So when the truck is cold, maybe 40 degrees and below, when I accelerate past about half throttle in 3rd, 4th, and 5th, it almost seems like the truck is missing. Once the truck warms up and the needle is around the first or second mark, it doesnt happen anymore. When the truck "surges" the boost wont go past about 25 # of boost in 5th, and usually i push 35 # without pushin totally hard. Could it be somethin with my timing being advanced?

 

I hope Pastor Bob will jump in here and correct me if I'm wrong but, you are running POD injectors and they don't atomize fuel like other injectors do. I'm thinking it is just a low cylinder temp issue. I used to run PODs and mine would run lousey until it got warm also.

Bob? Input please!!

Dave

 

What color smoke are you getting (if any) when it runs bad? If the POD's are drowning the fire, you'll see white smoke from the low combustion temps.

 

Im not sure what color smoke is comin out when this happens. If it is the POD's killing the fire, would backing off the fuel for the cold weather help out?

 

Try changing the fuel filter and checking your fuel pressure. Sounds like she is leaning out on you (which retards the timing on the VE) when the fuel is cold. Also, check that your KSB is working properly -- though that would really only cause hard starting with white smoke at start-up.

If it were really associated with the POD's and cylindar temps, I would expect it to run poorly at low accelerator positions as well. Could be wrong, though.

Good luck,

Alec

 

I think one of the toughest things to do is "remote diagnostics"...
That's why it's really best if there is as much info/symptoms/oddities etc provided in sequence included with the question...
Generally your sypmtoms suggest a fuel issue. Whether it's injection pump, injector(s), lift pump, poor fuel, plugged filter, malfunctioning guide pin etc...

I'd make sure the fuel filter is free of water/dirt etc.. how long since it was replaced?? The air filter is one thing to give a quick look over too as well....
Next I'd make sure that the KSB solenoid spade connector is good and tight along with the fuel solenoid. I know, engine temp shouldn't really cause this set of syptoms but check them anyway, that way they can be ruled out as a possible contributing factor..
On your pump/truck the KSB is a wax filled unit. It may be malfunctioning, forcing you to start and run without initial KSB advance.
After that, I'm wondering if the fuel guide pin is a bit sticky till the fuel warms up and softens the o-ring around it...????
Depending on how you do your warm-up and drive habits I'd also wonder if the fuel heater and/or the manifold heaters are/are not cycling properly.
Have you run a good double dose of fuel additive thru the pump/engine??? If not, do that as well... again to help eliminated the possibility of dirty fuel lines/injection pump/delivery valves/fuel lines/injectors.
As a matter of fact if you are going to change your fuel filter, then half fill it with additive and half with fuel before installing it.
Check and snug up any turbo boot clamps.
Timing will cause or cure smoke issues... white and/or bluish smoke is retarded timing, and or poor fuel.

From here, we could use a bit more detail on your situation... what if any smoke/color, is the miss confined to a certain RPM range when cold or generally across the band??
Do you see these symptoms at ANY other time?? Did this start with a recent fill up of fuel?? etc etc...

Bob.

 

Bob,
Thanks so much for taking the time to type up such a long response! It means alot! Lets see, as far as smoke I havent noticed anything excessive when the symptom occurs. I will make sure to take a closer look tomorrow morning. It only has begun to occur as temperatures in the morning drop below about 40 degrees, but I believe my grid heaters are functioning properly (I can see the lights dim when they kick on and off). I couldnt really tell you a RPM range cause I dont have a tach, but i notice it really when I build up about 20 or more pounds of boost. I myself believe that it is either my POD's are drowning the fire before the cylinder temps get to a good operating range, or that, as you mentioned, the KSB isnt working properly. I knew this part exhisted but never knew what it was called until now. What exactly do you mean by running a double dose of treatment through? Should I run more through than they recommend? I didnt know if this would be harmful to the pump or injectors. I use it every couple of tanks, so it does see it regularly. To further describe what I feel, it is almost a surging of sorts that pulses very harsh. There is no missing it, and the severity it feels like inside makes me feel like other people can probably see it too. Thanks again for all the help!
Brian

 

If its surging with boost, then I would suspect the AFC pin may be sticking in the bore or as Bushy said the fuel pin that runs on the AFC is sticky.

On my 89 I had some bad grease on the AFC pin that made it sorta choppy, not as much as you describe. Pulled it and cleaned the bore and the pin, used some lithium grease and it was smooth sailing. ???

J-eh

 

Yup I agree with the above remarks,... check out those items next.
As for the POD's putting out the fire..... naaaaaaa.... I run mine up here in Canada, and even though it's on the west coast we get some cool weather here. I have never had the problem you descibe and you can bet big that I have a much more aggressive pump setup than you do, including the POD's...that just ain't right....

eh.... ;D

Pastor Bob.

 

Ran it with the back window this morning, and with my stacks I can hear everything very clearly. It nearly sounded like it was missing?? Any new ideas now? Or should I still check the other stuff....I would have sooner but its been crazy, traveling to family's houses for Turkey, falling asleep infront of the tv, and getting back to bed. Im lucky I had time just to wash it! Thanks again!
Brian

 

I have PODs in my 92, I have had no problem like that with mine. I have left the house recently at 20 degrees out. I do let mine warm up a bit before I go. My temp gauge wont even read near the normal range just idling in the drive. I have to take off just to build some heat in the engine. ;D

 

If it sounds like its missing, I would suspect timing and/or the lift pump/fuel filter system. Maybe air too.. :- You are not getting good injection to the cylinder or enough heat from compression to fire the charge.

J-eh

 

I was wondering if after crawling around under the hood, if a line wasn't leaking air somewhere?

 

But the weird part about it is it only occurs when the engine is cold. Once it warms up there is no sign of it at all, it runs amazing. I've thought about replacing the lift pump recently, is there any good signs of how to diagnose if the pump is not working properly, or is it worth it to just replace it with almost 150,000 on it. Thanks again for all the responses,
Brian