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02-24-2015, 04:50 PM
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Woosah
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Join Date: Mar 2014
Posts: 1,105
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02 4.0 hard to start when warm
Hey everyone My Grandpas 02 ranger has been hard to start when warm for a while now. I have to pump the gas to make it start when warm like you would when you coldstart a carbd vehicle. It runs fine after it starts. There is no CEL on.
Any suggestions of what it could be?
I'll post a video of what its doing if what i said doesn't make sense.
Truck is a 02 xlt, 4.0 auto 2wd
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1997 Ranger xlt standard cab stepside. 2.3 5 speed
06 mirrors, white face gauges, explorer limited leather seats, shorty console, UWS Toolbox, proper hitch, proper spray in bed liner.
Build Thread
1981 Honda CB900c fully dressed
2004 Jeep Wrangler 2.4 5speed
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02-24-2015, 05:30 PM
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ford dealer parts guy
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Join Date: Apr 2011
Posts: 20,938
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Re: 02 4.0 hard to start when warm
does it still do it if you cycle the key a few times prior to cranking?
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2021 F150 5.0 Screw
Past:18 F150 2.7, 16 F150 5.0, 14 F150 5.0, 07 F150 5.4, 03 Ranger 4.0
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02-24-2015, 06:48 PM
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Woosah
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Join Date: Mar 2014
Posts: 1,105
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Re: 02 4.0 hard to start when warm
I don't know I didn't try that.
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Would that see if there was something wrong with the fuel pump?
__________________
1997 Ranger xlt standard cab stepside. 2.3 5 speed
06 mirrors, white face gauges, explorer limited leather seats, shorty console, UWS Toolbox, proper hitch, proper spray in bed liner.
Build Thread
1981 Honda CB900c fully dressed
2004 Jeep Wrangler 2.4 5speed
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02-24-2015, 06:49 PM
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ford dealer parts guy
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Join Date: Apr 2011
Posts: 20,938
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Re: 02 4.0 hard to start when warm
yea that would either A. rule out fuel pump or B. make the fuel pump a smoking gun
__________________
2021 F150 5.0 Screw
Past:18 F150 2.7, 16 F150 5.0, 14 F150 5.0, 07 F150 5.4, 03 Ranger 4.0
Master Certified Ford Parts / Warranty Admin
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02-24-2015, 06:59 PM
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Woosah
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Join Date: Mar 2014
Posts: 1,105
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Re: 02 4.0 hard to start when warm
I will have to try that when I go over there next and will post back the results.
__________________
1997 Ranger xlt standard cab stepside. 2.3 5 speed
06 mirrors, white face gauges, explorer limited leather seats, shorty console, UWS Toolbox, proper hitch, proper spray in bed liner.
Build Thread
1981 Honda CB900c fully dressed
2004 Jeep Wrangler 2.4 5speed
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03-05-2015, 01:42 PM
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Woosah
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Join Date: Mar 2014
Posts: 1,105
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Re: 02 4.0 hard to start when warm
Update, still does the same thing it does in the video even when you cycle the key on and off a few times before cranking.
__________________
1997 Ranger xlt standard cab stepside. 2.3 5 speed
06 mirrors, white face gauges, explorer limited leather seats, shorty console, UWS Toolbox, proper hitch, proper spray in bed liner.
Build Thread
1981 Honda CB900c fully dressed
2004 Jeep Wrangler 2.4 5speed
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03-09-2015, 07:29 PM
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Ford Truck Driver
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Join Date: Oct 2009
Posts: 88
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Re: 02 4.0 hard to start when warm
My 05 xlt does the exact same thing. I'm pretty sure it is the fuel pump as I can hear it whining. I have just got a new pump filter and I am just waiting to get a day off and some decent weather to get it swapped. I don't know about his but mine is worse once I get below half a tank of gas. If it really struggles to start it seem to be down on power and have horrible throttle response. I also will be replacing the plugs, wires and coil to eliminate any ignition issues and I figure an ignition tune up cannt hurt.
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2005 Ranger XLT FX4
K&N Cold air Intake
Gibson Exhaust
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03-10-2015, 01:00 AM
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Ford Ranger Driver
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Join Date: Mar 2010
Posts: 4,897
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Re: 02 4.0 hard to start when warm
Back to the OP's issue, what happens if instead of pumping you hold the pedal to the floor when cranking the warm engine?
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2004 Ranger FX4 Level II, 5R55E, Sonic Blue Pearl
Proudly JAP/RICE free since March 2000
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03-10-2015, 09:04 AM
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Woosah
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Join Date: Mar 2014
Posts: 1,105
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Re: 02 4.0 hard to start when warm
Quote:
Originally Posted by cowboybilly9mile
Back to the OP's issue, what happens if instead of pumping you hold the pedal to the floor when cranking the warm engine?
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Still does the same thing, I tried that when I started it the next time after
__________________
1997 Ranger xlt standard cab stepside. 2.3 5 speed
06 mirrors, white face gauges, explorer limited leather seats, shorty console, UWS Toolbox, proper hitch, proper spray in bed liner.
Build Thread
1981 Honda CB900c fully dressed
2004 Jeep Wrangler 2.4 5speed
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03-21-2022, 03:34 PM
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Learning to use the forums
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Join Date: Mar 2022
Posts: 1
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Re: 02 4.0 hard to start when warm
My 00 Ranger 3.0 had the same exact issue where it would not start when warm, unless depressed gas pedal. It also had an eratic idle once it started.
Posting the fix that worked for me here.
As with previous posts there were no codes and everything with pump checked out etc, cleaned MAF and changed throttle position sensor. This fixed the erratic idle but still did not solve the warm starting. Since it seems to be triggered by temperature, I changed the "Coolant Temperature sensor" (19 bucks from NAPA) and that solved the issue.
All good now, starts right up.
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