Answer
Feb 29, 2024 - 02:22 AM
Hey there!
What are the misfire codes your 1999 Cadillac Seville is throwing? Can you share with us the codes? Since you've already swapped the plugs, wires, and coils, still your Seville is throwing a tantrum. While the ignition control module (ICM) could be the culprit, there are a few other things to consider before replacing it, especially since they're getting scarce. Here's the deal:
1) Check for sensor issues: A faulty crankshaft position sensor (CKP) or camshaft position sensor (CMP) can mimic ICM failure. These sensors tell the ICM when to fire the spark plugs, so a bad one can cause misfires.
2) Look for vacuum leaks: Unmetered air entering the engine can mess up the air-fuel mixture and lead to misfires.
3) Check for any hissing sounds or cracked hoses around the intake manifold.
4) Inspect the ICM visually: Look for any burnt or fried components on the ICM itself. If it looks toasty, then replacement might be your only option.
Now, testing the ICM can be tricky on these older vehicles. Some mechanics might have specialized tools, but often it's a matter of diagnosing by elimination and swapping the ICM with a known-good unit from a junkyard or another car.
Since new ones are hard to find, a used ICM from a reputable source might be your best bet. Just remember, used parts come with their risks, so make sure you get it from a reliable source and ideally, have a return policy in case it doesn't solve the issue.
If you're not comfortable tackling this yourself, don't hesitate to take your Seville to a mechanic experienced with these older Cadillacs. They can properly diagnose the problem and get you back on the road without throwing parts at it.
You may need some parts in the process, click this link to be directed to our website where your vehicle information has already been entered. Simply enter the part's name into the search field to get started.
Good luck!
What are the misfire codes your 1999 Cadillac Seville is throwing? Can you share with us the codes? Since you've already swapped the plugs, wires, and coils, still your Seville is throwing a tantrum. While the ignition control module (ICM) could be the culprit, there are a few other things to consider before replacing it, especially since they're getting scarce. Here's the deal:
1) Check for sensor issues: A faulty crankshaft position sensor (CKP) or camshaft position sensor (CMP) can mimic ICM failure. These sensors tell the ICM when to fire the spark plugs, so a bad one can cause misfires.
2) Look for vacuum leaks: Unmetered air entering the engine can mess up the air-fuel mixture and lead to misfires.
3) Check for any hissing sounds or cracked hoses around the intake manifold.
4) Inspect the ICM visually: Look for any burnt or fried components on the ICM itself. If it looks toasty, then replacement might be your only option.
Now, testing the ICM can be tricky on these older vehicles. Some mechanics might have specialized tools, but often it's a matter of diagnosing by elimination and swapping the ICM with a known-good unit from a junkyard or another car.
Since new ones are hard to find, a used ICM from a reputable source might be your best bet. Just remember, used parts come with their risks, so make sure you get it from a reliable source and ideally, have a return policy in case it doesn't solve the issue.
If you're not comfortable tackling this yourself, don't hesitate to take your Seville to a mechanic experienced with these older Cadillacs. They can properly diagnose the problem and get you back on the road without throwing parts at it.
You may need some parts in the process, click this link to be directed to our website where your vehicle information has already been entered. Simply enter the part's name into the search field to get started.
Good luck!
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