Engine light on - '91 940 B204E

Hi, my '91 940 with B204E has engine light on.
Jetronic says:

312 = Knock signal from ignition system absent
213 = Throttle position switch signal faulty at full load
113 = Fuel supply too weak/rich

If I reset the error, after some kilometers it will appear with same
response (without distinction between petrol or LPG).

I tried to replace knock sensor with another used and checked with
oscilloscope, but nothing changes.
I never push full down the throttle control (error 213???)

Checking ingition system it says "111"

The car run ok, only little difficults to start if warm engine was
previously turned off with LPG supply.
Perhaps it is only a little rich at idle.

How I can try to check?
Mass air flow meter?

Thanks.

 

LPG?

If it's a bi fuel that opens up a lot more possibilities. What kind
of LPG system? The ECM doesn't like propane and usually sets mixture
codes. The other two just need to be diagnosed and fixed. Clean and
adjust the TPS. It could be the wiring on both.

Steve Elms in Texas

 

stevee ha scritto:

I do not know how it is called in American, the Liquefied Petroleum Gas.
Here, in Italy, is GPL that, together to the methane (natural gas), they
constitute the only alternative for the Bi fuel.
However thanks.
Do you know that effects can have an excessive wear of pistons?
Poor idle? erred mixture?

Thanks and happy holidays

 

LPG is the correct term, another name is Propane.

 

Having done millions of Miles (klm here)on Liquid petrolium /petroleum gas I
can assure you it won't harm any thing in your engine.Just change your oil
when you should and keep your battery up to the job.As LPG needs more spark
make sure your leadsa are in good working order and use colder plugs .You
will get 75 to 80% of the mileage you get on petrol .As well you will lose
power and heat up more so clean your radiator and use a good anti freeze
anti boil with a well known brand name .Your springs may need up grading to
take the extra weight in the boot /trunk .As well up your rear tyre tire
pressures to compensate for the weight .Make sure your brakes are the best
you can afford as there is less motor pull up will gas .Advance your timing
..Watch the air intake is from infront of the car not behind the radiator as
gas needs cool air and some mechanics just pop an air filter on to and let
the hot air ruin the preformance further .Losts of lovely cold air and clean
air filters .Run the car on petrol /benzine every so often to keep the
system in order and never go straight gas, its duel fuel or nothing .

 

Telespalla Bob ha scritto:

Perhaps I resolved!
It seems to be fault of the ceramic module inside Jetronic...
Replaced with one desoldered from another similar ecu (same model LH
2.4, but different identification number), it seems that it is
working... we hope.
Thanks.