Mitsubishi

Mitsubishi repair problems? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

Mitsubishi Diamante LS: I have a 2003 Diamante. It does not…

Customer Question
I have a 2003 Diamante...
I have a 2003 Diamante. It does not seems to be idling up when you turn the ac on or when you put it in gear. I just replaced the tps and still have the same problem. Any suggestions?
Submitted: 3 years ago.Category: Mitsubishi
Show More
Show Less
Ask Your Own Mitsubishi Question
Answered in 7 minutes by:
6/5/2015
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 3 years ago
Doug
Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 8,659
Experience: Mitsubishi employed and Factory trained ASE certified technician
Verified
Hi,
Is it the TPS you replaced or the IAC (idle air control) valve? The IAC is what is responsible for idle-up operation.
Ask Your Own Mitsubishi Question
Customer reply replied 3 years ago
It was the TPS. Is there a way to test or clean the IAC valve before replacing it?
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 3 years ago
Thanks... we definitely need to look into that IAC then.
When you turn the AC on, there is definitely no idle-up before the compressor kicks on right?
What about if you pull the steering wheel hard to one direction and hold it... does the idle go up or go down when the steering load is added?
Ask Your Own Mitsubishi Question
Customer reply replied 3 years ago
Correct. No idle up when ac is turned on. Also, when I pull the steering hard to one direction and hold it there is no change in the idle. Also I meant to mention that when we are at a stop light it will shut off unless we hold the brake with one foot and give it a little gas.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 3 years ago
Thanks.
The stop light issue can sometimes be just a dirty throttle, however with no idle up occurring we know that issue takes precedence over it as it could affect both conditions.
Lets go to the IAC and check it out. You'll need to take the intake duct off then the IAC is held on with three screws directly below the throttle opening.
Take it off and clean it, then use your fingers to gently but steadily force the pintle closed. Reinstall the IAC and see if your engine revs high and does not drop normally.
Ask Your Own Mitsubishi Question
Customer reply replied 3 years ago
Ok. I took it out but I am unable to push the pintle closed.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 3 years ago
Thanks.
If you are unable to push it in that is a pretty good indication that it is frozen. While not "easy" to push in, with steady force and at most a little wiggling it should go in. If it can't go in for you, it likely can not go in for the computer either... your hands provide a lot more force than the tiny electric motor inside it.
Before doing anything else lets get a new IAC in there. Take the opportunity while it is out to clean the passageways and the throttle opening, then get the new one in there. Short of anything REALLY unusual like a computer or wiring failure, this should take care of you. Not being able to move it by hand just further seals the odds.
Ask Your Own Mitsubishi Question
Customer reply replied 3 years ago
New TPS and new IAC. Still having the same issue. What do I try next?
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 3 years ago
Just to be clear, the throttle is clean, the IAC is new, and the key problem is that you are not seeing any idle up under load or when stopping etc? If that is correct, the problem did not change in any respect at all, right?
Was there anything abnormal about the connector to the IAC? Was the IAC new or used? If new, was it from a respected brand?
Ask Your Own Mitsubishi Question
Customer reply replied 3 years ago
That is correct. Nothing has changed. Connectors looked fine. The IAC was new. The brand was BWD.
Customer reply replied 3 years ago
Cleaning the throttle was the very first thing I did.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 3 years ago
Hmm.
Lets pull the IAC out but leave it plugged in. Have a helper turn the key on (but not start the engine). Can you feel the IAC hum and move slightly? If not, turn the key off and move the pintle out all the way by hand then turn the key on again, does the pintle retract?
Ask Your Own Mitsubishi Question
Customer reply replied 3 years ago
Just followed those instructions. It did move out slightly when turned on and retracted when turned off.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 3 years ago
Thanks, ***** ***** is working then.
Are you sure there isn't anything else worth mentioning about the situation, like someone modifying the throttle stops trying to "fix" the situation previously etc?
Ask Your Own Mitsubishi Question
Customer reply replied 3 years ago
We put a simple code reader on the vehicle and saw codes 101, 401 and 403. We. We also used MAF cleaner and cleaned the MAF even though it did not appear dirty.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 3 years ago
None of those codes would have anything to do with idle up not working. Seeing as the iac is working outside of the throttle, let's put it back together and recheck operation... It should be idling up now.
Ask Your Own Mitsubishi Question
Customer reply replied 3 years ago
Everything is back together and there has been no change in operation.
Mitsubishi Mechanic: Doug, ASE Certified Technician replied 3 years ago
There really isn't any reason that should be unless something is being left out. The idle up is performed by the iac which is now working and no longer seized. The idle up is commanded when the ac or the power steering is used and neither is causing it to work... Making it unlikely to be signal related since there are two separate unrelated signals and neither would be working.
You know the wiring is okay as again it is verified working.
You could expect a computer failure to cause this, particularly knowing the old iac was seized, however again the iac is verified working meaning the computer is doing its job.
Again with the idle up specifically there really isn't anything else to consider. While you can have other problems cause similar drivability issues, the actual idle up process is extremely narrow in operation, and everything is checking out.
What I would have to do at this point would be to get the throttle body calibrated as all I can imagine is someone tinkered with it trying to fix a problem in the past perhaps. Any shop with a professional grade scan tool can do this by activating the SAS or base idle function, then dialing in the idle while the function is active.
If there is still issue while everything is calibrated I really wouldn't have anything else to suspect but a very strange and very unusual computer problem.
Ask Your Own Mitsubishi Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a mitsubishi mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Doug Your Own Question
Doug
Doug
Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 8,659
8,659 Satisfied Customers
Experience: Mitsubishi employed and Factory trained ASE certified technician

Doug is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

Meet the Experts:

Doug

Doug

ASE Certified Technician

8,659 satisfied customers

Mitsubishi employed and Factory trained ASE certified technician

George H.

George H.

ASE Certified Technician

317 satisfied customers

ASE Master tech 15+ years

Jake

Jake

Automotive Technician

213 satisfied customers

Experienced collision repair technician, Pulaski Tech graduate and DSM hobbyist.

Tim Mohr

Tim Mohr

ase master

209 satisfied customers

30 yrs foriegn and domestic, gas and diesel

Chris (aka- Moose)

Chris (aka- Moose)

Technician

206 satisfied customers

16 years of experience

Mike Kelly

Mike Kelly

Mitsubishi Mechanic

104 satisfied customers

17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.

AMD

AMD

Master Technician

48 satisfied customers

L1 Advanced Level Diagnostics Specialist

< Previous | Next >

Related Mitsubishi Questions
2003 Mitsubishi Diamante 3.5....does the ECM in this vehicle
2003 Mitsubishi Diamante 3.5....does the ECM in this vehicle have the transmission control module incorporated in to it. I have been told that this ECM is specific to this year only? True or False? Th… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
I need help i repaired fuel asslemly and filter i cant find
hi i need help i repaired fuel asslemly and filter i cant find fuel kill switch car wants to start but its not … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
5,891 satisfied customers
2003 Mitsubishi Diamante 3.5 .... i need a pic showing the
2003 Mitsubishi Diamante 3.5 .... i need a pic showing the location of the 106 pin of the powertrain control module and how it connects to the under drive solenoid in the transmission. Color coded if … read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
206 satisfied customers
Doug, I need your guidance again. My 2003 Galant 2.4 is having
Doug, I need your guidance again. My 2003 Galant 2.4 is having issues with the throttle system. A couple weeks back, the car refused to cold start. It would start if I gave it peddle, but died as soon… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Mitsubishi 3000GT: , I have a 1994 3000gt base which idles
Hi, I have a 1994 3000gt base which idles rough when in gear seems to idle low. Park / Neutral it idles fine. Never stalls, drives great and does not loose power when driving in stop and go or on high… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Mitsubishi Eclipse GS: Yes I have a 2003 mitsubishi and It
Yes I have a 2003 mitsubishi and It lost idol when battery died. I cleaned throttle body and mas also checked all fuses now I lost… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Hi Jake, I was driving my wifes 2003 Mitsubishi Eclipse Spyder GTS the other day to
Hi Jake, I was driving my wife's 2003 Mitsubishi Eclipse Spyder GTS the other day to work and it stalled almost every time I came to a complete stop. The idle would drop to about 600 for a second or t… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Mitsubishi Diamante LS: hey Doug this is Dan we talked online
hey Doug this is Dan we talked online about a week ago about my 2004 Diamante stalling at idle when I come to a stop. I cleaned the throttle body like you said and drove it about 100 miles w/ no probl… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Mitsubishi Eclipse GS: Have 1995 eclipse 2.0L: gs. It stalls
Have 1995 eclipse 2.0L: gs. It stalls intermittently after the engine warms up. This occurs at different speeds/rpms. Has no problem restarting. Idle is occasionally erratic. Sometimes feels as though… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
mitsubishi eclipse: I have a 1993 mitsubishi eclipse non turbo
I have a 1993 mitsubishi eclipse non turbo 2.0L and when I star my car the rpm go up to warm up but once start coming down the rpm bounce from 500 to 1000 rpm and when I run the car I have no problem … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Mitsubishi Pajero IO: I have a 2000 Pajero IO. The jeep sometimes
I have a 2000 Pajero IO. The jeep sometimes loses power when in first gear with gas pedal to the floor. I have had suggestion of tps sensor. Jeep also idles very high. Additionally I had an issue with… read more
indy-tech
indy-tech
Shop owner, technician
Vocational, Technical or Trade Scho
11 satisfied customers
Mitsubishi galant: I have a 2003 galant. Car wants feels like
I have a 2003 galant. Car wants feels like it wants to die at idle or under 1500 rpms. Drives fine right now at speeds above 45. Had a lesser bout with this about a month ago and mechanic said plug in… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Mitsubishi Diamante ES: 2000 diamante question, (part 2) if
2000 diamante question, (part 2) if it is the throttle sensor how do i not if it is with or without traction Part1- when driving the car stays in one gear. some time it drives it normally. Once in dri… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
Mitsubishi Eclipse GT: I have a 2001 Eclipse 3.0 V6, I recently
I have a 2001 Eclipse 3.0 V6, I recently changed the spark plug, along with the cables, and the distributor cap. After putting the car back to gather, the car would not start. I took the battery to be… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
2000 eclipse gt: v6 with idle problems idles fine..map sensor and pcm
I have a 2000 eclipse gt v6 with idle problems idles fine without air when loaded down idles at 400 to 500 rpm replaced map sensor and pcm worked for a while… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,659 satisfied customers
93 Mitsubishi diamante: gas pedal..fuel pump..same problem
My 93 Mitsubishi diamante runs but won't idle I have to put my foot on the gas pedal a little to keep it running. I replaced the fuel pump and it still has the same problem. What could it be?… read more
indy-tech
indy-tech
Shop owner, technician
Vocational, Technical or Trade Scho
11 satisfied customers
2003 Mitsubishi Diamante: I warmed..dealership..automatic transmission
I own a 2003 Mitsubishi Diamante and live in Dallas, TX. This past winter we experienced very cold temperatures and the vehicle would not drop into ANY gear unless I warmed up the car for at least 15 … read more
HondaPlatinum
HondaPlatinum
High School or GED
148 satisfied customers
Mitsubishi Diamante ES Were is the idle control valve on a
Were is the idle control valve on a 94 diamante mitshubishi need to replace the idle is fluctuating wehn i stop with the a/c on but not when the a/c is not runinng is this the problem?… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x