Stalling in gear when warm
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2nd Gear
Joined: May 2023
Posts: 2
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Stalling in gear when warm
I have a 86 f150 5.0 efi and it idles and runs great until it gets to 160degrees then it dies when put into gear sometimes it will idle in gear but acts like it chokes when gas is pressed
Lead Driver
Joined: Jun 2013
Posts: 5,673
Likes: 1,163
From: Tolland, CT
See the link in post #11 in this thread, seems to be a few issues with this type of truck lately, It's a long video, but he shows the issue in the PCM/ecu.
https://www.ford-trucks.com/forums/1...park-loss.html
I'll assume you have checked all the normal stuff, connections and ignition system are working well.
https://www.ford-trucks.com/forums/1...park-loss.html
I'll assume you have checked all the normal stuff, connections and ignition system are working well.
Cargo Master
Joined: Sep 2006
Posts: 2,120
Likes: 390
From: Evansville, Indiana
From your other thread:
When cold, the engine management system is in open loop. The fuel and ignition are controlled using a predetermined set of parameters. As it warms it switches to closed loop and manages with feedback from the various sensors. It is quite possible that a sensor providing bad feedback could be detected by pulling engine codes.
That said, since you just dropped the engine in, did you hook up all the EEC related ground wires? Most notably the grounds landed at the rear driver's side of the intake manifold. The black wire from the EEC directly to the battery negative post is often overlooked.
These are good places to start
86 f150 5.0l brand new engine has correct fuel pressure. Why would it idle good in gear when cold. But as soon as it warms up to normal it dies almost immediately after putting in gear. Sometimes will idle for a few seconds but when I press the gas just say In drive it'll choke. I have replaced iac and tps both check out correctly
When cold, the engine management system is in open loop. The fuel and ignition are controlled using a predetermined set of parameters. As it warms it switches to closed loop and manages with feedback from the various sensors. It is quite possible that a sensor providing bad feedback could be detected by pulling engine codes.
That said, since you just dropped the engine in, did you hook up all the EEC related ground wires? Most notably the grounds landed at the rear driver's side of the intake manifold. The black wire from the EEC directly to the battery negative post is often overlooked.
These are good places to start
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