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6.9L Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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Old 04-20-2007, 11:07 PM   #1 (permalink)
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Start. Then stall out ??

I have a 1986 F250 6.9L. I have a problem with it. It starts after glow plug light goes off then it stalls. It will start after I crank it for 2 to 5 mins. I took it to a shop and had the glow plugs replaced.(500.00) I thought that was steep. The guy also put a additive sedadye or something like that in it. He also said It need the injector pump timing advanced ($100 more) This was 3 month ago It was starting and running fine with nappa diesel additive. Now its up to the same old tricks of starting and stalling and starting again. The glow plug light has always blinked on and off for 30 sec at a time even after starting?? Then it shut off after 2 or 3 min. Do I need a injector pump or can the timing be advanced? where is this pump located and how is this done? Any help please. :shrug:
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Old 04-21-2007, 07:57 AM   #2 (permalink)
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Re: Start. Then stall out ??

Sounds like you have air in the system. You might want to replace the return line and t's, they are known to cause air intrusion problems as well as the water separator. Did anyone drain it recently?
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Old 04-21-2007, 10:33 AM   #3 (permalink)
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Re: Start. Then stall out ??

How do you drain the system and what return line and t's are you speaking of???
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Old 04-21-2007, 10:51 AM   #4 (permalink)
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Re: Start. Then stall out ??

Water drain is a small ring by the brake booster. It is easy to find up against the fender. A 3/8" line runs down by the wheel well. Pull the ring and fuel/water comes out. I found mine leaked right away since it seldom was used. Many have said the valve does not seal well and they put a bolt in the hose for added protection.
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Old 04-21-2007, 11:42 AM   #5 (permalink)
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Re: Start. Then stall out ??

Return lines would be going between the injectors, plastic caps and rubber hoses.....called an injector kit

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Old 04-22-2007, 12:47 PM   #6 (permalink)
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Re: Start. Then stall out ??

So the injector pump is not the problem.
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Old 04-22-2007, 09:11 PM   #7 (permalink)
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Re: Start. Then stall out ??

I just went thorugh what you are having, get yourself a injector installation hit and replace the caps, o rings and hose.
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Old 04-23-2007, 12:21 AM   #8 (permalink)
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Re: Start. Then stall out ??

I had similiar symptoms in the past. Would start, run for about 2-5 minutes then die. After sitting for awhile it would start and do the same thing again. My injector pump went south. I could clean out the check valve on the IP and get about 20 miles worth of run time. Ran fine on the flats, only 5 MPH up a grade with a tail wind!!!! [img]/ubbthreads/images/graemlins/smirk.gif[/img] Hope yours is something easier/cheaper as above. The day before my IP died the engine ran a little noisier, had a surge of new power, then acted as above.
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Old 04-23-2007, 06:09 AM   #9 (permalink)
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Re: Start. Then stall out ??

The truck surges when it starts for the 2nd time for a little while then runs fine. Starts OK when re start on the road.
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Old 04-23-2007, 11:32 AM   #10 (permalink)
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Re: Start. Then stall out ??

where is the check valve located? my fuel system seems to fill with air after 1 out of 10 startups, I take out the air at the fuel filter and it seems to be fine until the next episode. I have replaced the injector return lines.
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Old 04-23-2007, 02:45 PM   #11 (permalink)
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Re: Start. Then stall out ??

Does the hose run down the wheel well and out the bottom of the truck on the driver side. I have a hose hanging down under there that leaking fuel. Is this hose what the bolt goes into. The truck is running worst now.
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Old 04-23-2007, 03:43 PM   #12 (permalink)
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Re: Start. Then stall out ??

Thats the fuel/water seperator. Try sticking a bolt in the end of the hose...
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Old 04-23-2007, 09:28 PM   #13 (permalink)
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Re: Start. Then stall out ??

I had an '85 that I had to troubleshoot the same problem. Even cold, it would fire right off the first hit of the day, only to quit after 1 or 2 seconds. If I would grind on it for a few seconds it would reprime and fire off. Started perfect the rest of the day until the next morning. After a Ford dealer changed the glow plugs (after I had told them not too) I still had the same problem (They changed all 9 of them??????) Next the said it was my injectors, they change them all, I asked "even the new one I put in last month" response "uh, yea", then the truck ran like crap. They put my injector pump timing back to stock. After about a month of this crap, and yes, changing the water seperator, I ended up puting a brand new $29 lift pump on the motor. The check valve had been leaking back. The truck would fire on the fuel in the injector pump, then get a charge of air. After cranking it for a few seconds, it would reprime and run fine.

P.S. we found over the years that Autolite glow plugs were the best, and there are two different sets out there. 6 amp, and 12 amp. Take a 15 amp batt charger and hook them up. The meter will show either 6 or 12 amps, the 12's will glow red much faster.
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Old 04-23-2007, 10:54 PM   #14 (permalink)
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Re: Start. Then stall out ??

[ QUOTE ]
(They changed all 9 of them??????)

[/ QUOTE ]

Where did you get the extra cylinder?

[ QUOTE ]
P.S. we found over the years that Autolite glow plugs were the best, and there are two different sets out there. 6 amp, and 12 amp.

[/ QUOTE ]

Fair warning...saying Au****te on here is about the same as swearing. [img]/ubbthreads/images/graemlins/blush.gif[/img] From general experience, the Beru/Motorcraft GP's are about the only ones that hold up. The Au****te's tend to swell and break off creating a whole new set of problems. Most of the guys one here would warn you away from Au****te GP's.
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'85 Bronco swapped up to a 302 4bbl from the 300 I6, NP435 4spd, NP208, 32x11.50x15 Radial RVT's, Soon to be 6.9 turbo powered.

86 F350 Cab&Chassis with a dump bed. 2wd 6.9 and 4 spd tranny. No mods to engine.

2000 Volvo 660 N14 Cummins, 500hp 1650 ft lbs, Autoshift tranny 10spd.

What part of "SHALL NOT INFRINGE" do you NOT understand?
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Old 04-23-2007, 11:49 PM   #15 (permalink)
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Re: Start. Then stall out ??

What is the lift pump and where is it location.?? Also it look like I have a vacum resavoir that looks like a tin can that has some rust and holes in it. This also has 3/8 hose attached going somewhere????

Diesels are Greek to me HELP!!
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