smelllikefumes Posted September 15, 2017 Share Posted September 15, 2017 Cross post from troubleshooting Hello, I went to drive my car to the gym this morning I it is running horribly. Yesterday it ran perfectly fine, built boost seemed normal. It starts normally, but then starts to get slightly choppy and when I rev it it wont go past 2k rpm and is sputtering and popping all over. I have a wideband 02 sensor installed and when I start to rev the engine, the gauge goes crazy and reads its maximum (- - -). I disconnected the 02 gauge last night when trying to mount it a different location, but I thought that had nothing to do with the engine since I'm running a stock 83 engine and management system. (Previous owner was about to megasquirt, but sold it before finishing). I disconnected this connection and tried to rev the engine and seemed to be running early identical to when it was connected (barely at all at rpm): https://imgur.com/a/q7at5 Small Streamable link (44 sec): https://streamable.com/nzztz Quote Link to comment Share on other sites More sharing options...
ZHoob2004 Posted September 15, 2017 Share Posted September 15, 2017 When you say the wideband reads its maximum value, do you mean it was all the way rich <10:1, or all the way lean >20:1? If it's rich, I'd start with the ignition system and distributor, if it's lean I'd start with the fuel pump, filter and regulator. Quote Link to comment Share on other sites More sharing options...
smelllikefumes Posted September 15, 2017 Author Share Posted September 15, 2017 Sorry should of clarified that. Its running very lean. I believe you're right about it being the ignition system. My distributor cap and rotor are less than 3 years old so I wouldn't think that would be a problem. When I parked it yesterday it ran normally. It rained overnight and the problem seemingly came out of nowhere. I'll check the cap and rotor now. Quote Link to comment Share on other sites More sharing options...
ZHoob2004 Posted September 15, 2017 Share Posted September 15, 2017 If it's running very lean, it's not getting enough fuel, but it's probably igniting alright. check all your injector connections as well as the injector resistor packs. If the problem is appearing right after it rained, I'm suspecting something electrical. Quote Link to comment Share on other sites More sharing options...
smelllikefumes Posted September 15, 2017 Author Share Posted September 15, 2017 SOLVED!! Was a wet Throttle Position Sensor (or valve). Removed it and ran compressed air through the opening and now the motor runs fine. Quote Link to comment Share on other sites More sharing options...
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