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Long cranking time when warm

Old Mar 5, 2018
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Long cranking time when warm

My 2002 1.7L will start when it's cold very quickly every time but once it warms up the crank time goes way up. The other day I thought it was taking so long it wasn't going to start. I even called my son to pick me up. Waited a minute or so, tried starting it and it started. The only thing I tried was replacing the fuel pump relay located behind the glove box.
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Old Mar 5, 2018
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Re: Long cranking time when warm

one of the coolant temp sensors may be giving a wrong value when warm, causing the computer to provide the wrong air/fuel mixture and making the car hard to start.
If you can plug in a scanner that shows live data it will show you all the sensor readings and you can see if one is out of whack
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Old Mar 5, 2018
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Re: Long cranking time when warm

Check engine light on? Got fault codes?
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Old Mar 6, 2018
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Re: Long cranking time when warm

The check engine light is not on. Would I still get error codes if the check engine light isn't on?
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Old Mar 6, 2018
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Re: Long cranking time when warm

the bulb may be burned out, or someone may have removed it
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Old Mar 6, 2018
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Re: Long cranking time when warm

The check engine light comes on when I first turn the key, the engine starts and the light goes off.
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Old Mar 6, 2018
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Re: Long cranking time when warm

Aren't there 2 main fuel relays for our vehicles? If so, replace both. They are behind the glove box.
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Old Mar 6, 2018
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Re: Long cranking time when warm

Originally Posted by panama
The check engine light is not on. Would I still get error codes if the check engine light isn't on?
You can find if something useful is stored in memory

Originally Posted by NDNV
Aren't there 2 main fuel relays for our vehicles? If so, replace both. They are behind the glove box.
2 mains; one is for the fuel pump and other is for PCM
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Old Mar 6, 2018
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Re: Long cranking time when warm

According to the Chilton manual I got from the library there are two relays called PGM-F1 and the fuel pump relay which I already replaced. These are behind the glove box. Should I replace the PGM-F1 relays?
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Old Mar 6, 2018
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Re: Long cranking time when warm

It's PGM-FI, not F1 (letter I, not number one)

As I said earlier, one main relay is for the fuel pump and the other main relay is for the PCM. Both should have originally been blue.
You can replace it if you wish

How many relays does your car have behind the glovebox anyway?
3rd relay (black) is for reverse lights on auto trans cars




Personally, I'd want to connect a good scanner so I can watch (or record) live engine operating data when it acts up.

Last edited by ezone; Mar 6, 2018 at 07:51 PM.
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Old Mar 7, 2018
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Re: Long cranking time when warm

I am courious as too what made you think you should just up and replace the fuel pump relay.

Logically if the car will start at all and once started stays running normally even under load then it’s not a fuel supply issue.

So why did you start there?
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Old Mar 7, 2018
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Re: Long cranking time when warm

Originally Posted by panama
My 2002 1.7L will start when it's cold very quickly every time but once it warms up the crank time goes way up. The other day I thought it was taking so long it wasn't going to start. I even called my son to pick me up. Waited a minute or so, tried starting it and it started. The only thing I tried was replacing the fuel pump relay located behind the glove box.
sometimes caused by a poor ground......

start by removing and cleaning your battery terminals,

make sure they are clean and tight
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Old Mar 7, 2018
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Re: Long cranking time when warm

How many relays does your car have behind the glovebox anyway?
Answer: 3 left to right a black one following two side by side blue and to the right of it a brown one.
I am courious as too what made you think you should just up and replace the
fuel pump fuel pump
relay.
Answer: I read a post on another forum site and that was what was recommended. I guess I wasted $25.
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