Volvo@Ikea

Volvo@Ikea
This blog documents my Volvo 1800E project car; It may be of little interest to others but serves as an electronic logbook. I will also use it to document our travels in this car.

Sunday, July 2, 2017

The coolant temperature sensor strikes again!

Last night, I brushed up on my Bosch D-Jetronic knowledge while at work.  This morning, I removed the fuel pump relay bypass wire and when I turned the ignition switch to (on) the pump ran for a couple seconds then stopped (as described in my reference materials).  I then moved the throttle off of idle and heard the injectors clicking, as they should. I was thinking that the throttle position sensor might not be working properly and this is the test described in the service manual.  After that, I started the engine and noticed that the fuel pressure was now at 36 psi.  I adjusted it back to 29 and then started wiggling wires gently.  When I lifted up on the coolant temperature sensor wires, the engine immediately died!

I turned the key off and went to the other garage to grab my tools.  After removing about 3 inches of plastic tubing from the wires, it was very clear where the fault was.  The signal wire had a break in it, and it was close enough to the end that I didn't have to splice another wire to it.
After the repair I scrambled to find the car's registration sticker, checked the oil and drove with Kyle to have lunch at Portillos.

My Winter project will be to rewire the fuel rail.
Safely back home, under its own power.
The offending wire.

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