1997 Mitsubishi Galant Coolnat leak/rough idle

Tiny
NORANDO29
  • MEMBER
  • 1997 MITSUBISHI GALANT
Engine Cooling problem
1997 Mitsubishi Galant 4 cyl Two Wheel Drive Automatic N/A miles

at the start of the car idles fine then begins to have a rough idle then after a few minutes idle is fine again, any clue? The other thing is it has a coolant leak I dont see any visable leak from water pump they leak seems to becomeing from the right side of the moter (beltside) is not overheating at this time it did before

question just came up im assumeing im looking at the water pump if not let me know coolant hoses are coming from it so I think thats it
please give me your feedback
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Monday, January 25th, 2010 AT 1:38 PM

19 Replies

Tiny
JACK42
  • MEMBER
First make sure all of the tune up is in good order. An issue that goes away liek that can be very difficult to find sometimes, but always start basic first. The water pump can leak intermittently, sometimes they will leak when running, when idle, engine off, at all different times.A pressure test will usually show exactly where it is leaking, but sometimes you have to take off some covers to see the source of the leak.
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Monday, January 25th, 2010 AT 1:56 PM
Tiny
NORANDO29
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I was being dumb it does look to me that the waterpump is leaking I was just looking in the wrong area the rough idle maybe the timing belt found out was never replaced when the motor was put in a couple yrs ago or due to water pump leaking could that cause rough idle?

Please answer and soon as you can
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Monday, January 25th, 2010 AT 2:27 PM
Tiny
JACK42
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Not likely, especially an intermittent issue like you described. Like I suggested, start by being sure the tune up is good, with OEM parts (Original Equipment Manufacturer)
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Monday, January 25th, 2010 AT 3:38 PM
Tiny
NORANDO29
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Ok well I replaced the spark plugs and wires recently on this vehicle wht else would be a good idea to check beiseds when replaceing the waterpump ill replace the timing belt as well if I know that the water pump is leaking is a compression test still needed?
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Monday, January 25th, 2010 AT 3:54 PM
Tiny
JACK42
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I doubt a compression test will reveal waht is making it miss intermittently. This could be a bad injector or coil. Best bet would be to have a shop have it on a scan tool to watch the injectors when it starts missing to narrow it down or eliminate them as the problem
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Tuesday, January 26th, 2010 AT 7:35 AM
Tiny
NORANDO29
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Thats what I was thinking thank you for your time
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Tuesday, January 26th, 2010 AT 11:14 AM
Tiny
NORANDO29
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So when it starts to idle rough and I hold the car at like 2500 rpm it smooths it out(not right away but I can tell its miss firing) any ideas I am gonna hook it up to a scannner today just wanna get ideas?

Please respond as soon as you can thank you
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Tuesday, January 26th, 2010 AT 11:55 AM
Tiny
JACK42
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Sounds like it could be an injector. If your scanner cant watch injector waveform, it may not be much help other than to locate which cylinder is missing
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Tuesday, January 26th, 2010 AT 12:18 PM
Tiny
NORANDO29
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Ok so I got it on a scanner I was able to graph it still kinda confused I havent dealt with many scanners for this type of thing wave form numbers wht am I loooking for in those?
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Tuesday, January 26th, 2010 AT 6:48 PM
Tiny
JACK42
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Is any one different than the others? That wil be the problem one. Were you watching while it was misfiring? Any codes in the PCM?
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Tuesday, January 26th, 2010 AT 7:28 PM
Tiny
NORANDO29
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Well this scanner has one graph for injectors so jus on signal im guessing it may not be what I am looking for? No clue
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Wednesday, January 27th, 2010 AT 1:18 AM
Tiny
JACK42
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Need to be able to see the waveform for each injector to compare them
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Wednesday, January 27th, 2010 AT 7:29 AM
Tiny
NORANDO29
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Will testing each injectors connector help at all with a meter or even a test light if so meter whise wht will be the normal spec id be looking for?
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Wednesday, January 27th, 2010 AT 12:42 PM
Tiny
JACK42
  • MEMBER
If they are acting up at a specific temp it might. Try shutting the car off when itis missing and testing resistance across the injectors to see if you have one that is different than the others
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Thursday, January 28th, 2010 AT 7:48 AM
Tiny
NORANDO29
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Ok so I replaced the sparkplug and wires and cap and rotor on this vehicle once again and to find thier was oil in at least to plug holes?

Thinking maybe the reason for rough idle was spark but it did not fix it it when it is idleing like that I hear air louder than normal no clue though?

Another note is that I checked the injectors to see if they were all clicking and they are the next thing is testing them like was said before

anything will help me here please respond as soon as you can
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Monday, February 22nd, 2010 AT 2:25 PM
Tiny
NORANDO29
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Only has rough idle the first time I start it meaning ill start it anytime in the day has the rough idle ill shut it off wait like anywhere from 5to 20min and most of the time it does not idle like it is I was just out ther checking it again and the car was idleing in park at like 2300 droped slowly as I sat in the car
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Monday, February 22nd, 2010 AT 2:37 PM
Tiny
JACK42
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Find the source of the loud air noise. Just because the injectors are clicking, it doesnt mean there isnt a bad one
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Monday, February 22nd, 2010 AT 7:53 PM
Tiny
NORANDO29
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I am replacing the water pump on the galant and it says to use a tackey sealant on the gasket if you could tell me the best stuff to use and where to get it I would like that very much
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Wednesday, March 3rd, 2010 AT 12:17 PM
Tiny
JACK42
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I use GMS (General Motors Sealant) available at GM dealers
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Wednesday, March 3rd, 2010 AT 12:36 PM

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