[W126 Coupe] starting problems

[Dick Spellman]

Clay, For now ignore the instrument vacuum gauge. You are describing a hard
start on a hot engine.  Where you have to depress the pedal to open the
throttle plate suggests you have a fuel leak and the engine is simply
flooded.

So, look for the fuel leak.  You need a set of gauges hooked up to the fuel
distributor, a heavy jumper wire for fuel pump relay terminals and 30
minutes to test the resting state after fuel pressure on the system is
established on the gauges.  Go get a cup of coffee and when you return look
at the resting pressure...if you see the pressure has drop (as I suspect you
will) you will need to check each of the following.

injectors for leaks, cold start injector for leak, *control piston seal for
leak*, accumulator weakness.

The one test you can do right away without gauges is the control piston
seal.

That's it.  No short cuts, just jhave to go through the tests and then you
will know what needs fixing.

Gauges are $80 from Star Products in NY...I've written about them several
times on this list.

Good luck,
Dick

On Mon, Dec 22, 2008 at 12:28 PM, clay <benzman3 at cox.net> wrote:


>  Hi Guys, when car is idling the economy gauge is on full left and when I

> put it in gear with brake on it's an 1/8 to 1/4 above the bottom.

> Adjustments off, too rich or too lean. If I start first time in am in garage

> it starts instantly,and if you try it again,and again the same. But if you

> leave it for 5 minutes you have to almost floor it to get in started. And I

> still haven't found the drain.

> Clayon Moizo

> 1988 SEC

>

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