ShoBoat Posted April 5, 2015 Report Share Posted April 5, 2015 So i have put my girl back in her summer mode once again, a little early this year. Installed my H&R's, summer wheels, tune, intake and 3 bar. Mine has the V8 LMS tune. I started seeing some KR at lower RPM's at 60 to 70 mph at mid throttle. Then I started to replicate the issue while logging with Forscan and my laptop. AT mid throttle (without downshifting) (once boost got above 4 PSI) I was seeing KR of 4.5? I decided to try some WOT runs, no KR to speak of but I am getting a hesitation (shudder) at the top end to 2nd and 3rd. I checked all the usual suspects, oil in the CAC nope. Plugs, changed them and gapped to 30. Air cleaner check. Fuel was the last on my list as we still have winter gas in the pumps, changed stations and filled up with 94. No change. Called LMS and they said its probably the fuel. SO in goes some 110 Octane fuel. That should fix it? Nope.... So I then tried to load the 91 V8 tune. Same issues. Frustrated I went to the stock tune and the issues go away. I changed the map sensor only and returned it to stock. All other mods stayed on the car. I even swapped out the map sensor to rule that out. No luck. It was running strong at the end of last year with no problems with the tune and all the mods. I did put the winter package on a little early so it was still above freezing when I did. Any thoughts? Has anyone experienced similar issues? RudyFloum and EkbergJen 2 Quote Link to comment Share on other sites More sharing options...
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