Hard Start Cold - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 9 (permalink) Old 11-02-2018, 07:29 PM Thread Starter
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Hard Start Cold

1987 F250 C6 with aftermarket Banks Turbo

Been chasing this issue for a long time. Starts fine when recently ran and warm. In the morning she turns over with no sign of starting for 15 seconds. Then I let it chill for a bit. Then turn it over and around 10 seconds she will start and run fine. And there is a puff of white smoke out the tailpipe.

Yes, I know this points to the GP system being the issue.

Things I know:

GP side of the story:

Glowplugs are Motorcraft and pass the Ohm meter test. I pulled all 8 and individually tested.
GP wiring harness has new bullet connectors and passes the ohm test from Bullet connectors to the GPC. No resistance.
GPC has 12v constant power and the smaller post has over 8 volts.
GPC has 10v on the GP harness side at the post when cycling the GPs.
The WTS light and volt meter match each other and I hear a bunch of clicking (probably 8 clicks never counted) when it goes out.

Fuel supply and return side of the story:

New fuel line everywhere
Eliminated the Fuel Switch Valve and only using the front tank
New pickup in front tank
Clear hose running into the manual lift pump
Clear hose running up to the fuel filter
No air bubbles or bleed down over night
Full Fuel filter in the morning
New Injection Pump
New Injectors
I believe i have it timed now

***The return line on coming off the IP never fills with fuel and will drain down shortly after turning the truck off. Could this be my issue?

The truck drives great when running.

Please help

Dave
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1987 F250 4x4, c6, 6.9l idi, non-turbo, 150k
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post #2 of 9 (permalink) Old 11-02-2018, 08:18 PM
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Re: Hard Start Cold

how long does the WTS light stay on when cold?
did you check for voltage at glow plugs when key is turned on cold with WTS light on?
it sounds to me like the glow plug relay may be bad.

tom
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post #3 of 9 (permalink) Old 11-02-2018, 08:20 PM
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Re: Hard Start Cold

i doubt it is a fuel problem because the fuel filter is full in the AM.
if it was an air intrusion, the filter would be partly empty.

tom
owner of almost to many fords.



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post #4 of 9 (permalink) Old 11-02-2018, 08:25 PM Thread Starter
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Re: Hard Start Cold

Thanks for the reply.

I checked the #1 GP voltage and got something like 9.4 volts.

I have a receipt from the PO and there is a new GPC from O'Rielys

Be well

edit: Forgot to say that it stays like for a 10 count and it is around 40deg F in the morning

1987 F250 4x4, c6, 6.9l idi, non-turbo, 150k
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post #5 of 9 (permalink) Old 11-02-2018, 08:29 PM Thread Starter
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Re: Hard Start Cold

Also, the voltage on the GP side of the relay slowly climbs to 10volts and is only at 10v for a short bit till the clicking starts and WTS turns off. Once the WTS light is off the voltage starts jumping all over the place (remaining below 10v) eventually dropping to zero after the clicking has stopped.

1987 F250 4x4, c6, 6.9l idi, non-turbo, 150k
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post #6 of 9 (permalink) Old 11-02-2018, 09:33 PM
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Re: Hard Start Cold

glow plugs should stay on for closer to 15 seconds at 40 degrees. 9.4 volts at the glow plugs sounds about rite. remember, these draw a lot of current through a small wire.
i would check for voltage at all the glow plugs, 10 seconds sounds like you have one or two glow plugs not working. the harness may have an issue and not sending power to all the glow plugs.

the clicking of the controller is a feature designed into it to keep the glow plugs semi lit to help the engine stay running on cold start.

tom
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post #7 of 9 (permalink) Old 05-24-2019, 12:24 PM
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Re: Hard Start Cold

Quote:
Originally Posted by davidtown View Post
1987 F250 C6 with aftermarket Banks Turbo

Been chasing this issue for a long time. Starts fine when recently ran and warm. In the morning she turns over with no sign of starting for 15 seconds. Then I let it chill for a bit. Then turn it over and around 10 seconds she will start and run fine. And there is a puff of white smoke out the tailpipe.

Yes, I know this points to the GP system being the issue.

Things I know:

GP side of the story:

Glowplugs are Motorcraft and pass the Ohm meter test. I pulled all 8 and individually tested.
GP wiring harness has new bullet connectors and passes the ohm test from Bullet connectors to the GPC. No resistance.
GPC has 12v constant power and the smaller post has over 8 volts.
GPC has 10v on the GP harness side at the post when cycling the GPs.
The WTS light and volt meter match each other and I hear a bunch of clicking (probably 8 clicks never counted) when it goes out.

Fuel supply and return side of the story:

New fuel line everywhere
Eliminated the Fuel Switch Valve and only using the front tank
New pickup in front tank
Clear hose running into the manual lift pump
Clear hose running up to the fuel filter
No air bubbles or bleed down over night
Full Fuel filter in the morning
New Injection Pump
New Injectors
I believe i have it timed now

***The return line on coming off the IP never fills with fuel and will drain down shortly after turning the truck off. Could this be my issue?

The truck drives great when running.

Please help

Dave
I had a VERY similar problem with my 2000 7.3L F250. Tried several things but it was finally cured by, wait for it...changing the fuel filter. It was like magic! she started right up in cold weather after I replaced the fuel filter. I didn't see in you post where you had tried this. It's a cheap fix if it works for you. I didn't think my filter was that old but it cured my starting problem. Good luck.
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post #8 of 9 (permalink) Old 05-24-2019, 06:11 PM
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Re: Hard Start Cold

two completely different animals. comparing an 87 6.9 to a 2000 7.3 is about the same as comparing a lawn mower to a race car
the only thing the two engines have in common is they burn diesel fuel.

tom
owner of almost to many fords.



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post #9 of 9 (permalink) Old 05-24-2019, 08:35 PM
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Re: Hard Start Cold

From what I'm reading, I would say that you're right about it pointing to the gp system. Even though the relay passed the ohm test, it could still be bad. The inside of that relay (for simplicity sake) is like two aluminum pie plates touching bottoms. Over time with the opening and closing under load and the arcing this causes they will pit and point the contacts. If your contacts have developed a point or several points, it will pass the ohm test but wont allow enough current to pass through to heat the glow plugs sufficiently, thus the puff of white smoke and the start after an extended period of time. The white smoke makes me think you're getting fuel so the problem points back to the gp's. That's just my way of thinking but I don't have near as much experience with the powerstrokes as the majority of folks in here, but I do have about 25 years in the industrial electrical and automation field. Hope this helps

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