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Old 09-29-2013, 01:00 PM
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my new truck! barely running

Hey guys!

I acquired a 1997/1998 F250 single cab, 2wd, 7.3 with a 5spd tranny. Its a great truck and for the price i paid, i couldn't say no. The problem is it isn't running right. first of all it leaks a lot of oil from the top of the rear of the motor, doesn't look like turbo but i'm not sure yet. secondly, i had to pull start it to get it running (probably just because there was no fuel in the bowl or so) It now runs but it sounds like crap, it sounds like its not firing on all cylinders. Its also smoking white. it idles but if i suddenly give it throttle, it dies. I don't know enough about the 7.3s to go any further. It sounds to me like injectors. Is there a way to test them? The check engine light is on, but my code reader isn't giving me any actual codes.

Any advice is greatly appreciated!!!!
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Old 09-30-2013, 06:18 AM
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Buzz test or him check the injectors, may as we'll check the continuity of your glow plugs while harness is disconnected too. I'm sure someone will find you a link to do it. Check the fuel pressure at the fuel bowl.

There could be a multitude of problems but that would be some of the many places I would check first.

Sorry for brief reply, on my cell phone which is a pain to type on!

You may also want to consider posting up a video of the truck while she is running.
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Old 09-30-2013, 06:19 AM
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"Ohm check injectors"
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Old 09-30-2013, 06:31 AM
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I appreciate the responses, Is there a way to buzz test the injectors without taking it to Ford? I was going to pull the valve covers off with it running and unplug the injectors one by one to see if they all make a difference in the way it runs. Its been sitting for years with the diesel in it, but diesel doesn't really go bad, does it?

what resistance should I have in the injectors if I ohm check them?
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Old 09-30-2013, 06:42 AM
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Thumbs up

Here is a video of the truck idling. It actually doesn't sound all too bad but you can see how shaky it is.

IMG 2559 - YouTube

I couldn't figure out how to upload one into the site.

Thanks for the help!
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Old 09-30-2013, 10:29 AM
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You could get algae growth in the fuel. If you end up with black, slimy stuff on the fuel filter, that's probably what it is. They make biocide treatments for it. Cheers!
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Old 09-30-2013, 01:45 PM
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Hey Bro, that ride is running real rough. No real way of buzz testing unless you spend either the money down at the local diesel specialist or buying a tester like Autoenginuity.

Like I said, checking the injectors through the harness is easy enough just with a multimeter and will take less time than taking cover off and pulling each connection in turn. There are 2 harnesses on both sides, in those harnesses there are 5 pins. The 2 outside pins (1 and 5)are for glowplugs, I checked mine the other day and have 1 out. If you go from ground to each outside pin your readings should be around 0.5 to 2.0 ohms. Then check the 2nd and 4th pin against the common (middle pin), these are your injectors and should read under 5 ohms.

Check inside your fuel bowl and see what kind of condition its in. There is a small wire mesh in the FPR that can get clogged up too. There should be a small schreider valve (looks like an air fitting on tires) on the side of the fuel bowl, this can be used to see if there isn't any fuel starvation to this point. The reading should be between 40-60psi.

When was the oil last changed? These truck rely heavily on good oil changes especially as the injectors are operated via the HPOP (aswell as electrical). If she has been sitting for a while then maybe look at getting some RevX in with your next oil change.

Check the EBPV and clean

When was this video taken? Did the engine have a chance to warm up?

Generic code readers won't read these trucks, Ford pretty much have that "problem" sown up so you have to pay the stealers a visit.
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Old 09-30-2013, 02:29 PM
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^^^^^^That is a good video but be advised that EGR tube on our trucks is in a different location but much easier to get to. It is attached to the backside of the HPOP reservoir and between the fuel bowl on the passenger side.

There are a lot of videos on cleaning the fpr screen too. Both these jobs together should take about an hour for your first time. My tube though had to be replaced it was so clogged and I tried everything.....except oven cleaner which some swear by.

I assume the truck had been sitting for a while before you bought it. You may have got algae in you tanks. If your fuel filter is black it will be from either injector orings or from algae in your tanks. If algae is the case, an algaecide is available and I would also put in some Power Service Diesel Kleen.

The oil leak could be from the EBPV Exhaust back pressure valve. these are notorius leakers. An easy search will give more info than you can read in a lifetime.
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Old 09-30-2013, 02:52 PM
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Thanks guys! I don't know what I'd do without y'all!! I will ohm-test the injectors tonight. I assume I do this while its running and then see if there is one or more injectors that read much different than the rest?

I also figured out today that my glow plug solenoid or whatever it is called isn't working at all. I'll replace that tomorrow.

The video was taken Yesterday, the truck had just opened up its thermostat and pumped water so it wasn't warmed up all the way yet.
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Old 09-30-2013, 03:27 PM
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Quote:
Originally Posted by neattouch648 View Post
Thanks guys! I don't know what I'd do without y'all!! I will ohm-test the injectors tonight. I assume I do this while its running and then see if there is one or more injectors that read much different than the rest?
This test between the common and injector pins are just to see if they are within range and getting the correct resistance. This can be done with the engine off, as well as glow plugs but that test is between a good ground and glow plug pins.

How the injectors are actually firing is another ball game. Youtube Buzz Test and see what the results are from having a bad injector. The rough idle doesn't mean you have any injectors out, could just be the fuel issue instead.


Quote:
I also figured out today that my glow plug solenoid or whatever it is called isn't working at all. I'll replace that tomorrow.
A new GPR is around $30 so always worth replacing, along with any GP's that may be shot. I just changed mine out from the PO who had installed Autolites, I went back to Motorcraft.

Quote:
The video was taken Yesterday, the truck had just opened up its thermostat and pumped water so it wasn't warmed up all the way yet.
While you are getting a new GPR, you have already been advised to clean out the FPR screen, so replace the fuel filter too. Check the bottom of the fuel bowl too incase there is any heavy settlement/sediment in there too.

Did you say when the oil was changed last? Get some Rotella in there.
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