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351 bogs under load/acceleration

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Old 07-28-2017, 10:02 AM
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Unhappy 351 bogs under load/acceleration

Alright, looking for some direction! 1995 Bronco, 5.8L. I haven't driven the truck much in the past year, and a new issue has risen. This started towards the end of it being a daily driver, so my first thought isn't old gas.

The truck will idle fine and will even rev when in park. Once I take it out to drive it's a different story. I can put it in gear and idle around all day, but once I give it some gas to accelerate it bogs down and wants to stall.

I ran codes, got an EGR code and went ahead and replaced the valve (and the subsequently broken tube connecting to the manifold which was fun!). I also replaced the coil.

I figured this was a fuel supply issue, but just tested pressure at the rail and am seeing constant 29psi at idle and 39psi when I remove the vacuum line from the fuel pressure regulator. Also jumps to 39psi when I hit the throttle, but backs down to 30 if I hold the RPMs up.

Next thought is TPS or IAC, but wanted to check for any advice before throwing more parts at it. Not getting any additional codes either...

Thanks!
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Old 07-28-2017, 10:33 AM
Redark1 Redark1 is offline
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when was the last time the fuel filter was replaced. the pressures you listed are good but don't indicate volume available.

could be dirty injectors or gummed up from lack of use. might add some stabilize and let it run for a half hour in the driveway.
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Old 07-28-2017, 10:37 AM
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I did replace the fuel filter the other week when I started messing with it again. I'm fearful that part of the issue might be a gummed up pump, but of course I'm hoping its something else as to not have to drop the tank! Any way to test the volume? I'll pick up and run some stabilizer in it. Thanks!
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Old 07-28-2017, 12:51 PM
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Are you getting any codes now are those repairs?
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Old 07-30-2017, 12:10 PM
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Quote:
Originally Posted by Conanski View Post
Are you getting any codes now are those repairs?
I haven't had a chance to test again, but will try to soon.

What's frustrating also is that I can't get any consistency on the problem. I mas moving cars around yesterday and I drove it around the block with zero issues, and then a few hours later did the same and the problem had returned. Both trips were in the afternoon with 100+ temps so there wasn't any big variations in conditions between the drives.
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Old 08-02-2017, 03:08 PM
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you may have a bad tfi module or issue with the distributor pip sensor.

timing at 10*btdc with spout removed?
checked for any vacuum leaks?

sounds like the timing may not be advancing when under a load which points to the dizzy
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