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#1
06-11-2010, 12:05 AM
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420SEL hard warm start solution
I have a 91, 420 SEL with 197Kish on it. It always starts quick when it is bellow 40 degrees F, but after it has run for a bit, is shut off for a while, it "can" be cranky to fire up. Some times it will catch right away, and some times it takes a couple of tries and some foot work before it fires up.
The car was neglected when I got it. It needed a fuel distributor, accumulator, Injectors, etc. I have found that this warm/hot start issue is very common with these cars. I have been collecting the parts to make a "Black Box" solution and today finally got around to building a proof of concept. Actually, yesterday I tried a quick and dirty version that didn't leave me all warm and fuzzy in side, so today I built what I had in mind and I am very fuzzy. I still need to put some more validation time on the system and clean up the construction design before I will claim victory, but so far I it is doing exactly what I had in mind. The "Black Box" goes between the cold start injector and the Computer. It has male and female injector connectors so there is no wire cutting. Only one wire needs to be inserted into the Starter Relay wire connector next to the brake booster, and that is it. No tools required to install!! The Black Box pulses the cold start injector for an (adjustable) amount of time while cranking and allows the computer to pulse the injector normally. After I am comfortable there are not any gremlins in the system, I could be persuaded to make some more if anyone had the same starting issues. I am not familiar with the various (Gas) models but I imagine that this system could be installed on just about any model with a cold start injector. 
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