Slight knock
Thread Starter
|
Cargo Master
Joined: Dec 2007
Posts: 2,039
Likes: 310
Slight knock
On the wife's Excursion with 255k on the clock, it has a random knock that comes and goes every once in a while. It only occurs with the truck in drive and not moving...like sitting at a stop light. I can move the gear shift selector to neutral and it will go away...when I give it some go pedal to start moving it also goes away. This probably happens every couple of hundred miles...not consistently all the time...but when it does happen it will do it at a couple stop lights. It's hard to tell exactly where it's coming from, but I'm guessing around the firewall area. My first thought was the possibility of the flex plate starting to crack, but to me it would get worse...I've been through that with my F350 years ago. So now I'm thinking it might be injector #8 as they are original and I'm sure need to at least have the armatures shimmed. I've also thought about a loose rocker arm but I'd think that would be more consistent. There's no loss of power or any smoke, and it seems to run fine. It really doesn't sound like a fuel knock, but could be the beginning of a faint fuel knock. Only other thing I thought about was the fuel pressure regulator sticking every once in a while bleeding off some fuel pressure.
Thread Starter
|
Cargo Master
Joined: Dec 2007
Posts: 2,039
Likes: 310
The oil is due to be changed, so it will get done in the next couple days.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
I second this. Also adding 2-cycle oil to the fuel makes a huge difference, too.
Thread Starter
|
Cargo Master
Joined: Dec 2007
Posts: 2,039
Likes: 310
I try to run fuel that has some bio-diesel in it...used to make it and run it straight. I'll have to mix in some 2-cycle oil as I have some sitting over where I store my boats.
Thread Starter
|
Cargo Master
Joined: Dec 2007
Posts: 2,039
Likes: 310
Trending Topics
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
You don't need much. 100-1 is plenty. I'll put 8 oz in my VW TDI and fill it with 12-14 gallons and that's all that is needed to make a difference. The Ford, I'll get a gallon of cheap 2 cycle oil and pour it into the 98 gallon aux tank and that's all I need for the whole fuel supply, and it also feeds the 35 gallon main tank.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Laughing Gas
Joined: Jun 2013
Posts: 1,098
Likes: 514
From: Yokosuka Japan
showing my lack of knowledge here...
You don't need much. 100-1 is plenty. I'll put 8 oz in my VW TDI and fill it with 12-14 gallons and that's all that is needed to make a difference. The Ford, I'll get a gallon of cheap 2 cycle oil and pour it into the 98 gallon aux tank and that's all I need for the whole fuel supply, and it also feeds the 35 gallon main tank.
what does adding 2 stroke oil into the fuel do for a diesel?
Thread Starter
|
Cargo Master
Joined: Dec 2007
Posts: 2,039
Likes: 310
Years back the sulfur was pulled way back out of diesel fuel...much like lead was pulled out of gasoline in the 70's...which is the lubrication. When this happened we were getting nothing but ultra low sulfur diesel fuel which was causing premature wear on fuel system parts...mainly injectors. I was making and running biodiesel at this time and many were adding some 2 stroke oil to add the lubrication back into the fuel. Biodiesel...according to several studies...was the best lubrication alternative, plus it's a great solvent for cleaning your fuel system...tank, lines, injector tips, etc. really good. Because of it's great lubrication properties, this is probably why you now see it at the pumps in percentages around 5%-20% added tot he ultra low sulfur dino diesel. I can still find a local guy that makes and sells biodiesel straight out of the pump...it's a little more pricey and a drive across town. So I'll mix in some 2 stroke for now and maybe pick up some bio diesel when I'm over that way...
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,122
Likes: 4,725
From: Henderson, NV
Interestingly, the trend towards blending biodiesel into regular diesel has now brought lubricity and a mild cleaning effect back to the fuel we use. Biodiesel isn't so great for the newer common-rail diesel engines but we here in 7.3 land don't care aabout that. In MN, the mandate is for a minimum of B20 now.
Thread
Thread Starter
Forum
Replies
Last Post
strokin'_tatsch
1994.5 - 1997 7.3L Power Stroke Diesel
96
Mar 3, 2010 09:01 AM