Toyota Avalon rev limited to 4k

EdJonesJeeper said:
How do I check the coil?
Click to expand...


Usually I'm never a fan of blindly throwing parts at something to see what fixes it, but when it comes to ignition coils there aren't many diagnostics that you can do. The only easy things you can check are things that would affect the coil all the time, like shorted insulation or something like that. If you're talking about something that's temperature dependent, or RPM dependent, etc., there isn't much you can do besides replacing it and seeing what happens. High voltage is really nothing you should mess with, so when the engine is running then leave the coil alone. Camrys have fairly common coil problems, and Avalons share a lot of the same parts, which is the reason I'm suggesting the coil as a possible suspect
 
I finally took it to the Toyota dealership and let them look at it. My wife follows me over to the shop and the check engine light conveniently clears off right when we pull in.

We let Toyota keep it for two days and the tech drove it until the CEL registered again. The tech decides to swap it out to a DENSO brand MAF and low and behold the ghost of grandmas last ride is back to full grown V6 glory. The Avalon is back to being peppy, idles smoother, starts faster, and blows through its full magnificent powerband above 4,000 rpm and beyond.

TL:DR
Don't buy AutoZone Mass Air Fuel sensors for a Toyota Avalon


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Uhh, CEL going out shouldn't erase the code stored.. although likely they wanted to reproduce the problem to verify repair to prevent misdiagnosis/comeback.
 
Fabrik8 said:
Usually I'm never a fan of blindly throwing parts at something to see what fixes it, but when it comes to ignition coils there aren't many diagnostics that you can do. The only easy things you can check are things that would affect the coil all the time, like shorted insulation or something like that. If you're talking about something that's temperature dependent, or RPM dependent, etc., there isn't much you can do besides replacing it and seeing what happens. High voltage is really nothing you should mess with, so when the engine is running then leave the coil alone. Camrys have fairly common coil problems, and Avalons share a lot of the same parts, which is the reason I'm suggesting the coil as a possible suspect
Click to expand...

SCOPE!
I doubted the coil was causing a lean code without a misfire, but if you want to know it's health it's best to throw a amp clamp and secondary probe on it. Some really cool new toys available if you don't have a scope! Amazon.com: GTC GTC505 Engine Ignition Analyzer: Automotive

Were the fuel trims and oxygen sensor voltages mentioned anywhere? Often times that's how we catch a MAF failure.
Parts store electronics SUCK! We only use OEM if possible.

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