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View Full Version : another sr20 no spark issue

NOLAG
10-30-2011, 07:58 PM
long story short me and my buddy have been trying to trouble shoot why his car has only been running on cylinder's 1 and 3......this all happened after we swaped the motor from one s13 to another...we changed the fuel rail,intake mani to a freddy,cas (thinking it was timing)...the whole 9....so tonight my another froend with an sr comes by we checked every thing then we try one last thing....we take the coil pack sub harness out of my friends car (whos running on 2 cylinders)into the sr which is running and gave somewhat of the same symptoms..now my question is ...i checked continuity with a BS tester and it seemed to look ok ..could the signal be just good enough to make the light go on in the tester pen?and no a strong enough signal for the other 2 cylinders? were stumped any help would be greatly appreciated

(the kid with the running sr didnt want to put his harness in just incase for some reason it shorted out due to him having a 20 mile drive home)
NOLAG
10-31-2011, 10:29 AM
Anyone ? Trying to figure this out today thanks
s13envy
10-31-2011, 10:41 AM
Check your grounds

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NOLAG
10-31-2011, 01:27 PM
Where should it be grounded to exactly should I add an extra?
2.5T_/<ouki
10-31-2011, 01:32 PM
Happened to a buddy of mine. Turned out that the ECU had gone bad.
Fresh2Death
10-31-2011, 01:32 PM
Its simple, get a new coil pack harness for a wopping $40... its a grounding issue. maybe try a different ECU. seen it fixed both ways, but its usually the ECU
SlideOrDie831
10-31-2011, 01:57 PM
grounding problems or bad ecu. check your ignitor also.
JSimpson
10-31-2011, 01:58 PM
the ECU grounds the coils. Try new ECU for sure, and get a new/different coil pack harness fo sho
s13envy
10-31-2011, 02:28 PM
the ECU grounds the coils. Try new ECU for sure, and get a new/different coil pack harness fo sho

There is also a ground in the coil pack harness that grounds to the back of the head

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NOLAG
11-01-2011, 07:08 AM
Ok cool ordering a new coil pack harness tonight ...also is there away to test the ecu for bad grounds ?and if anyone has either a coil pack harness or ecu forsale let me know thanks !!
kalypso123
11-01-2011, 07:17 AM
put your coil pack sub-harness in his car... have you tried that?

and then check ALL YOUR grounds. especially if it was working before.