Still smoke issue

[Coltonreece]

I got a 1993 f250 7.3 idi NA, mileage says 148,000 but the title says 358,000, which is weird because when I bought it nothing pointed to a truck with 358,000 miles on it, no rust, runs good for the most part, clean. Any how, it smokes pretty bad, a lot when first started, and less when warm, and I really only notice it when idling. It also misfires ( what seems to be a miss) when cold. I was thinking the pump is retarded too much, but could that also cause what’s seems to be like a misfire ? I’ve also noticed something that just started happening recently, when I’m accelerating at a steady pace, at around 1700 rpm’s it’ll occasionally spike 2-300 rpm’s for like 2 seconds, then drop back down, all while I’m still accelerating. What could cause this ?

 

[Coltonreece]

I also recently tried the ATF in the fuel filter, and it didn’t seem to change much. I also wanted to add that it starts up very easily especially when warm, like in one crank, wouldn’t retarded timing cause a hard start ? Because I do not have that issue whatsoever so ever

 

[DirtyWood]

Retarded timing could make it smoke more. I've played with the timing and even when it was a bit too retarded the engine still started easily. The injection pump could be turned up too much. An injector may be hanging open. I've had an issue where an injector was hanging open and it would smoke a lot for a few seconds when cold but once warmed up it went away. I ran some additive and then tried to run the engine hard to heat things up and hopefully help clean out any deposits. Eventually the issue went away.

 

[Kizer]

Spike in RPM is usually associated with air intrusion.

At one point, I had "the perfect" air intrusion on the '93.
Hard acceleration was causing air to enter the fuel system at the FSV.
Result: It felt a little like hittin' the NOS button on a gasser.
It was kinda' cool, until the air intrusion got worse

 

[IDIBOBS]

Um I had 580,000 miles in a 2001 super duty today side and out and under the hood looked nearly brand new. So please tell me what a truck with 350k is supposed to look like.

 

[Kizer]

Um I had 580,000 miles in a 2001 super duty today side and out and under the hood looked nearly brand new. So please tell me what a truck with 350k is supposed to look like.

That was helpful!
The whole forum appreciates it, I'm sure.
Perhaps "facetime" would be a better fit for you.

 

[Coltonreece]

Um I had 580,000 miles in a 2001 super duty today side and out and under the hood looked nearly brand new. So please tell me what a truck with 350k is supposed to look like.

Thanks **** head ! id say a truck with 350,000 looks like a truck with 350,000. Good thing we aren’t talking about power strokes here

 

[Coltonreece]

Spike in RPM is usually associated with air intrusion.

At one point, I had "the perfect" air intrusion on the '93.
Hard acceleration was causing air to enter the fuel system at the FSV.
Result: It felt a little like hittin' the NOS button on a gasser.
It was kinda' cool, until the air intrusion got worse

See that’s what I was thinking too, because it is only when my transmission is about to shift gears, it’ll spike up. It’s not like other air intrusion spikes I’ve have tho, like when I’m running low on fuel. It’s different

 

[Coltonreece]

See that’s what I was thinking too, because it is only when my transmission is about to shift gears, it’ll spike up. It’s not like other air intrusion spikes I’ve have tho, like when I’m running low on fuel. It’s different

Also thought maybe FIPL

 

[Kizer]

See that’s what I was thinking too, because it is only when my transmission is about to shift gears, it’ll spike up. It’s not like other air intrusion spikes I’ve have tho, like when I’m running low on fuel. It’s different

Got it.
All of my IDIs are bolt action...I didn't even think about FIPL being out of spec.
I haven't looked, but there's probably something the "Tech Article" regarding FIPL adjustment/troubleshooting.

 

[IDIBOBS]

That was helpful!
The whole forum appreciates it, I'm sure.
Perhaps "facetime" would be a better fit for you.

You got it no problem. The point was a truck can have 20k people n it and be beat to heck and a different truck might have several hundred thousand and look brand new. It’s alll in how you take care of it. It’s a pretty bad way to try and diagnose something based on looks.

 

[IDIBOBS]

The fipl or tps throttle position has zero to do with the motor so it would. It make the motor smoke in any way. All it does it tell the trans where the throttle is. Now it may need to be adjusted but it could be 10deg out and not make the motor smoke. This is a fuel or air problem.

 

[Kizer]

The fipl or tps throttle position has zero to do with the motor so it would. It make the motor smoke in any way. All it does it tell the trans where the throttle is. Now it may need to be adjusted but it could be 10deg out and not make the motor smoke. This is a fuel or air problem.

"when I’m accelerating at a steady pace, at around 1700 rpm’s it’ll occasionally spike 2-300 rpm’s for like 2 seconds, then drop back down"

 

[IDIBRONCO]

"when I’m accelerating at a steady pace, at around 1700 rpm’s it’ll occasionally spike 2-300 rpm’s for like 2 seconds, then drop back down"

After reading this again in your quote, I wonder if the torque convertor is locking and unlocking. That's about the RPM change that happens during lock up or unlock. Although I think it should only happen in drive and overdrive. I don't think there's any lock up in first and second.

 

[BeastMaster]

The fipl or tps throttle position has zero to do with the motor so it would. It make the motor smoke in any way. All it does it tell the trans where the throttle is. Now it may need to be adjusted but it could be 10deg out and not make the motor smoke.

Yup. But a misadjusted FIPL sensor ( TPS ) will sure make the transmission controller do strange things!