Turbo 13B w/MS3Pro: Fires up for a second then dies after fixing MAP signal - Page 2 - RX7Club.com - Mazda RX7 Forum

Go Back  RX7Club.com - Mazda RX7 Forum > Tech and Performance > Engine Management Forum > Megasquirt Forum
Reload this Page >

Turbo 13B w/MS3Pro: Fires up for a second then dies after fixing MAP signal

Megasquirt Forum Area is for discussing Megasquirt EMS

Turbo 13B w/MS3Pro: Fires up for a second then dies after fixing MAP signal

Old 01-11-19, 11:44 PM
  #26  
burn to burn
iTrader: (3)
 
keithrulz's Avatar
 
Join Date: May 2005
Location: Rochester, IN
Posts: 1,601
Thanked 2 Times in 2 Posts
due to the video its a lot more clear to me that its at least partly the TPS signal. You cannot have it jumping around like that. You are engaging flood clear.

also I think the reason it will start without the map plugged in is because it seeing 100 kpa is preventing it from going into fuel cut. to enter fuel cut you need a low kpa and a descending rpm reading. but i may be wrong about this one..

also.. it looks like you're using an old firmware.. would probably be a good idea to upgrade as i know they had problems with implementing engine states. (and its still not right completely..)

Last edited by keithrulz; 01-12-19 at 12:01 AM.
keithrulz is online now  
Old 01-12-19, 12:37 PM
  #27  
Full Member
Thread Starter
 
ApexHunter's Avatar
 
Join Date: Nov 2010
Location: ---US---
Posts: 70
Thanks: 0
Thanked 0 Times in 0 Posts
Yeah the s4 tps is really biting me. It seems there’s no way to disable flood clear. Maybe I can manually input a sensor count while calibrating to a number that the tps cannot reach?

The seems to need some throttle input and prodding to sound like it’s about to start.

Hmmm. I’m pretty sure fuel cut decel (overrun fuel cut? whichever it’s called) is disabled but I’ll look into that.
ApexHunter is offline  
Old 01-12-19, 01:18 PM
  #28  
burn to burn
iTrader: (3)
 
keithrulz's Avatar
 
Join Date: May 2005
Location: Rochester, IN
Posts: 1,601
Thanked 2 Times in 2 Posts
After looking at your data logs which I could not do yesterday it's looking like you have severe noise issues. even your internal ECU temperature is fluctuating. everything is very spastic and you have many sync loss counts that climb as you're cranking. Poor grounding or unshielded CAS wiring or both need addressed.
keithrulz is online now  
Old 01-13-19, 01:55 PM
  #29  
Full Member
Thread Starter
 
ApexHunter's Avatar
 
Join Date: Nov 2010
Location: ---US---
Posts: 70
Thanks: 0
Thanked 0 Times in 0 Posts
Yeah, I noticed that the sync count seems to increase slowly during cranking. The ms3pro harness had shielded cas wires, the only unshielded portion I suppose is right where the wires connect to the weatherpack connector. I have the ECU with dual grounds to the engine as shown in the attached photo, which I figured should be sufficient.

I think I'm going to try and seperate the CAS wiring from the rest of the wires. Currently it is all traveling within the same split loom. I figured the shielding would take care of any issues, but maybe not.

Engine Grounds
ApexHunter is offline  
Old 01-13-19, 03:10 PM
  #30  
burn to burn
iTrader: (3)
 
keithrulz's Avatar
 
Join Date: May 2005
Location: Rochester, IN
Posts: 1,601
Thanked 2 Times in 2 Posts
How is the engine grounded? Are there grounds from the battery to those rotor housings as well?. The way I have it set up: Each rotor housing has its own ground wire to the battery. I then grouped each individual (6) ECU grounds and crimped them together with an eyelet connector at the same point as one of the rotor housing grounds. As for power I made sure nothing else is feeding off of the ECU power supply. As for the shielded wire being in the same loom as everything else i don't see that being an issue.. However, I would make sure nothing is ran near the coils. Here is my question. Are your signals still noisy on ACC without cranking and without the engine running?
keithrulz is online now  
Old 01-14-19, 03:54 AM
  #31  
Full Member
Thread Starter
 
ApexHunter's Avatar
 
Join Date: Nov 2010
Location: ---US---
Posts: 70
Thanks: 0
Thanked 0 Times in 0 Posts
The engine itself should be grounded via the starter grounding wire that grounds the starter as well and is attached to the driver side shock tower. I recently redid that cable and ring terminal and replaced all of it. So that should be good.

Those two grounds on the engine in the photo I posted go to the fuse panel. I donít have a great photo so I found a photo from my build and circled where those two wires end up



All of fhe ms3pro ground wires from both connectors are grouped together and attached to the ground panel via one ring terminal.

My battery is relocated to the passenger bin. 12v from the passenger battery goes to the fuse panel. The battery itself is grounded to the chassis within the passenger bin.
ApexHunter is offline  
Old 01-14-19, 09:28 AM
  #32  
burn to burn
iTrader: (3)
 
keithrulz's Avatar
 
Join Date: May 2005
Location: Rochester, IN
Posts: 1,601
Thanked 2 Times in 2 Posts
Originally Posted by keithrulz View Post
Are your signals still noisy on ACC without cranking and without the engine running?
Could you address this?
keithrulz is online now  
Old 01-14-19, 10:49 PM
  #33  
Full Member
Thread Starter
 
ApexHunter's Avatar
 
Join Date: Nov 2010
Location: ---US---
Posts: 70
Thanks: 0
Thanked 0 Times in 0 Posts
It looks like there is still some noise when the car is just sitting on ACC. ECU fluctuates about 0.5 degrees here and there. I attached a log as well.

Semi related, should I be installing some sort of restrictor pill on the vacuum line to the MAP sensor ?
Attached Files
ApexHunter is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
keithrulz
Megasquirt Forum
4
10-30-18 01:05 PM
Turtle13
2nd Generation Specific (1986-1992)
24
01-29-13 10:24 AM
monjack
General Rotary Tech Support
2
02-20-09 01:55 PM
10AEFC
General Rotary Tech Support
1
06-16-08 02:56 AM
va creeper
2nd Generation Specific (1986-1992)
8
03-03-08 10:50 AM


Thread Tools
Search this Thread
Quick Reply: Turbo 13B w/MS3Pro: Fires up for a second then dies after fixing MAP signal


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: