Author Topic: idle too low when start up(with movie) (Read 8022 times)

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)

Ltsmash · « **Reply #1 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)

jtanguay · « **Reply #2 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.

carrizog60 · « **Reply #3 on:** March 24, 2008, 02:58:29 am »

what tests can be done?

jtanguay · « **Reply #4 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.

carrizog60 · « **Reply #5 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

carrizog60 · « **Reply #6 on:** March 25, 2008, 02:15:14 pm »

:idea:

jtanguay · « **Reply #7 on:** March 25, 2008, 07:43:32 pm »

that thing is clacking something fierce!

burn_your_money · « **Reply #8 on:** March 25, 2008, 07:49:47 pm »

Quote from: "jtanguay"

that thing is clacking something fierce!

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

carrizog60 · « **Reply #9 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...

jtanguay · « **Reply #10 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.

carrizog60 · « **Reply #11 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...

jtanguay · « **Reply #12 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?

carrizog60 · « **Reply #13 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:

Ltsmash · « **Reply #14 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