PLEASE HELP!!
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1st Gear
Joined: Sep 2025
Posts: 1
Likes: 1
From: Charleston, SC
PLEASE HELP!!
Hi everyone! Great to be here. I've got a strange issue that has gone on for a while now..Just to give a background on the truck: 1999 F250 SuperDuty v10 6.8L. Bought it a month ago and steadily has gotten worse. Started with just a shake or shudder at 40-45. Went ahead and changed all fluids, spark plugs, COP, MAF sensor, IAT sensor and some fuses. No CATS. So, now to the current condition.. It starts up no problem. Idles ok then starts like coughing out the exhaust. When you put in gear and hit the gas it just creeps along with more of the coughing/back fire type sound. Gets up to about 40 and shakes violently. It will go over 40 mph but takes a year and then shakes more. Also if you step on the gas it shakes no matter what speed. I've checked the codes and there's nothing related to the pcm. No misfires with live data. Im stumped! Please help!! Need to resolve this ASAP as its a work truck. TIA
Laughing Gas
Joined: Oct 2007
Posts: 941
Likes: 98
Sounds that you have a scanner , will it do live data ?
if so , what are tour shot term and long term fuel trims ?
what is the maf readings .
these are OBD1 , so they are not going to give you clear and accurate cylinder misfire, just general multiple cylinder misfire...
if so , what are tour shot term and long term fuel trims ?
what is the maf readings .
these are OBD1 , so they are not going to give you clear and accurate cylinder misfire, just general multiple cylinder misfire...
FTE Community Team
Joined: Jan 2019
Posts: 10,703
Likes: 1,494
Does it have an aftermarket program in it to delete the catalytic converter from its mind? . . . and probably give more power/economy/etc.?
Are there any other major modifications with it?
How clean is the air filter?
Are there any other major modifications with it?
How clean is the air filter?
Laughing Gas
Joined: Oct 2007
Posts: 941
Likes: 98
Sounds like a fuel issue.
can you check fuel preasure from the Schrader valve on the passenger side .
if you don't have a dedicated test tool , you can use a tire pressure gauge .
can you check fuel preasure from the Schrader valve on the passenger side .
if you don't have a dedicated test tool , you can use a tire pressure gauge .
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FTE Community Team
Joined: Dec 2023
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From: sussex county, nj
very odd since in 1996 obd 2 rules came into affect the 95 150 i had , had it
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FTE Community Team
Joined: Jan 2019
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I have a 1999 F-350 and 1999 F-53 in my yard right now that both have V-10s and both are ODB2.
@ashleyroachclip, are you talking gas or diesel?
@ashleyroachclip, are you talking gas or diesel?
FTE Community Team
Joined: Dec 2023
Posts: 8,666
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From: sussex county, nj
Laughing Gas
Joined: Oct 2007
Posts: 941
Likes: 98
I have a 1999 F-350 and 1999 F-53 in my yard right now that both have V-10s and both are ODB2.
@ashleyroachclip, are you talking gas or diesel?
@ashleyroachclip, are you talking gas or diesel?
when you look closer , you will see these until 2000 , we're called OBD 2 , BUT you will see there is very limited functions .
can not read individual cylinder misfire, fuel pressure , etc.
most scanners , when you scroll through the settings , you will see they are in fact OBD1.
FTE Community Team
Joined: Jan 2019
Posts: 10,703
Likes: 1,494
I have a 1999 F-350 and 1999 F-53 in my yard right now that both have V-10s and both are ODB2.
@ashleyroachclip, are you talking gas or diesel?
@ashleyroachclip, are you talking gas or diesel?
when you look closer , you will see these until 2000 , we're called OBD 2 , BUT you will see there is very limited functions .
can not read individual cylinder misfire, fuel pressure , etc.
most scanners , when you scroll through the settings , you will see they are in fact OBD1.
can not read individual cylinder misfire, fuel pressure , etc.
most scanners , when you scroll through the settings , you will see they are in fact OBD1.
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