VWDiesel.net The IDI, TDI, and mTDI source.

General Information => Troubleshooting => Topic started by: carrizog60 on March 23, 2008, 12:06:25 pm

Title: idle too low when start up(with movie)
Post by: carrizog60 on March 23, 2008, 12:06:25 pm: hello

i have been messing with the cold start mechanism to try to low my idle in order to increase the fuel but after that when cold my idle stays to low...
750rpm and the engine shaking too much but after a while it rises to the normal 1000rpm...

what could this be?

also what is the proper way to adjust the cold start lever as i want to check my timing and dont know if that is properly adjsuted(i messed with the bolts on the side/top)
Title: idle too low when start up(with movie)
Post by: Ltsmash on March 23, 2008, 07:36:44 pm: have you properly adjusted your residual fuel quantity screw? (the idle stop screw)...if that is incorrectly adjusted it could give a variance in idle.

To set it...screw it in until idle just barely increases and lock in place...as for the proper adjustment on the cold start lever adjustment i'm pretty sure there is no "standard" adjustment, all depends if your governor is set correctly (proper load on the idle spring/fuel screw)
Title: idle too low when start up(with movie)
Post by: jtanguay on March 23, 2008, 11:22:20 pm: sounds like one cylinder might not be firing properly. that would cause a low idle and some shaking.
Title: idle too low when start up(with movie)
Post by: carrizog60 on March 24, 2008, 02:58:29 am: what tests can be done?
Title: idle too low when start up(with movie)
Post by: jtanguay on March 24, 2008, 11:58:06 am: Quote from: "carrizog60"
what tests can be done?

one way is to loosen the injector line nut going to the injectors one at a time. if the idle lowers, then that injector is fine. if nothing changes then that injector (or cylinder) isn't firing properly. if it goes away after a few minutes, it could be a bad glow plug.
Title: idle too low when start up(with movie)
Post by: carrizog60 on March 24, 2008, 03:14:38 pm: heres a video...

movie doesent show but car shakes way to much...
i also tryed to show my settings on the pump,dont know if helps...
timed to 1.05mm,155bar merc nozzles on 1.6 bodies.
http://www.youtube.com/watch?v=4YZiAkCzZmY
Title: idle too low when start up(with movie)
Post by: carrizog60 on March 25, 2008, 02:15:14 pm: :idea:
Title: idle too low when start up(with movie)
Post by: jtanguay on March 25, 2008, 07:43:32 pm: that thing is clacking something fierce! :o
Title: idle too low when start up(with movie)
Post by: burn_your_money on March 25, 2008, 07:49:47 pm: Quote from: "jtanguay"
that thing is clacking something fierce! :o

I'd say. How old are your injectors?

Can you hear an increase in idle? The way the tach moved looked more like the belt was slipping and giving a false reading
Title: idle too low when start up(with movie)
Post by: carrizog60 on March 26, 2008, 01:00:16 am: no,the idle just stays low.
it increases slowly but the tacho goes up at the same time.

the injectors are gtd bodies with merc 261 nozzles set to 155 bar,nozzles have less that 6 months and 2 month ago i checked the opening pressure and was ok...

the engine is a solid lifter n/a converted to turbo,i thouth that it would clatter more because of that...
Title: idle too low when start up(with movie)
Post by: jtanguay on March 26, 2008, 08:48:10 pm: true... solid lifter will definitely clack more.

in my experience with both GTD's and regular TD nozzles, i would have to say that the GTD's felt good on the butt dyno... much better than the regular TD's. i couldn't accurately measure my mpg before because of some really bad tires, but now hopefully my mileage will increase some.
Title: idle too low when start up(with movie)
Post by: carrizog60 on March 27, 2008, 12:42:19 am: i cant say if i have more power since the car when it came back had the pump 1 tooth off,diferent settings on smoke screw and now,even after i tryed to put everything the way it was before the boost wont go more than 1.6 bar...
Title: idle too low when start up(with movie)
Post by: jtanguay on March 27, 2008, 03:00:06 am: Quote from: "carrizog60"
i cant say if i have more power since the car when it came back had the pump 1 tooth off,diferent settings on smoke screw and now,even after i tryed to put everything the way it was before the boost wont go more than 1.6 bar...

hmmm 1.6 bar is quite a bit.. how much were you running before?
Title: idle too low when start up(with movie)
Post by: carrizog60 on March 27, 2008, 01:46:55 pm: well, before i was running 2 bar at 4800rpm...
if i rev more it would go further on boost too :twisted:
Title: idle too low when start up(with movie)
Post by: Ltsmash on March 30, 2008, 12:54:02 am: sounds like your running with no wastegate :lol:

its quite the rush pulling 35psi of boost in these motors...:twisted:

too bad they are so gutless at higher rpm, well at least mine is haha :cry:

sounds like perhaps a fuel screw adjustment is needed...raise the idle and increase max boost
Title: idle too low when start up(with movie)
Post by: carrizog60 on March 30, 2008, 02:11:35 am: well,mine has "top" end.
or had...
(http://img126.imageshack.us/img126/4166/dyno16gtdvy1.jpg)

i cant up more the fuel because i have the idle on 1000 and cant lower it more...
Title: idle too low when start up(with movie)
Post by: carrizog60 on April 05, 2008, 07:16:45 am: regarding the low idle quetion anyone have more thoughts :idea:
Title: idle too low when start up(with movie)
Post by: jtanguay on April 05, 2008, 01:09:01 pm: maybe try the residual fuel screw adjustment.
Title: idle too low when start up(with movie)
Post by: carrizog60 on April 06, 2008, 03:11:26 am: its all backed out so i can have more fuel...
Title: idle too low when start up(with movie)
Post by: jtanguay on April 06, 2008, 04:18:05 am: Quote from: "carrizog60"
its all backed out so i can have more fuel...

might be your problem right there
Title: idle too low when start up(with movie)
Post by: carrizog60 on April 06, 2008, 11:22:46 am: going to try that...
i put it that way to try to have enough energy to spool the turbo to +2 bar but i cant...
that car smokes so i think that the merc dn261 nozzles are a downgrade in my case...
Title: idle too low when start up(with movie)
Post by: carrizog60 on April 14, 2008, 12:04:17 am: i messed with residual screw and its the same... :roll:
could be the linkage of the cold start?