’m afraid to see the final bill – YIKES
!
#2
06-30-2009, 09:24 AM
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 didn’t 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. I’m afraid to see the final bill – YIKES !
. 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 didn’t 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. I’m afraid to see the final bill – YIKES
!
#3
06-30-2009, 11:59 AM
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 didn’t 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. I’m afraid to see the final bill – YIKES !
. 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 didn’t 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. I’m afraid to see the final bill – YIKES
!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..
.
#4
07-04-2009, 11:34 AM
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?
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?
Thread
Thread Starter
Forum
Replies
Last Post
Magnaflowrep
Vendors Area
0
03-12-2008 04:22 PM
bighank
General Tech
2
11-18-2007 07:50 PM
