reset injector pressures and caused another issue

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reset injector pressures and caused another issue

Postby DodgeFreak » Wed Jun 22, 2016 7:29 pm

So in my quest to bring ol blue up to snuff I decided I would pop test injectors and reset them close to 245 bar which ended up being 248 ish around 3600 psi. It lowered the rpm which I figured it might beings it would shorten the duration and retard timing a touch. (maybe I was wrong in my thinking and that it just happened for another) I drove it home and then back to work it was idling around 5-600 rpm according to my tach. Now to the problem

I fired it up to pull it in the shop and it fired right up but sputtered and blew white smoke like crazy and cleaned up. sounds like air in the system. I tried to fix a few things and found out my radiator has a crack (another story). Drove it home and fired it up again later today and it started right up but the more rpm the more it missed and blew white.

I'm assuming it's sucking air, will that reflect in the fuel pressure gauge, Will a diaphragm lift pump cause it to do that if its going bad but hold pressure running. I don't see any external leaks but haven't gotten around to looking at it to closely just yet. I'm planning on changing fuel filters and what not. Could the injection pump have been weak and now that it has to push more psi it can't handle it?? It runs fine down the road and once started is fine so I'm leaning towards air still. I'll pressurize the tank and check for leaks but just wondering what else to look for. I have another trip to Oklahoma planned for next Friday so I need to get this fixed asap. Thanks sorry its long winded.
92 D350 Cab and Chassis. Auto stock, wiring gremlins. 330k miles
92 W250 Ext cab rotted completely out. Auto, pump maxed, 215 ppump nozzles, Denny T2 pin.
85 D350 single wheel, converted to cummins, getrag, turned up 2 turns and afc screw flush.
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Re: reset injector pressures and caused another issue

Postby ellis93 » Thu Jun 23, 2016 4:54 am

Could be cold engine/combustion chamber and low timing as well. Once upon a time mine did that (granted ambient temps where 50/60*) and a fuzz more timing made it disappear.
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: reset injector pressures and caused another issue

Postby DodgeFreak » Thu Jun 23, 2016 11:08 pm

So I noticed when I advanced my pump (not even an 1\8 I don't think) my wire for the ksb was black so I crimped a new end on but my question is, when does the ksb activate?? I thought it was just when it was below a certain temp. well below the mid 70s- high 80s when it was acting up.
92 D350 Cab and Chassis. Auto stock, wiring gremlins. 330k miles
92 W250 Ext cab rotted completely out. Auto, pump maxed, 215 ppump nozzles, Denny T2 pin.
85 D350 single wheel, converted to cummins, getrag, turned up 2 turns and afc screw flush.
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Re: reset injector pressures and caused another issue

Postby ellis93 » Fri Jun 24, 2016 3:07 am

I don't have an answer to that. You could hook a jumper wire from the battery just to see if extra timing helps out.
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: reset injector pressures and caused another issue

Postby PToombs » Fri Jun 24, 2016 7:06 pm

DF, is the engine IC or non IC? Non IC is advanced with no power to the KSB, IC is advanced with power.
Sounds to me like retarded timing, but could be sucking air as well.
pete

Just enough power to break everything behind the crankshaft.
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Re: reset injector pressures and caused another issue

Postby DodgeFreak » Fri Jun 24, 2016 10:03 pm

It's ic. My timing was retarded. I advanced it and fixed the wire to the ksb and it hasn't done it.
92 D350 Cab and Chassis. Auto stock, wiring gremlins. 330k miles
92 W250 Ext cab rotted completely out. Auto, pump maxed, 215 ppump nozzles, Denny T2 pin.
85 D350 single wheel, converted to cummins, getrag, turned up 2 turns and afc screw flush.
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14mm rotor
 
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Location: Iowa
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Re: reset injector pressures and caused another issue

Postby PToombs » Sun Jun 26, 2016 8:15 am

Good deal, easy fix then!
pete

Just enough power to break everything behind the crankshaft.
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PToombs
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Re: reset injector pressures and caused another issue

Postby DodgeFreak » Sun Jun 26, 2016 4:54 pm

How much rattle is to much? I'm thinking about bumping it a touch more. It still smokes with low boost but it's a greyish smoke now. I think a touch more might clean it up.
92 D350 Cab and Chassis. Auto stock, wiring gremlins. 330k miles
92 W250 Ext cab rotted completely out. Auto, pump maxed, 215 ppump nozzles, Denny T2 pin.
85 D350 single wheel, converted to cummins, getrag, turned up 2 turns and afc screw flush.
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Joined: Sat May 15, 2010 8:14 pm
Location: Iowa
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Re: reset injector pressures and caused another issue

Postby PToombs » Sun Jun 26, 2016 4:57 pm

Hard to say. Stock is 1.25mm of lift (IIRC) on mine 1/8th bump was 1.65, and another 1/8th was 2.25mm. T 2.25 it rattled pretty good, and my head was oozing kinda bad in the front corner. I marked it and backed it off back to 1/8th. After redoing the head gasket I run at 1.85 and it sounds pretty good.
pete

Just enough power to break everything behind the crankshaft.
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Re: reset injector pressures and caused another issue

Postby DodgeFreak » Sun Jun 26, 2016 5:01 pm

I think I'll leave it lol.....I really don't want to blow a head gasket or anything before the trip. I'll just back the power down a touch or just deal with it.
92 D350 Cab and Chassis. Auto stock, wiring gremlins. 330k miles
92 W250 Ext cab rotted completely out. Auto, pump maxed, 215 ppump nozzles, Denny T2 pin.
85 D350 single wheel, converted to cummins, getrag, turned up 2 turns and afc screw flush.
User avatar
DodgeFreak
14mm rotor
 
Posts: 1701
Joined: Sat May 15, 2010 8:14 pm
Location: Iowa
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