strong when cold, weak when hot

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strong when cold, weak when hot

Postby ellis93 » Sun Apr 25, 2010 11:21 am

the truck is a d250 5speed. From day one of my ownership of this truck the value of keepin up the rpms has been realized more than once. You just can't lug it. Put it in first and keep the Rs turnin while ur pullin or its a turd. If the trucks empty, no problem it does good. Now after owning it for several years I know my truck really well. The winter temps makes it smoke and run funny till she is hot enough to move the temp gauge. During the spring and summer she's fine no problems till now. Its got this thing were when cool, running for 10 or 15 min it rolls out fine and if keeped out on the hwy it does good. But if u run it and get in a stop and go traffic she will not take off. Kinda feels like your draggin an anchor behind you and pullin a trailor is worse. The timin bump is still there, but the h1c is back on it for now. Thanks for any info u may have. Gotta find what this is. I can't keep up with a 4 cyl S10 like this.
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: strong when cold, weak when hot

Postby ellis93 » Mon Apr 26, 2010 6:01 am

Not even a guess? I did for get one thing. In the mornin I build boost easy. Runnin 70 I have 8 to 10 pounds. By 1 in the afternoon I only run 2 to 3 pounds running the same speed.
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: strong when cold, weak when hot

Postby meby » Mon Apr 26, 2010 12:02 pm

Maybe a stab in the dark, but could be a fuel issue or lack thereof.
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Re: strong when cold, weak when hot

Postby 1STGENFARMBOY » Mon Apr 26, 2010 2:10 pm

have you checked the fuel pin and made shure it's movin, it does the boost think runnin either turbo?? might
have a rip in the afc rubber, it does sound like a fuel prob, filters, rubber line colapsing when hot, just stabs. :roll:
93 W250 STD CAB, AUTO 3.55, GAUGES, 80HP DDP STICKS, DENNY T ,16CM HOUSING, 60MM GILLETT, VE MAXED,BHAF, BHFF, 366 SPRING,P/S INTERCOOLER, TIMS COOLER TUBS, TIMMING 1/8 BUMP,4in TURBO BACK TO DUEL 5IN STACKS,33 12.50 BFG, HOLLEY BLACK, CONVERTER COOMING.
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Re: strong when cold, weak when hot

Postby ellis93 » Mon Apr 26, 2010 4:43 pm

With the hx35 I really didn't feel it as bad. Fuel pressure could be bad but I put a pump on it about two months ago when it was still cool outside that could be the prob. Ill stick a gauge on it and see.
As far as the fuel pin, I've never seen it. if the rubber is messed up were would one come up with one.
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: strong when cold, weak when hot

Postby KTA » Tue Apr 27, 2010 9:02 am

I will guess a leaky intercooler.
Fleet of Junk: 1989 D350 627rwhp 1300 tq B-1/Hx60 twins, KTA pump/injectors, ported head, BIG fuel supply. 13.75@ 109.5mph 1/4: 1992 W350 Cab-chasis, 1993 W350 ext cab cust.370 inj Hx40/16cm 290rwhp hydroboost brakes,1984 D350 crew-cab another project.
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Re: strong when cold, weak when hot

Postby dpuckett » Tue Apr 27, 2010 10:42 am

I was thinking a stuck AFC guide pin, broken AFC potmetal hose, or fuel supply issue (I've had new lift pumps struggle to put out 5psi).

KTA- why do you think a leaky intercooler? Unless it had a big hole in the side, and was getting NO air to the engine, I'd think EGTs would be about the only issue.

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Re: strong when cold, weak when hot

Postby KTA » Tue Apr 27, 2010 6:13 pm

As long as you still have a functional afc if you lose boost you lose fuel as well. Remeber that is what the AFC does! The intercoolers are aluminum, as it warms up it expands alot, if its cracked this opens the crack, and could be why he sees more boost cool under the same load than when its hot. Leaky intercoolers are known problems on these rigs as well.
Fleet of Junk: 1989 D350 627rwhp 1300 tq B-1/Hx60 twins, KTA pump/injectors, ported head, BIG fuel supply. 13.75@ 109.5mph 1/4: 1992 W350 Cab-chasis, 1993 W350 ext cab cust.370 inj Hx40/16cm 290rwhp hydroboost brakes,1984 D350 crew-cab another project.
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Re: strong when cold, weak when hot

Postby PToombs » Tue Apr 27, 2010 6:42 pm

I never knew my I/C was bad, until I hooked up the 4400# trailer with the 2000# tractor on it. Gave a whole new meaning to the word HOT! I knew instantly what the problem was, and drove it easy until I could pull it off and get one.
pete

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Re: strong when cold, weak when hot

Postby ellis93 » Tue Apr 27, 2010 7:24 pm

How would yall check for a leakin i/c. Only thing that crosses my mind would be to pull it out and look it over with some shop air on one side and some kind of plug in the other. Then how much air? 20 or 30 pounds. Wouldn't want to make a hole if there is not one.
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: strong when cold, weak when hot

Postby IowaCummins » Tue Apr 27, 2010 7:45 pm

can do you whole charge intake system with a type of plug or cap on your turbo intake and a schrader valve. i bet 25psi would be enough to show you your leaks. windex is great at bubbleing so thats what i would use
1993 Dodge W250 Reg cab. Auto, .010" headgasket, A1 Studs. Just the Lil Ole VE pump Fuelin 7x.014's turnin the Aurora 3000 turbo. 5" Turbo back to Duals. :cbadge:
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Re: strong when cold, weak when hot

Postby ellis93 » Wed Apr 28, 2010 6:34 am

Cool I will give it a shot. Also got an airtex replacement pump for a 24 valve coming. I've seen them hold 14 pounds at WOT on those motors should work for me. Or would it put to much fuel pressure to it. Think with just the fuel pump running it puts out nearly 21 pounds.
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: strong when cold, weak when hot

Postby The_Head » Wed Apr 28, 2010 8:17 pm

I think you need to regulate it to around 15 psi or you risk blowing out the front seal on the pump.
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Re: strong when cold, weak when hot

Postby ellis93 » Thu Apr 29, 2010 10:34 am

Don't want that to leak. Did check the pressure hot and cold and it was only 2 pounds hot. Think I'm startin there first. Then the i/c.
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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