Car stays reved at 3 thousand rpm , any help?

wicked6 · 9-17-10, 20:54

So today i let my sister use my car ( bad idea ) and when she gave it back to me as soon as i started the car it immideately shot up to three thousand rpm . if im in gear it dose not do this , only when the clutch is in ( or neutral ) . ive done some reading and ive seen that it could be the throttle position sensor. anyone have the same problem?

**goodsonjarrett** · 9-17-10, 23:20

yes here is the vid to prove it

YouTube - mx6 problems

**goodsonjarrett** · 9-17-10, 23:21

i found out it was a sensor... code 9 on my obd1... (coolant temp sensor) un plug it when the car is ruining and it should drop the idle its 16.00 bucks to fix it.. but if not i don't know what it could be

**H_Type** · 9-18-10, 0:31

is your throttle cable going all the way back to rest position?. under the hood..

wicked6 · 9-18-10, 11:21

i am not getting any codes . last nite i unplugged the tps and it still stayed reved at 3k. And yes the cable seems to be in the rest position . Im sorta stumped . Is it possible that it can be the crankshaft position sensor? Any other ideas?

wicked6 · 9-18-10, 11:40

Ok , so i just went outside and found what i hope was the coolant temp sensor . Its located on the thermostat housing and has a little ground wire beside it . I unplugged the sensor and the car had trouble starting , once it did start the rpm was alot lower then what it originally was . I had to somewhat keep my foot on the pedal to keep it alive . But after about 15 seconds of giving it very minimal gas , it went back up to 3 grand and stayed there.

**goodsonjarrett** · 9-18-10, 12:19

umm that's crazy im not sure what it could be it could be the tbs but ask your sis when it stated that... and what she was doing at the time... maybe the timing belt but look around at some shops and see what they think...

**H_Type** · 9-18-10, 23:29

haha its not a timing belt. Not a crank sensor, or it would take a long time to start. You will not get any codes from this car at least not easy. Beginning OBD2 = no info. Is this a Automatic tranny? Have you cleaned your IAC? IAC sounds stuck- I can send you a good one I have 3. But it will cost you 30 bucks shipped. It could be coolant sensor check resistance to see if its to spec. If its ok It could be a Intake manifold gasket leak, or bad EGR. Have you checked your egr valve? disconnect it to see if there is any change.

**tjvjr** · 9-18-10, 23:58

check your coolant level and check for air in the system , well "burp" it. it sounds like air in the iac.

wicked6 · 9-19-10, 14:48

Its a 5 speed manual . I disconected the egr valve , nothing still the same . coolant level is fine . I unfortunately dont have a ohm testor so i cant test the resistance . And im pretty sure that i was looking at the correct collant sensor . Correct me if im wrong but it is on the passenger side of the engine? Im not 100% techinically advanced so bear with me :P. If that is the correct sensor then i did as goodsonjarett told me . I let the car run and unplugged the sensor , nothing . Im gonna purchase a ohm testor tommorow and check the resistance . But any other suggestions would still be greatly appreciated. Thanks!

**mazdaboyracer** · 9-19-10, 16:20

Check your idle speed screw. It's on top of the throttle body towards the firewall. It needs to be only a rotation or two away from fully closed. You need to put the car in diagnostic mode by jumping the TEN and GND in the diagnostic box; under the hood behind the battery.
Also use the diagnostic mode to check your timing and see where it is at. Also to check your TPS when in diagnostic mode; lightly pull the throttle cable and the fans should immediately come on. This means the TPS is in the correct position.

**tjvjr** · 9-19-10, 16:34

let the car run a few minutes and unplug the iac sensor and see if the rpms drop.its above the throttle cable on the tb ,small black plug. if that doesn't help unplug the maf and see if the rpms drop.

wicked6 · 9-19-10, 18:51

tvjr , is there a way you could somehow post a pic on here of what the iac looks like? i couldnt find it .
Mazdaboy racer , i cant really figure out how to use the diagnostic port :P . Howeever i beleive my timing is ok because the car does not take a long time to start and it still has all the same power as it did before . But hey im probably wrong lol . if i cant figure out what it is withing the next week im just gonna take it into the mechanics .

**tjvjr** · 9-19-10, 20:20

generally when something like this happens suddenly its usually a sensor failure or connection ect. here is a pic (please excuse the quality) - [IMG]

Uploaded with ImageShack.us[/IMG] if you need any more info let me know.

**mazdaboyracer** · 9-19-10, 23:00

I mean the ignition timing. It really doesn't matter to the ECU but, it can make the idle vary some.
Also tjvjr... he never specified if it was I4 or V6. There are some differences.