I am beginning to suspect that my car has leaky fuel injector/s. At start ups, whether hot or cold, it starts rough and seems like fuel is flooding for several seconds then it clears up. Engine idles rough and misses.

It might be related or not but this car will not start at first attempt to start. Maybe second or sometimes third.

Any ideas how to isolate leaky injector?

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joel

Prayers bring forth enlightenment.

Joel:

What condition is your ignition system in?

Distributor cap, rotor, spark plug wire suppressor caps; spark plugs.

Without knowing any history, I'd first wonder about the ign. system since this problems occurs both hot & cold.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"

Just had them all replaced. My indy also suspected the injector/s since this car failed emission testing on idle with high HC reading.

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joel

Prayers bring forth enlightenment.

Joel:

I may stand corrected, but I believe high HC is indicative of a rich condition. If so, there could be issues other than tired fuel injectors.

Did your tech test the functionailty of the EHA? I believe it handles the leaning/enrichment process as per feedback from other parts of the system.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"

HC = unburnt fuel. High HC does not necessarily = too rich. A lean misfire can also cause high HC. Until you determine the cause of your rough idle, it's just guessing.

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1989 300 SEL that mostly works, but needs TLC

You can inspect your sparkplugs to identify a rich cylinder.

If your mileage is pretty high, probably best to replace all injectors. It's not too difficult on M103, and injectors are only $36 ea. You need new seals and probably plastic mounts, too.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

This is actually what my indy told me, unburnt fuel, which is what he suspects to be leaky injectors. In fact, the CE light comes on and off when I step on the gas generously.

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joel

Prayers bring forth enlightenment.

Mike, what are the values of a working EHA? I've read something about twitching it, too?

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joel

Prayers bring forth enlightenment.