Think it’s time to pull the engine
Thread Starter
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Junior User
Joined: May 2020
Posts: 60
Likes: 1
I wouldn’t run any 6.7 Ford just because of the fuel pump, let alone all the other garbage that has to fall off the engine to get it to run right. Cummins stepped in it with the 19’s and 20’s by putting that CP4 pump on it but they went back to the CP3 for 2021 lol. At least they’re men enough to admit that was a lousy idea and really hurt their brand.
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
These engines don’t have bottom end failures very often. A rod knock is highly unlikely, but a ‘fuel’ knock is HIGHLY likely.
Im sorry to pick on you about confidence in the injectors. An injector failure that renders the truck undriveable is very unlikely. For example, you probably have one (2?) now.
I would consider swapping that injector for another one and see if the problem follows after checking resistance, etc (and ruling out a wiring problem).
Buzz test OK?
Im sorry to pick on you about confidence in the injectors. An injector failure that renders the truck undriveable is very unlikely. For example, you probably have one (2?) now.
I would consider swapping that injector for another one and see if the problem follows after checking resistance, etc (and ruling out a wiring problem).
Buzz test OK?
Thread Starter
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Junior User
Joined: May 2020
Posts: 60
Likes: 1
These engines don’t have bottom end failures very often. A rod knock is highly unlikely, but a ‘fuel’ knock is HIGHLY likely.
Im sorry to pick on you about confidence in the injectors. An injector failure that renders the truck undriveable is very unlikely. For example, you probably have one (2?) now.
I would consider swapping that injector for another one and see if the problem follows after checking resistance, etc (and ruling out a wiring problem).
Buzz test OK?
Im sorry to pick on you about confidence in the injectors. An injector failure that renders the truck undriveable is very unlikely. For example, you probably have one (2?) now.
I would consider swapping that injector for another one and see if the problem follows after checking resistance, etc (and ruling out a wiring problem).
Buzz test OK?
Fleet Mechanic
Joined: Nov 2006
Posts: 1,664
Likes: 219
From: Northwest
My 200k mile benchmark is "across the board" .........
One owner, excellent maintained, heaviest load is 5 bags of groceries, never pulled a trailer, parked in a garage, lives in a state below the Mason Dixon line, never need to plug it in.. I agree that it will run 300k miles.
Fleet truck, hot shot runner, pulling a gooseneck with 30k, north of the Mason Dixon line, several different drivers, death wobble, salt build up on frame and body, out of balance tires (shook to pieces).. 200k and it's toast.
We have many, many prospective buyers coming on FTE asking "Should I buy this Truck?".... After some discussion, it becomes evident if they Should... or ... Should Not buy that truck....
Hobo
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Damn, I spend the afternoon buttoning up my daughters jeep and resealing my hpo fittings come back to find all this negativity. Rod knock or piston/cylinder problem less likely to be going away when unplugging the injector. Work through the fuel system make sure it's getting plenty of clean airfree fuel at proper #.
Thread Starter
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Junior User
Joined: May 2020
Posts: 60
Likes: 1
Damn, I spend the afternoon buttoning up my daughters jeep and resealing my hpo fittings come back to find all this negativity. Rod knock or piston/cylinder problem less likely to be going away when unplugging the injector. Work through the fuel system make sure it's getting plenty of clean airfree fuel at proper #.
I got a motor swapped in a old Toyota today I’ve been meaning to get out of my way. Drove the 7.3 and it’s got some fuel smoke at a warm idle, I did a contribution test and it failed 2,3,and 7 however it still runs out great just feels slightly off at idle and smokes a little. I left the truck at the shop so hopefully I’ll get some diag time into it while I wait for my new fuel lines to show up from riff raff.
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Fleet Mechanic
Joined: Nov 2006
Posts: 1,664
Likes: 219
From: Northwest
I have a knock that just started. I thought it was a fuel knock at first because it would go away when I let off the throttle. I pulled the pass valve cover and checked torques on injectors because I only have 5k on them. It quickly went to knock all the time. Pulled valve cover again and unplugging #1 makes it go away, so I swapped it for a 9th injector I ordered from full force and it continues to knock.
At this point I’m thinking piston. Any other things I should check before I go down that road?
If I pull the engine to replace the pistons how far do I go? 2000 with 240k. Still runs great and no excessive blow by.
Thanks for any input.
At this point I’m thinking piston. Any other things I should check before I go down that road?
If I pull the engine to replace the pistons how far do I go? 2000 with 240k. Still runs great and no excessive blow by.
Thanks for any input.
Hmmmmm .... Sounds like a man asking for opinions.
Hobo
Thread Starter
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Junior User
Joined: May 2020
Posts: 60
Likes: 1
yeah on diagnosis strategies on a knock. Not on how long you feel one should own a truck. I have a couple rigs over 200k and the maintenance is far less than a payment. This truck is clean and rust free. Have a great night and move on.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
I would have to agree. One person telling me to put a Cummins in it and another telling me 200k is too many miles. Didn’t ask for either of there opinions and wonder why they are trolling a 7.3 forum.
I got a motor swapped in a old Toyota today I’ve been meaning to get out of my way. Drove the 7.3 and it’s got some fuel smoke at a warm idle, I did a contribution test and it failed 2,3,and 7 however it still runs out great just feels slightly off at idle and smokes a little. I left the truck at the shop so hopefully I’ll get some diag time into it while I wait for my new fuel lines to show up from riff raff.
I got a motor swapped in a old Toyota today I’ve been meaning to get out of my way. Drove the 7.3 and it’s got some fuel smoke at a warm idle, I did a contribution test and it failed 2,3,and 7 however it still runs out great just feels slightly off at idle and smokes a little. I left the truck at the shop so hopefully I’ll get some diag time into it while I wait for my new fuel lines to show up from riff raff.
I wouldn't put much stock in that cct it's more often ghosts and false positives. I did have a bad motor with 2 completely trashed cylinders(5&7). It never flagged them.
Thread Starter
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Junior User
Joined: May 2020
Posts: 60
Likes: 1
86 yota pu, the 22r is pretty tough until you quit changing the oil and keeping it full. She drove it for three weeks with the oil light on with it making noise for the last week of that. Added a window to the block.
I agree on the cct, sure would be nice to be able to carry out the power balance test.
I agree on the cct, sure would be nice to be able to carry out the power balance test.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
86 yota pu, the 22r is pretty tough until you quit changing the oil and keeping it full. She drove it for three weeks with the oil light on with it making noise for the last week of that. Added a window to the block.
I agree on the cct, sure would be nice to be able to carry out the power balance test.
I agree on the cct, sure would be nice to be able to carry out the power balance test.
Butt-Head
Joined: Apr 2004
Posts: 9,448
Likes: 2,934
From: Reed Point, MT
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,352
Likes: 5,946
From: Lake Hartwell, GA
For those in the future following along for troubleshooting procedures and wanting to know what PCR means, here is a basic description found via Google:
https://www.genome.gov/about-genomic...ion-Fact-Sheet
It is not related to the testing of a 7.3L in anyway, but it is a play on words (acronym in this case) that brings a bit of humor (or sadness based on your view) to the events over the past 12 months.
https://www.genome.gov/about-genomic...ion-Fact-Sheet
It is not related to the testing of a 7.3L in anyway, but it is a play on words (acronym in this case) that brings a bit of humor (or sadness based on your view) to the events over the past 12 months.