Hi guys, I have had a bit of white smoke and a hesitation in my 12 Valve, with stock injectors it was just a bit of white and an almost undetectable hesitation or skip, with the addition of the 370 injectors there is a lot of white smoke on start up and a "MUCH" larger hesitation. Once the truck is warm it lessens to a degree, but never goes away. I have replaced the overflow valve, might have helped a bit, but not much. I have 22 lbs of pressure at idle and about 34-35 at rated RPM??

Any ideas as where to start? One other thing, I hear the "waterfall" in the morning after the truck sits overnight but no coolant on the ground or under the carpet. When I replaced the injectors all of them seemed "equally" carbon covered.

Thanks in advance.
Mc

 

If the timing has slipped and become too retarded, you will get some white smoke - especially at idle when cold.....have you checked the timing lately? Usually white smoke is unburned fuel that has vapourized in the exhaust manifold which is from incomplete/cold combustion.

 

By timing you mean injection pump timing? If so, no I have not-I need to buy the tools. Would timing have affected my HP a bit more?

 

id like to know the answer to this as imexperiencing a hesitation myself...but i have adifferent setup...before the gsks i had a hesitation or defuelign type of thing at about 2000rpms..now i have the hesitation at about 2300rpms after addign the gsks.....i think mine is because of the stock plate and the shape of it...i looked at the plate and it has a defuel "step" or tooth on it...i think maybe urs could be more pronounced after the 370's

or it could be delivery valves not keeping up or some timing too

 

I am hoping some of the "12 Valved experts" chime in, I have a freind who is good with these, but he is out of town.

 

Yes and yes......retarded timing will cause a hp loss, hesitations, white smoke and drivability issues and these P pumps have been known to slip out of adjustment......years back, there was even a TSB about it......it's also a good time to get the timing advanced!

 

Who makes the tools? I have seen the Snap - on set, Miller/SPX, and Cummins, does anyone else? Who has the best pricing?

 

McMopar, I have the tools and am in your backyard. No use them just sitting in my toolbox not getting used. PM me to get together sometime. I kinda want to check mine again, too. Might be a good excuse to do some shop time.

 

Redram,

Check your PM's

 

My father told me his '96 D2500 CTD ATX dies when cold.
Anyone have a link to said TSB?
He's thinking about taking it to a dealer or Cummins, but all they'll do is replace a bunch of expensive stuff and not fix the problem.
Is this vehicle OBD II compliant? IOW, can I pull 'codes' off it like mogas vehicles?

Thanxs!

 

If it dies when cold I would bet that the idle is set too low. Simple thing to set if you can contort your hands under the back of the injection pump with a 10mm wrench.

As for codes, the motor is pretty much self-contained - about the only thing that sends signals to the black box is the crank sensor for RPMs and the TPS for throttle position. Being a 12-valve the pump is all mechanical so there is no electronic control or feedback required.

You can have the codes pulled but don't expect a whole lot of information from them.

 

I know Masonic-Dodge has the tools... I gained ~20RWHP when Tim advanced my timing to 16.5*, it had slipped to 10-11*.

 

Eskimo,

What symptoms did you have?

 

Thanks for the wrench size tip.
My dad's 70 and in the hospital, so his truck is not readily available to look under the hood for the idle speed. Will it be posted there? I could just turn it up a bit from what it is.
I'll put my OBD II logger on it if it has a port, just for fun.

It's a slushbox (he had a bad knee and couldn't work the clutch anymore) so I hope I'm not pulling that out soon, too. Is it at all like the 727's?

Thanks again.

 

Your dad has a 47RE, which has ome electronic controls (converter lockup and OD) the front half is very similar to a 727.