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Car loses power at operating temp

 
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Old 06-25-2013, 06:18 PM
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Car loses power at operating temp

Hey guys, I'd like to start by saying that I tried searching, and read all of the stickies, but couldn't really find an answer. If this has already been covered, then I'm sorry. Anyway...

I've found that my 5th gen jumps like a rabbit when I'm first starting it up (have to resist the urge to take advantage while it's cold), but after it gets up to operating temp, it feels hesitant and weak, especially when starting from a red light, etc. My temp gauge reads at a little below half when I'm driving (all the way down when I first start it up at ambient temp).

I don't have any real idle issues, but when it's at temp, I notice that the idle is just a tad lumpier than cold. I wouldn't say it's enough to call it an idle problem, but there's that.

From what I can guess, I'm assuming this is a problem relating to some type of sensor or the ECU, since the car runs great with a reset ECU and cold temp, but I don't have enough experience to know exactly what it might be.

Also, from what I've seen, every time I disconnect the battery to work on the engine (and reset the ECU in the process), she runs like a bat out of hell for a short time (a couple hours of driving or so) and then goes back to being lazy.

Probably unrelated, but I've noticed a handful of times that when shifting into first gear, I'll occasionally hear a distressing metal rattle/clank coming from the front, and it will usually last anywhere between .5 to 1 second before going away.

I'd really appreciate any help, ideas, probable causes, etc. If this has already been covered, feel free to flame, but a link would be greatly appreciated.

EDIT: Checked out the radiator while running, upper and lower tube were warm/hot, and both fans were blowing.

EDIT 2: There is no CEL.

Last edited by Wintergreen; 06-25-2013 at 06:32 PM.
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Old 06-27-2013, 01:18 AM
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Re: Car loses power at operating temp

Ok, so if I'm understanding what I've found correctly, it sounds like the O2 sensor is a plausible culprit.
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Old 06-27-2013, 08:18 AM
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Re: Car loses power at operating temp

u might b right sir lol...if you have a faulty o2, usually makes the car run like poo. also bang on the cat. and see if you hear anything rattling.
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Old 06-27-2013, 01:53 PM
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Re: Car loses power at operating temp

Is it possible for a faulty O2 sensor to not throw a CEL?
Eh, who am I kidding? The car's 144k miles, my brother got it from a dealership at 130k, and I know for a fact he didn't do anything to the car. I have no idea if/when the sensor was replaced. Might as well just get it.
It'll go nice with the phearable ECU I'm planning on getting.

Last edited by Wintergreen; 06-27-2013 at 02:03 PM.
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Old 06-27-2013, 03:00 PM
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Re: Car loses power at operating temp

Quote:
Originally Posted by H22a4Vtec99 View Post
also bang on the cat. and see if you hear anything rattling.
Kicked it lightly a couple times, sure enough, there was a rattle. After hearing that, I took it for a test drive, and realized I've been smelling a sulphur-ish smell that I had thought was just from an old cabin air filter. Thanks for the tip, looks like I've finally found my problem. (Or at least ONE of them lol)
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