7.3 stalls when decellerating
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Junior User
Joined: Oct 2004
Posts: 86
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From: Oakboro, NC
7.3 stalls when decellerating
I have an intermittent problem with my diesel. I hope someone can point me in a direction to ID/fix the problem. I searched and skimmed a few months of posts and didn't find anything that seemed to address this.
I drive a '89 F250 7.3L E4OD 2WD with about 85,000 miles and no mods except K&N air filter.
Every few months, I have a problem with it. I'll be driving along and have to stop quickly in traffic. I let off the accelerater and quickly brake. And the engine dies. Shift to N and she fires right back up and accelarates fine. Sometimes it'll stall again at the next decelleration. And then it will be fine for months. When it has these episodes it seems if I ease out of the accelerater slowly she is OK.
It starts fine. It has acceptable power and mileage. This has happened intermittently with fuel from both local stations (Citgo and Exxon).
Any ideas? Thanks.
Dave
I drive a '89 F250 7.3L E4OD 2WD with about 85,000 miles and no mods except K&N air filter.
Every few months, I have a problem with it. I'll be driving along and have to stop quickly in traffic. I let off the accelerater and quickly brake. And the engine dies. Shift to N and she fires right back up and accelarates fine. Sometimes it'll stall again at the next decelleration. And then it will be fine for months. When it has these episodes it seems if I ease out of the accelerater slowly she is OK.
It starts fine. It has acceptable power and mileage. This has happened intermittently with fuel from both local stations (Citgo and Exxon).
Any ideas? Thanks.
Dave
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
When driving normally and you gently touch the brake pedal does the TConvertor disengage.......should see a 200+ RPM rise in tach and subsequent drop when brake released.
There is a Ford TSB about injection pumps being rusty inside, if you want it email me with subject........TSB for IP.
There is a Ford TSB about injection pumps being rusty inside, if you want it email me with subject........TSB for IP.
Thread Starter
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Junior User
Joined: Oct 2004
Posts: 86
Likes: 1
From: Oakboro, NC
[QUOTE=PLC7.3]When driving normally and you gently touch the brake pedal does the TConvertor disengage.......should see a 200+ RPM rise in tach and subsequent drop when brake released.
When driving normally, if I take my foot off the accelerator pedal, the TC disengages and engine drops to an idle with or without brake. If I keep constant position on accelerator and brake with left foot, TC disengages and engine stays at same RPM (1700) as truck slows (I don't do this often or prolonged or hard - I only tried it to see what would happen after you asked.) In either case, there is no rise in RPM. Occasionally, I'll be cruising along in OD and come to a steep hill, and the RPM briefly jumps from ~1750 to ~2000 and right back to ~1750 in a couple seconds.
Thanks,
Dave
When driving normally, if I take my foot off the accelerator pedal, the TC disengages and engine drops to an idle with or without brake. If I keep constant position on accelerator and brake with left foot, TC disengages and engine stays at same RPM (1700) as truck slows (I don't do this often or prolonged or hard - I only tried it to see what would happen after you asked.) In either case, there is no rise in RPM. Occasionally, I'll be cruising along in OD and come to a steep hill, and the RPM briefly jumps from ~1750 to ~2000 and right back to ~1750 in a couple seconds.
Thanks,
Dave
Thread Starter
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Junior User
Joined: Oct 2004
Posts: 86
Likes: 1
From: Oakboro, NC
Thanks for the ideas. I'll change the fuel filter, run some injector cleaner through it and start using a fuel conditioner. If the problem pops up again I'll have someone look at the injector pump per the TSB.
Dave
Dave
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