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Old 09-11-2018, 03:50 PM
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P0171 P0174 LEAN C63
Replaced the Gasket, Bolts, PCV Valve. Still throwing up codes. Everytime i clear it the whole car starts shaking bugging out sometimes even dies unless i give it a rev. My question is what can it be for such a rough idle, it idles at 1k unless the air conditioner is on. Getting very poor mpg even in Comfort mode. This is my last straw with this car sadly. If i cant fix it im going to say my farewells with this car.
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Old 09-11-2018, 03:54 PM
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Maybe try O2 sensors. Make sure all the vacuum connections are installed properly since you disconnected them to take the intake mani off.
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Old 09-11-2018, 04:19 PM
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2005 E55
Did you inspect the throttle bodies? The plate is know to crack and let air through it.

they sell metal plates on Ebay for 250 if it's broken or I have an OEM one for 300 if you want it. I also have 2 OEM throttle bodies if they are the problem
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Old 09-11-2018, 05:19 PM
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How can i check if its the throttle body???
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Old 09-11-2018, 05:21 PM
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Originally Posted by skratch77
Did you inspect the throttle bodies? The plate is know to crack and let air through it.

they sell metal plates on Ebay for 250 if it's broken or I have an OEM one for 300 if you want it. I also have 2 OEM throttle bodies if they are the problem
how do i check if its the throttle body
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Old 09-11-2018, 06:04 PM
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2005 E55
Unfortunately you need to take the whole thing apart again.

the oil eats up the tb plate and cracks it
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Old 09-11-2018, 06:42 PM
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Originally Posted by skratch77
Unfortunately you need to take the whole thing apart again.

the oil eats up the tb plate and cracks it
there is absolutely no shot spark plugs can throw these codes is there
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Old 09-11-2018, 06:44 PM
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2005 E55
Originally Posted by Alex Abashidze


there is absolutely no shot spark plugs can throw these codes is there
I would change plugs and 02 sensors first
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Old 09-11-2018, 07:12 PM
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Originally Posted by skratch77
I would change plugs and 02 sensors first
will do, o2 sensors are working fine i was thinking spark plugs fouled out
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Old 10-24-2018, 01:47 PM
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Originally Posted by skratch77
I would change plugs and 02 sensors first
mercedes said it ended up being the o2 sensors would that be causing the loss of power aswell???
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Old 10-25-2018, 10:07 AM
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Originally Posted by Alex Abashidze


mercedes said it ended up being the o2 sensors would that be causing the loss of power aswell???
Yes, big time!! Since the ECU uses it to control the mixture.
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Old 10-26-2018, 02:19 PM
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Originally Posted by Solo wing
Yes, big time!! Since the ECU uses it to control the mixture.
i just dont get why at idle itd rev up to 1000 and then when i put my ac on itd idle normal
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Old 10-26-2018, 03:42 PM
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2005 E55
Originally Posted by Alex Abashidze


i just dont get why at idle itd rev up to 1000 and then when i put my ac on itd idle normal
If you need oem amg throttle bodies and the oem plate that can crack and leak I have a set. I upgraded to 82mm throttle bodies with new bigger plate.



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