1998 986 2.5.
Greetings to all.
Out of nowhere while driving last week, bank 2, cyl 4,5,6 started misfiring badly. As in really bad. My first instinct was that I was out of gas, but had a half tank, and found the codes to be only for bank2.
Some additional background which may be important to know is that the cam solenoid for bank 1 had been failing earlier and also needed to be replaced. I successfully replaced the solenoid this weekend (a job that sounds much worse then it is and will post a documented step by step shortly with tool creation details...but that’s another story) Anyway, after completion, bank1 seems happy, but I still have misfires in bank2.
Here are the current error codes via durametric software.
Fault Number:P0300
Fault Number:P0304
Fault Number:P0305
Fault Number:P1319
Fault Number:P1316
Fault Number:P1317
I understand what they mean, but have yet to solve the problem. I would suggest the solenoid in this bank also, but I im not getting the cam error as I did for bank 1 (P1340) and this idle is much, much rougher.
Here is what has been checked based on other posts I have found here:
Coils- tested within range between .3 and .7 ohms
Plugs- look good
MAF- recently replaced, but I dont think it would effect only one bank anyway.
Checked for air leaks
Fuel cap-checked
Oil cap-removes easily during operation and causes even rougher running off
AOS-clean, no cracks, no oil in throttle
J-tube-replaced O-rings, no cracks
No burning oil, no milkshake oil, coolant good.
Yep...Im out of ideas....here is some realtime data from durametric. I not sure if it makes any sense to me. I dont know what to look for but maybe someone else does. Should I be looking at a different set of data? It seems to me, one of the many selections in the software would pinpoint a red flag. Anyone with an idea?? Long shots are greatly appreciated at this point.
Thanks. :cheers:
A-Time
B-Rpm
C-Air mass
D-Hot film MAF
E-Ignition timing
F-Exhaust temperature after cat. converter
G-Oxygen sensing cylinders 1-3
H-Oxygen sensing cylinders 4-6
I-O2 sensor voltage ahead of cat. conv.
J-O2 sensor voltage ahead of cat. c. bank 2
AAAAAAAAAAA__BBBB__CCCCC_DDDD_EEE____FF___G___H__IIIII___JJJJ
19:15:04.3593750__1440___49.5___1.96___20.3___52___1___1__-0.01___0.23
19:15:05.9062500__1560___51_____2.02___23.____52___1___1__-0.01___0.22
19:15:07.3906250__1400___42.5___1.9____23.3___52___1___1__-0.01___0.21
19:15:08.8906250__1200___39.5___1.82___18.8___52___1___1__-0.01___0.2
19:15:10.3437500__1560___59.75__2.08___19.5___52___1___1__-0.01___0.19
19:15:11.8593750__2120___62.25__2.08___27.8___52___1___1___0______0.18
19:15:13.3593750__2080___62.5___2.09___27.8___52___1___1___0______0.17
19:15:14.8281250__2120___59.75__2.17___27.8___52___1___1___0______0.17
19:15:16.3125000__2480___56.75__2______27.8___52___1___1___0______0.16
19:15:17.8281250__2600___76_____2.39___27_____52___1___1___0.01___0.15
19:15:19.3281250__2720___106.75_2.6____22.5___52___1___1___0______0.14
19:15:20.8281250__3840___58.5___1.9____21_____52___1___1___0______0.14
19:15:22.3281250__2000___50.75__2.04___29.3___52___1___1___-0.02__0.13
19:15:23.8125000__1640___52_____2______23.3___52___1___1___-0.01__0.13
19:15:25.2812500__1560___48.25__2.02___24.8___52___1___1___0______0.11
19:15:26.8125000__1520___47_____1.96___24.8___52___1___1___0______0.11
19:15:28.3125000__1360___43.5___1.92___20.3___52___1___1___0______0.11
19:15:29.8125000__1160___40_____1.86___18.8___52___1___1___0______0.1
19:15:31.2968750__1040___33_____1.68___16.5___52___1___1___0______0.09
19:15:32.7812500___800___29_____1.66___15.8___52___1___1___0______0.09
19:15:37.5156250_____0___29_____1.66___15.8___52___1___1___0______0.09