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Using Glow Plugs to Super tune the engine

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  #436  
Old 12-21-2011, 05:06 PM
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well then it looks like i have 4 bad injectors as i replaced all the glowplugs with breu ones.
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  #437  
Old 12-21-2011, 06:35 PM
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I would run the test again and make sure your connections are good. I find it hard to believe that 4 or more injectors would be that bad and the engine still run without some serious smoke and shaking. If it is that bad, you are looking at a full injection overhaul: new IP, injectors, return lines and timing set.
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  #438  
Old 12-22-2011, 12:14 AM
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Quote:
Originally Posted by eatont9999 View Post
I think crossbones got fed up with all the BS people were giving him and went somewhere else or picked up a new project. This thread helped me pinpoint a bad injector and fix a rough idle and poor MPG on my truck, so it is worth at least that. I read the whole thread and have been suggesting methods from it to new members and old members. Some think it is valid and some don't understand.

Skip,

You either have several bad glow plugs or several bad injectors. You shouldn't be getting a reading of 0. It should also be tested in millivolts.
My take on this is that the GPs are acting as thermocouples to measure the combustion temperatures. They should be the same. Any deviation from the average indicates a problem. Kudos to you, Eatont9999 for using this procedure and finding your problem.
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  #439  
Old 12-22-2011, 12:17 AM
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Originally Posted by eatont9999 View Post
I would run the test again and make sure your connections are good. I find it hard to believe that 4 or more injectors would be that bad and the engine still run without some serious smoke and shaking. If it is that bad, you are looking at a full injection overhaul: new IP, injectors, return lines and timing set.

ya it shakes some. and smokes some too. but the oil level is overfull.
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  #440  
Old 12-22-2011, 12:36 AM
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so i was checking ohms resistance, we are supposed to be testing milivolts?
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  #441  
Old 12-22-2011, 11:02 AM
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In theory, ohms would go down the hotter the plug got. That may explain the 0 reading you got. Those may actually be good injectors. Try it again with millivolts and you should get a more accurate reading and something we can work with. Why is the crankcase overfilled? Fuel pump leaking into the case or did you put too much oil in? It could account for some of the smoke and running rough.
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  #442  
Old 12-22-2011, 05:41 PM
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Quote:
Originally Posted by eatont9999 View Post
In theory, ohms would go down the hotter the plug got. That may explain the 0 reading you got. Those may actually be good injectors. Try it again with millivolts and you should get a more accurate reading and something we can work with. Why is the crankcase overfilled? Fuel pump leaking into the case or did you put too much oil in? It could account for some of the smoke and running rough.

idiots owning it before me. thats why its over filled.
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  #443  
Old 12-22-2011, 05:47 PM
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i have a craftsman pro multi meter i set it on ohm and it autoranges. heres my readings at operating temp and idling after a short drive.

dont know if my meter is working good or not, anyhow shakes pretty good and blue smoke all the time from exhaust. just got truck and it wasent even bypassed the original wate sep so i did that but waiting on cap and line kit still. 85 6.9 na

thanks

skip
maybe i will swap out some injectors on the passanger rear and drivers front with some i got laying in the barn see if it will matter much.
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  #444  
Old 12-22-2011, 06:00 PM
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idiots owning it before me. thats why its over filled.
be sure she's not too overfull or you could be in for a surprise.
search: runaway diesel.
a little time spent with your drain plug to lower the oil level, could possibly save you a major catastrophe.
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  #445  
Old 12-22-2011, 10:38 PM
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Originally Posted by FORDF250HDXLT View Post
be sure she's not too overfull or you could be in for a surprise.
search: runaway diesel.
a little time spent with your drain plug to lower the oil level, could possibly save you a major catastrophe.

ya think im gonan just suck it out the dipstick tube, looks to be maybe 1/2 quart or so.
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  #446  
Old 01-14-2013, 07:16 PM
Mmurph500 Mmurph500 is offline
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Just bought 1986 F250 4x4with 6.9 diesel with banks turbo smokes pretty bad and hard to start in cold weather . How do I tell if glow plugs are good and the block heater
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  #447  
Old 01-14-2013, 07:20 PM
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And the fuel mileage is terrible!
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  #448  
Old 01-14-2013, 10:09 PM
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Well, for the block heater, I would look at the wiring to be sure it is intact from plug to block as some crack as they age and can short out.
Then you could either check for continuity between the plug blades, or just plug it in and see if the engine is warmer than the outside temp after a couple hours.

The glow plugs are also a continuity test between the single wire connection tip and the block.
I would also blow compressed air to clean the glow plug area and unscrew each one and look at the tip.
Compare it to a new one (pr a picture of one).
If the tip is broken off or swollen, it needs to be replaced.
If it unscrews but does not come out it is extremely swollen and can be an issue to get out.

Bad fuel mileage??

No clue what that is without numbers!

The best I got was 19 mpg city and 24 mpg freeway by hypermiling.

What I would consider a reasonable average might be 10 city and 18 freeway if you keep up with today’s traffic.
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