It runs, but only on cyl 1 and 3? any ideas? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 07-22-2008, 11:13 AM   #1
Junior Member
Thread Starter
 
Join Date: Feb 2008
Posts: 62
Total Cats: 0
Default It runs, but only on cyl 1 and 3? any ideas?

I am getting the engine to run on 1 and 3 but nothing on 2 and 4, and no tack inside the car.(no biggie, if the thing runs i will be happy to fix the tach )

Ive replaced spark plugs(a few times),
checked for spark(spark on all four),
compression test(150-125-150-125),
changed the fuel in the tank,
played with the timing(now sitting at 72 degrees trigger angle),

i am running a V3 ms1, with dual vb921's direct drive to GM coil packs, using the input mods from DIYAT, and a relay board using DIY's relay harness, the rest of the engine wiring has been replaced due to previous Haltech E6k install, turbo, external boost controller, aftermarket fans,

I am using the MSpnp 96-97 msq file to get started. with the necessary changes for spark output and req fuel,
jamiemiller is offline   Reply With Quote
Old 07-22-2008, 11:21 AM   #2
Elite Member
iTrader: (39)
 
Zabac's Avatar
 
Join Date: Sep 2007
Location: High Point NC
Posts: 4,854
Total Cats: 8
Default

What exactly are you doing with the ignition?

OBDII Miatas get tach from the ECU, so if you didn't mod your MS for it you will not have a tach signal.
Zabac is offline   Reply With Quote
Old 07-22-2008, 12:15 PM   #3
Junior Member
Thread Starter
 
Join Date: Feb 2008
Posts: 62
Total Cats: 0
Default

full standalone, running direct drive to gm coil packs, using the an NA cas, the MS is modded according to the DIY instructions, the tach signal works in megatune, just not on the stock tach in the dash.
jamiemiller is offline   Reply With Quote
Old 07-22-2008, 12:18 PM   #4
Junior Member
Thread Starter
 
Join Date: Feb 2008
Posts: 62
Total Cats: 0
Default

Last night i went through the schematics for the fuel injector section, to double check, everything is there and oriented correctly.
jamiemiller is offline   Reply With Quote
Old 07-22-2008, 12:21 PM   #5
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

post your map...
Braineack is offline   Reply With Quote
Old 07-22-2008, 12:23 PM   #6
Junior Member
Thread Starter
 
Join Date: Feb 2008
Posts: 62
Total Cats: 0
Default

ill get it posted.
jamiemiller is offline   Reply With Quote
Old 07-22-2008, 02:03 PM   #7
Junior Member
Thread Starter
 
Join Date: Feb 2008
Posts: 62
Total Cats: 0
Default

attached is the msq ivebeen trying to get the car to run on.
Attached Files
File Type: zip miata97msq.zip (5.7 KB, 39 views)
jamiemiller is offline   Reply With Quote
Old 07-22-2008, 02:09 PM   #8
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

4 injections per cycle eh?
Braineack is offline   Reply With Quote
Old 07-22-2008, 03:54 PM   #9
Junior Member
Thread Starter
 
Join Date: Feb 2008
Posts: 62
Total Cats: 0
Default

i was running it at 2 per cycle, then just to make sure i wasn't crazy i put it there to see if i was getting any fuel into the 2 and 4 cylinders.
jamiemiller is offline   Reply With Quote
Old 07-22-2008, 03:55 PM   #10
Junior Member
Thread Starter
 
Join Date: Feb 2008
Posts: 62
Total Cats: 0
Default

it actually idles on the map, only on two cylinders. amazingly rich i might add.
jamiemiller is offline   Reply With Quote
Old 07-22-2008, 03:58 PM   #11
Elite Member
iTrader: (3)
 
AbeFM's Avatar
 
Join Date: Aug 2006
Location: San Diego, CA
Posts: 3,048
Total Cats: 8
Default

Heh, ask joe - joe had some issue where only one injector bank was firing durring start up.

But it almost sounds like wiring. It's almost certainly fuel, since 1/4 are paired for spark, 1/3 for fuel.
AbeFM is offline   Reply With Quote
Old 07-22-2008, 04:01 PM   #12
Junior Member
Thread Starter
 
Join Date: Feb 2008
Posts: 62
Total Cats: 0
Default

injectors are wired to a relay board, inj1 is 2 and 4 and inj2 is 1 and 3.

high impedance 550cc rx7 injectors
jamiemiller is offline   Reply With Quote
Old 07-22-2008, 04:17 PM   #13
Elite Member
iTrader: (3)
 
AbeFM's Avatar
 
Join Date: Aug 2006
Location: San Diego, CA
Posts: 3,048
Total Cats: 8
Default

I guess you could check for the power feed to the cyl 2/4 or whatever one isn't working, make sure that's good.

If you have an oscilliscope y ou're golden, otherwise, try checking it on the STIM for flashing lights, or put a light (LED, etc) on the injector line and see if you get anything there. My guess is you're not powering the injector. If you are, then it's time to check the wiring.

And find Joe Perez (you can PM him with that name) figure out what happened to him. I think it was only on starting.

Does the MS KNOW you have a second set of injectors? I think this is really a issue to be solved with the stimulator and software.
AbeFM is offline   Reply With Quote
Old 07-22-2008, 04:23 PM   #14
Junior Member
Thread Starter
 
Join Date: Feb 2008
Posts: 62
Total Cats: 0
Default

both wires on all the injectors have 12v in ref to ground.

with the MS1extra firmware, i thought since there is no way to deactivate the second set of injectors, that both sets are working?
jamiemiller is offline   Reply With Quote
Old 07-22-2008, 04:30 PM   #15
Junior Member
Thread Starter
 
Join Date: Feb 2008
Posts: 62
Total Cats: 0
Default

https://www.miataturbo.net/forum/showthread.php?t=17031

found what joe perez was talking about, ill try it tonight.
jamiemiller is offline   Reply With Quote
Old 07-22-2008, 04:58 PM   #16
Elite Member
iTrader: (3)
 
AbeFM's Avatar
 
Join Date: Aug 2006
Location: San Diego, CA
Posts: 3,048
Total Cats: 8
Default

I'm a little sketchy on the MS-I details. There's a chance it's not configured right, and doesn't know which pin to put the fuel signal out on? Maybe someone more familiar with MS-I could suggest something. But certainly putting a light on there would help.

AND FIND SOMEONE WITH A STIM! There shouldn't even be an option to buy the stim or not.

Lastly, there's a SMALL chance you burned out the drivers if you have low ohm injectors.
AbeFM is offline   Reply With Quote
Old 07-22-2008, 05:31 PM   #17
Junior Member
Thread Starter
 
Join Date: Feb 2008
Posts: 62
Total Cats: 0
Default

i have the stim , ver 2.1 and it tested fine. there is no injector test on the stim that i have.

they are high impedance injectors.

would an led test light even be detectable by the human eye? for testing fuel injector outputs?
jamiemiller is offline   Reply With Quote
Old 07-22-2008, 05:31 PM   #18
Junior Member
Thread Starter
 
Join Date: Feb 2008
Posts: 62
Total Cats: 0
Default

Quote:
Originally Posted by AbeFM View Post
I'm a little sketchy on the MS-I details. There's a chance it's not configured right, and doesn't know which pin to put the fuel signal out on? Maybe someone more familiar with MS-I could suggest something. But certainly putting a light on there would help.

AND FIND SOMEONE WITH A STIM! There shouldn't even be an option to buy the stim or not.

Lastly, there's a SMALL chance you burned out the drivers if you have low ohm injectors.
how can you test the injector drivers?
jamiemiller is offline   Reply With Quote
Old 07-22-2008, 06:59 PM   #19
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,327
Total Cats: 1,926
Default

Quote:
Originally Posted by AbeFM View Post
There's a chance it's not configured right, and doesn't know which pin to put the fuel signal out on?
No. On the MS1, the two INJ channels are hard-coded. It's possible for INJ2 to be turned off, but not on the wrong pins. In addition to the stupidity I did which is linked to post 15 here, make sure that under Advanced, in the "Staged Injection" menu, Injector Staging Mode is set to OFF.

Quote:
Originally Posted by jamiemiller View Post
would an led test light even be detectable by the human eye? for testing fuel injector outputs?
At low RPM, yes. In particular, start the MS up with the stim RPM turned down to 0. Increase very slightly to about 200 RPM and observe both LEDs flashing together. Increase RPM to idle, and observe the two LEDs pulsing in sequence.

Quote:
Originally Posted by jamiemiller View Post
how can you test the injector drivers?
With a stim. Even the crappy Non-JimStim has LEDs to indicate the operation of INJ1 and INJ2.
Joe Perez is offline   Reply With Quote
Old 07-28-2008, 01:00 PM   #20
Junior Member
Thread Starter
 
Join Date: Feb 2008
Posts: 62
Total Cats: 0
Default

injectors are working, i swapped inj1 to inj2 and cylinder 1 and 3 still run great.

this has got me stumped.

next up, checking the injectors themselves. i measured the Z for them, they are 14.2 to 15 Ohms, i am going to switch them, see if it runs on 2 and 4.
jamiemiller is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 59 Yesterday 09:00 PM
Changing from 460cc to flow force 610cc in diypnp 90 Turbo MEGAsquirt 19 10-19-2015 04:23 PM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM
Bizarre connection issue? nick470 MEGAsquirt 1 09-30-2015 11:32 PM
Nuke Mars! Joe Perez Current Events, News, Politics 8 09-30-2015 05:41 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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 08:48 PM.