Rpm dip/high idle/intermittent hesitation ms2 problem
#1
Junior Member
Thread Starter
Join Date: Mar 2014
Location: Edmond, Oklahoma
Posts: 123
Total Cats: -46
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
RPM DIP:
I am having an issue with my miata dipping at initial throttle by about 300 rpm. I have been reading a lot online and had this problem for a very long time and i decided someone smarter than me could hopefully replace my ignorance with knowledge. When i barely push the throttle initially every time my AFR goes to 10 and i lose 300 rpm. This started happening after a wells201 install. I am thinking it could be my acceleration enrichment but I am not sure.
HIGH IDLE:
I read that after installing a vtps all idle issue were fixed but this wasn't the case for me. I put it to openloop (warmup only) and it stays at 2k rpm. (possibly a bad IAC?) I change it to closed loop and it goes to 1500 rpm but in megalogviewer it shows my requested rpm is 800 then 0 then 800 then 0 over and over. I am not sure what is going on here.
HESITATION ISSUE:
I think this has to do with the RPM dip. When at low rpm/speed while trying to keep a steady rpm or slightly increasing rpm the car intermittently stutters and i believe it is getting too much fuel at that moment.
Please if anyone can chime in I would greatly appreciate it. I have attached a datalog and my tune.
https://drive.google.com/file/d/19-K...ew?usp=sharing
https://drive.google.com/file/d/1Pfy...ew?usp=sharing
I am having an issue with my miata dipping at initial throttle by about 300 rpm. I have been reading a lot online and had this problem for a very long time and i decided someone smarter than me could hopefully replace my ignorance with knowledge. When i barely push the throttle initially every time my AFR goes to 10 and i lose 300 rpm. This started happening after a wells201 install. I am thinking it could be my acceleration enrichment but I am not sure.
HIGH IDLE:
I read that after installing a vtps all idle issue were fixed but this wasn't the case for me. I put it to openloop (warmup only) and it stays at 2k rpm. (possibly a bad IAC?) I change it to closed loop and it goes to 1500 rpm but in megalogviewer it shows my requested rpm is 800 then 0 then 800 then 0 over and over. I am not sure what is going on here.
HESITATION ISSUE:
I think this has to do with the RPM dip. When at low rpm/speed while trying to keep a steady rpm or slightly increasing rpm the car intermittently stutters and i believe it is getting too much fuel at that moment.
Please if anyone can chime in I would greatly appreciate it. I have attached a datalog and my tune.
https://drive.google.com/file/d/19-K...ew?usp=sharing
https://drive.google.com/file/d/1Pfy...ew?usp=sharing
#3
Junior Member
Thread Starter
Join Date: Mar 2014
Location: Edmond, Oklahoma
Posts: 123
Total Cats: -46
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I did calibrate it but it still shows negative numbers for some reason. I spliced into factory ground from the on/off tps. I read that a negative vtps reading could be from not grounding to the megasquirt. I will try that and see if that does anything.
#4
Junior Member
Thread Starter
Join Date: Mar 2014
Location: Edmond, Oklahoma
Posts: 123
Total Cats: -46
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I cut the crimps on the wires on my Wells201 tps and soldered them instead. The value now shows +20 instead of negative 20. This still isn't perfect but it doesn't dip the rpm anymore. I figured out the high idle issue as well after realizing that my values for my fully warm coolant temp was at 71. I put it down into the 30s and now i have an idle of 900 ish. This brought up the fact that my idle was too lean at that point in the table so i adjusted the values and it is pretty close to always 14.7. I haven't gotten a chance to check on the hesitation issue but i think the tps fix worked.
Thread
Thread Starter
Forum
Replies
Last Post
Carloverx
Engine Performance
24
04-01-2017 12:49 PM
compuw22c
MEGAsquirt
18
10-13-2015 04:22 PM