Hard starting when cold

TOMTURKEY

MEMBER
1998 FORD EXPLORER
4.0L
6 CYL
4WD
AUTOMATIC
200,000 MILES

When the engine is cold I have to pump the gas to get started and then keep the RPM's up until it gets warmed up, so that it wont die after that it is fine.

Thursday, April 28th, 2016 AT 1:27 PM

3 Replies

JDL

MECHANIC
16,098 POSTS

How long since a tune-up?
Are there any applicable trouble codes?
Use a gauge and check proper fuel pressure, key on engine off. Hopefully there is a Schrader valve for the fuel pressure gauge.
Check and clean throttle-body and idle air system. Generally, you don't touch the gas pedal to start it. Check the MAF (mas air flow) sensor.

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Thursday, April 28th, 2016 AT 1:45 PM

TOMTURKEY

MEMBER
3 POSTS

Thanks for the info appreciate it

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Friday, April 29th, 2016 AT 5:05 PM

KEN L

MASTER CERTIFIED MECHANIC
42,795 POSTS

If I can suggest, I would check for vacuum leaks and remove the IAC motor to check it for gunk, it could be dirty which would cause this problem, here are some guides to help you.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/throttle-actuator-service

Please let me know what you find

Best, Ken

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Saturday, April 30th, 2016 AT 6:10 AM