March 2024 – New Radio?

I have often wondered if the Panasonic “Cockpit” radio would fit in the SM. Here’s a short article about these radios. The German SM-wiki also mentions them as a viable SM radio. They are fairly rare and somewhat intriguing – In my opinion, they definitely fit the space-age vibe of the SM! I recently, found […]

September 2023 – Another Electrical Upgrade

After renewing the wiring for the injection system and seeing great benefits from doing so, I started thinking maybe it was time to renew the ignition wires – they were on the car since at least 1979! The wires on the car looked ok, but were a bit stiff/rigid: I went ahead and ordered a […]

July 24, 2023 – Injection Electronique – Lessons Learned

Summary – renew the injection harness! If you have an injected SM with the original 50-year old injection wiring harness – replace it with a new harness! The two-piece harness can be acquired from a number of the usual SM parts suppliers. If you want to know why I say this harness should be replaced, […]

July 2023 – EYE CANDY

Now that the SM has been back on the road for a few years, I thought it would be nice to post a few of the many nice pictures I and others have taken of her…enjoy!

December 5, 2021 – New Windshield Washer Pump & a Milestone

Last week I noticed the windshield washer nozzles were not working consistently – I figured the nozzles were plugged. On closer inspection, turned out that the washer pump was intermittently failing (locking up). Before swapping it out for a generic washer pump, I elected to see how hard it would be to find an original […]

November 17, 2021 – Window Relays

A few months ago I added a relay to the starter circuit to take the electrical load of the ignition switch when cranking the engine over. I did this primarily to preserve the ignition switch, but also to ensure a solid voltage level getting to the starter relay. The other common use of aftermarket relays […]

October 12, 2021 – Throttle switch warning!!!!

A couple of days ago, I described the Throttle Switch (TS) used on the fuel injected SMs. The TS is also known as a Throttle Position Sensor or TPS to some people. The original Bosch part number for the TS that came on the cars from the factory was 0280120011 (according to the Citroen factory […]

October 10, 2021 – Throttle Switch Demystified

All cars that use D-Jetronic Fuel Injection use a “Throttle Position Switch” or “Throttle Switch” (TS) made by Bosch. There are different models of the switch for different cars, but they are all effectively the same internally. Back when D-Jetronic was still current (1960s-1970s), if a TS failed, it would simply be removed and replaced […]

October 6, 2021 – Hidden Bluetooth AMP 3.0

Back in 2019, I created a prototype hidden Bluetooth stereo using an old ashtray. I refer to that as version 1.0. It wasn’t pretty, but it was intended as an experiment. In 2020, I implemented a cleaner solution that I call version 2.0. I have built a few of these for other SM owners. A […]

September 13, 2021 – Fire Suppression Equipment

More than a few Citroen SMs have succumbed to fire. On carburetted SMs, fires can start from leaking or overflowing carburetors. On injected SMs, the original Bosch injectors were defective and leaked fuel! Moreover, with the injected cars, there are a number of rubber fuel hoses in the engine bay which are known to rupture […]