What other cause could there be?
Here's my experience...
It was obvious I needed to replace my injectors. Uneven running was one symptom. Hard lope from the injectors unevenly applying. And it was getting worse. To the point where it almost seemed like some cylinders were battling each other.
But... No smoke. Not even at startup. None on hard acceleration. Etc. I had plenty of smoke when I first got it, but had eliminated the problem by adjusting the IP timing.
~~~
So... I replaced the injectors with some from one of the approved vendors here.
No more lope. (Except on a cold morning, when I have to use the GPs for a longer time. I am assuming that means I need to replace the GPs, because some must not be working.)
But, now I have tons of smoke at startup.
No long cranking times. It starts up pretty quickly.
I have adjusted the timing, in both directions. Result in both directions was worse smoke, and bad running. So my timing is now set back at what is obviously the best for this engine. (No idea what that is, because I don't have any of the timing equipment.)
Smokes only at startup, and up until it is well warmed up. After that, no smoke at all. Not even on hard acceleration. Acceleration is smoother and stronger with the new injectors. Better throttle response. Better hill climbs. It just runs better overall, with the new injectors.
Still... That is a LOT of smoke at startup. The entire neighborhood gets a blanket of white smoke...
I trust these injectors. I trust the vendor. So I am trying to figure out what else could be the cause.
One thing I am considering trying, is unplugging the fast idle at startup. The weather is warm. It's the best time to try such a thing. I suspect it isn't going to make any difference. (Or simply won't stay running on it's own.) But we'll see.
Selahdoor,
Let’s discuss some possibilities.
Problem - Smoke at cold start only.
Questions -
a) Did the smoke start the next day or within a few days of adding new injectors? If not how long?
b) How many seconds does it crank before it fires? With new injectors you may be dumping more diesel till it fires.
1) You could have a bad valve guide seal, oil pools at night and sucks in slowly burns till the motor is up to temp.
2) You could have 2-4 bad glow plugs and a couple of your weaker cylinders are not firing 100% till things warm up. Use a test light on the tip of each injector. Hook the pig tail to positive on the battery. Touch each tip, lights up glow plug is working to some extent. No light glow plug is dead.
3) Your timing advance is -
a) Over advancing because your timing is off already. But to your point why did it not improve when moving the IP?
b) Maybe it was not working prior and after you bumped it or the wiring doing the injectors it is now working. Thus changing the timing at start up. You could disconnect at the IP and start cold to see if anything improves.
4) Your cdr valve is not working or you have a lot of blowby when the motor is cold. You could test blow-by before and after warming up. You could clean and test your CDR valve to insure it is working. Star the engine cold without the cdr valve to confirm it is not your issue.
5) Not as likely but you have a head gasket issue. Warms up, engine or head expands and the problem goes away.
6) But as I say frequently do not assume you get a working part new or rebuilt out of the box. I know we want to think our favorite vendors are 100% every-time, but your symptoms line up with injectors since this was not happening before. Our favorite rebuilders will have a small failure rate too. That is why I asked if this appeared when you replaced them. Maybe the rebuild parts they got were bad out of the box. One issue is they likely only pop test these a couple of times and ship, but they do not run them in a engine to test.(No one does, they would come all sooted up.)
Here is what makes them great to work with. They all have a great track record. They all will work with you to resolve the issue. If within a week of replacing your injectors you got smoke clouds and 6 or more glow plugs are good, and your engine cranks for say less that 10 seconds that would be a big puff of smoke but then clear right up.
So to be fair to the vendor, rule out the glow plugs, IP advance, and the cdr. Then talk with the vendor and have a conversation, I am sure they will help make you a satisfied customer.