TR one side runs

Aaron,

wow...I'm scratching my head ....to dig much further you will need the Late TR Service Manuel and run some tests of the FD's, specifically the Upper/Lower Chamber pressures and continuity of the regulators..thelate TR's had the most complicated and by far the worst system Bosch ever developed. Half the time it's an electrical connection problem between the Lambda Computers & the System and Half the Time it's really a component failure. When I run up on difficult problems like this I generally lean towards electrical issue somewhere in the system

JRV,

Thanks for the input, I pulled a bunch of data off the web –

I think I have a pretty good understanding of what it is all about, and agree that it is probably electrical –there really are not that many parts.

My initial belief is that the ECU is thinking the wrong thing for some reason – could
Be throttle switch –is dumping all fuel back to the tank so there is no pressure to drive the injectors.

Most difficult part about all this is the repertoire of fittings needed to test the various pressures in the system.

I’ll let you know when I’m in over my head and panicked,

Aaron

With respect, I think that a very careful study of the shop manual and explanation of the fuel and electrical systems is in order, from your posts you could get very sidetracked and cause much more expense in money and time than required. In all of my factory training classes, the first rule is to study and understand how the system operates and the necessary input criteria.
The people who post advise in THIS board have many years of experience, if you give us the answers we need, we can probably guide you along. The obvious thing jumping out in this post is that the electrical side should first be checked, it sounds as though the fuel supply is at fault. There are two virtually seperate systems on your car.

Reghards, Brian

JR,
Spent a while on the phone with Larry, Have one question (so far)- On a '90TR where is the fuel pump relay?

Thanks,

Aaron

Fuses and relays for each of the fuel pumps are located in the front compartment main fuse board. Check also the large white connectors along the bottom, look for browning, indicates possible loss of electric contact through excess heat.

Brian

Aaron,
I don't think that the problem is with the electronic part of the system. The lambda computer just drives the mixture lean or rich, by varying the current to a valve on the fuel distributor. Even if the lambda is dead the engine should still run on that bank, albeit very lean. From your description, I would say that you either have a fuel delivery problem (pump is bad), the fuel pressure regulator is bad, or the fuel distributor is bad.
You stated that it was easier to depress the air flow meter plate on the side that was not running, The resistance to plate movement is caused by system pressure acting on the end of the control piston in the fuel distributor. You should check the system pressure to see if there is a problem with the fuel pump , or the external fuel pressure regulator which is what controls the system pressure. If the system pressure is ok and you still have no resistance at the air flow meter plate, I would say that the fuel distributor is defective. One possible cause is fuel contamination. Did you check the fuel filters to see if there was any debris in them?

Good luck!
Brian Brown
Patrick Ottis Co.

Here is a good link that describes the function and diagnosis on the Bosch KE Jetronic http://www.autosite.com/garage/encyclop/ency07c.asp

I know as far as my 85' QV it does more than just regulate the mixture by gathering info from the 02 sensor. It sets the duty cycle(controls fuel pressure) for the frequency valve, reads tps, etc. So I don't consider a correct statement that the lambda control unit only controls the 02 sensor.

Thanks Rich!!!

Any diagnosis will first require the establishing of fuel pressure at both fuel distributors, checking for voltage at the pumps would be my numero uno port of call,then if there is voltage, is there fuel? If no fuel, suspect the supply line etc., etc., etc..

Until the basics are confirmed......

Regards, Brian