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AZTechBrian
AZTechBrian, ASE Certified Technician
Category: Toyota
Satisfied Customers: 708
Experience:  Owner
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I have a 2003 Toyota Corolla and I am have a very rough

Customer Question

Hi I have a 2003 Toyota Corolla and I am have a very rough ideal so far I've replaced to mass air flow sensor, head gasket, and this little thing under my throttle body that has the two coolant lines going into it. Can runs fine at higher Rpms only and issue when idleing
Submitted: 1 year ago.
Category: Toyota
Customer: replied 1 year ago.
Thinking it might possibly be a vacuum leak but I no nothing about those
Expert:  AZTechBrian replied 1 year ago.
Hello. Have you checked for codes yet? I'm sure there are some.
Customer: replied 1 year ago.
No I don't own a code scanner
Expert:  AZTechBrian replied 1 year ago.
Ok. I would advise then stopping by autozone and having them scan for codes. That will point us in the right direction. It does definitely sound like a vacuum leak though. Vacuum leaks often do result in a rough idle, but no issues at increased RPM.
Customer: replied 1 year ago.
Um can u tell me where the vacuum tube is or like how many r there like if it's only a couple I could check them but what would I use to find a whole
Expert:  AZTechBrian replied 1 year ago.
There are a lot of potential sources of vacuum leaks under the hood. The best solution is a smoke test. You can try to listen for a sucking whistling sound under the hood. Sometimes they can be heard like that.
Expert:  AZTechBrian replied 1 year ago.
That doesn't mean that it's definitely a vacuum leak though. If you can get access to a scan tool and at least check codes that would be very helpful. If you can also check fuel trims that would be even more helpful.
Customer: replied 1 year ago.
Ok I'll try autozone first
Expert:  AZTechBrian replied 1 year ago.
great. Let me know what they come up with and well get this figured out for you.
Customer: replied 1 year ago.
Alright I will um thanks for the help
Expert:  AZTechBrian replied 1 year ago.
Your welcome
Expert:  AZTechBrian replied 1 year ago.
If I don't respond right away, I will as soon as I am able to.
Expert:  AZTechBrian replied 1 year ago.
Hi. How did it go? were you able to get the codes?