running on two cylinders after 1.8 swap - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 04-16-2011, 11:50 PM   #1
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2008
Location: Evansville, Indiana
Posts: 314
Total Cats: 0
Default running on two cylinders after 1.8 swap

i swapped a fresh 1.8 into my '93 miata over the winter. It now runs on two cylinders. new plugs and wires. i bought a new to me set of coils that i was told were good, still only have spark on 1 & 4. only thing i could think of was the extension to my CAS wiring, but i soldered them, and they all looked fine when i went back and checked them.


anyone have any ideas?
DrewLGT is offline   Reply With Quote
Old 04-16-2011, 11:57 PM   #2
Elite Member
 
Join Date: Feb 2008
Location: Victoria, BC
Posts: 2,322
Total Cats: 12
Default

I would think it is your coils. Or your igniter.
dustinb is offline   Reply With Quote
Old 04-17-2011, 12:01 AM   #3
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2008
Location: Evansville, Indiana
Posts: 314
Total Cats: 0
Default

i know...

i already bought a used set of coils, i hate to keep throwing money at them. i wish there was someone local with a set i KNEW was good.

would a bad ignitor fire one coil and not the other?
DrewLGT is offline   Reply With Quote
Old 04-17-2011, 05:49 PM   #4
Elite Member
iTrader: (3)
 
Join Date: Mar 2008
Location: Granbury, TX
Posts: 6,009
Total Cats: 583
Default

I know this is basic . . . but . . .

Double check that your plug wires are routed correctly. IIRC, the routing differs between the 1.6 and 1.8.

You'd be surprised (well, maybe not) how many times this has bitten me whenever I've changed plug wires or coils.
hornetball is offline   Reply With Quote
Old 04-17-2011, 07:31 PM   #5
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2008
Location: Evansville, Indiana
Posts: 314
Total Cats: 0
Default

I'm pretty sure it's right. Even if they aren't, wouldn't it still send a spark. Just at the wrong time?
DrewLGT is offline   Reply With Quote
Old 04-17-2011, 09:12 PM   #6
AFM Crusader
iTrader: (18)
 
olderguy's Avatar
 
Join Date: Oct 2004
Location: Wayne, NJ
Posts: 4,438
Total Cats: 84
Default

Are you using all of the original coils, ignitor, cas, same plug wiring as 1.6 with 1.6 coils? Or, did you swap in something 1.8?
olderguy is offline   Reply With Quote
Old 04-17-2011, 09:18 PM   #7
Elite Member
iTrader: (24)
 
Join Date: Jul 2007
Location: Cypress, TX
Posts: 3,778
Total Cats: 35
Default

I have ruined (flooded) plugs due to the wires being routed incorrectly after cranking for awhile. That could cause the lack of spark. Triple check your wire routing. Just for kicks, I would try switching 1 and 4 with 2 and 3.
Bryce is offline   Reply With Quote
Old 04-17-2011, 10:01 PM   #8
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2008
Location: Evansville, Indiana
Posts: 314
Total Cats: 0
Default

Quote:
Originally Posted by olderguy View Post
Are you using all of the original coils, ignitor, cas, same plug wiring as 1.6 with 1.6 coils? Or, did you swap in something 1.8?
same ignitor, and CAS. new plugs and wires. i bought a used set of coils i was told were good already.
DrewLGT is offline   Reply With Quote
Old 04-17-2011, 10:03 PM   #9
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2008
Location: Evansville, Indiana
Posts: 314
Total Cats: 0
Default

btw, i checked for spark, with the car running, with a timing light on each plug wire. so that rules out plugs, wrong firing order etc.
DrewLGT is offline   Reply With Quote
Old 04-17-2011, 10:20 PM   #10
Senior Member
iTrader: (22)
 
Join Date: Oct 2007
Location: bay area, ca
Posts: 551
Total Cats: 19
Default

Stuck injector(s)? When I was de-turbo'ing my 1.8 I put my old tan top injectors back in that I had cleaned over a year ago. Two of them were stuck which I fixed by lightly tapping on them with a mallet. A 9V battery is a good way to test the injector out of the car. You should hear a click. Two of mine didn't click till I whacked them a few times.
orion4096 is offline   Reply With Quote
Old 04-17-2011, 10:25 PM   #11
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2008
Location: Evansville, Indiana
Posts: 314
Total Cats: 0
Default

Quote:
Originally Posted by orion4096 View Post
Stuck injector(s)? When I was de-turbo'ing my 1.8 I put my old tan top injectors back in that I had cleaned over a year ago. Two of them were stuck which I fixed by lightly tapping on them with a mallet. A 9V battery is a good way to test the injector out of the car. You should hear a click. Two of mine didn't click till I whacked them a few times.


i know that i'm not getting any spark on two or three. i checked all four injectors and heard them clicking away while the car was running.
DrewLGT is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
01-05 Fab9 PNP COPs (used) FrankB Miata parts for sale/trade 6 09-30-2015 12:48 PM
wiring wideband ground to battery terminal btabor ECUs and Tuning 10 09-28-2015 06:33 PM
VR6 to Miata Swap ScrapinMX5 Meet and Greet 8 09-28-2015 02:04 PM
BP-6D on CAS only aidandj MEGAsquirt 14 09-25-2015 06:26 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 11:20 AM.