VEMS Community Forum

Technical => Wiring & Sensors => Topic started by: mr_g on April 03, 2010, 12:51:45 am

Title: EGT senzor readings jumping around?!
Post by: mr_g on April 03, 2010, 12:51:45 am

EGT reading is jumping all around...  ??? But only when I'm driving on LPG. On gasoline it is just fine...

So, I was thinking that the reason is lowZ LPG injectors and active flyback connected on, and installed inside the VEMS box...

I have EGT wires bought in the vems shop (no wire ground shield) and the EGT sensor also (with wire ground shield)..

Any ideas?

BTW, Roadspeed is jumping around also (only on LPG). I use signal from ABS sensor, and LM1815 and frequency divider (by 2)...

Title: Re: EGT senzor readings jumping around?!
Post by: mr_g on April 27, 2010, 09:35:52 pm

Anybody? :?:
(http://slike.hr/slike/m/mrglog_ba1c5.jpg)

Title: Re: EGT senzor readings jumping around?!
Post by: mr_g on May 05, 2010, 02:43:28 pm

I think I have found the solution... Will try today...

(http://img11.imageshack.us/img11/5408/egtfilter.png)

Title: Re: EGT senzor readings jumping around?!
Post by: mr_g on May 06, 2010, 02:20:20 pm

This 220nF filter cap isn't shown on schematics, and there is no way that I could have known this... I have spent hours wasting on finding the solution for EGT jumping all a round...  >:( >:(

This is a sticky topic!  :-\

Title: Re: EGT senzor readings jumping around?!
Post by: lost on September 09, 2016, 08:57:01 pm

I know its old post... What the solution for jumping EGT with low-z LPG?
Mine jumps for moment like one cyliner overheats. while driving its 1200celsius

Title: Re: EGT senzor readings jumping around?!
Post by: lost on September 10, 2016, 12:02:56 pm

My EGT sensor is connected to exhaust output of one head of V6 engine,  even with all injectors disconnected on that head i get EGT gauge in VEMS to jump as engine is running , somehow releated to rpm.
That happens only when running injectors with low-z 8ch extension, when i run high ohm injectors with PWM disabled i dont have that problem.

Where is 220nF capacitator that "Mr_G" was writing about in this topic?

I have v3.6

Title: Re: EGT senzor readings jumping around?!
Post by: lost on September 17, 2016, 09:20:48 am

This should be solved after adding 220nF capacitator between + and - egt wires.