Author Topic: 1.9 AAZ engine 'problem'  (Read 3587 times)

February 08, 2012, 08:20:50 am

RedRotors

  • Veteran

  • Offline
  • ***

  • 734
    • http://www.mikrotuning.com
1.9 AAZ engine 'problem'
« on: February 08, 2012, 08:20:50 am »
Hi guys,

A friend of mine had an 1.9td running 30psi and when it's cold, like winter time, and the engine is cold, too much
boost ( we think ) jack the lifters and then the engine stall, try to crank and it's turning free like no compression at
all, we let it settle down, and the engine fired up again. I think that there's a box in the original setup that lower
the boost when cold to avoid this problem ? But anyone know the exact cause ?

cheers,
Marc/


2k1 Golf TDI, 11mm pump, HFLOX Warp 5, VNT17, Wavetrac, 4" Lift
91' VW Golf Country
94' Dodge RAM 2500, 4x4, Cummins, 5 spds, 191's, 215hp injectors, SB Clutch
03' Dodge RAM 2500, 4x4, Cummins, 6 spds, MBPR 4 ", custom intake, Smarty Jr

-> www.mikrotuning.com <-
-> www.hflox.com <-

Reply #1February 08, 2012, 08:33:17 am

CRSMP5

  • Guest
Re: 1.9 AAZ engine 'problem'
« Reply #1 on: February 08, 2012, 08:33:17 am »
i had a issue like this once...

pull the oil pan...

pull the oil pump

there is a freeze plug looking thing on it, this is the oil pressure releife valve.. what you wanna do is drill it with a small drill bit across the freeze plug for a piece of wire to go thru when you PUT IT BACK TOGETHER.. now there is a hole in this freeze plug that i use a slide hammer on to pull it out.. be carefull as there is a spring and a piston inside.. bet the piston does not move freely.. or is stuck.. make it move freely.. LOL..

now he is doing all kinds of wrong.. 30psi when the oil is under 50*c is BAD for oil seals and such.. will blow them out and make all kinds of leaks..

Reply #2February 08, 2012, 08:55:31 am

RedRotors

  • Veteran

  • Offline
  • ***

  • 734
    • http://www.mikrotuning.com
Re: 1.9 AAZ engine 'problem'
« Reply #2 on: February 08, 2012, 08:55:31 am »
He's now running in WOT @30psi when the engine is frozen, but i will ask him the exact facts when this happen.

So it's the release valve in the oilpump that don't do it's job ? So what's the relation with boost ? at low boost, no problem
at all...
2k1 Golf TDI, 11mm pump, HFLOX Warp 5, VNT17, Wavetrac, 4" Lift
91' VW Golf Country
94' Dodge RAM 2500, 4x4, Cummins, 5 spds, 191's, 215hp injectors, SB Clutch
03' Dodge RAM 2500, 4x4, Cummins, 6 spds, MBPR 4 ", custom intake, Smarty Jr

-> www.mikrotuning.com <-
-> www.hflox.com <-

Reply #3February 08, 2012, 09:53:59 am

CRSMP5

  • Guest
Re: 1.9 AAZ engine 'problem'
« Reply #3 on: February 08, 2012, 09:53:59 am »
engine rpm = oil pressure when cold... has enough pressure to pop the lifters open far enough to not let the valves close all the way..

the releife valve for what ever reason is sticking..

i had this issue on a franken engine i built that was a gasser.. but it would pop the valves open as soon as it built pressure.. aka car fires then 0 compression..

Reply #4February 08, 2012, 10:11:18 pm

andy2

  • Veteran

  • Offline
  • ***

  • 715
Re: 1.9 AAZ engine 'problem'
« Reply #4 on: February 08, 2012, 10:11:18 pm »
It could be that there is not enough valve guide to valve stem clearance and/or excessive emp's.

http://www.vwdiesel.net/forum/index.php?topic=30231.30
94 Golf TTDI-M
99.5 Jetta TDI
86 Samurai M-tdi AHU rockcrawler

Reply #5February 13, 2012, 02:50:33 pm

CRSMP5

  • Guest
Re: 1.9 AAZ engine 'problem'
« Reply #5 on: February 13, 2012, 02:50:33 pm »
any updates?

Reply #6February 13, 2012, 04:31:07 pm

RedRotors

  • Veteran

  • Offline
  • ***

  • 734
    • http://www.mikrotuning.com
Re: 1.9 AAZ engine 'problem'
« Reply #6 on: February 13, 2012, 04:31:07 pm »
any updates?

the engine is sold since a while... I was asking because i want to build an AAZ for a project and don't want to end up with
this problem, as my ALH is running high boost w/o problem.
2k1 Golf TDI, 11mm pump, HFLOX Warp 5, VNT17, Wavetrac, 4" Lift
91' VW Golf Country
94' Dodge RAM 2500, 4x4, Cummins, 5 spds, 191's, 215hp injectors, SB Clutch
03' Dodge RAM 2500, 4x4, Cummins, 6 spds, MBPR 4 ", custom intake, Smarty Jr

-> www.mikrotuning.com <-
-> www.hflox.com <-

Reply #7February 13, 2012, 11:01:48 pm

CRSMP5

  • Guest
Re: 1.9 AAZ engine 'problem'
« Reply #7 on: February 13, 2012, 11:01:48 pm »
ahhhh ok... no its not a common issue at all... usually the oil filter gasket blows first... ive seen that happen way more often... till your post mine was the only one i have heard of such odd things..

Reply #8February 14, 2012, 09:28:38 pm

maxfax

  • Veteran

  • Offline
  • ***

  • 2126
Re: 1.9 AAZ engine 'problem'
« Reply #8 on: February 14, 2012, 09:28:38 pm »
Just to clarify Marc, when you refer to boost, do you mean from the turbo, or the oil pressure???  

Reply #9February 14, 2012, 09:53:01 pm

R.O.R-2.0

  • Veteran

  • Offline
  • ***

  • 7335
  • Personal Text
    Pacific Northwest - Oregon - USA
Re: 1.9 AAZ engine 'problem'
« Reply #9 on: February 14, 2012, 09:53:01 pm »
Just to clarify Marc, when you refer to boost, do you mean from the turbo, or the oil pressure???  

charge air, im sure..

cause 30psi oil pressure @ WOT would be HORRID..
92 Jetta GLI - Black, 1.6D w/ GT2056V turbo..
86 GTI - 4 Door, Med Twilight Gray, Tow Machine..
86 Audi Coupe GT - Tornado Red, All Stock.. WRECKED.
89 Toyota 4Runner - Dark Grey Metallic, LIFTED!

Turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.

Reply #10February 14, 2012, 10:15:12 pm

maxfax

  • Veteran

  • Offline
  • ***

  • 2126
Re: 1.9 AAZ engine 'problem'
« Reply #10 on: February 14, 2012, 10:15:12 pm »
cause 30psi oil pressure @ WOT would be HORRID..

That was my thought, especially on a cold engine...   Of course that makes less sense with the problem being discussed...


Reply #11February 15, 2012, 08:02:53 am

RedRotors

  • Veteran

  • Offline
  • ***

  • 734
    • http://www.mikrotuning.com
Re: 1.9 AAZ engine 'problem'
« Reply #11 on: February 15, 2012, 08:02:53 am »
Just to clarify Marc, when you refer to boost, do you mean from the turbo, or the oil pressure???  

Turbo boost :)
2k1 Golf TDI, 11mm pump, HFLOX Warp 5, VNT17, Wavetrac, 4" Lift
91' VW Golf Country
94' Dodge RAM 2500, 4x4, Cummins, 5 spds, 191's, 215hp injectors, SB Clutch
03' Dodge RAM 2500, 4x4, Cummins, 6 spds, MBPR 4 ", custom intake, Smarty Jr

-> www.mikrotuning.com <-
-> www.hflox.com <-

Reply #12February 15, 2012, 11:25:31 pm

maxfax

  • Veteran

  • Offline
  • ***

  • 2126
Re: 1.9 AAZ engine 'problem'
« Reply #12 on: February 15, 2012, 11:25:31 pm »
Thanks for the clarification..   With that being said, I think CRSMP5 probably nailed what happened..  Nothing so much to do with the turbo...

Reply #13February 16, 2012, 03:02:49 am

CRSMP5

  • Guest
Re: 1.9 AAZ engine 'problem'
« Reply #13 on: February 16, 2012, 03:02:49 am »
well it took 3 days for me to figure out what was going on with mine.. since i had rebuilt the head and all i was worried i had sticking valve guids.. but reality is.. engine not warm.. LOL.. i am serious.. it would hit to fire up then 0 on all 4 holes.. i also had a diesel oil filter on it for the added 1/2 qt of oil.. which is the reason i think it did not pop the oil filter gasket vs gas ones that tend to blow the seal when this happens..

it is not common... till this thread my own is all i have ever seen do such a thing.. why i wondered what he had found out.. kinda sux that the project was sold off and we will never know.. :(

Reply #14February 16, 2012, 07:15:07 pm

RedRotors

  • Veteran

  • Offline
  • ***

  • 734
    • http://www.mikrotuning.com
Re: 1.9 AAZ engine 'problem'
« Reply #14 on: February 16, 2012, 07:15:07 pm »
I agree, it's sold now, but because I will probably built one, we will see if the ghost will come back..


PS : Plz fill your location ID CRSMP5  ;)
2k1 Golf TDI, 11mm pump, HFLOX Warp 5, VNT17, Wavetrac, 4" Lift
91' VW Golf Country
94' Dodge RAM 2500, 4x4, Cummins, 5 spds, 191's, 215hp injectors, SB Clutch
03' Dodge RAM 2500, 4x4, Cummins, 6 spds, MBPR 4 ", custom intake, Smarty Jr

-> www.mikrotuning.com <-
-> www.hflox.com <-