clunk on acceleration

LyricsNLines · Post by **LyricsNLines** » Wed Apr 15, 2009 8:40 pm

Vehicle
2000 Plymouth Neon
124,xxx
ATX

The Problem
Observed at low or high speeds. I can be coasting along and then once I give it a bit of gas to exceed 2k rpm, clunking sound heard from engine and also I've noted that the engine sort of bogs when being given gas exceeding 2k rpm on a sudden. This bog just came about as the clunk was heard from the engine.

Findings
I don't have a lift so I could only observe the top passenger side mount. When car is in "N" at idle and gas is given... nothing! Once car is put into "D" with E-brake engaged and brake pedal depressed, gas given and the engine rocks back and forth on engaging throttle, especially noted in top passenger side mount.

My guess is a motor mount malfunction but I figured I'd post here for extended feedback. My motor mounts were replaced about 20-30k ago, never touched the tranny mount.

teklein · Post by **teklein** » Wed Apr 15, 2009 10:13 pm

I would suspect the rear mount.

Go ahead and inspect it!

Post by **occasional demons** » Wed Apr 15, 2009 10:16 pm

Since they are not extremely old, I would try the inserts, and see how much they help. They are the cheapest way to eliminate the "drivetrain slop". ATX's can be just as hard on torque struts. My GF's old Chevy Celebrity went through the dog bones like mad.

A homemade urethane insert took care of that.

http://www.modernperformance.com/engine ... 6_378.html

LyricsNLines · Post by **LyricsNLines** » Wed Apr 15, 2009 10:26 pm

My neon is as stock as it can be right now. I did the motor mount inserts before on a more "Go" neon form before and didn't like the excessive interior vibrations.

Post by **occasional demons** » Wed Apr 15, 2009 10:35 pm

Then just buy new ones. Take the worn out ones and fill them with silicone. It wont be as stiff as the inserts. By the time the replacements wear out, the silicone will be fully cured.

The actual motor mount and ATX mount may be shot, prematurely wearing out the torque struts, also.

LyricsNLines · Post by **LyricsNLines** » Thu Apr 16, 2009 12:17 pm

Upon further inspection of the vehicle, the clunk actually turned out to be a pop which is a misfire. The actual problem turned out to be plug wires. Thanks for the info guys!