VOLVO PENTA V8 300 C-A MISS POWER & BACKFIRE

Bob999333

Cadet
Joined
Mar 27, 2018
Messages
14
Hi everybody,This model is equip whit catalyst system 1 sensor before catalyst and another after catalyst for each bank so 4 O2 sensor total.I replaced already the cap-rotor and wiring , good fuel pump and filter.I bought the Rinda Techmate pro and I have some code but the code don't match whit Volvo Penta code ????. I have detected 3 code : SPN=639 SPN=4238 SPN=3256 when I look in internet they all related to O2 sensor, I removed the 4 sensor and 2 look bad,is it possible this condition cause backfire and I cant go over 2000 RPM and no torque.I try to find the good shop manuel without sucess.Thank you in advance for your help.
 

muc

"Retired" Association of Marine Technicians...
Joined
Jul 7, 2004
Messages
2,064
I might be able to help, but an engine serial number makes it so much easier for me.
 

Bob999333

Cadet
Joined
Mar 27, 2018
Messages
14
THANKS Muc, here the serial number I had ; engine parts: 40869423
serial; A223003
VPGAS035632 10/2012
2 TWC,H025,ECM,MFI
I really appreciate your help,have a great evening, Robert
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,093
639 12DTC 1627 CAN-J1939 Rx fault


4238 1DTC 1158Closed-loop gasoline bank2 low


3256 5 DTC 140 EGO3 open / lazy
 

Bob999333

Cadet
Joined
Mar 27, 2018
Messages
14
Hey guys I found my problem, 2 spark plug was faulty on the same bank !!!! I replaced 1 month ago but I think I dont use the good one,
 

muc

"Retired" Association of Marine Technicians...
Joined
Jul 7, 2004
Messages
2,064
Glad you found the problem.
If the Techmate will clear the misfire counter, I recommend that you do that after replacing the spark plugs.
 
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