Fuel issues
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5th Wheeling
Joined: Dec 2018
Posts: 45
Likes: 1
Fuel issues
Got a 95 f150 with the w351 just replaced the fuel filter cause it was clogged hoping it would stop the shaking/shuddering it does still nothing, now I've noticed sense I did the fuel filter the truck is running rich I'm thinking it could be my cat what is the best way to check it do I just disconnect the wire harness from the O2 sensor or just pull the O2 sensor completely off the pipe then drive it to see how it does or does anybody have any other ideas why I could be running rich or why the truck shakes when I drive I think it could also be my tranny but I've changed the ignition control module the ignition coil the spark plugs and wires with the rotar and cap
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
Got a 95 f150 with the w351 just replaced the fuel filter cause it was clogged hoping it would stop the shaking/shuddering it does still nothing, now I've noticed sense I did the fuel filter the truck is running rich I'm thinking it could be my cat what is the best way to check it do I just disconnect the wire harness from the O2 sensor or just pull the O2 sensor completely off the pipe then drive it to see how it does or does anybody have any other ideas why I could be running rich or why the truck shakes when I drive I think it could also be my tranny but I've changed the ignition control module the ignition coil the spark plugs and wires with the rotar and cap
Fleet Owner
Joined: Oct 2005
Posts: 20,783
Likes: 1,751
From: Kentucky
Looks like you did not like the answers you got in this thread: https://www.ford-trucks.com/forums/1...esitation.html
Second time someone has told you to check for codes. I would also highly suggest you check the fuel pressure.
Second time someone has told you to check for codes. I would also highly suggest you check the fuel pressure.
Postmaster
Joined: Nov 2011
Posts: 3,533
Likes: 17
From: SW Florida
Your cat has NOTHING to do with fuel mixture control. How do you know it's running rich? Smell? Plug condition? Codes?
How do you know you're getting too much fuel pressure? Air/fuel ratio is controlled by injector pulse width, fuel pressure should remain relatively constant except under high loads when it should INCREASE due to the FPR closing down the return.
Sounds like you need to slow down and do some research, as well as consider the advice given here, before jumping all over the truck replacing parts and jumping all over this forum starting threads.
How do you know you're getting too much fuel pressure? Air/fuel ratio is controlled by injector pulse width, fuel pressure should remain relatively constant except under high loads when it should INCREASE due to the FPR closing down the return.
Sounds like you need to slow down and do some research, as well as consider the advice given here, before jumping all over the truck replacing parts and jumping all over this forum starting threads.
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5th Wheeling
Joined: Dec 2018
Posts: 45
Likes: 1
Noticed the fuel pressure was high when I changed the fuel filter and it started burning through gas like crazy and yes I smell gas out of the tail pipe really strong and check engine light is not coming on throwing codes yes it works cause it use to come on before it's just a pain having to get a obd1 scanner
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Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
Noticed the fuel pressure was high when I changed the fuel filter and it started burning through gas like crazy and yes I smell gas out of the tail pipe really strong and check engine light is not coming on throwing codes yes it works cause it use to come on before it's just a pain having to get a obd1 scanner
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Mountain Pass
Joined: Sep 2009
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just a pain having to get a obd1 scanner
$25 or so for an OBDI scanner will probably save you more than that in unnecessary parts, not to mention the aggravation in chasing gremlins based on guesswork.The OBD stands for On board diagnostics. It will point you in the right direction, you still have to solve the problem.
Fuel pressure gauge, about $20, is almost as necessary.
It will be the best $50 you ever spent if you plan on keeping and driving this truck
Also, just because the check engine light isn't coming on, doesn't mean there aren't any codes stored.
Last edited by cooksmtn; Mar 7, 2019 at 11:11 AM. Reason: add info
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
If you disconnected the 02 sensor or pulled it, put it back. Then here is how to read codes without a reader. https://www.youtube.com/watch?v=p04N...ature=youtu.be
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