ben_harmer32 Posted August 2, 2021 Share Posted August 2, 2021 (edited) My friend has a misfire on his Supra at idle and when driving. We changed all the spark plugs and swapped out the coil packs with no change. Clips are fairly new. We disconnected each coil pack so we could localise the misfire, it's in cylinder 6 (back of engine) Then decided to use another coil pack with a spark plug in it and checked each cylinder (so we could visually see the spark) and we got a spark on each. Any ideas what else we can try please or what might be causing the issue? Edited August 2, 2021 by ben_harmer32 (see edit history) Quote Link to comment Share on other sites More sharing options...
evinX Posted August 2, 2021 Share Posted August 2, 2021 Tt auto or manual? If its a tt auto dosent the ecu have pins for each coil? And the amount of auto ecus failing recently id suspect that to 1 Quote Link to comment Share on other sites More sharing options...
ben_harmer32 Posted August 2, 2021 Author Share Posted August 2, 2021 3 minutes ago, evinX said: Tt auto or manual? If its a tt auto dosent the ecu have pins for each coil? And the amount of auto ecus failing recently id suspect that to TT auto. But all coils are sparking so guessing it's possibly a fuelling issue? It has lots of smoke if try and rev it. Quote Link to comment Share on other sites More sharing options...
Ric Posted August 2, 2021 Share Posted August 2, 2021 The oil seals for the cam covers can leak on the 6th cylinder. Perhaps the spark plug well is full of oil or it's getting into the cylinder. Im sure you'd have noticed that when removing the plugs mind. Could be a dead injector. 1 Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted August 2, 2021 Share Posted August 2, 2021 Fuel issue or low compression. If its oil smoke then that could be the cause. What does the spark plug look like when you pull it out? 1 Quote Link to comment Share on other sites More sharing options...
ben_harmer32 Posted August 2, 2021 Author Share Posted August 2, 2021 7 minutes ago, Swampy442 said: Fuel issue or low compression. If its oil smoke then that could be the cause. What does the spark plug look like when you pull it out? Spark plug was clean. Was working fine the day before. Car is rarely used and never pushed hard. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted August 2, 2021 Share Posted August 2, 2021 Clean as in dry or clean as in wet? If its misfiring but not wet thats a fuel problem. If its wet then its ignition or compression. Have you tried a different ignitor? Having a spark is no guarantee its a quality spark 1 Quote Link to comment Share on other sites More sharing options...
ben_harmer32 Posted August 2, 2021 Author Share Posted August 2, 2021 Clean as in no oil. Was also completely dry. We did ignitor as well, swapped it with another. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted August 2, 2021 Share Posted August 2, 2021 Dry is no fuel, thats part of the problem, stock ECU? 1 Quote Link to comment Share on other sites More sharing options...
ben_harmer32 Posted August 2, 2021 Author Share Posted August 2, 2021 5 minutes ago, Swampy442 said: Dry is no fuel, thats part of the problem, stock ECU? Yes stock ECU. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted August 2, 2021 Share Posted August 2, 2021 Id maybe try a different ECU if you can find one, it could be on its way out 1 Quote Link to comment Share on other sites More sharing options...
ben_harmer32 Posted August 3, 2021 Author Share Posted August 3, 2021 So we unplugged the injector to see if it was getting power, all was fine. Plugged it back in and everything is working perfectly. Must have been a loose connection on that plug! 2 Quote Link to comment Share on other sites More sharing options...
Tyson Posted August 3, 2021 Share Posted August 3, 2021 7 minutes ago, ben_harmer32 said: So we unplugged the injector to see if it was getting power, all was fine. Plugged it back in and everything is working perfectly. Must have been a loose connection on that plug! Always nice when it is a relatively easy fix! 1 Quote Link to comment Share on other sites More sharing options...
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