What can cause a cylinder 5 misfire code in 97 cadillac deville?

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What can cause a cylinder 5 misfire code in 97 cadillac deville?

Postby bittan67 » Sun Jun 12, 2011 2:20 am

i got a o2 sensor code also. would that cause it? my car idles a little high on start up also.
I have replaced spark plug and wires and ignition coils 3 months ago. What else can it be?
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What can cause a cylinder 5 misfire code in 97 cadillac deville?

Postby haslet » Sun Jun 12, 2011 2:21 am

a misfire can be cause by timing, bad spark plug or plug wire, fuel mixture (not to common).
Distributor rotor cap, ignition coil. things like that.

most commong would be bad plug or plug wire, timing and rotor cap.

)2 sensor may cause it and the reason for that is an unbalanced fuel mixture
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What can cause a cylinder 5 misfire code in 97 cadillac deville?

Postby santiago84 » Sun Jun 12, 2011 2:26 am

There is a control module for the ignition system on these cars (the board that all of your coils connect to). This may be the source of your problem, or it could be a lack of fuel to the number 5 cylinder causing a lean condition and detonation.

Try swapping some coils around on the board and see if the problem remains the same, because that will rule out your ignition coils as being the source of the problem.

If it is your upstream oxygen sensor, (bank 1 or 2, sensor 1), it is the one that controls the fuel mixture and it could be creating an artificially lean condition and causing your problem.

Each cylinder needs the correct amount of fuel, air and spark to run so check all three.
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What can cause a cylinder 5 misfire code in 97 cadillac deville?

Postby beolagh » Sun Jun 12, 2011 2:29 am

check for vacum leaks
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