check engine at idle

[wang540]

I just changed my oil to 10w-40 castrol synthetic and now my check engine comes on about 10 seconds into idle. It goes away if I hit the gas above 1300 rpms. I had 5w-30 regular oil in there before but recommended was 10w-40 or 15w-40. Should I go back or is there something i'm missing?

[filip00]

i don't think the oil is problem.

i use Mobil S 10w-40 and no problem, works fine..

[wang540]

Kind of odd that it happened right after I changed the oil.

[Blitzkrieg Bob]

Kind of odd that it happened right after I changed the oil.

That you may have touched or bumped into while doing the change.

You may have knocked something loose.

[BillionPa]

fyi castrol syntec isnt synthetic oil. although it is good oil for 3-5000 mile intervals and no redline driving.

as bob says you could have touched a sensor harness. the MAF is in that area.

unplug the MAF, ICV, air intake temp sensor harnesses, clean the contacts with contact cleaner, then use a small amount of dielectric grease on the contact and plug em all back in.

you could have also nudged a fragile vacuum hose and induced a leak.

get the code from the stomp test and see whats up.

[Brandon J]

As BillionPa said, get the check (stomp) code. The light is there so that it can give you information. It could very well just be a coincidence or some kind of human error.

[Barry]

Wang,I have exactly the same problem.Changed oil and filter,used something different and boing!
Ive subsequently changed the oil back and a new oe filter,checked the check valve(thanks forum)and replaced the oil pressure sender unit on the cylinder head(m30)Twice!
I am still trying to find the problem after 4 odd months.Pulled the filler cap of while idling and saw Niagra Falls worth of oil flowing in the cam area.So now I drive the car knowing theres pressure at least.After driving and switching off, "oil pressure sensor"warning comes up..
Also had the oil light show dim for a while and then gradually get up to full brightness..This has however stopped and its only the warning now.
I will follow this very closely..

[wang540]

Well, I went back and checked everything twice and the check engine light still comes on at idle and goes away when I hit the gas. I'm not getting the "oil pressure warning" or the oil pressure light i am stumped. I also notice that my idle gets a little rough when the light comes on.

[BillionPa]

i bet if you turn it on, let it idle, then turn it off when the light comes on, and retrieve the stomp code, it will be Lambda Control (1222)