Rough idle on startup - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 10 (permalink) Old 09-14-2007, 08:07 PM Thread Starter
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Rough idle on startup

It has been about 6 weeks since I installed the Stealth twins and ever since, it idles rough when I start it in the morning. It only lasts for about a minute then idles normally thereafter. I understood this to be "normal" at first since there will be air in the HPOP lines that needs worked out but now its 6 weeks and about 600 miles later..

2002 Ford F350 Crewcab 4X4 SRW, Twin turbos
820 HP on 05/19/12

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post #2 of 10 (permalink) Old 09-14-2007, 08:25 PM
 
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Re: Rough idle on startup

It's something that happens with certain trucks and big oil.

thehammer69 is going to add a melling HV oil pump and see if it goes away. May be a weak LPOP.
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post #3 of 10 (permalink) Old 09-14-2007, 10:27 PM Thread Starter
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Re: Rough idle on startup

Ya my thoughts were a weak LPOP too.. It runs great once she's warmed up but just the first minute it shakes and runs rough.

2002 Ford F350 Crewcab 4X4 SRW, Twin turbos
820 HP on 05/19/12

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post #4 of 10 (permalink) Old 09-15-2007, 01:31 AM
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Re: Rough idle on startup

100% chance that you have NO..... low pressure oil when you crank, and for some time afterward. lol.

I have a lube oil gauge on my truck zip-tied to the antenna and it reads from the top of the reservoir. When I crank the truck it has air for about 20 or 30 seconds before it settles into a nice smooth idle. FWIW, if you'll let it always sti still until it gets smooth before taking off, you will enjoy a much crisper engine while you drive as it woln't just FILL the oil with air and be so hard to work back out.

When mine cranks (brand new lpop too) it will:

Craank, Whack, fires up.......1/1000.....2/1000....3/1000.....4/1000.... then maybe a flicker....5/1000 then 5lbs or so flickering up....6/1000 maybe jump up to 10-15 and maybe drop back to 8ish, then ZING.....up to 40lbs with some jitteryness (this is after 5 or so seconds with NO lube oil pressure). Then exactly when the truck begins to idle correctly again the lube oil gauge is steady as a rock.

I have a -10 pickup tube down the top of the reservoir all the way to the front cover too.

It's only slightly more sluggish to come up with the second charger.
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post #5 of 10 (permalink) Old 09-15-2007, 01:34 AM
 
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Re: Rough idle on startup

It's your donkey pump

JK

We have opposite issues. Mine will NOT start until the oil pres guage comes up and stays steady!
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post #6 of 10 (permalink) Old 09-15-2007, 03:48 AM Thread Starter
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Re: Rough idle on startup

So does it sound like my LPOP is shot?

Oh and hey Greg, that dang bug avatar is driving my cat crazy...

2002 Ford F350 Crewcab 4X4 SRW, Twin turbos
820 HP on 05/19/12

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post #7 of 10 (permalink) Old 09-15-2007, 04:45 AM
 
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Re: Rough idle on startup

A 3 stage belt pump with two -12 suction lines ought to solve any low oil PSI issues.
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post #8 of 10 (permalink) Old 09-16-2007, 04:02 PM
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Re: Rough idle on startup

Don't kid...

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post #9 of 10 (permalink) Old 09-16-2007, 04:09 PM
 
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Re: Rough idle on startup

Not kidding, I have a 3 stage pump that I just rebuilt that came off my boat. Wouldn't take much to build a couple brackets....
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post #10 of 10 (permalink) Old 09-16-2007, 04:12 PM
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Re: Rough idle on startup

Well since my fuel will be belt driven anyway.......you can bet that the next time my engine is out, the oil system will get the same treatment.
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