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Rough idle/stall ONLY after warm start Ford Ranger
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cjc146
Novice
Jan 23, 2023, 6:57 PM
Post #1 of 16
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Rough idle/stall ONLY after warm start Ford Ranger
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2002 Ford Ranger 3.0
Automatic
185K miles
Truck runs great, but here's the problem. If i drive the truck at operating temperature for a bit and park it for 10 or 20 minutes, when I go to restart it, starts up fine but after a few moments the idle drops to 2 or 300 rpm and the engine nearly stalls out, but then quickly kicks up to 1000-1200 rpm and then settles at it's normal 7-800 rpm idle. And then all is normal. Truck cold starts great, idles great, drives as it should; its just the warm start issue i explained above and happens every time i restart a warm/hot engine. There are NO check engine light or codes on my ODB reader.
Things i've fixed/replaced on the truck:
idle air controller
MAF sensor
throttle position sensor
cleaned throttle body
cam shaft synchronizer
piston rings/honed cylinders
crank shaft bearings
replaced driver side cylinder head
new fuel pump/filter
All fluids are fresh
new plugs/wires/coil pack
catalytic converts are good and flow appropriately
solid fuel pressure, 60 PSI, and no PSI change when idle nearly stalls
transmission cooler flushed, new tranny filter/fluid
compression is: 170,165,165,160, 165, 163
no vacuum leaks that I can find w
Any thoughts or direction would be great before I take it to the dealership to see if their $200 diagnostic can figure it out.
Thank you
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 23, 2023, 7:47 PM
Post #2 of 16
(917 views)
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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Sounds like you were pretty thorough.
Did you time the synchronizer?
This has to come back to the IAC and throttle body. At that mileage the throttle shafts could be worn out which will play havoc with the idle speed.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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cjc146
Novice
Jan 23, 2023, 8:16 PM
Post #3 of 16
(912 views)
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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Evening, i had no change in replacing the IAC from old to new...just replaced to know i have a new one since the truck sat for 2 years before i came along to get her back on the road.
ill see what i could do with the throttle body/shaft. Maybe the expanded metal on hot restart is throwing off my air/fuel ratio till the computer picks it up and adjusts appropriately?
As for the synchronizer, i marked the old one in place prior to removal, transferred marks to the new one and install in exact location. Also no change from old to new, another part i replaced for peace of mind and everything was out of my way at the time.
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Hammer Time
Ultimate Carjunky
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Jan 23, 2023, 8:22 PM
Post #4 of 16
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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It's not expanded metal. It's the temp sensors changing the mixture as the engine warms.
You really need a scan tool to look at all the sensor data for something off.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Sidom
Veteran
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Jan 23, 2023, 8:49 PM
Post #5 of 16
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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At this point you really need to look at some scan data. I would like to see some cold start data And then some data when its acting up. In particular coolant temp Readings and the IAC. steps. Also inspect the Air intake tube Sometimes those can get a split in between the bellows that go unnoticed
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cjc146
Novice
Jan 24, 2023, 4:59 AM
Post #6 of 16
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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Ill check out the intake tube.
I forgot to add the coolant temp sensor was also replaced thinking it was going defective and sending wrong temp to the computer during a warm start, but no change after replacement.
What steps should i take with the IAC? I cleaned out the old one with no change in symptoms and went ahead and replaced it with a new one with no change symptoms.
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Hammer Time
Ultimate Carjunky
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Jan 24, 2023, 5:42 AM
Post #7 of 16
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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The coolant temp sensor is not the only temp sensor effecting mixture. Like you have been advised by two different people, you need to see scan tool data.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Sidom
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Jan 24, 2023, 10:58 AM
Post #8 of 16
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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At this point you really do need to look at some scan data To help pinpoint a problem It really seems like it might be some computer control thing going on.
1 thing you could do is make sure the base idle is set right. You do that by blocking off the air passage in the Throttle body that goes to the IAC And then when the engine is idling it should be at it's base setting which is usually 400RPM Just be careful whatever used to block off the air passes doesn't get sucked into the IAC.
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cjc146
Novice
Jan 24, 2023, 7:00 PM
Post #9 of 16
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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Thanks for all the insight. Gonna to start running down everyone's leads for me.
Here's a quick video of my warm engine idle drop along my cheap data scanner.
Let me know if anything jumps out at you. I'm thinking my timing may be off.
https://www.youtube.com/shorts/4Za_cbhNr4E
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Hammer Time
Ultimate Carjunky
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Jan 24, 2023, 7:39 PM
Post #10 of 16
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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The video is marked private and not viewable.
Also, your ignition timing is fixed and not adjustable.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jan 24, 2023, 7:40 PM)
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cjc146
Novice
Jan 24, 2023, 8:11 PM
Post #11 of 16
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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https://youtube.com/shorts/4Za_cbhNr4E?feature=share
Should be public now, sorry.
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Hammer Time
Ultimate Carjunky
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Jan 24, 2023, 8:15 PM
Post #12 of 16
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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The engine sounds like it's loading up on fuel. Can you bring up the adaptives (fuel trims) on the scanner while this is happening?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jan 24, 2023, 8:16 PM)
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cjc146
Novice
Jan 24, 2023, 8:49 PM
Post #13 of 16
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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I can, just not till tomorrow evening. I'll post another video after work
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cjc146
Novice
Jan 25, 2023, 6:23 PM
Post #14 of 16
(776 views)
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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https://youtu.be/g4voaCUDm78
Link to video of fuel trims during warm start idle drop
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Hammer Time
Ultimate Carjunky
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Jan 25, 2023, 6:29 PM
Post #15 of 16
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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Your fuel trims were climbing on bank 2 only. I would look for some time of air leak near that bank.
I would probably do a smoke test on the intake. It's pretty hard to find any vacuum leaks any other way on this intake.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jan 25, 2023, 6:35 PM)
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cjc146
Novice
Jan 25, 2023, 6:56 PM
Post #16 of 16
(765 views)
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Re: Rough idle/stall ONLY after warm start Ford Ranger
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Will do, thanks for the help. I'll see what I can find.
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