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Thread: high RPM misfires, but no codes
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09-22-2006, 08:15 PM #1
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...
Last edited by Hurst Equipped; 12-13-2008 at 11:39 PM.
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09-22-2006, 08:27 PM #2
Yes, I am a Supporting Vendor
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Could be a timing issue.Remember Andrew was talking about the PCM learning the new cam position with the Starscan?
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09-22-2006, 09:01 PM #3
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???????
Originally Posted by 65standard
I wish I knew.I hate computers!
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09-22-2006, 09:35 PM #4
rain dance maggie
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until the PCM learns the CAM/CRANK difference (adaptive numerator), it will not detect misfires. the adaptive numerator is lost whenever the PCM is powered down (batt disconnect/fuse 11).
from FSM:
The Adaptive Numerator must be learned before the PCM will run the Mis-Fire Monitor. The PCM updates the Adaptive Numerator at every key-ON, and is relearned after battery disconnect. The Misfire Monitor will not run until the Adaptive Numerator has updated since the last battery disconnect. If the Adaptive Numerator is equal to the default value then the PCM knows that the Adaptive Numerator has not been learned and does not permit the Misfire Monitor to run. If the Adaptive Numerator exceeds a calibrated percentage, the PCM sets a DTC for CKP NOT LEARNED and illuminates the MIL.Izzy pics
money talks. unfortunately, mine usually says... "good bye!"
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09-22-2006, 11:46 PM #5
rain dance maggie
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the PCM will relearn adaptive numerator on it's own. it learns this during closed throttle decelleration when fuel is shut off so there is less chance of crank speed fluctuation.
if PCM is counting misfires, you can see which cylinder is misfiring.
ECU view > PCM > more options > monitors > OBD2 monitors > which cyl is misfiring.Izzy pics money talks. unfortunately, mine usually says... "good bye!"
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09-22-2006, 11:48 PM #6
In the lab with a pen and a pad..
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09-23-2006, 12:56 AM #7
Livin' the Mild Life in South Oakville.
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www.autoenginuity.com will do it as well. You can see the counts, see errors stored and clear them.
Hey Red, have you been using autotap? If so, how's it been working out?2006 Magnum SRT8 - 11.85@117
2007 SuperBee SRT8 - 12.21@117
2011 300 Limited - Who cares, it's good on gas and the chick digs it.
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09-23-2006, 02:47 AM #8
Zomg.
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did it misfire with your last valvesprings?
Maybe the new valvesprings really aren't any betterthan the old ones on this cam profile?!?2006 Charger R/T w/R&T - Black | Electronics Convenience Group | Sunroof | CMR | Police Steelies
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09-23-2006, 11:25 AM #9
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Had the same problem with my 61' Pontiac years ago, seems I had installed the timing chain wrong, I was 2 teeth off...................had just installed hot cam.....
Car ran great at low-mid speeds, at high rpm it would actually blow gas up and out of the carb.
Check cam timing?????????????????????????
BobLast edited by FloridaRT; 09-23-2006 at 11:26 AM. Reason: add info
Bob in Florida (71 yrs young), 05' Magnum RT. Flowmaster 40's, tint windows. Danko Shaker Hood, Chin Spoiler, Predator Grill with Honeycomb inserts, rear diffuser. Mud flaps & Tinted tails by Ernie 402. Version 3 rear spoiler by 402 Motoring. Honeycomb lower grills by NC-SXT. Silver Box shift kit by 351Freak. Hotchkis sway bars. SRT8 Wheels Nitto 255x45x20 tires..
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09-23-2006, 11:39 AM #10
LX Padiwan
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A screwed up Rev limiter?
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09-23-2006, 07:24 PM #11
Livin' the Mild Life in South Oakville.
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» Stats Originally Posted by maneval69
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So far, I'd say that's a good diagnosis. Oh, sorry, you meant on the car!2006 Magnum SRT8 - 11.85@117
2007 SuperBee SRT8 - 12.21@117
2011 300 Limited - Who cares, it's good on gas and the chick digs it.
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09-24-2006, 10:39 AM #12
LX Oldtimer
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How many miles on spark plugs???????????????
Maybe just need new spark plugs??????????
BobBob in Florida (71 yrs young), 05' Magnum RT. Flowmaster 40's, tint windows. Danko Shaker Hood, Chin Spoiler, Predator Grill with Honeycomb inserts, rear diffuser. Mud flaps & Tinted tails by Ernie 402. Version 3 rear spoiler by 402 Motoring. Honeycomb lower grills by NC-SXT. Silver Box shift kit by 351Freak. Hotchkis sway bars. SRT8 Wheels Nitto 255x45x20 tires..
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09-24-2006, 05:38 PM #13
LX Oldtimer
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Originally Posted by 65standard
Are those the stock plugs???????????
Or did you install some new ones??????????
Are they the right type???????????
BobBob in Florida (71 yrs young), 05' Magnum RT. Flowmaster 40's, tint windows. Danko Shaker Hood, Chin Spoiler, Predator Grill with Honeycomb inserts, rear diffuser. Mud flaps & Tinted tails by Ernie 402. Version 3 rear spoiler by 402 Motoring. Honeycomb lower grills by NC-SXT. Silver Box shift kit by 351Freak. Hotchkis sway bars. SRT8 Wheels Nitto 255x45x20 tires..
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09-25-2006, 08:50 AM #14
LX Oldtimer
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I would stick to the original type plugs...............cheaper also.
BobBob in Florida (71 yrs young), 05' Magnum RT. Flowmaster 40's, tint windows. Danko Shaker Hood, Chin Spoiler, Predator Grill with Honeycomb inserts, rear diffuser. Mud flaps & Tinted tails by Ernie 402. Version 3 rear spoiler by 402 Motoring. Honeycomb lower grills by NC-SXT. Silver Box shift kit by 351Freak. Hotchkis sway bars. SRT8 Wheels Nitto 255x45x20 tires..
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09-25-2006, 12:26 PM #15
LX Padiwan
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It's just the rev limiter from what I understand.
Spark is simply cut to several cylinders to prevent going far past redline. This method has been used for years on high-performance motorcycles.
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