Pretty sure my car is possessed... - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 06-13-2016, 12:33 PM   #1
Junior Member
Thread Starter
 
Join Date: May 2011
Location: Signal Hill, CA
Posts: 246
Total Cats: 11
Default Pretty sure my car is possessed...

I was on my way to the tuner on Friday and ran into a kind of weird issue (first time it has ever happened). I was on the freeway and ran into some light stop and go traffic when I noticed that my car wasn't accelerating and my rpm slowly coming down, good thing I was in the slow lane and was able to pull over on the shoulder.

The car would start but will not idle. I sat there for a good 10 minutes trying to start before I gave up and called a tow truck. About 20 minutes the car would fire up and idle correctly. I was able to make the 45-minute drive home w/o any issues.

TL;dr: Car dies and would start up again after some time has passed.

Info on the car:
1992
MS3X
Stock 1.6 ( I know... I know)
FF 610cc Injectors
DW200 fuel pump
Sequential injection
stock ignition setup
NGK range 7 spark plugs (tuner told me to gap them at .024")

Potential causes:
Bad ignitor
Bad CAS
Bad Fuel pump
Bad ground
Fuel pump relay
Main relay

What I checked:
Ignitor - Didn't know how to check this, but I assumed it was good because I was still getting a tach signal?
CAS - Did a datalog on the way home and did not see any sync errors.
Fuel pump - I haven't had a chance to open up the gas tank, but I hear it prime. (any way to log to see if the fuel pump is bad?)
Ground - Didn't see any loose ground wires.
Fuel pump relay - haven't gotten around to check this yet
The main relay - haven't gotten around to check this yet

That's all I could come up with, anyone have any other ideas? Criticism?
.one lane is offline   Reply With Quote
Old 06-13-2016, 05:13 PM   #2
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,192
Total Cats: 2,583
Default

often it's the cas, the fact that it's sync'd when working right doesn't rule it out
18psi is offline   Reply With Quote
Old 06-13-2016, 08:14 PM   #3
Newb
 
Join Date: Nov 2015
Location: Melbourne, Australia
Posts: 8
Total Cats: 0
Default

Could be MAT sensor heatsoak/tuning. My car wanted to pull fuel on hot start because the MAT sensor wasn't tuned properly and was heatsoaking like a b*tch. It started but revs would drop and stall unless I feathered the throttle, and letting the car cool down would fix it.
Do you have an AFR log of it happening?
smy0003 is offline   Reply With Quote
Old 06-13-2016, 08:39 PM   #4
Junior Member
Thread Starter
 
Join Date: May 2011
Location: Signal Hill, CA
Posts: 246
Total Cats: 11
Default

I would have to go through my logs and see what the afr readings were at, but I don't think it's a heat soak issue ( I could be wrong). The car would start but will not idle and whenever I stepped on the gas the rpms wouldn't go up.

I'll post the log when I get off work. (remember this isn't tuned, so the log is all over the place)
.one lane is offline   Reply With Quote
 
 
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 08:30 AM.