Quote:
Originally Posted by damico
I also have a similar problem... I have a bouncing speedometer on my 1988 300e, I wonder if both these problems are linked
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The speedometer is driven mechanically by a cable that runs to a gear in the transmission. Most of the time bouncing is caused by the cable lacking lubrication inside it's sheath, causing it to bind slightly at low speeds. Alternatly, it can also be caused by the tip of either end of the cable not being completely seated into its slot and slipping a little.
BOUNCING GAS GAUGE
The gas gauge bouncing is another issue entirely. Bouncing is often caused by a loose electrical lead from either the back of the gauge pod or the sending unit on the tank. Before going to the trouble of removing the sending unit try removing the plug from both ends and re-seating it.
**NOTE: Be sure to check inside the plug and recepticle for corrosion. If you find any, clean it out. Apply a small amount of di-electric grease to the connector and plug it back in.
If you do end up removing the sending unit to clean and inspect it it's always good to do some research and find out if there are any seals or filter that you may wish to replace. Starter fluid works great for cleaning out a gummed up sending unit, but be sure to wear gloves as it WILL give you chemical burns after prolonged contact.