[W126 Coupe] Help - Dead spot in accelerator

[Dick Spellman]

Hi Jack:

Assuming the rotor, cap and wires are all in fine shape, I'd suspect a 
fuel related issue.  Does not sound like the coil either.  I had almost 
exactly the same experience on an 86 300SE.  Turned out that the fuel 
pressures were off and I, with some number of PIA adjustments to the 
EHA, got the differential pressure back in spec and restored 
performance.  Could also be a bad fuel pump, bad accumulator or bad fuel 
regulator.  In short, all fuel tests need to be run to isolate the 
problem then effect the repair.  No easy way to fix until you diagnose 
on the fuel side of the beast.  You need a set of gauges (about $70 US, 
I can look up the source if you need it) or a mechanic that can do the 
tests.

Dick

XKEOTS at aol.com wrote:

> Hi All,

>

> On my 89 560 SEC when driving and pushing down on the gas pedal I have 

> recently noticed a dead spot in the middle of travel.

> The car accelerates well up to about 1/3 pedal down and then from 1/3 

> to a little more than 2/3's it does nothing, it is flat.

> If I am cruising and I slowly use the gas pedal it is fine in all spots.

> This just occurs when I have to get a move on.

> What should I look for?

> I just did oil, plugs, air filters.

> I also had to do rear brakes again as I was surprised that they only 

> lasted 13,000 miles.

> I didn't use Me/Be OEM this time.

>

> Thanks

> Jack

> 1989 560 SEC

>

>

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