Hello, My name is Jason. I have a 2006 chevy malibu 2.2 ecotec 4 cyl with ~130,000 miles and i am experiencing the following symptoms: Car will not rev past 4000 RPMs or go over 70mph. I do have a check engine light with the following two codes: P0068(throttle position) and P0420(cat efficiency) …

Oh, If I try to push it past 4000 RPMs i get a, “engine power reduced” message and it feels like my car goes into neutral.

It sounds like the cat is at least partially plugged That said, cats don’t get plugged for no reasons Here’s a few things that damage a cat Engine overheated excessive oil consumption ignition misfires leaking injectors Are your plugs overdue? Bottom line . . . the plugged cat is most likely…

Actually, i got a “tune-up” last summer where supposedly they replaced the spark plugs and did some other stuff. Is it possible to root cause the cat problem myself? I dont think my engine has ever overheated, excessive oil consumption i dont know about, i use Mobil one and change my oil about eve…

The P0068 doesn’t mean that there is a problem with the throttle position sensor (TPS). It means that what the computer sees for throttle position is out of whack with what it is getting from the mass airflow sensor (MAF) and/or manifold absolute pressure sensor (MAP). (I think you might have both…

Ok. You’ll just need some basic tools (probably a screwdriver, though a small socket set would come in handy), a can of electronics cleaner, and probably some safety glasses. Attached to the air filter box is that large black accordion-looking ridged tube. It heads to the engine and where it atta…

Good comments above. The TPS tells the computer (or at least is supposed to) the amount the gas pedal is pressed down. The problem could be the sensor itself isn’t reporting that accurately, or that it is actually pressed down the amount sensed, but something else being measured is not consistent…

In addition to all the above, I think in your car, the TPS is attached to the gas pedal and not the throttle body. The throttle body is opened by a little motor. But your problem could be as simple as a vacuum leak. There are a couple of vacuum lines at the top of the throttle body, or very near …

Holy smoke, thats alot of good information. This weekend i’ll follow those steps lined out by cigroller, and keith (checking for a disconnected/damaged vacuum line) and if that doesnt help, i’ll find a shop that will do a backpressure test. I’ll report back with any findings, thanks alot!

Well, after you do all of that, if it makes no difference, then you’re not looking for a back pressure test. What you need next is the good locally owned shop with a good diagnostician to put it on a scantool. With that they will be able to get real time data on what the various sensors are up to,…

2006 Chevy malibu Symptoms and codes

Maintenance/Repairs

Jasonthedudley January 29, 2014, 4:29am 6

I do know where the air filter is! AND I’ve actually removed it once! Please tell me more lol

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2006 Chevy malibu Symptoms and codes

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