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About a year ago I did a tune-up on my 240 just because I'm anal retentive. New bosch cap, rotor, plugs, and OEM bougicord wires. I cleaned the IAC motor, throttlebody, new TB gasket.
The car ran like butter... for a day or two and then my MAF sensor crapped out. It was the original and the car had about 160k miles at the time. Not wanting to spend 180 bucks or whatever it was, I bought a reman MAF from ebay for about 50 dollars. It showed up and looked fine. I installed it and the car ran, but it has never run right since. It sometimes stumbles and shakes at idle when started. And if I have the AC on, it's really hard to get the car moving in 1st gear. With the AC off it feels like horrible turbo lag. ie: the car is unresponsive and then if you floor it it'll finally come to and run.
Top end power is the same as ever (glorious 113hp with 3:31 rear end!) But taking off in 1st and into any other gear you can feel the car lagging.
I've always been curious how to check the MAF to know if it's bad or if the old one died for some other reason, etc... It was weird that I was taking a completely OK running car and trying to make it better and then it died. I'm pretty seasoned on 240s, being the 8th one I've owned and I work on my other cars and motorcycles, etc... so I don't think it's n00b related mistakes.
That said, over the past year if the check engine light has come on it has been due to whatever one means "car is compensating for an overly lean/rich situation"
So should I just buy another MAF sensor and see what happens? Or are there some free things I can double check? I don't have any vacuum leaks that I know of. I looked for them but didn't find anything.
I did have a 'faulty fuel injector' DTC once, but went through and cleaned all the connectors and put dielectric grease on every connector under the hood I could get my hands on. And it has not showed up again.
I will pull DTC at lunch today to see if any stored codes are hiding with no CEL illuminated.
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