300E STARTING TROUBLES AND LOW EHA CURRENT

[tdhc13]

Hello Everyone: I am very grateful for the ability to join this forum. I have a 1991 300e, have 118k, that has allot of difficulty starting cold or hot.

This problem started when I jumped terminal 85 to 30 on the block that the relay behind the ovp relay sits (now believe this relay is connected to the cruise control) I thought that this might be the fuel relay but later confirmed that the fuel relay is build into the MAS unit. The fuse on the ovp blew and I have had starting problems ever since beyond my initial issue (popping in the intake manifold, which I have experienced before and was resolved with new injectors). This time new injectors did not correct the problem. So, I opted to change the fuel distributor since they are notorious for problems when left the car is sitting for extended periods with little to no use. My fuel pressures are within limits. I have replaced the fuel injectors, the fuel distributor. A few months ago, I changed the fuel filters and both fuel pumps. To try to resolve the low idle issue, I replaced the temp sensor and the OVP relay, installed a used but "tested good" CIS-e unit and MAS unit with no change, installed a new fuel sensor (potentiometer) and it is set to the required .70 volts at idle. My car will start if I step on the gas but it will die out. If I allow it to crank for about 20-30 seconds, it will finally idle but very low idle. It runs like this for about 2 minutes and then seems to go to limp mode. My eha current with koeo, is about 12 ma ( think it is supposed to be 20 ma), it rise to about 30 ma while cranking and then falls to about 1-2 ma at low idle at normal (hot) engine temp. When the car goes into what I think is limp mode, the idle increases to about 750-900 rpm. My duty cycle fluctuates between 49 to 42 %. The eha current is at 0-2 mA. Periodically, the idle will rise to about 950 rpms and my duty cycle changes to about 30-39%. Snapping the throttle brings it back down. I have checked the continuity and resistance to all of the following circuits and sensors: the eha, the icv (gets 11 volts on pin 2 and about 750 ma until limp mode then voltage drops to 4 volts- should there be voltage on pin1?) the temp sensor voltage is 5 volts and resistance of the new sensor is within factory limits, the micro switch has normal resistance and is working to open the circuit when off idle. The throttle valve switch is working as designed. There is no increase in eha current upon raising the idle I think that is because cis-e unit is in limp mode). All continuity checks to and from the cis-e to the temp sensor, the icv, the eha, the cold start valve wiring pass ohm tests. Not sure what is causing it to go into limp mode. I do not own a pulse reader. The x11 on off ratio fluctuates and periodically holds 49.9 percent for 1-3 seconds and then fluctuates. I thought that perhaps the fuel sensor was the problem. I replaced it and it checks out fine. While in limp mode should I still be able to see lambda results? Any help will be appreciated. In case, I didn't say it, I got a used cis-e unit and MAS unit incase I may have shorted one or both of them with my initial attempts to jump relay to put fuel pumps on with key off to check fuel pressures. I hope that someone is able to understand my thread and help me figure this out. Beginning to wonder if the "test good" used cis-e unit is bad. I get the same problems if I reinstall original equipment.