cpgreen7787 Posted May 4, 2020 Share Posted May 4, 2020 good afternoon to you all and hope everyone is doing well, my 1993 na auto is currently unable to start and according to 2 different in line spark testers i have no spark. i have 12v at the coil and I've tried another coil which i had spare because I've heard they can be a bit of an issue. history - this started about about 2 years ago when it just cut out on me and never started again, i had a look in to it but it was turning into a big job so due to work commitments i had to store it for a bit then about 8 months ago i started looking into it again and thanks to a suggestion from the Facebook group i found my ECU was burnt and damaged so i had it repaired, thanks to this lock down I've had time refit the repaired ecu and change the cambelt but it still wont start. I love this car but it's really starting to drive me crazy, any tips or suggestion would be greatly appreciated Quote Link to comment Share on other sites More sharing options...
Scooter Posted May 4, 2020 Share Posted May 4, 2020 I think you need to swap in a known working ECU and go from there? No chance of the cambelt being out (did you mess much with the cams or crank or just pop a new one pretty much straight on?) Quote Link to comment Share on other sites More sharing options...
Scooter Posted May 4, 2020 Share Posted May 4, 2020 Not always easy to find but in the "Home" page (top left lef tof the Forum page) there are pdf's of the workshop manuals which might help. http://www.mkivsupra.net/vbb/content.php?61-Diagnostics I have paper copies but not with me currently although can look up the troubleshooting parts for the NA at some point if needs be. Quote Link to comment Share on other sites More sharing options...
Noz Posted May 4, 2020 Share Posted May 4, 2020 Have you got a signal from the ECU to the ignitor? Sometimes the ignitor isn't great. As well as the worn coil Quote Link to comment Share on other sites More sharing options...
rider Posted May 4, 2020 Share Posted May 4, 2020 Have you checked the resistance of your coil? No resistance and its no good. Here is a link to the ignition system inspection guide Quote Link to comment Share on other sites More sharing options...
absz Posted May 4, 2020 Share Posted May 4, 2020 NA Supra's have the crank pulse sensor built into the distributor which controls spark. when cranking over the engine see if you can spot the rev counter needle bouncing slightly as that's from the crank signal. Quote Link to comment Share on other sites More sharing options...
evinX Posted May 4, 2020 Share Posted May 4, 2020 Igniter module - the bracket is the earth, when they go rusty the car wont start ECU - bad ecu can cause the NA not to start and the na auto ecus worldwide seem to be on their last legs due to age Imo i have a feeling its the ecu on this one Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted May 5, 2020 Share Posted May 5, 2020 You said the ECU has been out, check all the plugs are in properly in that area. Also check simple things like fuses. The cars aren't that complicated and its bound to be something simple, chin up! Quote Link to comment Share on other sites More sharing options...
cpgreen7787 Posted May 6, 2020 Author Share Posted May 6, 2020 hi all thanks for the replies, i had the ecu repaired and the company that did it seemed very confident that it would work fine but i agree that it seems likely that the ecu is still faulty. i checked all of the fuses and they are fine, i even replaced some that had tarnished blades. i replaced the coil but i didnt think about cleaning the bracket so i'll do that. i replaced the cam belt but i was very careful and i manually turned over the engine a few times and checked the timing and tension. i think i need to try and get hold of a spare ecu, even if it turns out to be something else it seems like i may need one in the near future. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted May 6, 2020 Share Posted May 6, 2020 Did you double check all the timing marks when you did the belt? Quote Link to comment Share on other sites More sharing options...
cpgreen7787 Posted May 8, 2020 Author Share Posted May 8, 2020 yes, i even put an extension in cylinder 1 to make sure the crank marks are ok. Quote Link to comment Share on other sites More sharing options...
cpgreen7787 Posted May 8, 2020 Author Share Posted May 8, 2020 i just found an auto ecu for sale so hopefully i'll be back up and running soon, i'll post an update when it arrives and I've tried it. Quote Link to comment Share on other sites More sharing options...
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