Hard to start in the Morning

MIGUEL NUñEZ

MEMBER
1992 MITSUBISHI DIAMANTE
3.0L
6 CYL
2WD
AUTOMATIC
160,000 MILES

Hello, every day after I check all fluids of my car I turn the key to start the car and it takes about to twenty to thirty tries to start, and when it starts the car is all shaky. I have pint pointed the issue to the engine coils, one of then is not working which makes two of my cylinders not to work, but then the car warms up they are all working correctly, and the car runs very smooth.

what can this issue be related?

I have already changed that coil thinking that that was the issue, but the issue remains. Cleaned the injectors and replaced the spark plugs, also changed the fuel pump and the issue remains.

Am I missing something?

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,861 POSTS

Yes, this sounds like a classic engine coolant temperature that is not working right. I would test the resistance compared to a new sensor cold and see what the difference is.

Here is a guide on how to use a voltmeter:

https://www.2carpros.com/articles/how-to-use-a-voltmeter

This guide will give you an idea of what you are in for when changing it.

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Here is what it will be like on your car:

Please let us know what happens.

Cheers, Ken

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Tuesday, October 17th, 2017 AT 10:43 AM

MIGUEL NUñEZ

MEMBER
3 POSTS

Dear Ken!

Thank you for taking the time to answer my question. I will be performing the test this weekend and come back with an update.

Thank you very much.

PS: I will also be posing other issues and I would like your help! I bought this car it is in very bad shape. Me and my father in law are working on it as a "project".

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Wednesday, October 18th, 2017 AT 10:19 AM

KEN L

MASTER CERTIFIED MECHANIC
42,861 POSTS

Great that is what we are here for! :)

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Wednesday, October 18th, 2017 AT 11:37 AM

MIGUEL NUñEZ

MEMBER
3 POSTS

Hello Ken!

Test has been made and I can confirm that there's one bad sensor, I have 3 sensors there.

1*- Engine Coolant Temp Sensor (computer) is working fine.
2*- Engine Coolant Temp Sensor (A/C) Bad, Not working.
3*- Engine Coolant Temp Sensor (Gauge) is working fine.

Now my question is why this sensor that has nothing to do with my engine coils is not letting 1 of my coils to start up at cold?

PS: I can't find this sensor anywhere in my city (Valencia, Venezuela) can this sensor be replaced with one from another mitsubishi? If so can you please give me an example.

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Monday, October 23rd, 2017 AT 6:38 AM

KEN L

MASTER CERTIFIED MECHANIC
42,861 POSTS

It can be taking from another car of the same make and around the same year should be fine. Usually if they plug in it will work. The plugs are shaped differently for different sensors.

Please let us know what happens.

Cheers, Ken