93 7.3 knocknig bad
Thread Starter
|
Junior User
Joined: Oct 2005
Posts: 80
Likes: 0
From: New Mexico
93 7.3 knocknig bad
Heres the situation My 93 IDI turbo diesel started knocking lately and Ford wants $700-$1200 for a fix they think it might be possibly the injector they said?
I was going up a hill no load at about 45mph(const zone) when something sounded as it was coming loose then it sounded as something broke and it started to knock some puilled over and found no fluid leaks and oil level was good drove it back home another 10 miles slowly and the knock was louder with the motor running my daughter sitting in the passenger seat said it sounds as if something was getting thrown around so I got out and stood on the passenger side of the vehicle when I heard the same as if something was getting knocked around when idelnig.
Any others out there have a clue of what it might be? I 2weeks earlier paid $3000 to repair injector-pump-fuel and all oil leaks buy pulling out the motor a major fuel leak happened after one of the injector plastic covers went bad it was gushing fuel out by the end of the day they fixed that then this!
Need advice please...
I was going up a hill no load at about 45mph(const zone) when something sounded as it was coming loose then it sounded as something broke and it started to knock some puilled over and found no fluid leaks and oil level was good drove it back home another 10 miles slowly and the knock was louder with the motor running my daughter sitting in the passenger seat said it sounds as if something was getting thrown around so I got out and stood on the passenger side of the vehicle when I heard the same as if something was getting knocked around when idelnig.
Any others out there have a clue of what it might be? I 2weeks earlier paid $3000 to repair injector-pump-fuel and all oil leaks buy pulling out the motor a major fuel leak happened after one of the injector plastic covers went bad it was gushing fuel out by the end of the day they fixed that then this!
Need advice please...
Posting Guru
Joined: Sep 2002
Posts: 1,897
Likes: 0
From: Northeastern Pa - USA
are you mechanically inclined ?? there are tests that you can do at the home garage before getting raped by a garage. it is hard to diagnose a knock in a diesel engine because they are knocking all the time.
you could short out each cylinder and determine which side is causing the problem. to short out a cylinder you loosen the fuel line nut on top of each injector - one at a time with the engine at idle. if there is no difference after you see fuel leaking from the nut, that will be the problem cylinder. the problem could be a stuck injector a worn injector or a problem in the valve train.
might also be in the new injection pump too.
be careful as you work around the idling engine so you dont get caught up in moving parts while performing the above tasks. the fuel line nuts will take a 5/8 wrench and the one with the adapter on it will take 2 wrenches to loosen the fuel line at the top.
you could short out each cylinder and determine which side is causing the problem. to short out a cylinder you loosen the fuel line nut on top of each injector - one at a time with the engine at idle. if there is no difference after you see fuel leaking from the nut, that will be the problem cylinder. the problem could be a stuck injector a worn injector or a problem in the valve train.
might also be in the new injection pump too.
be careful as you work around the idling engine so you dont get caught up in moving parts while performing the above tasks. the fuel line nuts will take a 5/8 wrench and the one with the adapter on it will take 2 wrenches to loosen the fuel line at the top.
Thread Starter
|
Junior User
Joined: Oct 2005
Posts: 80
Likes: 0
From: New Mexico
seems to have minimal power loss but havent tried much after knocking sound. kinda babied it since and havent driven since, starts well still runs but...
Has aroun 280000+ miles and just stock oil pressure gauge which seems to be in same zone which is normal.
Has aroun 280000+ miles and just stock oil pressure gauge which seems to be in same zone which is normal.
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
Wanna tell us what trans is in it........thanks.
Could be a valve ......they will wear the guides and end up dropping down and not returning completely into the head.....thus the piston hits the valve due to almost zero clearance... might have to do a comprssion test.
Other thought could be a GP tip is in the cylinder either from previous removal or new broken tip.......have you replaced GPs recently.
Could be a valve ......they will wear the guides and end up dropping down and not returning completely into the head.....thus the piston hits the valve due to almost zero clearance... might have to do a comprssion test.
Other thought could be a GP tip is in the cylinder either from previous removal or new broken tip.......have you replaced GPs recently.
Thread Starter
|
Junior User
Joined: Oct 2005
Posts: 80
Likes: 0
From: New Mexico
Manual 5spd ZF5 that was replaced about 1-1/2 years ago havent messed with the gp's in a while cause the trucks been starting good.
Again ford said it might be one of the fuel injectors, it did have a blue smoke issue and was going to take it in for that but when that knocking noise happened the smoke almost went away not all of it but alot of it, if that helps any on figuring out the problem.
Again ford said it might be one of the fuel injectors, it did have a blue smoke issue and was going to take it in for that but when that knocking noise happened the smoke almost went away not all of it but alot of it, if that helps any on figuring out the problem.
Thread Starter
|
Junior User
Joined: Oct 2005
Posts: 80
Likes: 0
From: New Mexico
after getting the oil and fuel leaks fixed I started to have one of the injectors leak which was fixed but still had an issue of blue smoke which I never had before taking the truck in after the 'knocking' sound the blue smoke pretty much went away any ideas on what could cause this?
Trending Topics
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
Sounds like one of the injectors was not closing completely.
The fuel was just draining into the cylinder when it should not be causing the smoke.
The knock may be from compression getting into the injector because the pintle is not closing at all now.
The fuel was just draining into the cylinder when it should not be causing the smoke.
The knock may be from compression getting into the injector because the pintle is not closing at all now.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
Posting Guru
Joined: Sep 2002
Posts: 1,897
Likes: 0
From: Northeastern Pa - USA
byrd, short out each cylinder and see which is causing the problem. As Dave stated, it does sound like an injector not working properly. One cylinder will sound like the devil is trying to get out when an injector is acting up.
If you have high mileage on the engine without previous maintainance, that would be a good bet on the injectors. You could also use a heavy dose of diesel kleen or some fuel conditioner to help clean it up, BUT, if the injectors are galled, you cant fix em with additive.
If you have high mileage on the engine without previous maintainance, that would be a good bet on the injectors. You could also use a heavy dose of diesel kleen or some fuel conditioner to help clean it up, BUT, if the injectors are galled, you cant fix em with additive.
Thread Starter
|
Junior User
Joined: Oct 2005
Posts: 80
Likes: 0
From: New Mexico
Ford wants $700-$1200 to check all injectors and fix just the ONE thats bad Im guessing that ONE might be broke? Well I think that might be too much and would rather replace all the injectors with new ones thats recommended by those here and maybe go else where to get it done dont you think and shoul it really cost what theyre asking?
Oh and no previous service of the injectors have been done
Oh and no previous service of the injectors have been done
Last edited by dyrtbyrd; Jul 5, 2007 at 05:47 PM. Reason: adding info
Laughing Gas
Joined: Aug 2003
Posts: 919
Likes: 4
From: Newberg Oregon
Originally Posted by dyrtbyrd
Ford wants $700-$1200 to check all injectors and fix just the ONE thats bad Im guessing that ONE might be broke? Well I think that might be too much and would rather replace all the injectors with new ones thats recommended by those here and maybe go else where to get it done dont you think and shoul it really cost what theyre asking?
Oh and no previous service of the injectors have been done
Oh and no previous service of the injectors have been done
Thread Starter
|
Junior User
Joined: Oct 2005
Posts: 80
Likes: 0
From: New Mexico
I was not believing them but in a bind I thought this the way to go but after talking here and letting the dissapointment of the truck making that nasty sound pass I realize they want too much and will not get the work done there. I will buy parts myself and go from there but I will have to look around for help on this 'two heads are better than one'
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
Changing injectors is only slightly harder than changing spark plugs on a gas motor.
The part that makes it harder is the steel injection lines and the return lines.
But they are on top of the motor, you can see them, so in the end it may be even.
A turbo makes it slightly harder.
After we fixed the glow plug problem with the wrong relay....this should be cake work.
The part that makes it harder is the steel injection lines and the return lines.
But they are on top of the motor, you can see them, so in the end it may be even.
A turbo makes it slightly harder.
After we fixed the glow plug problem with the wrong relay....this should be cake work.
Last edited by Dave Sponaugle; Jul 5, 2007 at 08:08 PM.