Question about 1994 Mitsubishi Mirage

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Mitsubishi Mirage 94 at idle fails

I changed the fuel pump, filter, regulator, computer (ECM) , TPS (Throtle position sensor) Map sensor, spark plugs, rotor, ignition cables, alternator, battery, runs great at high speeds but hesitates, almost dies at idle. The check engine light never goes on (well, at start-up the light checks o.k.)
This 94 model has he connector for the diagnostics tool, I have one BUT cannot read those because almost all readers starts at 1996. (OBD tools)

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It sounds to me like the ICM ( Idle control motor )

Posted on Mar 07, 2010

Testimonial: "I am in the process of this... changing the ICM, I ordered one from Ebay at 100 dollars (cost range from 250 to 350) BUT the gasket was not included."

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Youll have to take it to someone whon has an OBD, not OBD2 hook up.

Posted on Feb 03, 2010

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1 Answer

VERY ROUGH IDLE NO EXCELERATION


Try a few if these ideas...

Priority Action Part Type Cause
1 Inspect Spark Plug Fouled, Damaged, or Broken Spark Plug(s).
2 Inspect Hose (PCV) Clogged or Collapsed PCV Hoses.
3 Inspect Wireset Worn, Damaged or Faulty Spark Plug Wire(s).
4 Inspect Distributor Worn, Damaged or Faulty Distributor.
5 Inspect Catalytic Converter Clogged or Faulty Catalytic Converter.
6 Inspect Fuel Pump Low Fuel Pressure.
7 Inspect TimingSet Slipped TimingChain or Worn TimingGear(s).
8 Inspect Knock Sensor Improperly Connected or Faulty Knock Sensor.
9 Inspect M.A.P. (Manifold Absolute Pressure) Sensor Faulty M.A.P. Sensor.
10 Inspect Throttle Position Sensor Faulty or Incorrectly Connected Throttle Position Sensor.
11 Inspect Mass Air Flow (MAF) Sensor Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
12 Inspect Air Cleaner Temperature Sensor Damaged or Faulty Air Cleaner Tempature Sensor.
13 Inspect Fuel Injector Pressure Regulator Faulty Fuel Injector Pressure Regulator.
14 Inspect Piston Ring Set Worn or Broken Piston Rings.
15 Inspect Timing Specification Incorrect Ignition Timing.
16 Inspect Fuel System Pressure Incorrect Fuel Pressure Being Delivered to Carburetor or Fuel Injection System.
17 Inspect Fuel Filter Clogged or Dirty Fuel Filter.
18 Inspect PCV Valve Plugged or Damaged PCV Valve.
19 Inspect Valve Burned, Worn, or Sticking Exhaust Valves.
20 check idle stop solenoid - if faulty, could cause rough idling
21 inspect distributor cap/rotor - if burnt, could cause loss of acceleration

Apr 18, 2011 | Chevrolet Cavalier Cars & Trucks

1 Answer

I have a 1991 ford explorer 4.0L Eddie Bauer edition. The idle revs to 2000 rpm's and then will drop to no less then 1200 rpm's. If I give it the gas it dies whether I'm in gear or not but when I...


There are several problems and they are all related. Check plugs if they a white with gray ash buildup. Gap .054

1. Fuel pressure regulator, if it is ruptured fuel will be vacuumed straight into the the intake causing idle surge also in causes temperature fluctuation and poor performance. It will also cause lean running condition.
2. The Mass Airflow Sensor also has a huge impact on mixture, defective symptom was a knocking and clattering under load especially uphill. Cleaning will only give temporary fix.
3. Spark Plugs- Do not use Platinum plugs they run hotter than standard plugs!
4. Any intermittent starting problems are likely fuel pump related, when you turn the key in the ignition you should hear the pump running!!
5. Preventive maintenance is the key change your fuel filter at recommended intervals.

I have a 94 Explorer, it run very poorly after changing these items it runs great, restored power, idles great and great mileage again and finally no more temperature fluctuation.

Nov 05, 2010 | 1991 Ford Explorer

2 Answers

Starts and dies on acceleration then will not run


crank shaft position sensor is most likely cause. Do check ignition and fuel pump relays with an ohmmeter to make sure they are not faulty. Check power to ignition module. You can also check crank sensor with the ohmmeter. Check all vacuum hose and also check throttle position sensor.

Nov 15, 2009 | 1995 Geo Metro

1 Answer

How can i tell if my ignition is going bad i can crank it over but as soon as i start to drive it shuts it self off


First, make sure all your ignition components test out good; ignition coil, spark plugs, plug wires, power transformer, and even your alternator and battery.

Next, check your fuel system; fuel pump, fuel filter, fuel pressure regulator, and even your fuel injectors. Many times a clogged fuel filter can cause idling and hesitation problems. Also check for any restricted air passages starting from your air filter, all the way to your throttle body and EGR valve.ry checking the tps sensor (throtle positioning sensor). if the tps sensor is not working right when the engine warms up the tps sensor will not allow the fuel pump to pump as much as it needs to keep the engine running. The reason it only happens when the engine warms up is because the throttle is chocked when the engine is cold so it does not take as much gas to run it.

Aug 21, 2009 | 1985 Ford Ranger

1 Answer

Chevy fuel problem?


try checking how much fuel preasure you are getting under the hood, there is a valve that looks similar to a tire valve that you screw a guage onto, that engine must recieve no less that 60 psi fuel preasure to make the fuel injectors even fire. try replacing the fuel preasure regulator.

Jan 26, 2009 | 1995 Chevrolet Blazer

1 Answer

1993 pontiac grand prix 3.1 liter


the 3.1 had some EGR problems, EGR valve stuck open, blown diaphrams, Plugged passages Im not saying that is all your problems and I believe yours has whats called a linear EGR about $350.00 from the dealer (and that is the only place you ever consider buying such a critical part for the emissions system regardless of the cost)
That car is so antiquated as far as computers go that relying on the codes is nearly pointless! Map code can set because of low engine vacuum which you will have with a poor running engine, Check for 5 volt reference voltage at the TPS and MAP with the key on and engine off if no 5 volt reference I suspect a Computer. Computer Ground is on the Thermostat housing and needs to be clean and secure.
There is a legit test in the GM factory manual called the TAP TEST take the ECM (computer) and slap it with an open hand, if the symptoms change the ECM is bad it's very common in the early-mid 90s for the computers to go bad in one way or another the circuit boards come loose and suffer also from cold solder joints.
Make sure the wires are on the correct plugs and hopefuly you used factory plugs and wires and No split fire or bosch plugs only AC delco
Make sure you have good spark on all 6 cylinders.
Contact me at fixincars@yahoo.com with the results and any feedback or questions

Sep 19, 2008 | 1993 Pontiac Grand Prix

2 Answers

2003 dodge ram p/u 1500


I would think the idle speed control valve is defective.

Sep 16, 2008 | 2004 Dodge Ram

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