stumbles while starting
Thread Starter
|
Freshman User
Joined: Apr 2004
Posts: 38
Likes: 0
From: Makawao, Hi.
stumbles while starting
Don't know if this is the right place, but I have an '89 F-150, 50L, EFI, auto. While trying to start engine in the morning or after sitting for a while, like after work, I turn the key, she cranks and then stumbles really bad for a few seconds and either starts or dies. If she doe'nt start I try again and she starts right up. I'm thinking the fuel pressure between the regulator and the fuel rail or injectors is leaking out. There is a fitting on the fuel rail that looks a valve stem on my tire. When you push the core in , is the gas supposed to shoot out, or kind of just spill out. Not real sure how that thing works. Any help out there would be great.
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
Next time you go to start it, try turning the key on, but not to start, and back off a few times before starting. If it fires right up, then a fuel pressure loss is the problem. That comes from a bad pressure regulator, a leaking injector, or a bad check valve in the fuel pump.
Senior User
Joined: Oct 2003
Posts: 480
Likes: 1
From: Elyria, Ohio
4 years ago replaced regulator and all injectors and still had problems with pressure; wound up replacing fuel pump in tank. Recently symptoms like yours and I tested fuel pressure at 35 psi but leaked down soon after turning engine off. One plug was wet and washed clean with fuel; others were a light gray color. I figured stuck open injector. A bottle of STP Injection Cleaner in a full tank of gas and a few spells of coughing and it is fixed. Pressure now holds long after turning off engine and all plugs are looking good and engine running smooth. $2.99 well spent.
Thread
Thread Starter
Forum
Replies
Last Post
1918ALF
1987 - 1996 F150 & Larger F-Series Trucks
6
May 1, 2013 08:34 PM
92will
1987 - 1996 F150 & Larger F-Series Trucks
43
Feb 18, 2012 05:40 AM
