I too am curious about the CDR valve. My intake looks terrible.
CK5
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1983 6.2L Black smoke at low rpm and load
- Thread starter Truckman4life
- Start date
I wonder how much today's diesel fuel effects the way the old motors run. Do run an additive?
I've been told an additive helps with a lot of things. I've had a couple of my shops tell me the run a bottle in every tank. I don't have the attention span to do that, nor the wallet.
The fast idle solenoid should physically touch and move the throttle linkage. If it's not touching, it's not doing its job. It might be that it's adjusted too low or that the warm idle is too high, but there should be a noticeable difference. I can take pics of mine if you wanna see how it's supposta work.
As for the CDR output, mine is vented to the atmosphere. Can't say I like it, but I no longer have a place for it to go since I'm now running a 6.5 intake.
After 3 years of this I now have an oily film on the rocker panel. Annoying, but still not enough to be dripping. I'll note that it's not supposed to be an oily output, if you're getting large amounts of oil the CDR valve has probably failed. I look at recycling the oil as a good thing...it's free fuel for the oil-burning engine. And having the mess building up slowly on the body panels seems tacky to me. Obviously not bad enough for me to have done anything about it yet, but I do think about it from time to time.
You will have deleted the function, but you will still have the valve plugging your intake manifold. The non-emissions j-code intakes have noticeably larger air passages. Ditto for the 6.5 intakes like I'm running.
The vacuum pump can generate quite a whistle if it's not hooked up. Not sure if that's what you're dealing with.
REPLACE IT!
Todays ultra low sulfur diesel is horrible for fuel systems. They have taken out all of the lubricity in the fuel so it is really hard on the whole system since it uses the fuel to lubricate everything it runs through. I always run an additive. If I have access to it I run any kind of petroleum based oil in my tank to help it out. On my powerstroke and now my blazer also. Sometimes I get waste transformer oil(WTO) from work which is like 10 weight hyd oil and burns very well. I'll run a 5 gallon bucket to a 28 gallon tank of diesel. I have about 6-5 gallon buckets of clean used hyd oil at home now and I run a bucket of that to each tank of fuel on my powerstroke. I throw new atf in there also if I get some new stuff that isn't needed for anything else. I will prob start running the Stanadyne brand additive in my blazer since it has a Stanadyne pump. I've heard good things about it. I use Diesel Power Service or Howe's in our fleet at work. On anything newer with either a common rail injection system or a DPF you have to be careful and run the correct additive for the system. Common rail is a pretty tight tolerance system so I don't like to throw any extra weird crap in with those systems just regular additives. On the dpf systems(07 and newer) it needs to be an additive approved for a dpf.
I will research the CDR valve and most likely convert it to a standard draft tube and just cap off the ports on the intake that it goes to now.
I will research the CDR valve and most likely convert it to a standard draft tube and just cap off the ports on the intake that it goes to now.
Here is an interesting double-blind study on the lubricity effects of different additives. The guys running it found the cheapest way to ensure good lubrication was to add 2-cycle oil to their fuel. Interesting reading if you have some time.
http://www.dieselplace.com/forum/76.../177728-lubricity-additive-study-results.html
As for the wallet side of things, commercial additives are adding just a few bucks to each tank of fuel. It may or may not be worth it in the long run, but it's not an expensive addition to the hobby. More than a few guys have toasted IPs and then blamed modern fuel for their problems.
I've run Stanadyne and Power Service both. Hard for me to make any judgements about their effectiveness. I haven't ruined enough engines to draw valid conclusions.
(All of my engines are still running at this point).
No whistle. If I have the engine running and pull the vacuum line off the top of the pump the engine changes it's sound. Possibly egr related or something. I'm not worried about it I was just curious.
I thought you said EGR was already unhooked. Interesting. When I unhook my pump I get an obnoxious whistle on the pump end. You can't have much hooked up to the pump. Should just be emissions and HVAC if you have A/C. No tranny vacuum line unless you have a TH400 (which wasn't offered in civilian blazers).
Yeah one side of the tee goes to the HVAC and the other to the egr and some other engine stuff. Not sure what. I did have to egr vacuum plugged off before I did the pump but after changing the pump I hooked it back up to make sure that wasn't affecting my smoking/running issues.
The engine side of things should split 2 ways and go to 2 solenoids. One for EGR and one for EPR (the heat-riser on the driver side). Shouldn't have anything else on that engine.
I do have a gallon of Lucas Fuel additive. I usually run it in my gasser's every couple of tanks. It says it's good for diesel use too. Would that be efficient enough?
Lucas claims that their additive "totally neutralizes the harmful effects of low sulfur diesel fuel." FWIW. It should be noted that LSD (no, not that LSD) is not as hard on pumps as ULSD. Typo on their part? Maybe. But guesswork is a dangerous hobby.
Well, I guess I'll keep that gallon in my truck, and start adding it with every tank.
On older diesels even just throwing in a quart of cheap ass engine oil or atf helps keep it happy.
1 quart per 34 gallon tank?
Will I notice any changes in the way it runs?
Will I notice any changes in the way it runs?
No you won't notice anything. It will just add some of the sulfur back into the fuel which is what keeps injectors and pumps happy and well lubed. Some of the additives you will get a little better mileage and maybe notice a slight difference but I'm never consistent enough to notice. I used to run this stuff called "Drew's Brew" that I read about on another site. It is 8 oz of Marvel Mystery oil and 16 oz of Diesel Power Service I believe and you run it in every tank and it cleans out your fuel system and helps it run better. I did notice a mileage increase with it and maybe a slightly quieter/smoother running engine but you gotta buy and mix it yourself and consistently run it every tank or it doesn't work right.
http://dodgeforum.com/forum/dodge-ram-diesel/76132-drews-brew-explained-read-me-faq.html link for Drew's Brew info.
So I ended up still having too much black smoke on the highway. I pulled the cruise control actuator and throttle cable bracket to access the small cover on the driver side of the pump. I made the wife bar over the engine to line up the adjustment screw and I turned it down roughly 1/6 of a turn or so. I bypassed the egr and turned the idle down a quarter turn and the high Idle solenoid up until it was doing something. I test drove it and now just a slight black haze while accelerating on the highway and going up hills.
