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) …

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,…

Ok, I’ll start looking for one now just in case. Thanks again!

So…crazy thing happened! It snowed this weekend! So, i didnt do anything LOL…next weekend

So, i’ve cleaned the MAF sensor, and…it got WAY worse! Now it will barely go 40mph :frowning: and occasionally completely stops accelerating. Although the engine will still be running…

Checking for a throttle position sensor on the fritz is usually a pretty easy thing for a good inde shop with experience in your make/model to do. I’ve done it myself on my Corolla, took about 1/2 hour. I expect for a Malibu it shouldn’t be that expensive.

@Jasonthedudley , you may want to provide some more details on everything that you did, including double-checking and verifying that everything got buttoned up properly after the MAF cleanings and other inspections. (Tight hose clamps, electrical plugs, mounting screws/bolts etc) @George is right th…

2006 Chevy malibu Symptoms and codes

Maintenance/Repairs

Cavell January 30, 2014, 12:56am 13

Well, if u go to shop and tell tech your car runs bad, has code for tps and cat, he might get a little huffy. Some techs hate customers trying to tell them how to fix car. Usually ends up in a you/me fight. I am curious to see what route the tech will take with you.

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2006 Chevy malibu Symptoms and codes

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