Jetronic - TPS repair

Jasper

Jasper

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Good day, all.

The throttle switch of my CSi only activates injectors 1,3 and 5. The TPS passes the usual out-of-car tests. But I noticed it shorts between pin 9 and 20 because the sliding contact or the PCB is worn down and connects the fingers of the two combs as well as the sliding contact. Result is it only activates pin 9 (odd injectors), but twenty times instead of ten. if I switch 9 and 20 in the connector, only even injectors are activated. I'm not sure a new PCB will fix the problem as the slider contact isn't that pointy looking.

What are my options? Does anybody do refurbs extending beyond PCB-exchange? Or do I change the PCB and cross my fingers?

/Jasper


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In under half an hour two people recommended Ton, so I've reached out to him. Thank you for the help.
 
Jasper said:
Nuh-uh. Just the wrong clips, I guess. As well as the valve cover. :)
Click to expand...
I believe Don is correct, the front 4 clips should go with the curvature of the airbox, the rear three go the opposite direction . So your front 4 would need to be rotated (if it matters to you).

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All done. And the TPS will soon be on it’s way back from the Ton.
By the way, how’s the thin hose from the radiator to the expansion tank supposed to be supported on a D-jet? Clip on the top front nut of banana no. 1?

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Ton did a great job. It’s in working order again. On to the stuck injectors. None of them worked, but a light tapping brought 1,3,5 and 6 back to life. They were all serviced eight or nine months ago and have seized. Ultrasonic cleaning or end of life?
 
Fj118? Or I have a fresh set of Bosch available?
what part number on yours?
dry injectors don’t like sitting.
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Last edited:
Jasper said:
Ton did a great job. It’s in working order again. On to the stuck injectors. None of them worked, but a light tapping brought 1,3,5 and 6 back to life. They were all serviced eight or nine months ago and have seized. Ultrasonic cleaning or end of life?
Click to expand...
Did Ton just rehab the PCB board or did he do work on the sliding contact also?
 
Reading your original post-

“The throttle switch of my CSi only activates injectors 1,3 and 5.”

The TPS has nothing to do with your injectors being able to operate.

Your car will run at idle just fine at idle with your TPS disconnected.

Most likely your fuel injection trigger points are worn out on one side?

Have you looked at them?

Take a good pic and post here?


11923
 
sfdon said:
Reading your original post-

“The throttle switch of my CSi only activates injectors 1,3 and 5.”

The TPS has nothing to do with your injectors being able to operate.

Your car will run at idle just fine at idle with your TPS disconnected.

Most likely your fuel injection trigger points are worn out on one side?

Have you looked at them?

Take a good pic and post here?


11923
Click to expand...
Before the TPS was refreshed by Ton, opening the throttle only activated 1, 3 and 5. The injectors didn't fire of course, but a noid light revealed that the activation was there. Pulses from the trigger points are bang on, alternating injections between 1, 3 and 5 and 2, 4 and 6 when turning the rotor by hand. Same thing with a 123 distributor.
Injectors are off to another cleaning. This time dry storage won't be more than 16 hours. They are 0280150015, by the way.
 
It’s alive! Running on all six and started on first crank. A bit noisy because it only has downpipes fitted. Now for the shift support fab, drive shaft alignment and exhaust refitting. Yay.

Hmmm, I would like to know about how that diode was installed.
Click to expand...
The diode is installed between the connector and the circuit board disallowing connection between pin 20 and 9.
 
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