Yes the reading of 15% means you are at 85% and you need to be closer to 50%.In one of the post I did a readjustment of the EHA. this helped mine so that I could finely reach 50%

That's at idle, does Lambda come into play at idle as well? at anything other then idle I got varying volts. this is a 1988 2.3 l

Yes when all the system is at the correct electrical pulse the system runs in closed loop.The x11 p2&3 at idle warmed to operating temperature If all is well you will get 50%,pull the wires from the icv and the engine will turn to about 1700 this serves as close enough on the high rpm check and you should be in the same range of 50%, It will vary some.

Finally put my vacuum gauge on it and I was getting around 20 inches,,, seemed good to me, but I decided to check other vacuum users. It turns out that the gauge in the instrument cluster starts to leak around 20 inches, so I disconnected the eco gauge. Car seems to run better, but I did a few other things, like pull back on the throttle cable so the decel switch is closed at idle. This allows the system in closed loop at idle, but it may not be correct,,, I gotta check my TPS.

Drove the car a few miles yesterday and she ran out really nice, still need to get an emissions test to be legal.

I also replaced the Speedo cable with one from a 300e, that extra two inches make a big difference in reconnecting everything.

Will drive a little more today and emission test tomorrow (I might check teh TPS before emissions test,,, if I feel like it)

failed emissions test terribly,

Test reading / limit / units / result
HC 260.9 / 181 / PPM / FAIL
CO 0.34 / 1.16 / % / PASS
NO 2953.4 / 1313 / PPM / FAIL
CO2 14.03 / #### / % / ####

I've changed the plugs,,, but not the wires or cap

I have not changed the oil yet

I plan on buying a Sears DMM with duty cycle % to accurately set Lambda

It appears some fool messed with the idle adjust (factory calibrated butterfly - TPS sensor) and my TPS never showed idle - fixed it

Now to get the NOx down to an acceptable level,,,

You can hang some people with a new rope and still get complaints,All part of a tune up! adjust fuel,plugs, rotor,cap, wires,smoke test if running rough. Glade you have it running smooth but until you replace fuel distributor and EHA, you will never know what smooth and good gas mileage is. Good luck and I truly hope your daughter enjoys the car for a long time. THE other guy. JNT.

87 420sel tune up
 

JNT and the forum....i've been searching for a tune up proceedure for my daily 87. i'm just wrapping it up from new water pump & new radiator & thermo, new chain, guides & tensioner, vaccum pots for the ac/heater, valve stem seals new plastics for the OVH oil system of course all the hoses and belts, new voltage regulator etc:-etc:-etc:

once it's back running i'd like to give it a proper tune up but i'm not finding what i'm looking for.

what i'm looking for is a guide step 1 open the hood, step 2 beer, step start with......

any suggestions where some thing like this might be on this site or in what book. there are several post on eha, lamba x this or x that. but nothing in a feature by feature style.

any help out there???
tks
craig