weird issue
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Freshman User
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weird issue
I have a weird issue maybe someone can help with.
95 f350 4x4 5.8 auto trans. It seems to have a lack of power or maybe a miss in lower rpm's and low gears.
(I think there is a slight miss with very little throttle then clears up with a little more throttle but, seems to run ok).
Then speeding up to get on the highway all the sudden it will set you back in the seat at higher rpm's in higher gears. You can feel the power! Not sure if it's normal or not? Transmission shifts and seems to pull fine in all gears. Any thoughts?
95 f350 4x4 5.8 auto trans. It seems to have a lack of power or maybe a miss in lower rpm's and low gears.
(I think there is a slight miss with very little throttle then clears up with a little more throttle but, seems to run ok).
Then speeding up to get on the highway all the sudden it will set you back in the seat at higher rpm's in higher gears. You can feel the power! Not sure if it's normal or not? Transmission shifts and seems to pull fine in all gears. Any thoughts?
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
Check for stored codes. If not familiar with pulling codes, visit www.fordfuelinjection.com
There are links to a wealth of information, including using a paper clip to pull codes for free. I bought the Equus code reader. It displays the stored codes, present problems, and numerous other tests.
There are links to a wealth of information, including using a paper clip to pull codes for free. I bought the Equus code reader. It displays the stored codes, present problems, and numerous other tests.
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Freshman User
Joined: Jul 2012
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Check for stored codes. If not familiar with pulling codes, visit Fuel Injection Technical Library
There are links to a wealth of information, including using a paper clip to pull codes for free. I bought the Equus code reader. It displays the stored codes, present problems, and numerous other tests.
There are links to a wealth of information, including using a paper clip to pull codes for free. I bought the Equus code reader. It displays the stored codes, present problems, and numerous other tests.
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
Well, that's enough to bum ya out... Good there isn't codes stored. Next item to test would be fuel pressure. When was the last time the fuel filter changed? Dual tanks? Does it it occur on both tanks or not if equipped with dual tanks?
Just a few more suggestions... Hope this can help ya.
Just a few more suggestions... Hope this can help ya.
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Freshman User
Joined: Jul 2012
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Well, that's enough to bum ya out... Good there isn't codes stored. Next item to test would be fuel pressure. When was the last time the fuel filter changed? Dual tanks? Does it it occur on both tanks or not if equipped with dual tanks?
Just a few more suggestions... Hope this can help ya.
Just a few more suggestions... Hope this can help ya.
Been this way as long as I have had it. Not sure there is a problem, but seems to have much more power at higher gears and rpm. If you are getting on the highway and all the sudden, almost acts like a 4 barrel carb opens up all 4 and you get that power you can feel.
Thanks for you help timbersteel!
Senior User
Joined: Nov 2011
Posts: 456
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From: Owensboro, KY
Are you sure it's a 351? Almost sounds like how a 302 would act. They'll throw you back and fly at higher RPM's when they hit their power band, but kind of sliggish off the line. A 351 makes good low end torque where the 302 does not. Take a closer look, both engines are Windsors and look the same. Take some measurements. A 5.8 intake technically shouldn't work on a 5.0, but I'm sure it's possible. Could be that somebody dropped in a 302 and tried to reuse 351 parts.
EDIT: Before someone says a 351 intake won't physically fit a 302, I meant upper intakes. Could be a 5.0 lower and 5.8 upper. The ports aren't the same shape but it'll bolt on and look normal on the outside.
EDIT: Before someone says a 351 intake won't physically fit a 302, I meant upper intakes. Could be a 5.0 lower and 5.8 upper. The ports aren't the same shape but it'll bolt on and look normal on the outside.
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Freshman User
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Are you sure it's a 351? Almost sounds like how a 302 would act. They'll throw you back and fly at higher RPM's when they hit their power band, but kind of sliggish off the line. A 351 makes good low end torque where the 302 does not. Take a closer look, both engines are Windsors and look the same. Take some measurements. A 5.8 intake technically shouldn't work on a 5.0, but I'm sure it's possible. Could be that somebody dropped in a 302 and tried to reuse 351 parts.
EDIT: Before someone says a 351 intake won't physically fit a 302, I meant upper intakes. Could be a 5.0 lower and 5.8 upper. The ports aren't the same shape but it'll bolt on and look normal on the outside.
EDIT: Before someone says a 351 intake won't physically fit a 302, I meant upper intakes. Could be a 5.0 lower and 5.8 upper. The ports aren't the same shape but it'll bolt on and look normal on the outside.
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Posting Guru
Joined: Sep 2008
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From: Baltimore
When mine puts me back in the seat, I know it's time to upshift. (@2K) Going up mountains, I might have to drop back to 3rd, and when I tow my StarCraft popup, I rarely go into 5th. Other than that, I occasionally pull tractor trailers out of situations where they block the scales or fuel pumps when they break down...
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When mine puts me back in the seat, I know it's time to upshift. (@2K) Going up mountains, I might have to drop back to 3rd, and when I tow my StarCraft popup, I rarely go into 5th. Other than that, I occasionally pull tractor trailers out of situations where they block the scales or fuel pumps when they break down...
Senior User
Joined: Nov 2011
Posts: 456
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From: Owensboro, KY
Could be normal, I personally love the high revving 302, so I don't have enough experience with 351's to say one way or the other. Another thing to possibly look at is gearing, might be geared a little too high.
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Freshman User
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Don't know about the gearing, stock automatic transmission and rear end tho......
Lead Driver
Joined: Feb 2003
Posts: 8,140
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From: Oak Harbor, OH
It sounds like you may need to double check your timing. Does it idle rough? Are the emissions components in place and functioning normally? Is the EGR valve hooked up? The emissions systems are quite complex on these truck and can cause vacuum leaks if not hooked up or hooked up improperly, and that WOULD cause the issues you are having.
Postmaster
Joined: Nov 2011
Posts: 3,533
Likes: 17
From: SW Florida
What he said. Mine did that since I bought it, but I have a 351. Got tired of it, went and picked up a brand new timing light and found my base timing way retarded. Not surprising, considering some of the other things I've found that the PO had "fixed" or "adjusted". Set it back to 10° and all was well. Advanced it a bit more til she started pinging under load, backed off a bit... perfect. Before, it wouldn't do much if I punched it from a stop, now she'll light up the 31x10.50's... not that I do it often but I did have to test out my newly reclaimed power.
Also, does your truck have a MAF sensor? Might be time to clean it.
Also, does your truck have a MAF sensor? Might be time to clean it.
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