Suspected Gov problem but thinking otherwise

[Smokey Eddy]

I just put my new head on and i've driven it just around my block a couple times (its not insured :oops: ) and it has bizzare lurching issues with low rpm. Makes me, and others, think it's something with the Governor as i HAVE shimmed it but that was at least a year ago.

I haven't properly (with a gauge) set the timing yet and the injectors are not calibrated (and they have old nozzles in them that i've cleaned up and made sure none stick)

Just wondering basically if really advanced timing can cause this?
She starts great, just amazingly, has tons of power even with the turbo disconnected. WITH the turbo it's just insane...

I've yet to notice any thick black smoke too.
I saw my egt gauge move for the first time yesterday. Drove it with no boost to see what it's like and when i put my foot down the egt hit 800 by the time i was well into third - there i saw smoke. WITH the turbo the egt's stay really really low. Non-existant on my gauge that reads a min of 600F. but that info i guess is beside the point to this post so i'll shut up about it.

So yer, COULD timing cause a lurching at low rpm? maybe fuel screw setting? residual? let me know what you think! I haven't TOUCHED the pump other than the LDA since i did the major upgrades (those being aaz head, polished everything, waste gate block, BOV delete and big DP)


my pump mods and other useful info as a list are:
 

- timing advance shim removal (and i have a green spring)
- shimmed the gov stiff with a piece of pipe
- i've changed a bunch of seals but no metal pieces (yet) including the shaft seal. It never leaked but i changed the seal to prevent air entering through there.
- the fuel filter has less than 2k on it
- running 15w40 conventional for break in. Engine always started with block heater heating the oil to about 80-90F
- the diesel could be quite old. Probably 4-5 months? the last time i put diesel in it was in the summer
- there COULD (very unlikely) be cetane booster still in the fuel filter

and i think that's it...

[burn_your_money]

Set the timing and fix your injectors before you go hunting for problems.

[jtanguay]

just to let you know, the summer diesel (AFAIK) does not have the same antigel as the winter stuff.  

do as Tyler says. i bought some .216 chinese nozzles, and my mTDI seems to start like ass...  :cry: i'm not sure if thats the reason it starts so rough in the cold, or the air leak (probably compounding the issue) but i get some good white smoke when its at -20C and even a bit warmer than that.  HOWEVER that is without glowplugs, so they might help clean up the smoke a bit... seems to run just fine when its warmed up though. i need to get off my ass and change those, but the damn heater core issue has me a bit depressed (damn car!!!) :lol:

as soon as i get some spending money, i'll probably switch over to some proper bosio nozzles for my motor.  they run ok for now, but i bet in the near future they will start giving me trouble..

i dont think timing will really cause the lurching that you're experiencing... i almost bet if you put the spring back in the gov, your issues will be solved.  its hard to explain, but i got a pump from andy2 that had similar issues (he gave it full fueling to redline  :shock:  :twisted:), i just had to adapt my driving to the way the pump functioned (it wasn't too bad, but if i let off the pedal, the car bucked pretty good..  and it didn't do that with the old pump).  it was a trade off for high rpm fueling  :twisted: however there are ways of getting best of both worlds, but it takes quite a bit of skill and trial & error testing.

i think the secret may lie with the idle screw and the residual fuel screw... oh and a bit more 'fiddling' with the governor... i seem to recall a thread advising which spring to 'shim'.  i think the main spring is what you want to shim, and the idle spring you want to let be.

[zukgod1]

Set the timing and fix your injectors before you go hunting for problems.

I'm going to have to agree with Tyler.

You need to have a good base to work off.

Get your injectors done and set the timing properly.

[Smokey Eddy]

Set the timing and fix your injectors before you go hunting for problems.

I'm going to have to agree with Tyler.

You need to have a good base to work off.

Get your injectors done and set the timing properly.

  well i guess i'll just live with it then. I don't have the tools to do those things or the coin to buy the stuff to do it. Dave at passenger said he'd do the timing for some beer but i gotta insure it before i can drive it there...



jtanguay, I hope you're right as i have changed the engine significantly and not touched the adjustments on the pump. As for your whiteness i'd say thats 100% normal for -20 with no glow plugs... just at -5 with no glow plugs my new IDI smoked like a mother! so bad i just killed it and wired up the GP's... kept them on for probably 15 seconds after it started and that was enough to get it purring nicely. once they go off there is a bit of white but nothing major.

[rallydiesel]

Which spring did you shim on the governor?

[Smokey Eddy]

so hard to remember...
You know i just can't be sure. Maybe the small one?
I followed a guide when i did it, i remeber that... and i noticed a huge difference in how the rpm climbed.

I have a spare gov. from a NA pump. Maybe i should just revert it back to how it was?

[jtanguay]

so hard to remember...
You know i just can't be sure. Maybe the small one?
I followed a guide when i did it, i remeber that... and i noticed a huge difference in how the rpm climbed.

I have a spare gov. from a NA pump. Maybe i should just revert it back to how it was?

read this post.  jimfoo has some good input on the governor mod.  i'm pretty sure the small spring is the intermediate spring, and will cause low rpm issues... better to shim the main spring (leave the long spring, but add something maybe 1cm long in there so there is pre-load)  and that should do it.  but its probably best that you read through that entire thread...

[Smokey Eddy]

That is exactly what i did.

Edit: That is the thread I followed. I remember now. Notice the date of jim's last post feb. of 08. I joined in july of 08 but i read the forum a lot before i joined.

[Smokey Eddy]

I just went outside and looked at my pump. It's still really clean from when i had the old head off (I cleaned everything up as i had room to do so)

Could i just pop the top off? When i took it apart last time i drained it through the fuel screw. if i take the top off right now will diesel spew everywhere?

[rallydiesel]

No it won't spew. First time I did a governor mod, I did it by just taking the pump top off while still on the car.

[Smokey Eddy]

ok! that's what im doing right now!    I'll take a picture of my gov and post in 20 minutes  

[jtanguay]

ok! that's what im doing right now!    I'll take a picture of my gov and post in 20 minutes  

you got 2 minutes!  hurry!! :lol:

[Smokey Eddy]

oh i gave up because i forgot how much sh!t you have to dissasemble from the pump. I'll deal with that later. Right now i have a much more pressing issue

my buddy who welded the downpipe got weld into the holes of the flange and that has severely effed it up because the bolts wont thread into the turbo anymore. I tried drilling it out but without a press & vice all i accomplished was two broken bits and egg shaped holes. ... i guess its time to spend a few hours with a file...

[truckinwagen]

Dremel!!!
I cant tell you the number of times my dremel has saved my ass, if you dont have one you should get one(or at least a cheap knock off)