3rd Generation Specific (1993-2002) 1993-2002 Discussion including performance modifications and Technical Support Sections.
Sponsored by:

T1 plug sparks in test, not in running motor...

Thread Tools
 
Search this Thread
 
Old Feb 1, 2011 | 06:55 PM
  #1  
DK's Avatar
DK
Thread Starter
40k worth of fail
Tenured Member 20 Years
iTrader: (5)
 
Joined: Mar 2001
Posts: 1,312
Likes: 0
From: Hermosa Beach, CA
T1 plug sparks in test, not in running motor...

Car stats: Power FC, stock ignition, stock fuel system, non-seq, large streetport

Symptoms: Thumpier than usual idle, throwing visible gas vapor from tailpipe (incomplete burn), T1 plug is wet (not firing). T1 plug shows spark when pulled from the block & grounded (when dry). The car had rough starts for a few months leading up to this with a bouncing idle for a couple of minutes before smoothing out... didn't stall dropping to idle, though. (At the time, I figured the Power FC was just making some adjustments.)

What I've tried: Tested/confirmed continuity across T1 circuitry all the way back to Power FC, swapped Power FC for stock ECU, swapped T1 coil & igniter, grounded all plugs testing spark, swapped wires, swapped T2 coil checking spark, etc.

It just hit me as I wrote this post that this is likely a leaky/open injector on R1 that is washing out the T1 plug as the car attempts to start. The "final straw" from the rough starts that caused me to tow it home was it starting on one rotor, which likely means the leaky injector washed out both R1 plugs before the car started.

Right??

(Also something weird discovered in this process... my car runs with the fuel pump relay pulled and I cannot fathom why.)
Reply
Old Feb 4, 2011 | 02:41 PM
  #2  
DK's Avatar
DK
Thread Starter
40k worth of fail
Tenured Member 20 Years
iTrader: (5)
 
Joined: Mar 2001
Posts: 1,312
Likes: 0
From: Hermosa Beach, CA
I'm just gonna post this here for the future reference of others since no one responded. (What happened to the people who actually knew the rotary around here??)

I took the injectors to RC Engineering and indeed, one of the primaries was "dripping" before service. Like a dummy, I didn't actually mark which ones came from the front rotor, so I'm only left to assume I was correct. Now they're all clean and flowing within 1cc of their rating.

I have a couple more maintenance things to do before I know if this was 100% the issue.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
trickster
2nd Generation Specific (1986-1992)
25
Jul 1, 2023 04:40 PM
efini7
Test Area 51
1
Sep 4, 2015 02:59 AM
elfking
3rd Generation Specific (1993-2002)
3
Aug 19, 2015 09:48 PM
Joe428
1st Generation Specific (1979-1985)
16
Aug 19, 2015 06:24 PM




All times are GMT -5. The time now is 11:38 AM.