Question about 2000 Mitsubishi Galant

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COLD START ISSUES- WHEN COLD WONT START WITHOUT PUTTING FOOT ON THROTTLE, OTHERWISE RUNS GREAT

WHEN COLD, WILL NOT START, LIKE IDLE IS TOO LOW, HAVE TO PUT FOOT ON THROTTLE TO START. OTHER THAN THAT NO PROBLEMS WITH FUEL. IS THERE A WAY TO ADJUST COLD START?

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Most cars have a "cold start" sequence that is activated by a heat sensor. There may be 2 sensors with 1 running the temperature gauge or light, and the other operating the feedback to the "cold start circuit".
Go to a good autoparts store and see what parts they have for this circuit. Also check around the throttle for any solenoid which looks like it might step up the idle. Usually, if you have fuel injectors you will not have a step-up Solenoid.

Posted on Jan 26, 2012

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We just got a 2004 Chevy Express. When you start it and put it in gear, it dies. The battery appears dead and you can jump start it.


IAC - idle air control problem possibly .( You can drive it if you use your left foot to brake but keep the gas pedal down to keep the RPMs up.) Wouldn't be a fuel filter , if fuel filter was clogged partly it would idle ,but would lack power ,low fuel pressure at higher speed's . Do you know what IAC valve is ,an how it works ?
Idle Air Control Valve
Or maybe the EGR valve pintle is covered with carbon an sticking open .
Or possibly a dirty or bad MAF sensor - mass air flow sensor - the PCM - engine computer needs info from this sensor so it know's how much fuel to feed the engine .
Hooking up a professional type scan tool to view engine sensor data cut's down on guessing as too what the problem is .

007 Idle Speed Problems Scan Data for Idle

Nov 09, 2017 | Cars & Trucks

2 Answers

VOLVO S80 2000,MY CAR DRIVE'S FINE BUT CUTS OUT AT ROAD JUNCTION'S AND TRAFFIC LIGHTS, CAN ANYONE HELP, THANKS.PS the car has a manual gearbox.


This is just a TOTAL STAB... in the bewilderness...
because you really gave very little INFORMATION...

Hello Jill Dunkley...

If and ONLY if...
your car has an AUTOMATIC TRANSMISSION...

THERE IS A CONDITION where the Fi (fuel injection)
will develop a problem with the COLD-START circuit
(mimics a choke on new cars)... will cause the
IDLE to climb... and heavy shift when put into drive.

Won't pose much of a problem while the vehicle is cold...
but as the vehicle WARMs up...

The RPMs are high enough to reach the "LOCK-UP"
speed of the torque-converter.

With your foot on the brake it will cause the car to stall
as sure as a MISHANDLED CLUTCH under the foot of
rookie driver...

SOLUTION:
Get the vehicle diagnosed...
Fix the COLD START issue to REDUCE THE IDLE SPEED.

Drive safely.

Apr 04, 2017 | Volvo Cars & Trucks

1 Answer

Fuel starvation. If i am idling the car will just die. If I am driving it jolts like running out of gas. mechanics said fuel starvation If i take my foot off gas and put it back on, car is fine.


Well, fine for how long? Until you come back to an idle and it starts all over? Is it constant with the jolting- that probably is fuel starvation- but interesting that it sounds like something resets when you take your foot off and back on.
I can tell you right now that to start, you need to have the fuel pressure tested. The fuel pump has to maintain high pressure in the system at the engine for the fuel injection system to work correctly. Too low of a pressure, because of a weak or worn out pump, will cause fuel starvation, just as you described. This is a simple test and only takes a few minutes, so it should not be expensive to have it done, if you don't have access to a fuel pressure gauge tester.
If the fuel pressure is correct, it could be an injector problem, either mechanically or electrically related, but more likely and less expensive to test, is a problem occurring at the throttle body assembly. There are a couple of computer sensors there that should be checked- the Throttle Position Sensor has a lot to do with smooth acceleration and steady off-idle like high speed driving. This sensor especially needs to be checked. And there is an idle control motor or valve that the computer controls for smooth idle- the IAC (idle air control) system, just a small electrical piece mounted on the throttle body.
I would bet you have a fuel pressure problem, but sometimes your symptoms can be caused by a problem at the throttle body assembly-they all contribute to fuel starvation, or more precise they affect the fuel/air ratio. When that ratio is too far out of whack, it just kills engine performance .

Jun 01, 2016 | Cars & Trucks

1 Answer

1986 Mercury grand Marquis cutting out when slowing down nearly impossible to start. Oil changed, new air filter, new plugs and wires, new fuel filter...?


I had an experience with a 1984 T-Bird with a 302. The 1986 may have the same system. With that car there was a temperature sensor that affected the idle speed once the car was close to warming up.
With even later models there is a "cold start sequence" which is an electronic way of replacing the ancient choke. The "cold" feature set the fuel mix and the RPM and made starts easier. Now you did not say if the starting problem was when hot or cold or both.

The poor performance when slowing down can be related to the idle rpm being set too low once the thermal switch cuts out. What happens is someone tunes the engine for a rpm that may be correct for the car, but the thermal switch has not dropped the rpm yet. Then when the car really heats up, the idle drops even lower and when you take off your foot from the throttle, the throttle closes too much and the engine cuts out when you are slowing.

Put in a new thermostat. The idle settings can not be set until the thermal switches activate to a run position. Also you may have some vacuum lines crossed which are making the cold and hot cycles reverse. There should be a label with vacuum line routing shown stuck on a part that holds the radiator.

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1 Answer

Stalling


.... Robert Grove
johnallen496, when you say it stalls at low speeds and stops, do you mean when slowing down and coming to a stop? does it stall at low speeds while the car is moving with your foot on the pedal just a little like when driving through a parking lot?...

I used the wrong box above, oh well ....

The most common cause of stalling at low speeds, especially idling and decelerating to a stop is carbon buildup. The throttle plates get coated with carbon closing down the opening slightly, this affects the idle speed, causing the engine to stall at idle and coming to a stop.

also carbon builds up in the cylinders and absorbs fuel intended to be burnt, leaning out the mixture and causing rough/low idle and stalling - especially when the engine is cold. Dirty injectors can cause the same symptoms/results

As a maintenance routine It's good to have the throttle plates cleaned and perform a top engine de-carbon treatment, and fuel injection service in more severe cases

Sea Foam makes a spray that works great for minor de-carbon service, just spay it into the throttle plates while it is running, one to two cans will do, add a can of Sea Foam or Techron to the gas tank each time you fill up for the next few tank full's.

If you still have problems sek out a qualified professional

Good luck!

Robert Grove, WEGO2U Mobile Mechanics
Orange County Mobile Mechanic Orange County Mobile Mechanics 714 709 4594

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1 Answer

1995 jeep grand Cherokee limited cold start and idle issues. takes 5 to ten min every day to get it started an idling must keep foot on gas or dies We have replaced parts but continue o have the...


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2 Answers

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just do induction / throttle body cleaning - will solve high idle on start up

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1 Answer

MY 220K MILE 1997 NISSA TRUCK ONCE IT WARMS UP (WILL NOT DO IT COLD LIKE AFTER 30 MIN ON) WILL IDLE VERY LOW, THEN STALL OUT, CHANGED OUT FUEL FILTER, DISTRIBUTER, CAP & ROTOR, PLUGS, WIRES,...


A throttle positioning sensor or idle sensor can cause these problems, low fuel pressure can cause these problems also low fuel pressure can be caused by a faulty fuel pressure regulator.

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1 Answer

Engine Stalling and stumbling at highway speeds


thats it may be the fuel pump, and the reason why its worse when cold its becouse, when you start the engine cold it needs more fuel to function properly and hold a good idle until it gets its normal operating temp, during these moment the ecu increases the injectors pulse duration to get more fuel to the engine and perhaps a low fuel pressure will give bad fuel atomization and it gives you bad idle and cruise quality, I recomend you to check your fuel pressure for abnormal readings it can be easy by the injectors fuel rail, i hope it help's good luck

Jan 03, 2010 | 2001 Dodge Ram 1500 Truck 2WD

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