I failed my emmisions and want to lower my fuel pressure. The truck is a 94 with the ats turbo system, under hard acceleration it blows a bit to much black smoke. I thought that on that truck you could turn down the fuel pressure by the fuel pressure regulator located under the air plenum on top of the engine.(behind a grey cap) I seem to remember reading that you could turn one of the screws cc some and lower the pressure. If that is correct there are 2 screws behind plastic "do not remove" caps. What screw is the one? Where can I find this info? Or if I am wrong about this, how can I lower the pressure for the test.??????????????

Thanks

 

WOW,what the hell state do you live in pard, I didnt think any states smoged diesels.

 

Washington.

 

76and92' Kalifornia is one of the first states to "smog" diesels . At least they do big trucks , and they will ticket you if your truck smokes !

 

Try - www.members.shaw.ca/k2pilot/
I think there are directions how to turn it up, so just do reverse.

 

About the only thing you can do is back off the fuel in the injection pump and check the timming. Crank it back up after you pass the emissions test.

Utah also has emission testing for diesels along the Wasatch Front, Salt Lake, Bountiful, Ogden and Provo. Rumor is the whole state is eventually going to have emsission testing for diesels.

One part of a test that really torque's me is the "snap throttle" opacity test where they stomp on the throttle and check the smoke opacity with a square of plexi-glass that is smoked in gradient levels from darker to lighter. They look through the glass at the smoke comming out of the exhaust and eyeball determine the opacity. Gimmee a break!! Yeah, lets not even wait for the turbo to spool up and fail the stupid emission test.

They want to castrate these engines to the point they won't run right, won't pull and fuel milage sucks when what really needs to be done is set em up right and educate diesel owners on HOW to drive a diesel. Far to many people try to drive a diesel like a gas engine so to make it fool proof they add aneriod valves, sensors, computers, converters and other crap. Gas engines are not excluded either. Take a well maintained, well tuned older diesel OR gas engine without any emission junk on it and it will pass emission tests with like new car numbers.

I guess you can tell this is kind of a sore spot for me

 

Thanks for that site.

 

Well after another try I passed. Anyone searching for emmisions and you come across this here is what I did. Installed new injectors $175, after installing them though there was still the same amount of smoke comming out the tail pipe, although I'm not sure what they test for smoke might not be the problem. IMO this was a waste of money unless there might be more mpg due to a cleaner misting action. 2 removed the air cleaner for the test. 3 got that sucker hot before the testing, 4 turned the injector pump down 90' that probally was all i needed to do, after that there was almost no smoke. 5, just to be positive I passed I disconnected the tail pipe and installed it half on so 50% came through. went from a 60/40 to a 6/40 so even with the full exhaust that would be a 12 out of 40. I think the main thing was the pressure, turned out to be fairly easy to due other than alligning that damn allen. Thanks for your help guys.

 

Glad to hear ya passed ! But it kinda P***es ya off you have to go through it all . Don't forget to thank a tree hugger !

 

Just so you all know: I live in the fine state of New Jersey. We have something called the "Sierra Club", (tree huggers). They are now pushing for lower diesel emisions. We are going to vote in a new governor soon. They will push for someone like minded. And they don't care about the cost of what they do. They want it their way, and thats it.
Here we go with more emisions testing problems.

 

The bad part about us up here in WA is that the test number used to be 60! Some enviro-terrorists decided that wasn't good enough. I can't wait to get our new Rep. governor in office!

 

How can they give you a ticket for a diesel that smokes, I havent seen one that dosn't smoke yet.

 

I believe in Washington all they test is opacity.......

 

If everything is to specs , and no chip or tuner there should be very little or no smoke from a diesel .

 

Almost every state has an applicable smoking statute. It's mostly for cars that burn oil, but it can be applied to diesels as well. It's not all bad, there are a lot of people who turn up the fuel to the point where they are just wasting it. I don't want my grandkids to not know what clear air looks or smells like. I'm not saying I like tree huggers, personally I think everybody should have one mounted over the fireplace. But cleaning up the environment isn't all bad, as long as they don't go overboard with it.