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My car "was" a 1990 190e 2.6, automatic. Now it is a 190e 3.0, manual. I have installed all of the 2.6 running gear except for the throttle body, which is 3.0. It has taken quite some time, but I have just picked up a 1990 300TE engine computer. Right now I am using the 2.6 computer just to drive the car around the neighborhood because I am worried about the engine getting too lean at high RPM. Should the 3.0 computer be a direct drop in solution? Is there something I am overlooking? I was told by my MB dealer to be sure that it is a 1990 3.0 computer because of frequent changes in those years. Looking around on the web, it looks as though the O2 sensor might be different. Any help would be great.
 

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which 3.0 is it? if it's the 3.0 DOHC you'll need that computer as the cams need to be activated by the computer.

instead of installing that, a shop attached some sensors to a tach so when I hit 3500 rpm (well I can adjust it to whatever) the second set of cams turn on.

not sure if that's the answer you're looking for!
 

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The engine I have installed into the 190 is a 12valve out of a 1990 300TE. The intake and the exhaust have been cleaned-up and Jet-Hot coated. It has new injectors, idle control valve, fuel meter, rubber parts, ect...."Is there anyone out there with a degree in Jetronic?" Someone has to know this stuff backwards and forward. Where are you MB-V8 guys with all the answers?
 

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Check the mixture, via the hydrocarbon level, is as per the book probably about 0.4 and if so there is no reason that the car should have any issues. the computer does only about 2% of the engines tuning, the rest is manual.
 

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mbNZ said:
http://Check the mixture, via the hydrocarbon level, is as per the book probably about 0.4 and if so there is no reason that the car should have any issues. the computer does only about 2% of the engines tuning, the rest is manual.
hydrocaron level? HC? Forgive me for being blunt, but that is complete mumbo jumbo.
The KE III Jetronic system on your car is - as you already have discovered - virtually identical to the one used in the W124 with the 3,0 liter engine.
In fact, exactly the same fuel distributor is used in both, and also in the mighty 3,2 liter AMG version of the 190...
The set up of the system is however important to get the most out of your engine. Normally you check the pulse ratio (exp?) from the diagnosis system connector in the engine bay. Warm engine, and lambda 1 should result in a value around 50% (+-5%). If not so, adjust the mixture screw (small allen key accessed trough the air cleaner) until 50% is reached.
Then rev the engine (still in neutral) to 2000 rpm, and check that you still get about 50%. If the reading here is more than 10% off, have a specialist check your system for leakage, throttle setting, setting of air flow meter etc.
And though the system is basically mechanical, the box is capable of approx. +- 25% mixture adjustment in "closed loop mode", so the correct box is of course the way to go...

best regards,
Swedish Benz
 
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