Idling at 2K

[2kcelicaGT]

well, just driving around, and all of a sudden noticed something was wrong with the engine, it started idling at 2000 RPM, and wouldn't go down, i was like WTF, for like 30 mins tried screwing around with the cord/wire that adjusts the tension with the accelator pedal and the throttle...this didn't seem to help then all of a sudden after letting it sit like 30 mins, turned the car back on and it almost stalled out, i think it would have it i hadn't pumped the acccelator...so i adjusted the tension of that cable again so that it was idling at 800-900 RPM with a warm engine like it usually does, and it seems fine now i guess, wtf happened, ECU trouble? does something need to be cleaned, people are always talking about cleaning the MAF or something like that, maybe my O2 sensor, dont really know what i am talking about when it comes to engine stuff, no engine light and the only real mods done to my engine are INJEN RD CAI and Tanabe Racing Medallion exhaust, any suggestions, i think i am gonna take it to the dealer and see what they say, i decided not to reset the ECU so maybe they can diagnose the problem...I had also taken it in a while back b/c of an engine light and they said that I needed a new catalytic converter b/c it was giving out bad reading or something, could this have anything to do with it, and if it doesn't, could this be affecting my performance in any way...the engine light went off about the catalytic converter problem a few days later, so i havent fixed it yet, please help me, thanks, Tim

[2kcelicaGT]

ttt

[2kcelicaGT]

also, it does it when i have it rolling back in reverse, and pop it in first gear, and slam the gas, like manouvering to get into a parking space...the sequence goes...reverse back up, still rolling back, pop it into first and slam the gas so it jumps/moves forward again, and i heard a "pop"/"thud" when that happens, and thats when my RPM climbed to 2k again at idle...its kinda fine now, sometimes climbs to like 1100 when i am stopped, then drops to like 500...i dono whats going on, help

[2kcelicaGT]

ttt

[Da Kine Guy]

mine idles at 2k in the morning. I dunno, I think it's just to warm the engine up faster, my old Corona does the same thing, its just mechanical in design instead of computer controlled. After I get on the road, however, the car idles at 800 or so.

[Griffin]

Hmm... 2K is the default idle if it looses connection to the MAF but that should pop a CEL right away. The only thing I can think of that might do that otherwise is a massive vacuum or intake air leak somewhere or maybe the purge solenoid for your evap sticking open... I guess if your Coolant temp sensor had a loose or shorted connection and teh ECM thought the temp was dropping super cold for whatever reason that might do it... and a loose wire might bet stretched when teh engine slams around liek you were describing...

If I were you I'd go down to your local electronics store and pick up a can of electrical component / contact cleaner and clean your MAF wires off. I'd also check yout wires and connectors on the MAF and coolant temp sensor and stuff - wiggle em around and see if anything is loose. Also check your CAI and see if maybe its loose or cracked anywhere.

BTW - your throttle cable should be adjusted to where theres a small amount of deflection available with the engine on at idle... If the throttle is not contacting the throttle stop the cables too tight. if you can wiggle the cable up and down like 1/4 inch or more without affecting the throttle position its probably too loose. It DOES need that little bit of freeplay though so that if the cable housing gets jostled its not so tight that it moves the throttle.

Just as an FYI - The Cat problem wouldn't have anything to do with this - the Catalyst efficiency code P0420 is probably what was set and does not effect engine operation unless teh cat has slagged itself and is actively restricting exhaust flow. But nothing the cat does is gonna cause a 2K RPM idle

Griffin

[GTS LAID]

it could also throw 0420 if one of the evap lines wasnt connected... thats what happened with mine.. somehow one became loose.. anyway i ended up with 0440 and 0442 had the gas tank running atmospheric pressure.... not a good thing from what i was told by the tech.

[Griffin]

Originally posted by GTS LAID
it could also throw 0420 if one of the evap lines wasnt connected... thats what happened with mine.. somehow one became loose.. anyway i ended up with 0440 and 0442 had the gas tank running atmospheric pressure.... not a good thing from what i was told by the tech.

I don't want to start an argument, but no it Can't P0420 is a Catalyst efficiency code - nothing to do with EVAP. It sets because the Sub-O2 sensor waveform too closely mirrors the primary O2 sensor indicating that the catalyst isnt doing its job.

Celicas can only throw P0440 P0441 P0442 and P0446 for evap leaks.

Griffin

[GTS LAID]

whoops.. those are the ones i meant... 0440 and 0442

oh i even said 0440 and 0442 in the paragraph but i mistook it for 0420...

you're completely right... now i remember 0420.. its the one that they req. you to use an oscilloscope with and match the O2 waveform to the one that they show in the manual as part of the diag procedure..

damn dude.. you're on the boards alot these days... you know a lot and your help is def. appreciated around here... i just hope that you dont lose interest quickly and burn out.

[Griffin]

He he - I'm supposed to be cleaning the house now for a friend flying in tomorrow - this is just more fun ;) I'll try to hang out on a continuing basis - can't gaurantee anything but I love nothing more than engines and the 2ZZ-GE is just SUCH a sweet lil design :) - I just hope teh technology makes its way to teh 4.7 V8 some day... if they maintain the same horsepower to weight ratio that would be a 470 horse monster :)

Griffin

[Maelfyn]

If you have an S-AFC you might have the wrong sensor type plugged in. I can make my car idle at 1800 all the time with my s-afc... if I wanted to :p

[Griffin]

Originally posted by Griffin
I just hope teh technology makes its way to teh 4.7 V8 some day... if they maintain the same horsepower to weight ratio that would be a 470 horse monster :)

Griffin

Rofl I said horsepower to weight, meant horsepower to displacement.

[2kcelicaGT]

thanks guys, sounds like cleaning a few sensors or checking connecttions of wires is my next step, though for now its seems fine again, only does it once and a while, thanks!

Tim

[RJpinoyGQ1]

dood im having a similar problem,

tried the whole "tighten your throttle cable" and i think i juss messed it up. first gear feels fine but when i go to second i feel no power. juss installed my aem cai and i feel like i lost hp. when i tried tightening the cable, my car idles at around 1k. but when i step on the gas, i get high rpms but rarely ne mph. i cant even get pass 65 mph.

im thinking about readjusting the throttle cable again hoping i do it right this time, and clean the mafs sensor w/ a q-tip like ive been reading.some one wanna give me tips?

AIM: RJpinoyGQ1