Loud Clunk, Rich Mixture on Startup
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Junior Member
Joined: Jul 2009
Posts: 18
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From: Los Angeles, CA
2007 E-350 Sport
Loud Clunk, Rich Mixture on Startup ***SEE VIDEO***
Three Questions::
1) What would cause a loud clunk under the hood during each start? This is when the engine kicks over. The "clunk" drops the rpm and then quickly returns to normal. Smells very rich during start but then runs great when it warms up. No CEL or codes. Dealer says they could not replicate while in the shop.
2) Where is the "Knock Sensor" located? (Maybe the problem?)
2) Notice some oil in and around the Crankcase Vent Valve and also within the tube/hose from this part to the throttle body (under the MAF). Is this normal?
1) What would cause a loud clunk under the hood during each start? This is when the engine kicks over. The "clunk" drops the rpm and then quickly returns to normal. Smells very rich during start but then runs great when it warms up. No CEL or codes. Dealer says they could not replicate while in the shop.
2) Where is the "Knock Sensor" located? (Maybe the problem?)
2) Notice some oil in and around the Crankcase Vent Valve and also within the tube/hose from this part to the throttle body (under the MAF). Is this normal?
Last edited by Spiegea; May 15, 2013 at 12:14 AM.
