ZR8ED Posted October 8, 2004 Share Posted October 8, 2004 It never ends. My 280 may not be right after all. It is still running really well... but.. After a few days of driving the car (no issues).. the idle got higher. Approx 3-400 rpm higher than what it was the last week or so. It is now idleing @ 1400rpm. That is the first thing I noticed. Last day or two, I hear a bit more backfiring out the exhaust than usual. Gas mileage seems worse..stinkier too. Yesturday, I check under the hood, and adjust the idle back down to 1000rpm. I then notice that my BOV valve is partially open (vents to atmosphere) last time I had this, I had the timing checked, and noticed that timing was somehow retarded to 1 degree at idle (supposed to be 20) I checked my dizzy. nothing out of the ordinary ..doesn't look like its moved etc.. I have not opened it up to see if something has gone bad inside.. I'm not sure I'd know what to look for in a 300 dizzy..other than obvious signs of trauma. I'll get a timing light and check the car out, but... What could cause this? VG30et motor, stock electrical, reprogrammed ecu, larger inj, larger turbo etc.. Why would my timing shift? What else would cause higher vacuum? Thanks, Scott. Quote Link to comment Share on other sites More sharing options...
Z-Gad Posted October 8, 2004 Share Posted October 8, 2004 Higher vacuum and occasional backfiring are commonly caused by a vacuum leak. Check the hoses coming off the intake manifold for cracks, etc. Quote Link to comment Share on other sites More sharing options...
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