will not start when hot
Thread Starter
|
New User
Joined: Sep 2017
Posts: 11
Likes: 0
will not start when hot
I have a 1999 f250 manual transmission. During the summer after driving with the AC on for a time if you stop and shut off the truck and then try a restart, the starter will crank the engine over, but it will not start. If you push the truck and "pop" the clutch it will start and run fine. The engine has to barely turn over to have it run by the "push start", and I mean less than walking speed. If you cannot push or roll the truck, then it must sit for minutes, or hours before it can be started by the starter. The fuel pump and computer relay has been changed with no effect. This one has me baffled. Anyone have experience with this, or know what the problem is?
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 420
From: Long Island USA
That baffles me too 
The one thing I can think of is, moving the truck might jostle the fuel pump enough to get it running again. Next time this happens, whack the gas tank with 2x4, or just crawl underneath and kick it a few times. The fuel pump might be stalling.
The one thing I can think of is, moving the truck might jostle the fuel pump enough to get it running again. Next time this happens, whack the gas tank with 2x4, or just crawl underneath and kick it a few times. The fuel pump might be stalling.
Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
This seems to be an issue from heat soak, something is losing contact when that condition sets in. Why it will start easily when pushed or popping the clutch is baffling. I'm curious if when this happens again could a battery jumper start assist be tried?
Of course this could be 100% related to the fuel pump but since that's so far rearward of the engine it might not be affected by heat soak.
Hope this isn;t too tough to diagnose and/or fix.
Of course this could be 100% related to the fuel pump but since that's so far rearward of the engine it might not be affected by heat soak.
Hope this isn;t too tough to diagnose and/or fix.
Thread Starter
|
New User
Joined: Sep 2017
Posts: 11
Likes: 0
Update: Truck did it's usual no start "game", tried using the starter to crank, and pushing down on go pedal about an inch per Krewat suggestion in another post, VIOLA! started right up. So, if I read right, that is an indication of an IAC problem, correct?
Thread Starter
|
New User
Joined: Sep 2017
Posts: 11
Likes: 0
Ordered Motorcraft parts on Amazon, and I'm going to change it out next week and will get back to the forum. Thanks Krewat! Hopefully this will be the solution
Part numbers for this IAC replacement are: CX-1870 or YC2Z-9F715-CH for the IAC
Gasket part number is CG-763 or F7UZ-9F670-AB
For 1999 f250 V10. Most probably fits many other years of V10
Part numbers for this IAC replacement are: CX-1870 or YC2Z-9F715-CH for the IAC
Gasket part number is CG-763 or F7UZ-9F670-AB
For 1999 f250 V10. Most probably fits many other years of V10
New User
Joined: Aug 2019
Posts: 14
Likes: 0
Trending Topics
Thread Starter
|
New User
Joined: Sep 2017
Posts: 11
Likes: 0
Will know tomorrow evening. Just installed the IAC about an hour ago. Will update ASAP when I know.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Thread Starter
|
New User
Joined: Sep 2017
Posts: 11
Likes: 0
Ok, here is the scoop on the IAC replacement to hopefully solve the no start when hot problem. It appears a bad IAC was the culprit, I ran the AC today in 94 degree weather, made several stops, and truck started up each time with no problem. Before replacement of the new part, the truck was also surging, and accelerating by itself when shifted into third gear, and that problem is also gone. So replacing the valve fixed two gremlins. Bought the OEM parts from Amazon for 60 bucks, see earlier post. Much thanks go to Krewat as I read some of his earlier posts in my research, and as a result was able to determine the problem. Thanks Krewat!!!
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 420
From: Long Island USA
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 420
From: Long Island USA
Fleet Mechanic
Joined: Oct 2004
Posts: 1,394
Likes: 104
From: Southern KS
I thought you lived in Hawaii. Maybe I am wrong. Either way that was a blast from the past!
Thread
Thread Starter
Forum
Replies
Last Post
ColterDC
1999 - 2016 Super Duty
11
Jan 20, 2017 01:26 PM
dnkensinger
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
9
Aug 14, 2016 11:49 PM