Won't idle without dieng after using Carb + choke clenaer - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 08-26-2010, 03:59 PM Thread Starter
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Won't idle without dieng after using Carb + choke clenaer

I really screwed the pooch here.

Mercedes 1970 250 with dual zenith carbs.

I cleaned off my chokes with some carb cleaner because I was getting hesitation when it was cold. A couple of days later I decided to be clean off the carbs more and sprayed a some down the carbs as well. Everything was fine then and there and I let it be.

The next day I drive for about a mile and a half, everything's fine, then it starts to die on me. Start it up again, drive another mile, dies when I stop. I managed to be barely get it into a parking lot.

Currently: It will start if pump the pedal. I have to keep my foot slightly down or it will die. I can just barely get in into drive by keeping the pedal slightly depressed when shifting into gears. If i let off the gas completely it dies.

On the advice of a mechanic I replaced the spark plugs, no good. Another mechanic suggested I get it on the freeway and blow out whatever gunk pooled into the carbs and resoildified (if this is what really happened).

I'm going to try to get it on the freeway but I'm not hopeful. I figure my last resort short of getting new carbs / tracking down a possible vacuum leak is to get it started and just spray the crap out of it with MORE carb cleaner hopefully melting away the gunk that's lodged somewhere.

Which reminds me the last symptom is that I can sometimes get it to idle in park in which case the oil pressure gauge will bounce between 30 an 35 (45 max) like it has a vacuum leak. Previously it stayed maxed in park and idled at around 25-30 in a stable manner in drive.

I live in the rust belt and this car was basically an emergency measure for a second car this spring and I have been stressing about getting another car before the winter hits anyway. I don't really have the money to pump into fixing it and I feel that any money spent towards it would be better spent getting a car I can/would drive in the snow.

Future plans would to be get it running just to have as a summer car or to sell to someone who has the funds to actually take care of it.

Any advice would be great.
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post #2 of 3 (permalink) Old 08-27-2010, 07:59 PM
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Vehicle: 1970 250c, 300e amg
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Funny. Thats what I did to my perfect carbs. They were running perfect, no problem in the world until I put that garbage in them. In the end I had them rebuilt. Even thought they were rebuilt and adjusted and synced and all, I find she still doesnt run as good as before. Good luck
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post #3 of 3 (permalink) Old 08-27-2010, 09:17 PM
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Try adjusting the air mixture screws and if competent enough, re sync the carbs, good luck. It does sound like the carbs are not getting enough air.


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