'93 325i Euro O2 Sensor doubt

[jc43089]

Check the FPR hose as Shogun suggested. I would bet your issue is to do with a vacuum leak or fuel problem.

[TRF434]

Thank you for the tips. I will keep you posted after I troubleshoot the components you guys pointed out.

All the best!

[TRF434]

A simple test you can do, pull the vacuum hose from the fuel pressure regulator, if fuel drops come out from the hose, the fuel pressure regulator diaphragm is broken and the FPR cannot regulate the fuel pressure/volume anymore.

Check the FPR hose as Shogun suggested. I would bet your issue is to do with a vacuum leak or fuel problem.

Hello guys,

I haven't checked the FPR yet because I was building an ADS interface to scan error codes. Here they are:

         E R R O R   M E M O R Y           ---------------------------------------


Datum:     12.11.18 19:14
ECU:       DME331
JobStatus: OKAY
Variante:  DME331
-------------------------------------------------------------


RESULT:    :  4error in error memory ! !
-------------------------------------------------------------


69    Knock sensor Channel 2


Error counter   : 59


   Engine speed                              3400.00  1/min
   Coolant temperature                         36.00  Grad C
   Hexcode=45A855703B                           0.00  [HEX]


   Open circuit
   Invalid working area (Plausibility fault)
   Fault stored after de-bouncing delay
   Error not present
   Sporadic error
-------------------------------------------------------------


36    Tank ventilation valve


Error counter   : 51


   Engine speed                              1480.00  1/min
   Coolant temperature                         68.25  Grad C
   Hexcode=24F2259B33                           0.00  [HEX]


   Short circuit to ground
   Open circuit
   Exhaust gas relevant fault
   Fault stored after de-bouncing delay
   Error present
   Sporadic error
-------------------------------------------------------------


19    Secondary air pump


Error counter   : 50


   Engine speed                              4360.00  1/min
   Coolant temperature                         87.75  Grad C
   Hexcode=13A16DB532                           0.00  [HEX]


   Short circuit to batt+
   Open circuit
   Fault stored after de-bouncing delay
   Error not present
   Sporadic error
-------------------------------------------------------------


7     VANOS magnetvalve


Error counter   : 53


   Engine speed                              4200.00  1/min
   Coolant temperature                         24.75  Grad C
   Hexcode=07B1696135                           0.00  [HEX]


   Short circuit to batt+
   Open circuit
   Exhaust gas relevant fault
   Fault stored after de-bouncing delay
   Error not present
   Sporadic error


=============================================================

• I find strange that VANOS valve is wrong since it is brand new. Maybe because of a faulty knock sensor #2 VANOS isn't working properly?
• Regarding the tank ventilation valve, I'm looking for information on the Bentley manual.
• I have no idea on what to do with the Secondary air pump error since I think my engine isn't fitted with one.

Any thoughts?

Thanks!

[TRF434]

Finally after several years trying to figure why my engine ran like crap, I finally discovered that the culprit was a toasted engine harness. From the maintenance history of my car I saw a number of overheating situations and a few replaced radiators. I figured that maybe some wires of the engine harness suffered from the high temperature incidents and it came to be true. I was trying to test continuity between the MAF connector and the DME connector and I had two broken signals. Upon further investigation, a few wires disintegrated as I slightly pulled them.

The car successfully passed all emissions tests without tricks. Below the results:


gas_emissions.png

I think the idle values are a bit rough. Also I can feel that the engine vibrates a little at idle and I can hear a whistle coming from ICV. I did vacum leak tests and found none. Is a whistle a sign of a bad ICV and engine vibration at idle? I replaced spark plugs and checked coils and coil boots and found no issues there.

Thanks!

[SMS20221]

Hello how are you? Finally, after making the harness change, did you install the oxygen sensor that is supposed to come in that slot, or did you leave it working without it?