This is driving me nuts. My '89 F250 has a stalling problem. Stalls all the time, will start right back up. Stalls at stops...Red lights, stop signs, etc. Happens when in putting into drive, reverse, park, whatever. Does not stall while actually moving. Has been happening worse since cold out. Doesn't matter whether engine hot or cold.

Any help, suggestions, etc would be appreciated.

 

Anyone able to help???

 

It is probably the Idle Air Control Valve. Clean it out and also try checking the ignition timing.

 

What engine & trans is in your truck ? How many miles on the truck ? Whats the maintenance history ? Etc etc .

 

Here is more information that may be helpful.

'89 F250
Auto
5.8 351
135k miles on her
Can't tell you much on service/maintenance, other than regulars such as oil, etc. No major service has been needed.

 

 

1988 F-350 5.8L EFI and I'm having the same problems. The only code being received on my Innova 3145 code reader is Code 33 associated with the EGR not opening.

My 5.8L stalls quite often too. Has been getting worse over the last 1500 miles. Engine runs great going down the road and idles fine at initial start-up - until I engage the auto tranny into gear, then it is prone to stall. Always starts again easily. Primary symptom is stalling when coming to a stop, and then it is no problem to restart and take off again.

I deal with the issue by keeping a little throttle on the foot-feed when coming to stops & when engaging transmission.

I've been reading all the historical posts on stalling which seem similar to mine. I'll try cleaning out the IAC. Any other ideas?

 

This is going to sound weird but when mine was doing that I replaced the o2 sensor and it cleared it right up.

 

Thanks for sharing that. I replaced the O2 sensor not too long ago. Not because of this problem. Just replaced them at around 100,000 miles as a routine maintenance measure. Also, my Code reader didn't pick up any O2 sensor trouble code. Only trouble code was related to EGR valve not opening. A Code 33.

I'm working on fuel pressure testing and receiving some unacceptable fuel pressures. Gonna run another test tonight off the second fuel tank system and see it there is any difference from one tank system to the other. My truck has two low pressure fuel pumps - one in each tank - and one high pressure fuel pump. So I'll mostly only be comparing any performance differences between the two low pressure pumps tonight by testing fuel rail pressure off the other fuel tank.

Here's a link to a thread I started to obtain assistance with interpretation of my fuel pressure testing data:

https://www.ford-trucks.com/forums/9...endations.html

 

When is the last time it had a full tune up?

Maybe running rather weak and the slightest change, slight drop in rpms from dropping it into gear, change in engine vac caused when hitting the brakes, etc etc is just enough additional strain to stall it. Cooler weather just increases the condition?

 

My truck runs good other than for these stalls when stopping, and at times after starting when engaging the auto tranny from Park into R or D. It dies very abruptly without prolonged chugging or struggling. Fires right back up again lickety split, no problems, and then to keep it going I maintain a little extra throttle with the foot-feed when dropping it into gear. Engine has good power and runs quite smoothly under any applied throttle. It will also run at an idle forever after start-up, and idle smoothly. Then if I engage the auto transmission into any gear - kaput. Stalled before any chance to respond with additional throttle.

As mentioned, the stall used to be less frequent and over the past 1500 miles it's now happening more often than not at stoplights, stopsigns, etc. And when engaging the transmission. Just about a given now so I'll maintain a little throttle to avoid those stalls.

A weaker fuel pump flow at idle? Dunno. I am suspicious of my fuel pressure readings based on the pressure testing results of others who have posted on the Forum. So I'm hoping to get some more help interpreting my fuel pressure test data before I start spending money replacing pumps and FPR.

As to tune ups; I probably changed out plugs 20,000 miles ago. I've never changed out the ignition wire set. I checked timing not too long ago and it was good. I'll pop the distributor cap tonight and see if the terminals look overly corroded. I've never replace the dist. cap, to my recollection.

Gonna test fuel pressure off the second tank system tonight and then post results to my Thread:
https://www.ford-trucks.com/forums/9...endations.html