Roy
Jul 7, 2019 at 1:51 PM
Computer control relay location
2005 CADILLAC STS
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ASEMASTER6371
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You are welcome.
Roy
Roy
Error codes cylinders 4,5 and 6 misfires. Replaced sparkplugs ignition coils and fuel injectors. Error codes disappeared and car ran perfect. 30 minutes later ssne cylinder misfires pop up. However, thing is when I clear codes with diagnostic tool, car runs smooth and perfect. Yet 30 minutes later check engine light comes back on and car misfires. Believe problem is with actual ECM instead of actual cylinder misfires. What could be causing this?
Dec 10, 2020 at 7:04 AM
ASEMASTER6371
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What were the codes that set?
Roy
Roy
Dec 10, 2020 at 7:12 AM
P0304, P0305 and P0306.
Dec 10, 2020 at 9:03 AM
ASEMASTER6371
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What are the results of the compression test I requested?
Roy
Roy
Dec 10, 2020 at 9:23 AM
Compression is good. All sparkplugs ignition coils and fuel injectors are new.
Dec 10, 2020 at 9:32 AM
ASEMASTER6371
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Okay, what was the compression? Please give me the numbers.
Roy
Roy
Dec 10, 2020 at 9:34 AM
That's been a while. I honestly couldn't give you an exact number. But all were over 100 PSI. Very little differentials.
Dec 10, 2020 at 10:27 AM
ASEMASTER6371
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I would retest and get the exact numbers. It makes a difference. You should have 140-160 pounds. If you do not, that could be the issue.
https://www.2carpros.com/articles/symptoms-of-low-compression
Roy
https://www.2carpros.com/articles/symptoms-of-low-compression
Roy
Dec 10, 2020 at 10:29 AM
Will do. Thank you. So you don't think it could be an ECM problem?
Dec 10, 2020 at 10:37 AM
ASEMASTER6371
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Not at this point.
Roy
Roy
Dec 10, 2020 at 10:41 AM
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