Evening everyone,

I was working on the 420SEL today and decided I would take some pics of a few things for future reference.

I was having an intermittent stalling problem, where all of a sudden the engine would die. My mom was the daily driver of this car so naturally I was unable to reproduce the stall. Well, finally it happened to me. I think it was the fuel pump relay so I took it out and found a few cold solder joints.

Fuel Pump Relay:
420SEL Fuel Pump Relay - Imgur


Im also trying to tackle a high idle problem. I've replaced the main air lines going about the injectors, IACV lines and a hard line to the EZL. That did well, it fixed a stuttery acceleration but the high idle remains.

I found that by the bypass line that goes between the two IACV hoses had one end crimped closed, so I replaced it with a normal through pipe and that might have made things worse! So I figured I'd check the IACV and its controller.

The IACV is was receiving about 4.5-4.8 volts and it measured about 4.5 Ohms, so somewhere in the neighborhood of 1000mA or so. Thats within spec according to the FSM. So, I, evidently still have a leak somewhere. I wanted to check the controller to make sure it was OK so i pulled it and here we are:
420SEL Idle Speed Controller - Imgur

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(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


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