Need help trouble shooting misfire. - Miata Turbo Forum -Boost cars, acquire cats.

Welcome to   Members

DIY Turbo Discussion greddy on a 1.8? homebrew kit?

LinkBack Thread Tools
Old 03-07-2010, 09:24 AM   #1
Thread Starter
iTrader: (1)
Join Date: Apr 2009
Posts: 40
Total Cats: 0
Default Need help trouble shooting misfire.

I've put the turbo kit back in August of last year, didn't get it to run, called it quits and left the car up until now when the weather is getting nice in NY and I'd like to have a running car again.

Kit is a Greddy 15G
MS was build build by Braineak with MAF elimination, base map for 470cc injectors

IAC is tapped, EGR blocked off, IAT is tapped after the IC, vacuum lines run, but the car is misfiring on two cylinders and sounds like a heavily cammed V8 when started and barely holds idle with smoke going everywhere (pretty sure just blowby the exhaust gasket).

After looking futher into the MS I'm pretty sure there is a cross in the wiring somewhere and I gave it to the local MS guru here to look into.

Now here is the question, while the MS is being messed around with, I want to make sure that everything else is fine and try to start the car with the stock ECU just to narrow it down to the MS.

I'll find the place to run the stock MAF sensor and throw that in somehow but my question is, will the car start with the bigger injectors or should I throw the stockers back inthere?
Vovchandr is offline   Reply With Quote
Old 03-07-2010, 11:05 AM   #2
Elite Member
Join Date: Feb 2008
Location: Victoria, BC
Posts: 2,322
Total Cats: 12

It will probably start but not idle.
dustinb is offline   Reply With Quote
Old 03-07-2010, 10:59 PM   #3
Senior Member
iTrader: (14)
Join Date: Aug 2008
Location: Tinley Park, IL
Posts: 1,488
Total Cats: 0

I might even idle...poorly. I give it 45 seconds before it floods, fouls the plugs and dies an untimely death.
lordrigamus is offline   Reply With Quote
Old 03-07-2010, 11:08 PM   #4
Cpt. Slow
iTrader: (24)
curly's Avatar
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 11,618
Total Cats: 463

My MS barely ran with a 265cc map and 460cc injectors installed. But it was enough to get the alternator spinning to charge the battery, my ac adaptor, laptop, and finally enable me to change my required fuel.

Why, may I ask, are you blaming someone who has built no doubt 100's of megasquirts before even consulting him?
curly is offline   Reply With Quote
Old 03-08-2010, 12:04 AM   #5
Thread Starter
iTrader: (1)
Join Date: Apr 2009
Posts: 40
Total Cats: 0

Because making mistakes is just part of statistics.

I'm not sure on the MS itself but the wiring looked funny.

Also when I would plug it in, depending on the angle of the MS to the wiring harness or the pressure on the harness the middle light would either be ON/OFF/ or DIM.

The harness didn't look too healthy either. That is how I got it.

So looks like I'll throw the stock injectors back in, put the MAF back in, stock ECU and make sure the car can start like that to the best of it's ability, eliminating IAC, EGR, Coils, wiring, plugs, etc as a potential issue.

Would blocked off EGR cause me any issues with stock ECU?

I'll also make sure that it my TPS no longer activates the radiator fan relay. I still have no idea how the hell that happened.
Vovchandr is offline   Reply With Quote
Old 03-08-2010, 12:13 AM   #6
Elite Member
iTrader: (7)
Join Date: Jul 2009
Location: Gainesville,Fl
Posts: 3,354
Total Cats: 5

Originally Posted by Vovchandr View Post

Would blocked off EGR cause me any issues with stock ECU?
I just got the light. But maybe it could. Its awesome to the see the light gone with ms.

Good luck.
turotufas is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
MS PNP requires reading and following directions??? satisfied MEGAsquirt 141 10-06-2015 10:44 AM
Cannot set Base Timing to 10* Elfering MEGAsquirt 50 10-05-2015 08:04 AM
WTB Stock NB Pistons pdexta WTB 0 09-28-2015 11:18 AM
Recommended Tire Temp for best friction thumpetto007 Race Prep 4 09-27-2015 05:16 PM
TPS based AFR map for better mileage (?) elior77 MEGAsquirt 30 09-23-2015 06:38 PM

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 On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 11:10 AM.