Cold starting with DPS injectors.

[Sycostang67]

I was wondering if this was happening to anyone else running the DPS stage one sticks. I assume it is related to the spray(****) pattern that they have. During cold(freezing temps) starts, I get lots of white smoke, usually for a solid minute. I am pretty sure I am suffocating the trees I park next to at work when I leave every evening. I had the same problem with my last set of regular injectors, but two of them were stuck open so I attributed the smoke to that. The original injectors I had though, I would get one puff and then clear. The GP system is fine, the controller and plugs were new last spring. I just figure with the spray pattern of these units, it's harder to burn the fuel until the motor is warmer, as the smoke does clear up after a minute or so. If I start the truck with the block heater plugged in I get no smoke at all.

 

[justinray]

Ken's injectors are trash, but may make a decent core.

 

[icanfixall]

Sadly I feel the smoke issue is the injecters. Cores... Maybe but probably not...

 

[kc0stp]

Beyond the fact that anything DPS is junk (when new) you might also check the timing, off far enough it causes hard cold starts with possible smoke.

 

[Sycostang67]

It's not hard to start, it fires off after one cycle of the plugs. The quantity of smoke is just more than I am used too. I have tried it with the cold timing advance disconnected and it was the same .

 

['94IDITurbo7.3]

is it smoke or does it look more like the "steam" a gasser puts out when it is cold outside. when my truck is cold and the temps are cold mine will "steam" until it warms up.

 

[Hydro-idi]

is it smoke or does it look more like the "steam" a gasser puts out when it is cold outside. when my truck is cold and the temps are cold mine will "steam" until it warms up.

Good point. But if that exhaust sticks around longer in the air, then it is likely to be un-burnt diesel fuel. The "steam" exhaust will dissipate fairly quickly and is common during cold mornings. Although more common with gas engines, it does happen with diesels. It does sound like there is something going on with the injectors especially if your engine is in good shape and your glowplug system is working properly. Typically during cold mornings at first startup, my engine will puff out a little smoke for about a second then blow clear exhaust after that. I would get your injectors pop tested. It sounds like you have a few leakers.

 

[turbo elk]

Which way would you turn the timing to give better cold starts, advanced or retarded?

 

[SLC97SR5]

Which way would you turn the timing to give better cold starts, advanced or retarded?

Advancing the timing will give easier cold starts, hence the cold advance solenoid internal to the IP.

 

[Hydro-idi]

Advancing the timing will give easier cold starts, hence the cold advance solenoid internal to the IP.

Too much advanced timing will not give a diesel engine an easier cold start. Instead, advanced timing will warm a cold engine faster. Actually, a slightly retarded timed engine will be a bit easier to start but may take longer to warm up and may experience less overall power.

 

[hesutton]

Speaking from my own personal experience with DPS injectors on my truck......... get rid of them. They are a hindrence to your truck, not a help. Pop test them and see the "quality" Ken sells to people. They will leak (likely all of them), they will have pop pressures that are lower than they should be and no where near to each other, and they will have zero atomization/crappy pattern.

None of those "qualities" equal a smooth, efficient, balanced, or powerful diesel engine.

Heath

 

[SLC97SR5]

Too much advanced timing will not give a diesel engine an easier cold start. Instead, advanced timing will warm a cold engine faster. Actually, a slightly retarded timed engine will be a bit easier to start but may take longer to warm up and may experience less overall power.

Obviously too much timing either way is a bad thing, however, if I unplug my cold advance solenoid on the -5*f days it will not start. It is not just to help it warm up faster.

 

[icanfixall]

Contact Conestoga Diesel Injection located in Pa. They can and will sell you a set of injecters that are the best for what yout engine needs.

 

[Sycostang67]

It is definitely fuel smoke, you can smell it. I think one of them may be leaking a little, but they are still better than the BB codes I replaced. Two of them would open and not close at all until pressure dropped below 300psi.

At least our inversion has ended, it was 34* when I left work today so practically no smoke.