p0172 on a 2002 F150 5.4
08-29-2015, 08:54 PM
#31
p0172 on a 2002 F150 5.4
My LTFT bounces between -1 and -5%, so I'd say you're running a bit too rich, as jp suggested.
Crazy question, but how long since you changed the oil, and are you running 5w20?
This'll sound weird, but when I ran 10w30 in mine, my oil has a slight fuel smell to it, and my trims were way richer than they are right now, around -10 on both banks.
Also, your thermostat isn't stuck open, is it? Or do you know if you're running a 195 degree stat as oem recommends?
Crazy question, but how long since you changed the oil, and are you running 5w20?
This'll sound weird, but when I ran 10w30 in mine, my oil has a slight fuel smell to it, and my trims were way richer than they are right now, around -10 on both banks.
Also, your thermostat isn't stuck open, is it? Or do you know if you're running a 195 degree stat as oem recommends?
08-31-2015, 04:16 AM
#32
Senior Member
My LTFT bounces between -1 and -5%, so I'd say you're running a bit too rich, as jp suggested.
Crazy question, but how long since you changed the oil, and are you running 5w20?
This'll sound weird, but when I ran 10w30 in mine, my oil has a slight fuel smell to it, and my trims were way richer than they are right now, around -10 on both banks.
Also, your thermostat isn't stuck open, is it? Or do you know if you're running a 195 degree stat as oem recommends?
Crazy question, but how long since you changed the oil, and are you running 5w20?
This'll sound weird, but when I ran 10w30 in mine, my oil has a slight fuel smell to it, and my trims were way richer than they are right now, around -10 on both banks.
Also, your thermostat isn't stuck open, is it? Or do you know if you're running a 195 degree stat as oem recommends?
08-31-2015, 08:48 PM
#33
Cleaned throttle body. First thing I noticed was that truck is much more responsive now when I give it some gas. Lot of buildup around the valve, but it came off with some throttle body cleaner and elbow grease.
Long term trims are running about -7% now.
Thermostat was last winter when I did the heater core, but not sure what the rating is.
Have always run motorcraft 5w20 in this truck, and it's probably been about six months since I last changed it. Put in a new air filter then as well.
Runs nice and smooth, no misses or hesitation. Had it on the hi-way and stop and go over the last two days. All emission systems are online except the Evap. Might still be running a little rich, but at least the code has not come back. LT trims when I started this were going into the low 20's and triggering the code... so mid to upper single digits is an improvement.
Long term trims are running about -7% now.
Thermostat was last winter when I did the heater core, but not sure what the rating is.
Have always run motorcraft 5w20 in this truck, and it's probably been about six months since I last changed it. Put in a new air filter then as well.
Runs nice and smooth, no misses or hesitation. Had it on the hi-way and stop and go over the last two days. All emission systems are online except the Evap. Might still be running a little rich, but at least the code has not come back. LT trims when I started this were going into the low 20's and triggering the code... so mid to upper single digits is an improvement.
08-31-2015, 10:40 PM
#34
p0172 on a 2002 F150 5.4
Originally Posted by Jbrew
10w 30 Rusty ? Really ? So how loud is your engine clanging now? The lash adjusters won't take much of that type of abuse. The damage is usually beyond repair, - other than replacing them all. Also Noisy starts ? Yea, that's an adverse affect as well. What's weird, - why would anyone do that to their engine ?
This engine was just rebuilt. The builder said do not go any lower than 10w30, even on this motor. He's been in business since 1964, and builds several of these motors a year.
But the more I've read, the more convinced I became that I needed to run the 5w20 in it. So I changed. So far no issues at all.
09-01-2015, 09:49 PM
#35
Senior Member
iTrader: (1)
Cleaned throttle body. First thing I noticed was that truck is much more responsive now when I give it some gas. Lot of buildup around the valve, but it came off with some throttle body cleaner and elbow grease.
Long term trims are running about -7% now.
Thermostat was last winter when I did the heater core, but not sure what the rating is.
Have always run motorcraft 5w20 in this truck, and it's probably been about six months since I last changed it. Put in a new air filter then as well.
Runs nice and smooth, no misses or hesitation. Had it on the hi-way and stop and go over the last two days. All emission systems are online except the Evap. Might still be running a little rich, but at least the code has not come back. LT trims when I started this were going into the low 20's and triggering the code... so mid to upper single digits is an improvement.
Long term trims are running about -7% now.
Thermostat was last winter when I did the heater core, but not sure what the rating is.
Have always run motorcraft 5w20 in this truck, and it's probably been about six months since I last changed it. Put in a new air filter then as well.
Runs nice and smooth, no misses or hesitation. Had it on the hi-way and stop and go over the last two days. All emission systems are online except the Evap. Might still be running a little rich, but at least the code has not come back. LT trims when I started this were going into the low 20's and triggering the code... so mid to upper single digits is an improvement.
09-01-2015, 10:05 PM
#36
Senior Member
Yep, 10w30. Mc semi synth.
This engine was just rebuilt. The builder said do not go any lower than 10w30, even on this motor. He's been in business since 1964, and builds several of these motors a year.
But the more I've read, the more convinced I became that I needed to run the 5w20 in it. So I changed. So far no issues at all.
This engine was just rebuilt. The builder said do not go any lower than 10w30, even on this motor. He's been in business since 1964, and builds several of these motors a year.
But the more I've read, the more convinced I became that I needed to run the 5w20 in it. So I changed. So far no issues at all.
09-01-2015, 11:03 PM
#37
p0172 on a 2002 F150 5.4
Originally Posted by Jbrew
Yea, he doesn't know his ratios for modular tolerances. That's too bad. You have to be selective with builders whose experience is with push rod engines...these are not. In turn, A good modular build would be short lived. I'd say by more than half of the norm. Sometimes a lot less. There's quite a few engine builder quotes with these engines, - but I won't bore you with them. Instead, look up the Babcox articles, engine builders magazine. That's if you have a desire to learn about Ford Modular Engines.
Why, specifically?
The internal tolerances of the "modular" motor are no different or closer than any other modern engine. Out of all of the things I am still learning about this truck, and as a toolmaker that works for the biggest oem vehicle manufacturer in the world, tolerances are something I have a very good understanding of. Piston bore to diameter, main clearance, rod dimensions, etc., are all standard industry-accepted values for the tritons, in line with pretty much every modern thermo-dynamic combustion engine in the world.
And as I stated in my post, the rebuilder I picked has done many triton rebuilds, they are experienced with them.
The DOT here uses 10w40 in all their older f150s with tritons in them, because it lines up with their bulk oil purchase. And they've been using it in hundreds of these trucks since they were purchased brand new, without issue.
I've heard this oil argument, mainly on this board though.
While I do agree that using the oem spec oil is always the best, I would also be remiss if I didn't recognize there are many, many people using different oil viscosities.
Most people don't realize that ford specs 5w30 for this same motor overseas, in countries without CAFE standards. There's also a TSB that specs 10w40 for these motors in certain circumstances.
Not trying to stir the pot here, but I don't believe running 10w30 in my fresh rebuild for a couple of oil changes has destroyed my engine.