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Author Topic: 6.9l idi ford DB2 IP issue  (Read 14475 times)

July 07, 2013, 04:37:10 pm

wdkingery

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6.9l idi ford DB2 IP issue
« on: July 07, 2013, 04:37:10 pm »
My brother has a 1986 Ford f250 with a 6.9l idi IH motor in it. the previous owner installed a banks turbo, some gauges and a shift kit in the auto trans.

my brother dislikes driving and owning it, but I won't let him get rid of it, so it just sits.

well i have been out of the country as of late, and now that i'm back, i decided to fire it up and take it for a spin. boy i loved how it cranked right up after 6+ months of sitting!

well, drove it for about 20 minutes, was idling past the front door of a walmart and it just shut off. i mean plain conked out. this truck has never done this before! no, i don't abuse this one with motor oils, etc.

well, the only way it would fire up is if i gave it some skinny pedal. so i got it running, and now it idles on it's own, starts fine, etc. but something is wrong. it's like the gas pedal wont' push far enough; i cannot get boost to build very well, it won't stretch it's shifts on out like it should when floored.. but i checked the accelerator cable it's fine.

wonder what happened to that pump?? i suspected water in the fuel.. i've since checked the fuel i found in the filter, didn't find water.. added some iso-heet to the tanks.

anyone got an idea about why it just won't go? you almost have to floor it to accelerate normally, and this truck, with it's aftermarket turbo and IP turned all the way up used to zip right along 20 seconds before the walmart fall out.

i don't know enough about the 2 vacuum lines and the electrical bits on the IP. 



Reply #1July 07, 2013, 07:49:34 pm

vanbcguy

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Re: Re: 6.9l idi ford DB2 IP issue
« Reply #1 on: July 07, 2013, 07:49:34 pm »
A clogged fuel filter would definitely do that. I'd start with a fresh filter and go from there.

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Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Reply #2July 07, 2013, 07:52:00 pm

jboogie13

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Re: 6.9l idi ford DB2 IP issue
« Reply #2 on: July 07, 2013, 07:52:00 pm »
Diesel purge the pump just for good measure, friend of mine has a 7.3 IDI, those trucks are awesome.

Reply #3July 07, 2013, 11:16:29 pm

mzak88

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Re: 6.9l idi ford DB2 IP issue
« Reply #3 on: July 07, 2013, 11:16:29 pm »
The factory water separator has to go, if it hasn't already. They always leak air into fuel system, being on the vacuum side. Stanadyne FM 100 is awesome. Consider an electric lift pump at the tank(s).
97 IDI Jetta, O2A CTN,0.658 5th, 1.6 boost pin, TDI IC, 2.0 brakes, some tuning.

Reply #4July 07, 2013, 11:23:16 pm

wdkingery

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Re: 6.9l idi ford DB2 IP issue
« Reply #4 on: July 07, 2013, 11:23:16 pm »
I am afraid that removing the water separator is what got me in this situation.. Cause I never replaced it with anything! The owner was supposed to get a screw one type with a separator as part of it.

I think something inside the pump has snapped. It runs just great. Idles fine. Just has no power. Basically have to floor it, isn't making any egt, won't really produce any boost. I mean it will make a pound or 2 when you really wring it out but.. It's like I'm not pushing the pedal hard enough. I just don't know what's inside the pump to know

Reply #5July 08, 2013, 08:05:02 am

jboogie13

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Re: 6.9l idi ford DB2 IP issue
« Reply #5 on: July 08, 2013, 08:05:02 am »
If i remember correctly, the pumps for those trucks are relatively inexpensive compared to the VW pumps. Hopefully it doesn't come to that, but if it does you can keep your legs and just sell an arm  ;D

Reply #6July 08, 2013, 08:39:27 am

theman53

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Re: 6.9l idi ford DB2 IP issue
« Reply #6 on: July 08, 2013, 08:39:27 am »
are those the ones that the IP runs off oil pressure? If so and you have an oil leak at the back of the engine that could be it too. I would do the simple filter and the other stuff suggested too.

Reply #7July 08, 2013, 11:22:57 am

vanbcguy

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Re: Re: 6.9l idi ford DB2 IP issue
« Reply #7 on: July 08, 2013, 11:22:57 am »
Low/no power and low boost on a diesel means not enough fuel. If it is running at all I'd be shocked to find the cause was something physically broken in the pump. Fuel starvation on the other hand....

Rule out the simple stuff before going off the deep end!

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Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Reply #8July 08, 2013, 12:04:02 pm

jboogie13

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Re: 6.9l idi ford DB2 IP issue
« Reply #8 on: July 08, 2013, 12:04:02 pm »
are those the ones that the IP runs off oil pressure? If so and you have an oil leak at the back of the engine that could be it too. I would do the simple filter and the other stuff suggested too.
No, the powerstrokes (DI) use the oil pressure to control injection. The Ip is still a rotary pump but is lower pressure because the final pressurization of fuel happens at the injector. It's a pretty neat process IMO.

Reply #9July 08, 2013, 12:50:12 pm

mzak88

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Re: 6.9l idi ford DB2 IP issue
« Reply #9 on: July 08, 2013, 12:50:12 pm »
Get a stanadyne or racor water separator/filter head. Cheap insurance regardless. You can get them both with integral priming pumps, water bowls, heaters etc. even an electric lift pump built in on the Stan.
97 IDI Jetta, O2A CTN,0.658 5th, 1.6 boost pin, TDI IC, 2.0 brakes, some tuning.

Reply #10July 15, 2013, 02:42:13 pm

burn_your_money

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Re: 6.9l idi ford DB2 IP issue
« Reply #10 on: July 15, 2013, 02:42:13 pm »
I'd imagine that the stock lift pump failed. It's bolted onto the block I think on the drivers side. Check the oil to see if it's diluted with fuel.

You can check the fuel pressure at the fuel filter. There is a fitting on the filter housing for checking the pressure. You will kill the IP if you run it without the lift pump, it is not capable of pulling fuel on it's own from the tank.

Worst comes to worst, sell me the turbo goodies, my 84 is a bit slow :)

It's been a while since I had any of these pumps apart but I'm doubtful that something is broken inside the pump.
Tyler

Reply #11July 15, 2013, 02:49:26 pm

wdkingery

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Re: 6.9l idi ford DB2 IP issue
« Reply #11 on: July 15, 2013, 02:49:26 pm »
yes i'm a bloomin freekin idiot, as it's likely that is what's wrong with it, and so what do i do? assume it's bad fuel, and go run it for 4 or 5 gallons. hopefully i have not managed to damage the IP this way. idiot.  but i just put a quality chinese autozone lift pump on this thing not long ago.. less than a year

« Last Edit: July 15, 2013, 02:54:59 pm by wdkingery »

Reply #12July 15, 2013, 03:52:39 pm

745 turbogreasel

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Re: 6.9l idi ford DB2 IP issue
« Reply #12 on: July 15, 2013, 03:52:39 pm »
The tank sending unit and switch valves  both can cause problems too, as well as rats  occasionally get a taste for the nylon fuel hose.

Reply #13July 24, 2013, 06:52:20 pm

wdkingery

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Re: 6.9l idi ford DB2 IP issue
« Reply #13 on: July 24, 2013, 06:52:20 pm »
Check the oil to see if it's diluted with fuel.

it doesn't appear to be :(

You can check the fuel pressure at the fuel filter. There is a fitting on the filter housing for checking the pressure.

it appears that the lift pump is ok sadly.. i pushed the bike tire fitting in on the side of the filter housing, and it pissed fuel, and the truck didn't even miss a beat.. so it seems the lift pump is bringing up fuel. damn. do you have any more thoughts? i really thought i was going to go fix this..


Reply #14July 25, 2013, 06:35:01 pm

burn_your_money

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Re: 6.9l idi ford DB2 IP issue
« Reply #14 on: July 25, 2013, 06:35:01 pm »
It's a pain but you might try a local fuel shop to see if they will bench test your pump. Maybe something did let go. I can't picture the insides of the pump anymore though...
Tyler