Missfires...No Start..

[Avant1.8BT]

Every 2 days or so my car will not start. i will be driving the car fine all day running around town and such then i will park it for about 3-5 hours then it will crank over and almost start. the plugs are sparking, wet and i have compresion but the car wont start. if i let it sit for a few more hours around 7-9 then it will start up after a lot of cranks. the 2nd time this happened my check engine light came on flashing but they went away after about 2 miles of driving. i went to autozone and got a qucik scan and had missfires from every cylinder. i also notice the misfires happening when i really get on the car around 5800rpms or so. Im going to borrow my friends vag-com to get the actual codes, hopefully that will help out.
TIA.

[creechsa4]

do you have a boost gauge, what's your vacuum like at idle?

[Avant1.8BT]

do you have a boost gauge, what's your vacuum like at idle?

vacuum is 16

[Avant1.8BT]

im new to vag-com but here is what i got after scanning....
VAG-COM Version: Release 311.2-N


Chassis Type: 8D - Audi A4 B5
Scan: 01,02,03,08,15,17,25,35,45,55,56

Address 01 -------------------------------------------------------
Controller: 8D0 907 557 P
Component: 1.8L R4/5VT MOTR HS D04
Coding: 06201
Shop #: WSC 06325
8 Faults Found:
17968 - Maximum Engine Speed Exceeded (Engine Warranty VOID! :-)
P1560 - 35-10 - - - Intermittent
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - - Intermittent
16685 - Cylinder 1 Misfire Detected
P0301 - 35-10 - - - Intermittent
16688 - Cylinder 4 Misfire Detected
P0304 - 35-10 - - - Intermittent
16500 - Engine Coolant Temp. Sensor (G62): Implausible Signal
P0116 - 35-10 - - - Intermittent
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - - Intermittent
16686 - Cylinder 2 Misfire Detected
P0302 - 35-10 - - - Intermittent
16686 - Cylinder 2 Misfire Detected
P0302 - 35-10 - - - Intermittent
Readiness: 0000 0001

Address 03 -------------------------------------------------------
Controller: 8E0 614 111 A
Component: ABS/EDS 5.3 QUATTRO D00
Coding: 0273004284
Shop #: BB 24334
No fault code found.

Address 08 -------------------------------------------------------
Controller: 8L0 820 043 D
Component: A4 KLIMAVOLLAUTOMAT_D75
Coding: 04142
Shop #: WSC 06325
Note: Excessive Comm Errors

Skipping Address 15-Airbags

Address 17 -------------------------------------------------------
Controller: 8D0 919 910 P
Component: B5-KOMBIINSTR. VDO D05
Coding: 02242
Shop #: WSC 00000
No fault code found.

Address 35 -------------------------------------------------------
Controller: 8L0 862 257 N
Component: CV-Pump D10
Coding: 16204
Shop #: WSC 06325
6 Faults Found:
01371 - Alarm triggered by Door Contact Switch: Driver's Side
35-00 - -
01374 - Alarm triggered by Terminal 15
35-00 - -
01370 - Alarm triggered by Interior Monitoring
35-00 - -
01369 - Alarm triggered by Hood Switch
35-00 - -
00991 - Interior Lights
28-00 - Short to B+
00955 - Key 1
09-00 - Adaptation Limit Surpassed

Address 45 -------------------------------------------------------
Controller: 4B0 951 173
Component: Innenraumueberw. D03
Coding: 00102
Shop #: WSC 06325
No fault code found.

End -------------------------------------------------------

[creechsa4]

thats decent vacuum. thought you might have bent some valves for the inconsistent starting. run a compression test to see your motor condition. you said your plugs were wet...

[creechsa4]

oh yeah slipped my mind, maybe your icm is on its way out.

[Mawhitey]

Coolant temp sender over fueling on cold start would be my guess, change that and the plugs and you are golden

[Poopie]

my bet is the coolant temp sensor too. when my was on the fritz my car would not start.

[nji14]

Thanks for the fast responses, my coolant temp gauge stopped working recently so it makes sense it would be bad. any idea on my problems at higher rpms? its seems to missfire ...any thing i can log with a vag-com to help?


posted on friends name..still Avant1.8Q

[Poopie]

what plugs are you running? try bosche f6 dtc. they cleared up my misfires.

[Avant1.8BT]

what plugs are you running? try bosche f6 dtc. they cleared up my misfires.

NGK BKR7EIX, i had a set of oh Bosch Super R1's in before or something..

[Poopie]

i had the 7eix's before they misfired a lot. worst $30 I ever spent on plugs.

[Avant1.8BT]

i had the 7eix's before they misfired a lot. worst $30 I ever spent on plugs.

yeah did you have the missfires in high rpms? then when you switched to the bosche f6 dtc they cleared out?

[Poopie]

yeah any boost beyond 19 psi and high rpm it would studder and miss quite a bit. They just seemed to blow out. Then i switched to the boshe plugs and they were awesome on the street. They missed ever so slightly at 7500 on the dyno, but you would never feel it on the street. I think it had something to do with the way the dyno loads the drivetrain.

[Avant1.8BT]

yeah any boost beyond 19 psi and high rpm it would studder and miss quite a bit. They just seemed to blow out. Then i switched to the boshe plugs and they were awesome on the street. They missed ever so slightly at 7500 on the dyno, but you would never feel it on the street. I think it had something to do with the way the dyno loads the drivetrain.

yeah when i hit 22-25lbs it would start to missfire. hopefully i can find the plugs locally, reall wanna take my car to the track soon.

thanks for the help poopie.