Idle valve always fully open

Ask questions about DIY board assembly issues, fault finding and testing. (Covers all Megasquirt versions and board.)

Moderators: jsmcortina, muythaibxr

Post Reply
gloom15
Helpful MS/Extra'er
Posts: 61
Joined: Fri Dec 21, 2012 5:07 am

Idle valve always fully open

Post by gloom15 »

I have bought megasquirt V3.0 partial kit, assembled it using parts that I have bought in a local shop, installed MS3 daughterboard and using it to run 13b-rew on my mazda rx-7. Everything works fine except one thing - when I connect idle valve my RPM rise to 2400-2500 and I can't decrease it. Board modification was made using manual, I have installed TIP127 (can't find TIP122, but as I can see it's full analog), removed D8, Q4, Q20 and other steps from manual. Checked all twice. I also have a microsquirt, when I run engine using it, I can set RPM from 600 to 2500. I also have megasquirt 1 proccesor, I tried to install it, RPM was 2500 too... Tunerstudio settings doesn't affect anything. Checked for short circuit - there is 0-1 Ohm
relative to the ground on PIN3 of TIP127 and infinity Ohm relative to the ground on PIN1-2. As I can see - problem may be in proccesor (but not in 2 proccesors at the same time) or in TIP127, am I right?
DaveEFI
Super MS/Extra'er
Posts: 4175
Joined: Sun Apr 15, 2012 12:55 am
Location: SW London, UK

Re: Idle valve always fully open

Post by DaveEFI »

TIP 122 is NPN. TIP 127 PNP.
Rover SD1 3.5 EFI
MS2 V3
EDIS
Tech Edge O2
London UK.
gloom15
Helpful MS/Extra'er
Posts: 61
Joined: Fri Dec 21, 2012 5:07 am

Re: Idle valve always fully open

Post by gloom15 »

lol.... i'm an idiot :)) will change to tip122 :) thank you :)
gloom15
Helpful MS/Extra'er
Posts: 61
Joined: Fri Dec 21, 2012 5:07 am

Re: Idle valve always fully open

Post by gloom15 »

can't find tip122 in local shops so I have installed tip102, working fine :)
Post Reply