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#1
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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? |
#2
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I know that these cars don't fully close the throttle plate, nor do they open fully
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#3
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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? |
#4
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Quote:
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 |
#5
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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 |
#6
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The car is a 97 e320. M104 engine |
#7
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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 |
#8
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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 |
#9
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Quote:
but i think this will work since you are using vortec sc , |
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