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Old 06-20-2019, 11:24 PM
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Join Date: Sep 2005
Posts: 343
W114 wont idle and backfires

Hi all.

Have a w114 250.

Been sitting for a few years but cleaned out the tank and carbs.

Set the timing and dwell. Firing order is correct

Cranks but wont start unless I put my hands over both barrels on both carbs.

Once it does start she'll sputter and die and backfire through the carbs.

Any ideas would be greatly appreciated.
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Old 06-21-2019, 06:33 AM
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Join Date: Jan 2012
Posts: 7,179
Pull the carburetors apart and clean them, you have a lean condition.
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Old 06-21-2019, 09:31 AM
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Join Date: Sep 2001
Posts: 679
Agree, sounds like dirty carburetors causing a lean condition. If you aren't experienced with carburetors those are difficult carbs to start learning on. Don't try to run it a lot until the carbs are cleaned to prevent burning a valve.

Those engines are also sensitive to having good fresh spark plugs. A fresh set at the the time of carb cleanup is suggested.

Good luck!!!
Does a Caddy stretch? No, but a Mercedes bendz.
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