i am still having this code i have replaced everything intake manifold gaskets egr valve dpfe sensor checked all hoses did a vacuum test had perfect vacuum i also replaced fuel filter and fuel pump. I did a fuel pressure test fuel pressure was at 35 with engine off with engine on i have 30 psi. About a year ago my Dad sprayed starting fluid in the throttle body when the fuel pump was bad and cracked the intake plenum so the plenum has been replaced. But basically it seams like ever since then i have been having this problem the only thing that hasn't been done that i can think of is to clean or replace the injectors. Also i had a misfire about a week or two ago on cylinder 3 and replaced the spark plug has been fine since.

 

If you can't find it, I'd fog it. Either take it to a shop that will do it for you, or make one. I am going to build one out of something like the machine in the link below. I've also seen people blow cigar smoke in there... but those are nasty.

 

ive tried it once with a fog machine but nothing.

 

I'd check the PCV system first, then head right for the MAF o-ring.

OP , no engine or mealage info.

Take it in, your lean on Both banks, should be and easy find. A shop will find it for yuh.

 

sorry its a 4.2 v6 61,000 miles trying to avoid a shop

 

I personally know someone that had both of those codes because he forgot to put the oil cap on when he changed the oil....

 

goes to show it could truly be anything 😒

 

LOL, you could say you had the largest PCV leak known to mankind.

 

Pretty much!