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1990 cadillac coupe deville
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25 Posts
Discussion Starter #1
Hello all I finally registered. Any way I have a 90 cad coupe deville 4.5 v-8, when I got in the car today I started her up and let her warm up I realized she was idleing hard and I put her in drive and the whole time my foot was on the gas it was jerking. So I pulled over and cut her off and let her sit for about 5-10 min then started her back up and she ran smooth. That was this morning on the way to my class. So I didn't think nothing of it untill it happen again today but this time I was on my to work. And basicly the same thing happened. And I did the same thing. I'm still at work but on break. If anyone has any idea what the problem may be and how to fix it I'd really appreciate it.
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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87,094 Posts
Start by pulling the DTC's. How many miles on it? When was the last tune up?
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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87,094 Posts
Then we can probably rule out plugs, wires, cap & rotor. We need to figure out if it is ignition or fuel. Start by pulling the codes.
 

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1990 cadillac coupe deville
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25 Posts
Discussion Starter #7
ipressed and held the two buttons. It's saying hi fan in top right corner and econ, auto, off down the left....and now the car just cut off. What's going on?
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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87,094 Posts
That does not make much sense. Try it again. The engine does not have to be running. Just key on.
 

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1990 cadillac coupe deville
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25 Posts
Discussion Starter #9
fuel center sayin .7.0 after it blinked e49 a few times. And from left to right ccc says off ---'c and hi fan
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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87,094 Posts
.7.0 means it is ready for the next command.
P049 (E049) .............................. Air Injection Reaction (AIR) System Fault
I did not think that would cause the type of driveability problem you described.
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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87,094 Posts
P041 (E041) ................... No Cam Reference Signal from Ignition Control Module
There is your problem. I think this has come up before. Do a search for cam reference signal. It is a distributor problem as I recall. Hall effect switch or something like that.
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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87,094 Posts
Not sure. I think F is a body code so it might be
A010 ............................................ Outside Temperature Sensor Circuit
Are you having any trouble with outside temperature readings?
 

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1990 cadillac coupe deville
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25 Posts
Discussion Starter #18
how much does it cost to replace the cam signal and the ECM? thanks in advance....
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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87,094 Posts
The outside temperature sensor is very easy to fix. It is mounted on the hood latch bracket behind the grill.

I have no idea on prices.
 

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Registered
1990 cadillac coupe deville
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25 Posts
Discussion Starter #20
ranger how many manuals and sub manuals are there for 1990 devilles? The shop manuals?
 
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