VZ SS V8 Crewman - Missfire 3 xFuel use

[aussiemowat]

G'day guys,
I've an VZ SS V8 Crewman which was running perfectly until Monday when hit a (large) puddle and now running rough.
Also using 3 times the amount of fuel with no power. Previously running avg 13-15l/100.....now 36l/100 and as rough as guts.

Runs perfect on start-up & cold.

Mechanic spent day on it as no fault codes showing.

Any ideas?

Thanks

 

[SavVYute]

The sudden quenching of your oxygen sensors could have ruined them?

 

[XUV]

Is your air-filter water logged/clogged/damaged/still wet , take it out and see how it runs .

 

[franklinfrog]

Sounds like O2 sensors, check their wiring, or test operation or just replace. I'd just be putting new ones in.

On cold start a car is in open loop mode and ignores O2 sensors, using predetermined fuel/air ratios, once it's warmed up it switches to closed loop and uses O2 sensors to determine ratios. Seems to suit your dilemma.....

 

[aussiemowat]

Thanks Guys.
Yep spot on. just disconnected the 2 sensors and running fine. reconnected one at a time to find faulty one. 15 mins. Sorted

Why the mechanic couldn't do this is beyond me. Time for a new Mechanic I think. Plus he wants to charge me 5 hours labour at $90/hr.

 

[aussiemowat]

Apology to the mechanic.....I think.

Drove for 2 days with only 1 sensor connected and runs fine.

Bought new one & installed. Fault back. Doesn't matter which I disconnect (new or old/ left or right) but wont run properly with both.

Any ideas?

Is there an issue with running only 1? (Obviously I'd prefer to get the problem sorted)

 

[A9L]

Blow the O2 sockets/plugs out with compressed air and reconnect.