Misfires turned down because of cam and all, but NO misfires showing current on any cylinder, and check engine light is flashing away??
Misfires turned down because of cam and all, but NO misfires showing current on any cylinder, and check engine light is flashing away??
Factory Stock 97 SS M6 13.51 @ 104.3 mph
Stock Longblock LS1 w/ 233/238 P.S.I. Cam
10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago
'99 TA trunk mounted 76mm 6 Liter
9.0s in '09 @ 153 MPH
Turbo 5.3 Volvo 740 Wagon
32psi and still winding out 5th on the highway somewhere
So if you start car, it shows little bit of misfires current in log, and its stuck in open loop, check engine light flashing. If you clear clodes, misfires stop counting, check engine light stops flashing and it goes into closed loop like normal. Later might start flashing again but doesnt show curent misfires counting up
Factory Stock 97 SS M6 13.51 @ 104.3 mph
Stock Longblock LS1 w/ 233/238 P.S.I. Cam
10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago
'99 TA trunk mounted 76mm 6 Liter
9.0s in '09 @ 153 MPH
Turbo 5.3 Volvo 740 Wagon
32psi and still winding out 5th on the highway somewhere
It might just be the polling rate of how your scanner is setup. I've run into this problem before and finally just turned off misfire monitors all together. On the ones I leave misfire monitors in place I raise the rpm setting to look for misfires up above 3300 that way it'll still show a dead miss, but none of the phantom stuff.
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
The polling rate is fast enough to see the misfire counters in any other vehicle
Factory Stock 97 SS M6 13.51 @ 104.3 mph
Stock Longblock LS1 w/ 233/238 P.S.I. Cam
10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago
'99 TA trunk mounted 76mm 6 Liter
9.0s in '09 @ 153 MPH
Turbo 5.3 Volvo 740 Wagon
32psi and still winding out 5th on the highway somewhere
this can happen when the ECM determines the crank acceleration and deceleration pattern has changed from the learned pattern.
a crank relearn can usually fix it if this is what is happening.
Neal
yep dealt with this in mostly 6l engines but a relearn fixes it most of the time. good call man, save alot of ppl a bunch of headachesOriginally Posted by legerwn
Bu it usually stores a code when this is the case does it not? There are NO codes in the system, none
Factory Stock 97 SS M6 13.51 @ 104.3 mph
Stock Longblock LS1 w/ 233/238 P.S.I. Cam
10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago
'99 TA trunk mounted 76mm 6 Liter
9.0s in '09 @ 153 MPH
Turbo 5.3 Volvo 740 Wagon
32psi and still winding out 5th on the highway somewhere
If the SES light is still flashing, you most likely still have a misfire. Put all your misfire tables back to stock, multiply by 1.5 just to numb them down a hair, put the P0300 DTC reporting back to stock, then log misfires on each *individual* cylinder. I bet you'll find your problem.
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