injector advice

[Crbav8r]

OK,

Have been chasing a cold start problem for a few months. I have gone through the glow plug system, and feel that my issue is in the injectors. I read some about stiction, but it sounds like that is an issue with the 6.0.

Does the 7.3 have the same issues? What is the best way to clean the injectors?

New glow plugs
new batteries
new starter
new GPR
248,000 miles on truck
truck will not start without numerous cycles of the glowplugs below 50deg.
when it does, it lopes on 5-6 cylindars until it warms up.
will start on one cycle above 50deg, but acts the same
compression is good
buzz test is good, but it was done warmed up(mechanic said needed)
truck runs beautiful for everything else. pulls hard and never misses.
have Hot Shot in the crankcase now with 1500 miles on it.

thoughts????

 

[BigAlsPSD]

Best way to really now what is going on with your injectors would be to send them off for testing. Buzz test cold would probably show different results, you could remove the valve covers and watch the oil discharge cold vs hot as well to see which injectors are not firing very well.

Full Force Diesel Flow Testing

 

[Crbav8r]

they are stock injectors. trying not to have to pull them out just yet. if i was i would just replace them.

 

[BigAlsPSD]

Pretty sure that in the event that they were determined bad, the money could be applied in some amount towards replacements.

As for stiction, I am not familiar with it on the 7.3's but I know there are products available AD9000 IIRC. I have not ran any additives in the fuel other than diesel kleen and 2 stroke oil.

 

[Crbav8r]

Oh, and it runs great after being plugged in

 

[BigAlsPSD]

Sounds like worn injectors as a first guess without cold buzz, or watching oil discharge...

 

[Lowdown89]

as strange as it may sound, i searched and searched on a issue almost identical to yours and it turned out to be the Low pressure oil pump.. i found a thread on a different forum(can't remember whic one but will look when it get home) and the guy was having the same problems... for the price of the LPOP its not a bad thing to try before you go swapping other parts

 

[Crbav8r]

Can you explain worn injectors? I dont know the inter workings of these things. What is it that goes bad? If it is worn metal, would it run as well hot, or plugged in? Is it just sludge or varnish on the inside keeping the injector parts from moving when cold?

 

[Crbav8r]

Lowdown89, don't know how that could be bad, but there is alot of things that I don't know! Let me know if you find that thread.

Thanks

 

[Crbav8r]

Lowdown89,
was it on your truck?
i'm also a 01 CC DRW

 

[Strokin Platinum]

If it helps any when your injectors go bad usually the truck wont start at all in colder weather without being plugged in. I let my go on like that for a month or so and it got to the point it wouldn't start plugged in in 50* plus weather...

 

[Lowdown89]

Lowdown89,
was it on your truck?
i'm also a 01 CC DRW

Yes, I searched and searched looking for an answer to my problem and I'm not saying thats what yours is, but for less than $100 it can't hurt to change it since you have that many miles on your truck... My truck would not start at all without plugging it in if it was the least bit cold.. The truck had new injectors, new IPR, ICP sensor and numerous other parts I threw at it and after swapping out the LPOP it started like it was new

 

[Lowdown89]

Here is a thread showing some LPOP symptoms and a write up on the repair... Like I said I'm not saying that's certainly your problem but it might be worth trying

http://www.ford-trucks.com/forums/985332-melling-lpop-install.html#post9248539

 

[Crbav8r]

thanks for the help. I'll check that thread out.

 

[Crbav8r]

My ICP is great. Can this be if the LPOP is weak?

 

[BigAlsPSD]

You can easily check your oil pressure of the LPOP with a gauge plumbed into the oil filter base, there are some plugs there.

On the worn injectors, I have not and do not rebuild injectors so it is a guess but I would think internal o rings would be some wear items, maybe plungers and barrels, armature clearance issues from the poppet valve wearing. Mostly internal leaks allowing high pressure oil to seep and leak around parts and not act efficiently.

 

[golfer]

OK,

Have been chasing a cold start problem for a few months. I have gone through the glow plug system, and feel that my issue is in the injectors. I read some about stiction, but it sounds like that is an issue with the 6.0.

Does the 7.3 have the same issues? What is the best way to clean the injectors?

New glow plugs
new batteries
new starter
new GPR
248,000 miles on truck
truck will not start without numerous cycles of the glowplugs below 50deg.
when it does, it lopes on 5-6 cylindars until it warms up.
will start on one cycle above 50deg, but acts the same
compression is good
buzz test is good, but it was done warmed up(mechanic said needed)
truck runs beautiful for everything else. pulls hard and never misses.
have Hot Shot in the crankcase now with 1500 miles on it.

thoughts????

it's the injectors...the poppet valves within them actually...

the poppet valve is what seals the HPOil inside the injector...when these valves wear...during cold starts (cold, thick oil)...the oil can't flow through these (worn) valves very well...

once the oil (warms up &) thins out, and the engine heats up...the engine may run really good, since the thinner oil can now flow through the worn poppets more freely...

factoring in the # of miles, & the (hard to start when cold, low power when cold(?)) symptoms...your symptoms are verbatim of just normal, higher mileage injectors...