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Category: Saturn
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2007 saturn: cap on plug..1still reading code p0301 cylinder 1 misfire

Resolved Question:

2007 saturn ion
reads cylinder 1 misfire
replaced all plugs with iridium plugs
replaced cap on plug on cylinder 1
still reading code p0301 cylinder 1 misfire
Submitted: 5 years ago.
Category: Saturn
Expert:  MPMoore replied 5 years ago.
Hi, thank you for asking your question on JustAnswer. The other Experts and I are working on your answer. By the way, it would help us to know:

-Does the car miss fire all the time?

-How many miles are on your Saturn?

Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.
Customer: replied 5 years ago.

yes run very poorly so i would say misfire is constant


120,000 miles

Expert:  MPMoore replied 5 years ago.

These cars are know for valve issues so the next step would be to do a compression test. You need to compare the compression reading on the number 1 cylinder to the rest of the cylinders. If the compression is low, you will need to have the cylinder head repaired. If you do not have a compression gauge, your local auto parts store may rent or lend you one. If not, they cost around $35.

Perform a compression test and let me know what you find.

MPMoore and 5 other Saturn Specialists are ready to help you