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During diagnosis of P0175 (Bank 2 system too rich) and P2190 (System too rich at idle bank 2) the dealer says the intake manifold is "porous" and that it needs to be replaced.
I've seen the RTM engine intake manifold center mounting plate as offered by FCP Euro, but that's only part of the intake manifold assy.
If the intake manifold is porous, are they implying that its causing a vacuum leak leading to the rich codes at B2?
Usually vacuum leaks cause lean codes.
I would start by replacing the injectors ASAP ! (if they have not been replaced, since they stick open somewhat commonly on the M156).
I had P2190 for a year until I replaced the following:
1- PCV
2- fuel injectors
3- intake manifold gaskets
Thanks Solo. Will definitely try your suggestions.
Originally Posted by Solo wing
If the intake manifold is porous, are they implying that its causing a vacuum leak leading to the rich codes at B2?
Usually vacuum leaks cause lean codes.
I would start by replacing the injectors ASAP ! (if they have not been replaced, since they stick open somewhat commonly on the M156).
I had P2190 for a year until I replaced the following:
1- PCV
2- fuel injectors
3- intake manifold gaskets
I'm in the process of replacing fuel injectors, pcv valve and intake manifold gaskets per Solo Wing's suggestion.
After watching countless videos from Tasos Moschatos on youtube regarding the M156 magnesium/zinc/aluminum intake manifold, I decided to open it up and have a look-see.
I think I've found the source of my fault codes. It appears that the PO attempted a repair but it didn't hold up very well at all. I have ordered the replacement aluminum part from RMT. It should arrive on Monday January 3.
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