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2001 E430
30 Posts
Discussion Starter · #1 ·
Hello guys,

try this one. I changed the CAT last week and recently changed the MAF. all is 1000% better idles great at or around 500 rpms at idle etc etc... I recently noticed a slight rev of engine at start up. it goes to about 1000 then real quickly goes to 1500 the drops fast to 500 and stays there. it drives fine???
I think before i changed the CAT and MAF it reved a liitle at start but not like this with the slight quick jump. Do you think this is bad??? I did not change the O2 sensors nor the fuel filters witch i plan to do..... I quess it could be the O2 sensors????? ANY ADVICE..

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