Buying A 1986 F-250 - Diesel Forum -
6.9L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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post #1 of 9 (permalink) Old 02-09-2009, 10:01 PM Thread Starter
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Buying A 1986 F-250

i'm buying a 1986 tomarrow with the 6.9 diesel that doesnt run, he said that it wouldn't start unless he poured some diesel fuel in the intake then it would start and stay running and that worked for him for a while now it wont start at all what do you guys think? im going to test the gps tommarow and check fuel pressure from the mechanical pump what else should i try he said it ran perfect when running.

2003 F-250 6.0 74000miles Reg Cab 2wd.
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post #2 of 9 (permalink) Old 02-10-2009, 10:00 AM
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I think I'd steer clear of that one. My Crap Detector is going off. Diesel engines fire off when fuel is sprayed (HIGH pressure) into the cylinder during the compression stroke. Liquid diesel poured into the intake would be about as effective as lemonade.

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'91 F-250 SC 4X4, 5spd. ATS Turbo, 3:55 diff.
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post #3 of 9 (permalink) Old 02-10-2009, 10:57 AM
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Depends on the pricing and condition. You can put quite a bit into a $500 truck with four wheel drive and a decent body and be in good shape. You can't do well with a $2500 rust bucket that needs tires and brakes with two wheel drive and a bad transmission that you cannot diagnose because it does not run.

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post #4 of 9 (permalink) Old 02-10-2009, 11:43 AM
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Pouring Diesel or any liquid in the intake is a great way to hydro-lock the engine and bend a rod.

The guy with the truck is a BS artist.

Red 86 F250 Supercab XLT: Longbed, 6.9l, 4 speed with DNE-2 Overdrive, 2WD, 10.25 Sterling 4:11, Reclining Highback Captains chairs with arm-rest, Holly Red pump, push-button glowplugs, Racor 645 water separator with fuel heater, K&N Air Filter, Headlight Relay Upgrade, Fog Lights, lots of extra lights, Isspro EV series: Pyro, Oil Pressure, and Voltage in a Autometer 3 pod A-pillar. Bulldog Security System with remote entry. Offset Mirror Upgrade, Remote lube TOB. Road Watch System coming soon. PB PS PW PDL CC AC IW
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post #5 of 9 (permalink) Old 02-13-2009, 12:48 PM Thread Starter
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Yeah i thought diesel in the intake wouldnt do anything so i asked him when i was there if he was using starting fluid he said he was didnt really bother me too bad because i knew that if he had to use that the glowplugs were probley burnt, so i brought a battery to try to turn the engine over and the sender by the thermostat housing started to smoke so i unplugged it, then turned it over it barely wanted to move it had been sitting for a year, so he was asking 900 i paid 600 its a 1986 f-250 2 wheel drive in great shape for the year and only 157,000 on it and 5000 miles on new trans and good tires, so when i got it home i put a couple used batteries in it and hooked it up to the charger still not turning fast enough so i went and bought 2 850ca and 1000cca batteries and installed them still slow and no firing, next day i went and bought a injection pump from a junkyard installed it still nothing, so i remembered on my 6.9 when it turned slow the starter was cooked so i took the new one off my other 6.9 and put it on my new one sprayed a tiny bit off either and she fired right up runs very smooth and quiet and more get up and go than i expected, so i bought new gps which the old ones were all burnt 2 were stuck but i got them out without breaking tips but what else to expect when there champions, bought a couple new parts to get it on the road, now i go outside wait for the gps and it fires right up, the only thing is the high idle isnt getting power and that sender by the thermostat housing was smoking i forgot what that was. but other wise a real good truck that i could easily triple my money on but i love the old 6.9s and its staying with me, i'll get some pics up soon. Now i think it was the gps and starter all along my other injection pumps still good, its nice to have a extra one and i only paid 79.00 for the one thats on it and a air cleaner assembly.

2003 F-250 6.0 74000miles Reg Cab 2wd.
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post #6 of 9 (permalink) Old 02-13-2009, 05:15 PM
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I think u did alright and got a good deal on it all these other guys where doubting it saying it was all bs but hell I dont know the guy that sold it to u but maybe he dont know jack about diesels. But u took it upon yourself to check it out and got the old girl runnin. Sometimes its good to just tackle an old project like that cause they can come out smelling like a rose. I would of done the same thing u did, even if it wouldn't of worked out for 600 bucks u could of got ur money back it parts, I say u made the right move.

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post #7 of 9 (permalink) Old 02-13-2009, 06:11 PM Thread Starter
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thanks sanmanf250, thats about right he didnt know anything about diesels, but you can usally read people when you go to buy something from them. So he seemed honest and i took his word for it that it ran great before it wouldn't start and he was right it runs great!

2003 F-250 6.0 74000miles Reg Cab 2wd.
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post #8 of 9 (permalink) Old 02-13-2009, 08:44 PM
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I think you did pretty good! I would also like to see some pics!


1984 F250 6.9 C6 2WD Push Button Glow plugs, No Soup bowl. Wix 33439 Water Separator, Carter P4594 fuel pump, Custom 3" Exhaust, NTZ Oil Bypass Filter, VDO Vision water temp gauge, ISSPRO EV Pyro
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post #9 of 9 (permalink) Old 02-13-2009, 09:50 PM Thread Starter
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Thanks I'll Take Some Tomarrow

2003 F-250 6.0 74000miles Reg Cab 2wd.
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