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  #1  
Old 06-18-2010, 02:19 PM
latief's Avatar
1993 300E 2.8- M104
 
Join Date: Aug 2009
Location: Gainesville, FL
Posts: 518
Gas in intake?

So today, i took out my throttle actuator to rewire it....easy....

as i removed the resonance flap (box above the intake) i could see some liquid in there (probably some oil), but there is a really strong smell of gas??? yikes.....

where is the gas coming from....???

car has a mixture problem (obviously), throwing codes 9, 13 on pin 8 ....

I can think of two locations for gas to come in:

1-Fuel pressure modulator: but i did pull the vacum hose multiple times, and never smelt gas or seen any liquids.

2-My Purge valve seems to be stuck wide open, with no pulsation.

Please advise, as i am worried this could be a bigger problem somewhere..i hope not

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Old 06-18-2010, 08:17 PM
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1993 300E 2.8- M104
 
Join Date: Aug 2009
Location: Gainesville, FL
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bump for help with this.....
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Old 06-18-2010, 09:33 PM
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You mean something like this?




This is from a M103 inlet manifold. However this is very common. Over time some leakage occurs. I just generally clean this out - occasionally - when I'm bothered.
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Old 06-18-2010, 11:30 PM
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1993 300E 2.8- M104
 
Join Date: Aug 2009
Location: Gainesville, FL
Posts: 518
I think that is oil for the most part. I have some of that too, but today i has some strong gas smell from inside the manifold. Not sure if it gas vapor, or actual gas......but i am thinking gas
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Old 06-19-2010, 03:14 PM
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Loose Cannon - No Balls
 
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Most common source is the fuel pressure regulator, forward end of the fuel rail. A hole in the diaphragm will allow fuel to be pumped down the vacuum line and into the intake causing a rough idle after running a few minutes.
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Old 06-19-2010, 11:57 PM
latief's Avatar
1993 300E 2.8- M104
 
Join Date: Aug 2009
Location: Gainesville, FL
Posts: 518
Quote:
Originally Posted by babymog View Post
Most common source is the fuel pressure regulator, forward end of the fuel rail. A hole in the diaphragm will allow fuel to be pumped down the vacuum line and into the intake causing a rough idle after running a few minutes.
I've did the (unplug vacuum line at regulator test) multiple times while the engine is running. no liquids or smell. is that test sufficient or should i go ahead and change it?
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Old 06-21-2010, 04:21 PM
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That test should be sufficient. A better test is to mityvac the line from the FPR. If it holds, it's good.

I would vote for a drippy injector. Common, oh so common.
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1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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Old 06-21-2010, 04:24 PM
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oooh, missed that M104 part. I don't know if what I said applies to M104 as it does to M103. Sorry.

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1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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