trwebb26 Posted June 6, 2006 Share Posted June 6, 2006 Admin's... I know this is a double post (it is in the MS forum, too). I'm not getting much help in the MS forum - and I don't think it is a Megasquirt problem... Just a motor problem. I've got a stock 78' 280z with MS&SE running 3.0 hardware & 3.0 bar map sensor. I'm running the 83' turbo dizzy and 240sx tb. I'm running the aeromotive FPR with idle (800rpm & 38kPa) at 36psi. Stock 19 lb injectors. The car idles great... but when I step on the go-pedal it gets up to ~2500 rpm and really sputters, coughs, backfires, etc. What could cause it? Thanks! Quote Link to comment Share on other sites More sharing options...
Mr.INSANE Posted June 6, 2006 Share Posted June 6, 2006 Timing? Quote Link to comment Share on other sites More sharing options...
Clifton Posted June 6, 2006 Share Posted June 6, 2006 Lean will cause backfiring through the intake. Are you tunning with a wideband, I hope? Quote Link to comment Share on other sites More sharing options...
trwebb26 Posted June 6, 2006 Author Share Posted June 6, 2006 Yup... wideband installed. I figured it out... i'm getting WAY too much advance... LIke 40 degrees plus by 2200 rpm. Basically - megasquirt isn't paying attention to my spark table. any idea how to fix it? Quote Link to comment Share on other sites More sharing options...
Okimoto Posted June 9, 2006 Share Posted June 9, 2006 I had that same problem with the isuzu, turns out it was a fuel issue where the pump was pretending to provide the full pressure when the truck was idle, but moving caused the same problems. Replaced the FPR and I got 35 at idle, but 10 after the car warmed up. Finally replaced the fuel pump after leaving a pressure gauge connected at the tank for several runs. Quote Link to comment Share on other sites More sharing options...
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