lukEp Posted December 1, 2017 Share Posted December 1, 2017 So driving to work on Thursday and my car starts misfiring bad, no power and neat fuel spewing out the exhaust!! So I abandon the car to sort out after work..... I Checked plugs and leads all good, with the amount of fuel coming from exhaust while running my thought is injector stuck open. After Investigating my problem was cylinder 2 and 4 injectors are constantly open. I disconnect my HKS PFC and actuator, plug just stock ECU in and it runs perfect. I've come to the conclusion that the injector driver on the HKS has gone bad probably because the ECU is 25+years old now and the cold we've had has just made the driver give up, resulting in a permanent ECU ground to 2 and 4 injectors (one driver for both as it's batch fire) anyone else had the similar problem and is there anyone with a busted HKS PFC that wants to part with it so I can recycle some components out of it. Quote Link to post Share on other sites
maddox710 Posted December 1, 2017 Share Posted December 1, 2017 id probably say that the mosfets on the pcb have probably give up the ghost, you could take it apart and replace them yourself if your pretty savvy with soldering iron Quote Link to post Share on other sites
lukEp Posted December 2, 2017 Author Share Posted December 2, 2017 (edited) When I say driver I mean the mosfet/driver/transistor, I'm pretty sure when I had the lid off last they had no marking on them or they have been scratched/attacked with a dremel, which is why a busted one for parts would be ideal. I'll get it out of the car tomorrow and get the lid off to confirm. Edited December 2, 2017 by lukEp Quote Link to post Share on other sites
maddox710 Posted December 2, 2017 Share Posted December 2, 2017 You will have to probe them too tell they don’t often show visible signs they are gone Quote Link to post Share on other sites
turbominicooper Posted December 3, 2017 Share Posted December 3, 2017 Are you wanting to buy another one? Quote Link to post Share on other sites
lukEp Posted December 4, 2017 Author Share Posted December 4, 2017 I can buy the mosfets for £4.50 each so I'll just replace all 4. One is faulty as I've now tested them Quote Link to post Share on other sites
maddox710 Posted December 4, 2017 Share Posted December 4, 2017 3 minutes ago, lukEp said: I can buy the mosfets for £4.50 each so I'll just replace all 4. One is faulty as I've now tested them Nice work dude Quote Link to post Share on other sites
Calum122 Posted December 4, 2017 Share Posted December 4, 2017 Yeah I was going to say, it's possible that it's just a cheap component gone faulty. There are engineers that could no doubt fix it, cheaper than another one. Quote Link to post Share on other sites
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