1990 240sx S13 Rough start and idle
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- čas přidán 25. 09. 2023
- In the video featuring my 1990 twin cam 240sx I attempt to diagnose the rough start, rough/low idle, and backfire. This is the first 240sx video on the channel and I’m excited for the future of this car. Stay tuned for future videos of this car!
Hey bro my 240sx has the exact same symptoms at the moment . Did you ever figure it out ?
Yeah basically I figured out 2 cylinders weren’t firing like at all, I replaced the spark plugs, checked the spark plug wires, retimed the distributor (because there’s a pin that can fall out causing it to lose timing) , did a compression test, switched injectors. It turned out to be a bad ecu. Got an eBay one and it fixed it right away. I figured it out by testing the voltage to the injectors while it was running and the 2 cylinders that were working were pulsing 12 volts on a multimeter and the 2 that weren’t working just got constant 12 volts. Wiring was all good so that’s all it could be. Something simple like a bad valve cover gasket could cause oil to get into the spark plugs causing them to fowl. Bad maf sensor typically puts 240s into limp mode and that wasn’t the problem looking back. Hope you figure it out
Could also be a vacuum leak check the intake for Lose lines that will cause a rough idle too
So glad to hear you solved it after all , these are some great points I hadn’t thought of checking initially. Definitely going to take a look this weekend and try to start locating the culprit of mine. Thanks for getting back to me with this info and so soon ! Hope to see you post more in the future 👍🏻