Lean Burn

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Foot - 21 Apr 2008 04:58 GMT

I've got a vehicle that is running less than one tenth of a volt on O2
sensor...I can trick vehicle to run rich at 0.9 volt.

This is a 1984 Bosch LH II system, which currently is only using the
Air Mass Meter (Mass Air Flow) to determine fuel amount.

At this time, I have concluded the ECU (ECM) is messed up.

Question - It drives OK....no higher RPM misses...just smooth driving.
At idle, its a pinch rough.....should I fix it?

Water temp is OK....

Reply to this Message

Mike - 21 Apr 2008 05:23 GMT

> I've got a vehicle that is running less than one tenth of a volt on O2
> sensor...I can trick vehicle to run rich at 0.9 volt.
[quoted text clipped - 8 lines]
>
> Water temp is OK....

What vehicle ? What engine ? How are you tricking it to run rich ? Any
codes stored ?

Reply to this Message

Foot - 22 Apr 2008 07:04 GMT

>> This is a 1984 Bosch LH II system, which currently is only using the
>> Air Mass Meter (Mass Air Flow) to determine fuel amount.
[quoted text clipped - 8 lines]
> What vehicle ? What engine ? How are you tricking it to run rich ? Any
>codes stored ?

1984 Volvo (2.3 Liter)...no codes possible on Bosch LH II system.

I pull plug on Air Mass Meter...it will run rich.

Oh well, I'll just buy a rebuilt ECU (ECM) for it

Reply to this Message

Don Stauffer in Minnesota - 21 Apr 2008 14:38 GMT

> I've got a vehicle that is running less than one tenth of a volt on O2
> sensor...I can trick vehicle to run rich at 0.9 volt.
[quoted text clipped - 8 lines]
>
> Water temp is OK....

Maybe in modern engines it is safer, but running too lean in the past
was a good way to burn piston crowns and valves.

Reply to this Message