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MARKSTI · 03-19-2015, 11:11 PM

As title says

Two days at the track..first time I pushed the car a little in a TT class revving to redline and the check lamp comes on..starts flashing..car was dropping one or more cylinders on track.
Code po300 and po306 come up for misfire when scanned in the pits.
Reset it....went out for a 5/10ths lap and the felt like crap...but no lamp or code.

Reset the ECM...unhooked the battery ..and parked the car for the day.

Driving home mil came on....it ain't a bad injector or coil..engine internal..ran some testing to confirm this...don't care to get into it further as there are a lot of arm chair mechanics on the web.

Moral of the story don't flash your ecm and void your motor warranty with the ls7

Great car I think..just weak motor.

03-19-2015, 11:11 PM	#1
MARKSTI Drives: 2015 z28 sold Join Date: Dec 2014 Location: As Posts: 80	2015 Z28 two days at track..hurt motor? As title says Two days at the track..first time I pushed the car a little in a TT class revving to redline and the check lamp comes on..starts flashing..car was dropping one or more cylinders on track. Code po300 and po306 come up for misfire when scanned in the pits. Reset it....went out for a 5/10ths lap and the felt like crap...but no lamp or code. Reset the ECM...unhooked the battery ..and parked the car for the day. Driving home mil came on....it ain't a bad injector or coil..engine internal..ran some testing to confirm this...don't care to get into it further as there are a lot of arm chair mechanics on the web. Moral of the story don't flash your ecm and void your motor warranty with the ls7 Great car I think..just weak motor. Last edited by MARKSTI; 03-21-2015 at 07:41 AM.