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Chris (aka-Moose)
Chris (aka-Moose), Auto Technician
Category: Toyota
Satisfied Customers: 814
Experience:  16 years of experience
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2001 Toyota celica 1.8. Codes Multiple Missfire Misfire

Customer Question

2001 Toyota celica 1.8.
Codes
Multiple Missfire
Misfire cylinder 1, 3, 4
Submitted: 1 year ago.
Category: Toyota
Expert:  AZTechBrian replied 1 year ago.

Hello. Do you notice any clattering noise? Have you done a fuel pressure test?

Customer: replied 1 year ago.
No clattering noise. No abnormal noise other than the typical misfire sounding like a boxer motor.The misfire is stronger below 3k rpm, clears up above 3k rpm.Fuel pressure test has not been done yet.
Expert:  AZTechBrian replied 1 year ago.

Ok. That sounds very consistent with a vacuum leak. Have you thoroughly inspected all vacuum hoses?

Customer: replied 1 year ago.
We hooked up a smoke machine to test for vac leaks. There was nothing found in the system. Smoke only escaped from the intake air box.
Expert:  AZTechBrian replied 1 year ago.

Do you have a scan tool that is capable of reading fuel trims? If so, what are your fuel trims? that will tell us if there is a vacuum leak or not.

If you had smoke escaping, then you were unable to build pressure to do an effective smoke test.

Next, There is an o ring that commonly goes bad on the mass air flow meter. replace that ring and see if it solves this problem. It's a very common cause of random multiple misfires on your model. Let me know what you find. If you need a diagram showing it's location, let me know.

Customer: replied 1 year ago.
Fuel Trim at IDLEShort Term -19.5
Long Term 28Fuel Trim at 3,000 RPMShort Term - 20
Long Term 48
Expert:  AZTechBrian replied 1 year ago.

What are the fuel trims if you hold the throttle at 3000 rpm? Have you replaced that o ring?

Customer: replied 1 year ago.
We have tried a new maf, and a new coolant temp sensor. both didnt do anything different.Fuel Trim at IDLEShort Term -19.5
Long Term 28Fuel Trim at 3,000 RPMShort Term - 20
Long Term 48
Expert:  AZTechBrian replied 1 year ago.

The long term trims are indicating a very lean condition. Check fuel pressure. check to see what the trims look like with elevated rpm

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