NEED HELP! Engine probs...

foxy_fto · Post by **foxy_fto** » Wed Dec 03, 2003 10:26 pm

I own a 2.0L V6 Mivec Tiptronic
GPX model, my engine keeps revving high and low. This happens frequently but sometimes disappears for awhile. I have changed the idle control valve TWICE! The car seems to go ok for a while but then it begins to bounce, this problem is dangerous cause at times when i'm stopped at lights the problem seems to over right the brakes and the car jolts forward.

After 6months of this on and off i'm almost ready to give up!!
Has anyone ever experienced this? I need help because the mechanics keep stuffing around and my poor baby is still unwell after so long!

kaveman · Post by **kaveman** » Wed Dec 03, 2003 10:56 pm

hey foxy fto

welcome first

second where are you if in sydney give hills motor sport a call ph 02 88020777

talk to markus he should be able to help

robert

HEK-71Q · Post by **HEK-71Q** » Thu Dec 04, 2003 4:00 am

yeh i knoe what ya sayin... it happens to me at times. my idle rises at times as well.... i adjust my afc at times to fix it up....
but still it aint the solution....

Daz_FTO · Post by **Daz_FTO** » Thu Dec 04, 2003 10:17 am

You've had the valve replaced twice... maybe it isnt the prob. Cars are overall simple things - air plus fuel plus spark makes car go. Revving high - means the car thinks you have put the foot down or something.

I am just thinking out loud here, but could it be an automatic choke problem? How far does it rev out to? Is it like when you first start the car on a cold day - 1200+ rpms, or is it something stupid like 3000+rpms.

I am not sure how the throttle system is set up on our cars, but the only way an engine will rev higher is if it is getting more fuel - or is that the idle control valve's job? Sometimes a computer reset helps when you reaplce parts - did they do that? Does it happen daily, weekly, monthly? My gf's astra had issues with "missing" occasionally (new car). THey erplaced crank angle sensor and a whole number of other things and it turned out to be simply a computer glitch that needed to be reset. It took them 5 months to figure that one out though.

Hope this jibberish helps a little.

markyboy · Post by **markyboy** » Thu Dec 04, 2003 11:01 am

Would an air leak not cause this to happen also.Causing more air will make the management system dump in more fuel, or am i totally wrong here..

payaya · Post by **payaya** » Thu Dec 04, 2003 6:19 pm

try your trottle position sensor, its located right on the throttle body.

payaya · Post by **payaya** » Thu Dec 04, 2003 6:20 pm

try your trottle position sensor, its located right on the throttle body.

KEA7IN · Post by **KEA7IN** » Wed Dec 10, 2003 12:12 am

When you have this problem is your `N `neutral light flashing on the dash
and possibly staying in third gear instead of changing down to second. next time you have this problem just have a look
at the gear lights on the dash thats if you got trip auto.
if so you may be going into limp mode.

Jase · Post by **Jase** » Wed Feb 04, 2004 3:32 am

I've got the same problem. Apparently it's the idle control but my mechanic is having problems finding the right one. Mitsubishi have sent 3 diff ones with no luck. If anyone can give me a part no for the right one that would be great.

KEA7IN · Post by **KEA7IN** » Thu Feb 05, 2004 12:31 am

Hello Jase
is your prob reving
or
flashing N

Jase · Post by **Jase** » Thu Feb 05, 2004 7:14 am

Idling. It ranges anywhere from 500rpm to 1200rpm. Has surged a couple of times while driving of late. My mechanic was sent two different ones from mitsubishi and they were both wrong. Hopefully it's just a matter getting the right one and presto, problem solved.

Simon · Post by **Simon** » Thu Feb 05, 2004 1:51 pm

Hi guys

You can get an Idle Speed Controller from any mitsubishi wrecker. It's the same as the Lancer, Mirage, and Magna. Just take the old one in to double check.

A good way to check if your ISC is working is when the car is cold, take the ISC off and hold it in your hand while someone else turns the ignition on (do not turn car on) If the plunger retracts into the motor, you know at least it's receiving a signal from the ECU.

Back to Foxy's question

Eratic idle is probably caused by your ISC but it may not be a faulty ISC especially as you have bought 2.

Check the wires going into the Idle speed controller that they are still in tact. Check them well, I had a broken wire on mine which wasn't visible unless I took the plug right off and turned the plug around in my hand.

Check the throttle position sensor as suggested earlier. The ECU will open the ISC if it thinks the throttle is open.

There are a number of other sensors that control the ISC such as the coolant temperature sensor. Perhaps ask your mechanic about them

Unfortunately it's not an easy problem to diagnose and some mechanics don't have a clue what they're doing.

KEA7IN · Post by **KEA7IN** » Thu Feb 05, 2004 3:13 pm

I also resolved an idleing problem
by cleaning the carbon of the stepper motor i found a tutorial in this forum i think on where to find it and what to do. just do a search for stepper motor.
it's an easy free twenty minute job which may help.

MiVEC · Post by **MiVEC** » Thu Feb 05, 2004 9:04 pm

i think i got a same problem as you last time. ithe problem start when i start the engine and i heard "sshhhh" sound from under the hood. after that my car is revving high and low. the next day i found out that 1 of the air intake cable that goes into the head (under the engine cover) isn't pluged in properly. so i just thighten it, and it fix the problem..

Jase · Post by **Jase** » Mon Mar 29, 2004 3:37 pm

My mechanics had my computer this week getting tested and it came back ok. So they traced all the wiring and turns out it's a faulty temp sensor causing it to run too rich or lean at idle.

payaya · Post by **payaya** » Mon Mar 29, 2004 6:09 pm

Simon wrote:Hi guys

You can get an Idle Speed Controller from any mitsubishi wrecker. It's the same as the Lancer, Mirage, and Magna. Just take the old one in to double check.

A good way to check if your ISC is working is when the car is cold, take the ISC off and hold it in your hand while someone else turns the ignition on (do not turn car on) If the plunger retracts into the motor, you know at least it's receiving a signal from the ECU.

Back to Foxy's question

Eratic idle is probably caused by your ISC but it may not be a faulty ISC especially as you have bought 2.

Check the wires going into the Idle speed controller that they are still in tact. Check them well, I had a broken wire on mine which wasn't visible unless I took the plug right off and turned the plug around in my hand.

Check the throttle position sensor as suggested earlier. The ECU will open the ISC if it thinks the throttle is open.

There are a number of other sensors that control the ISC such as the coolant temperature sensor. Perhaps ask your mechanic about them

Unfortunately it's not an easy problem to diagnose and some mechanics don't have a clue what they're doing.

how much are stepper motors from the wreckers?

Post by **smorison** » Mon Mar 29, 2004 6:37 pm

you can be reco'd units from kempy's ... www.kempys.co.nz they have pretty reasonable pricing normally.

Adriano · Post by **Adriano** » Tue Mar 30, 2004 1:08 pm

oh and i mentioned in another thread that you can recondition your ISC for $110 with 6mnoths warranty... havent done mine yet as the problem seem to have gone away.. i just cleaned the Throttle body a little....

foxy_fto · Post by **foxy_fto** » Tue Mar 30, 2004 2:23 pm

hey all
after a few months, i finally found a great mechanic who fixed it first go! It was the idle control valve! He knew the right one straight away. So if your mechanic doesn't get it right first time look for another..... otherwise you'll be wasting time and $ like i did.

oakleaf · Post by **oakleaf** » Fri Apr 09, 2004 6:20 am

Hi All

1st post for me !!!!!

Engine coolant temp sender is a common fault as is the ISC/stepper motor.

Personally I would NOT buy a recon unit just bite the bullet and buy a new one.

Mitsi changed the stepper design.
If you still have the brown ICS then expect trouble.
Suggest you Aussies buy from http://www.nardek.com.au/isc.htm

We sell about 5 a week of thes things and several engine coolant temp senders

Mike

FTO AUSTRALIA

NEED HELP! Engine probs...

NEED HELP! Engine probs...

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