weird sound and rev
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Member
Joined: Aug 2005
Posts: 100
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weird sound and rev
i just put a second engine in my car because the block on the original cracked due to morons at the local firestone, but anyway the new/used engine has 100,000 miles and runs great but today whenever i am at a stop the engine makes a weird ssshhhh noise then the revs shoot up a tiny bit. this doesnt seem too serious now but need to know if anybody else has encountered this problem and i need to know whats going on and if it will get worse. just curious what you guys think, although ill probably take it to my mechanic. thanks for any input!! 
Senior Member
Joined: Jan 2003
Posts: 429
Likes: 0
From: London, UK
W124
i have a '94 e320 sedan
The spark is controlled by the ECU and messing with different resistance plugs can blow it up. Stick with Bosch super F8DC4.
The idle is also ECU controlled on your car. It sounds like you have a vacuum leak on the inlet side which is altering the mixture and confusing the ECU. Make sure all the clips are tight and all the pipes are connected and not split. See if you can hear where the ssshhhh noise is coming from.
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