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Engine Specific Info and Questions => IDI Engine => Topic started by: Fredrikkk on April 04, 2011, 02:18:40 pm
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I turned my fuel screw in about half a turn in and backed off the smoke screw to get a good balance between smoke on and off boost. I have the turbo dialed in to 1.1-ish bar and there is no smoke on boost. I was able to adjust the idle down to 950 afterwards. However, now that I'm driving it, it seems like it's either lost compression or there is some residual fuel that runs into the cylinders after I let off the throttle.
Engine braking isn't as effective as before..
I didn't blow my HG or piston rings did I?
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Is the only symptom that engine breaking doesn't seem as effective?
does it still start fine?
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It still starts fine, drives like never before, leaves a little bit of black smoke and then it clears up.
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fuel screw in too far?
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I haven't gotten the metal jacket off, so I doubt it... :P I can still adjust the idle with the long idle screw on the back of the pump. It barely smokes too.
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I haven't gotten the metal jacket off, so I doubt it... :P I can still adjust the idle with the long idle screw on the back of the pump. It barely smokes too.
wrong throttle spline does strange things
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But I haven't touched the throttle lever either.. :P I mean it doesn't really bother me, but I was just wondering if anyone had an answer!
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if you turn the fuel screw in too far, you dont get the same quantity of engine braking, try turning it back out about 1/8 or 1/4 turn..
you didnt lose compression, the governor is just hanging ever so slightly.
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The man who has an answer for everything.
Thanks! I will do that :)
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The man who has an answer for everything.
Thanks! I will do that :)
I told you way at the top that you had the fuel screw in too far, do I not have enough posts to be taken seriously yet or something? dang,
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The man who has an answer for everything.
Thanks! I will do that :)
I told you way at the top that you had the fuel screw in too far, do I not have enough posts to be taken seriously yet or something? dang,
you guessed tho, i gave him a definitive answer, and a reason why.. thats why i got the praise. good job for being on the right track tho!!
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The man who has an answer for everything.
Thanks! I will do that :)
I told you way at the top that you had the fuel screw in too far, do I not have enough posts to be taken seriously yet or something? dang,
I need a definite answer you see. And I do tend to listen to people with more posts as they usually have more experience. ;) you were on the right topic though so I thank you :)
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yeah that ROR guy is pretty bang on. but does the governor hang? THe "MAX" fuel screw. really, what it does is limit the potential travel of the flyweights in the governor. The more you turn it in, the more they are held back. and when they get held back, the springs connected to your throttle lever win the battle and pull the spill collar further on the spill port, resulting in more fuel.
Hence less engine braking, cause after a certain point you never get the sweet, zero injection duration when off throttle at highway speed.
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yeah that ROR guy is pretty bang on. but does the governor hang? THe "MAX" fuel screw. really, what it does is limit the potential travel of the flyweights in the governor. The more you turn it in, the more they are held back. and when they get held back, the springs connected to your throttle lever win the battle and pull the spill collar further on the spill port, resulting in more fuel.
Hence less engine braking, cause after a certain point you never get the sweet, zero injection duration when off throttle at highway speed.
it hangs the governor, but just ever so slightly.
basically not enough so that your engine holds rpms, or runs away, but just enough that when you engine brake, it hangs just a tiny bit.
its supposed to basically shut the fuel off to the engine when you let off the pedal and the engine is braking.. but with the screw in a tad too far, the governor hangs a tiny bit, and cant completely shut off fueling, like it previously did..
just play with your smoke screw till you get it, 1/8 - 1/4 of a turn at a time. turning it out, not in.. turning the screw in will only make things worse..
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Alright well I turned it ever so slightly out and it is all well now. No more hanging and the engine brakes properly :D'
Thanks for all help!
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Alright well I turned it ever so slightly out and it is all well now. No more hanging and the engine brakes properly :D'
Thanks for all help!
glad you got it sorted out..
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ROR, you are a smart guy. I think we mean the same. Just wording different. How do I put pics up on here. I would like to show off my Jetta and show the pin I want to put in my pump. and my boost triggered advance set-up
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ROR, you are a smart guy. I think we mean the same. Just wording different. How do I put pics up on here. I would like to show off my Jetta and show the pin I want to put in my pump. and my boost triggered advance set-up
you have a photobucket account (or something similar for hosting pics)??
if you do, you upload your pics to there, and then you use the IMG code from there..
http://www.vwdiesel.net/forum/index.php?topic=10418.0 (http://www.vwdiesel.net/forum/index.php?topic=10418.0)
kinda outlines it..
if you need more help, im sure one of us will help you out..
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I have this very problem of hanging the accelerator on upshift. Time to go play with the screws for smoke, idle and retime I suppose. Just had the injectors rebuilt as I thought that might be the problem. I did see leaky fuel in two of the chambers when I removed them. I also have a difficult time starting it and once it fires it is very smokey. But goes away and no smoke at high rpms and long hill pulls. Very confusing symptoms so it seems. One set of indicators points me one direction but then another set says no, don't go there.
Have to love them diesels though. Keeps me out of the bars.
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I have this very problem of hanging the accelerator on upshift. Time to go play with the screws for smoke, idle and retime I suppose. Just had the injectors rebuilt as I thought that might be the problem. I did see leaky fuel in two of the chambers when I removed them. I also have a difficult time starting it and once it fires it is very smokey. But goes away and no smoke at high rpms and long hill pulls. Very confusing symptoms so it seems. One set of indicators points me one direction but then another set says no, don't go there.
Have to love them diesels though. Keeps me out of the bars.
well, i would say you are on the right track. the hanging throttle on shifts, definitely fuel screw related..
and as for the smokey, difficult starts, that sounds like your timing is quite a bit retarded from where it should be.
(when i had a gasser mk2, i was always in the bars. now that im driving my diesel again, ive been to the bar maybe twice in the last 6 months. [because i was always busy working on the diesel)
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I had a hanging idle once for no reason (meaning I hadn't messed with anything lately), turned out the two lever return springs on top of the IP were binding. I had to remove the bottom one to fix it, it also gave the pedal a lighter feel.
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Pedal is plenty light, no problem there. But with the smoke screw turned in as much as it is you can see why. Work to do this weekend. Just need to stop at the store for brew after the work is done.
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ITs time to do a master injector and timing check and internal pressure on my car.
the jump is missing.
I would gladly pay with money or beer for any help if in the winnipeg area.