The Irish Mitsubishi FTO Owners Club

by **paul2508** » Wed Mar 05, 2008 9:40 pm

hey people, can you please please help me. only since yesterday my car has been cutting out and has irregular revs too. im thinking could it be the stepper motor. the revs are going up and down on its own. then suddenly drops jus below 1000 revs or else cuts out. hope its not too serious. thanks peeps

by **sinlessgunner** » Wed Mar 05, 2008 9:41 pm

Probably the stepper motor. Does it only happen at idle?

by CJ » Wed Mar 05, 2008 9:43 pm

Sounds like the TPS (Throttle Position Sensor) is acting up, has any work been done in and around the throttle body recently? Note that a dodgy stepper will only manifest itself when the engine is cold. Suggest you undertake a diagnostic:

http://www.ftowa.com/html/workshop/workshopart07.html

CJ

by **miss-enzo** » Wed Mar 05, 2008 11:20 pm

mine used do that too when i first got it even when it was warm... got the stepper motor cleaned and have had no problems since (it was over a year ago i had the problem)

by **paul2508** » Thu Mar 06, 2008 9:26 pm

miss-enzo wrote:mine used do that too when i first got it even when it was warm... got the stepper motor cleaned and have had no problems since (it was over a year ago i had the problem)

is it hard to clean the stepper motor. is it worth buying a new one

Website · by **Muad_dib77** » Thu Mar 06, 2008 10:43 pm

Not difficult at all - do a search for stepper motor and you should find the guide.

by **stevec** » Fri Mar 07, 2008 1:00 am

Try an ECU reset, then drive for day.

by **paul2508** » Fri Mar 07, 2008 7:21 pm

stevec wrote:Try an ECU reset, then drive for day.

how mate do ou do that

by CJ » Fri Mar 07, 2008 7:57 pm

paul2508 wrote:
stevec wrote:Try an ECU reset, then drive for day.
how mate do ou do that

Disconnet the negative terminal from the battery for 10 mins.

You never mentioned if the problem occurs when the engine is hot or cold. If its from cold only, its the stepper, if its from hot and cold it could be the TPS.

CJ

Facebook · by **Sebastian** » Fri Mar 07, 2008 7:58 pm

Disconect the battery for at least 30 min . ( somebody corect me if i'm wrong) :roll:

EDIT : CJ we posted at the same time :lol:

by **paul2508** » Sat Mar 08, 2008 11:59 am

CJ wrote:
paul2508 wrote:
stevec wrote:Try an ECU reset, then drive for day.
how mate do ou do that

Disconnet the negative terminal from the battery for 10 mins.

You never mentioned if the problem occurs when the engine is hot or cold. If its from cold only, its the stepper, if its from hot and cold it could be the TPS.

CJ

its when its warm it starts to act up staying in 2500 revs then it starts hunting. the tps? is that major

by **djabie** » Sat Mar 08, 2008 2:49 pm

Had a similar problem myself and it was two months before i found out what it was.
Q. does the engine management light come on before it cuts out.
Q. is it hard to start for about 2 or 3 mins after it cuts out.
Q. does it cut out only on a rough or uneven surface or if you hit a bump.
Q. when its hunting does it stop if you restart the car.

If its yes to the questions i would suggest fiddiling with the M.A.F or vaccum sensor on the bulkhead behind the engine (little black box with rubber tube coming from it) and see if your revs rise and fall or even cut out.
That was the problem with my mivec it wrecked my head for months till one day i found it by accident.
You can pick one up off fleabay for around £30 also check the wiring going to it for breaks etc
Good luck

by **paul2508** » Sun Mar 09, 2008 2:35 pm

djabie wrote:Had a similar problem myself and it was two months before i found out what it was.
Q. does the engine management light come on before it cuts out.
Q. is it hard to start for about 2 or 3 mins after it cuts out.
Q. does it cut out only on a rough or uneven surface or if you hit a bump.
Q. when its hunting does it stop if you restart the car.

If its yes to the questions i would suggest fiddiling with the M.A.F or vaccum sensor on the bulkhead behind the engine (little black box with rubber tube coming from it) and see if your revs rise and fall or even cut out.
That was the problem with my mivec it wrecked my head for months till one day i found it by accident.
You can pick one up off fleabay for around £30 also check the wiring going to it for breaks etc
Good luck

i have no problem starting it back up when it cuts out, the engine management light doesnt come on only the battery light. when im idle its stays in around the the 2000rpm to 2500rpm then it hunts now and again. mostly when its warm

by **djabie** » Sun Mar 09, 2008 2:45 pm

Sorry i cant think of anything else it could be except as mentioned before.
throttle position sensor but it does sound like a vaccum problem.
mainly because of you high engine revs.
Sounds like a job for your local machanic
Sorry i coulnt be of more help.
Good luck

by **paul2508** » Sun Mar 09, 2008 4:37 pm

djabie wrote:Sorry i cant think of anything else it could be except as mentioned before.
throttle position sensor but it does sound like a vaccum problem.
mainly because of you high engine revs.
Sounds like a job for your local machanic
Sorry i coulnt be of more help.
Good luck

thanks for your help anyway mate. really appeciate it

by **stevec** » Sun Mar 09, 2008 5:12 pm

Give Paul Nolan a call, might be able to point you in the right direction.

by **paul2508** » Sun Mar 09, 2008 7:55 pm

stevec wrote:Give Paul Nolan a call, might be able to point you in the right direction.

will do man

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