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  #1  
Old 04-22-2012, 11:11 AM
1997 E320
 
Join Date: Dec 2011
Location: NY
Posts: 82
Throttle body question

I have a rough idle. Did a boost leak test and all is fine.
When I took out the throttle body from the car is the throttle plate supposed to be tightly shut with the body? Mine has a 1/8 gap. Is this normal or do I have to adjust it to shut with a snug? Is there adjustments for this or a new throttle is needed $$$$$?
Another thing, I placed a pcv valve on the breather hose from the throttle tHe engIne. If this pcv malfunctions (cheaply made) and seize the vacuum, wI'll this cause a rough idle also?
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  #2  
Old 04-22-2012, 12:38 PM
oldsinner111's Avatar
love all animals
 
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,651
I know that these cars don't fully close the throttle plate, nor do they open fully
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  #3  
Old 04-22-2012, 01:24 PM
1997 E320
 
Join Date: Dec 2011
Location: NY
Posts: 82
OK thanks. Maybe my egr is bad? If I take it out I would want to get rid if it totally. I know I have to block the input to the engine and cap the vacuum line. What about the hose that goes into the secondary air pump?
Fyi. I changed plugss ,coils, fpr and I just bought gas filter.
this i s the problem I'm really having.
I installed the supercharger, placed pcv valves on all the vacuum lines coming from intake except for the fpr and transmission line(cannot locate) I went up to 370cc injectors. I have no vacuum leak as proved with the boost leak test. I tuned te car where a/f is around 14.7.

When in park and neutral the idle goes up and down as te a/f. When I'm in gear the fluctuation is not as bad but it still is not stable.
What about the purge valve? Fuel pump?map sensor?WA the check valves needed at the purge vale and map sensor?
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  #4  
Old 04-22-2012, 02:27 PM
yzn yzn is offline
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Join Date: Jan 2012
Location: Amman, Jordan
Posts: 111
Quote:
Originally Posted by topdeez View Post
When in park and neutral the idle goes up and down as te a/f. When I'm in gear the fluctuation is not as bad but it still is not stable.
are you using recirculating bypass valve to before supercharge?

one m111 the throttle is fully closed when the engine is shut off ,there is a screw inside the throttle body to adjust the opening
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  #5  
Old 04-22-2012, 02:49 PM
1997 E320
 
Join Date: Dec 2011
Location: NY
Posts: 82
Holy ****!!
I just tried to start my car after sitting for a day and there was like a loud explosion that came from the intake side. Smoke came up from the engine bay and dissipated. Cannot pin point. Then I tried to start again and it did after a long start.
It was doing this once in a while since I put the injectors in but not so loud as just now. Can leaking injectors cause this? Too much fuel leaking into the engine from the remaining pressure overnight?

Or maybe too much damn fuel at start up with my tune
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  #6  
Old 04-22-2012, 07:31 PM
1997 E320
 
Join Date: Dec 2011
Location: NY
Posts: 82
Quote:
Originally Posted by yzn View Post
are you using recirculating bypass valve to before supercharge?

one m111 the throttle is fully closed when the engine is shut off ,there is a screw inside the throttle body to adjust the opening
Yes I jam using a bypass valve plumbed back into the intake between maf and charger.
The car is a 97 e320. M104 engine
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  #7  
Old 04-23-2012, 02:30 AM
yzn yzn is offline
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Join Date: Jan 2012
Location: Amman, Jordan
Posts: 111
Quote:
Originally Posted by topdeez View Post
Yes I jam using a bypass valve plumbed back into the intake between maf and charger.
The car is a 97 e320. M104 engine
i was have the same problem the car keep goes up and down at idle
my solution was to make the pipe between the MAF sensor and (where the air is return to SC from valve) a bit longer

this is the old MAF location


and the new location with longer pipe
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  #8  
Old 04-23-2012, 10:24 AM
1997 E320
 
Join Date: Dec 2011
Location: NY
Posts: 82
Worth a shot,
What I'' do is remove the vacuum from the bypass valve so its closed all the time at idle and see if there is any difference.

Thanks,
Rock
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  #9  
Old 04-24-2012, 02:20 PM
yzn yzn is offline
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Join Date: Jan 2012
Location: Amman, Jordan
Posts: 111
Quote:
Originally Posted by topdeez View Post
Worth a shot,
What I'' do is remove the vacuum from the bypass valve so its closed all the time at idle and see if there is any difference.

Thanks,
Rock
i have actually tried that , but it let the engine idle at high rpm,
but i think this will work since you are using vortec sc ,
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