QuestionQUESTION: My '74 FI 914, runs rough, rich and fouls out the plugs. Is there way to get engine codes off this model? How can I tell if it is the O2 or MAP? What kind of rough adjustments to the dwell/timing can I do to get the thing to stay running?
Thanks for any help.
ANSWER: Is this 1.8 or 2.0 lit?
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QUESTION: 1.8 litre.
AnswerI’m assuming you have a Bosch L-Jetrontic system, which would use a AFM (air flow meter) as opposed to the Bosch D-Jetronic system, which uses a MAP type sensor.
Is there way to get engine codes off this model? I don’t recall that failure codes are stored anywhere. If you mean a serial number its probably located in the reward section of engine compartment on the engine case.
As far as running rich, there could be a few things going on: vacuum lines, timing, dwell, AFM, etc. Not knowing how long you have owned or serviced the car, I would take an “all four corners” or check list approach, especially considering the age, inspecting:
Valve adjustment,
Plugs,
Wires,
Cap, Rotor and Points, Dwell and Timing
Check every vacuum line,
Fuel filter, fuel pump pressures, injectors
On, and On.....
Besides using a Porsche 914 Shop Manual for reference, there are a few books which are very helpful:
Bosch Fuel Injection and Engine Management by Charles O. Probst
Haynes Automotive Manual Series for the 914 (not as good as the Porsche Manual but it helps).
I’ve owned a 1.7 and 1.8, both ran very well for me. Lot’s of fun to drive, easy and low cost maintenance. The only modifications I made were ditching the points for pointless ignition system and a better exhaust.
Here is a good site to start you off:
http://manuals.type4.org/ljet/components/ljet10.htm
