jimpennjr

I am planing on testing my fuel pressure. What is the spec for the 2009 2.2L?
I have searched and have gotten different numbers. I have seen 50-60psi and 57-67psi. Any help would be greatly appreciated. If anyone has access to All-Data that would be great info.
I am testing the pressure, because I have a p0172 (running rich) code.
I have cleaned the MAF, changed sparks, and I am currently running a fuel injector cleaner in the gas now.
Thanks in advance, Jim "jimpennjr"

jimpennjr

Would also like to know what is the OEM manufacturer of the o2 sensors. Rock Auto has multiple listings. Thanks again

donbrew

"running rich" could be flex pipe, or HO2 sensor. Before you throw any more parts at it get underneath and eyeball the flex pipe.

jimpennjr

Will check out the flex pipe. What O2 sensor? If it is the flex pipe, wouldn't I hear a little louder exhaust note? It hasn't been any louder?

donbrew

Maybe, maybe not louder. Could also be exhaust/header gaskets, that is one of the code descriptions that does not mean what it sounds like. Don't know anything about the HO2 sensors.

843de

Fuel pressure per the manual 50-60psi "key on - engine off".

pbatmen

I am running the same code, i just ordered the o2 sensors from rock auto, i have already replaced the injectors, maf, map, all ac delco parts, etc. quite annoying

donbrew

Rich fuel means that the HO2 sensors(plural) are getting readings that are indicating a rich mixture. It DOES NOT mean there is a problem with the HO2 sensors or injectors are bad or fuel pressure is high.

The HO2 sensors rarely go bad, and when they do, they have their own set of codes.
Fuel pressure is rarely too HIGH.
Injectors rarely go bad.

The HO2 sensors measure the difference of before the cat and after the cat. So, if there is an air leak in the flex pipe the before/after readings are "rich fuel mixture". i.e. the after is higher than the before.

Could even be a vac leak somewhere. Look in the places that do fail often first.

jimpennjr

What are some typical vacuum leak areas? If you can post a pic with arrows that would be greatly helpful. I'm a visual learner. I see and I can do. Reading I an do, but takes longer. Thanks for all the replies, Jim

donbrew

I am putting money on flex pipe, but anyplace there is a gasket or rubber/plastic hose. If you have removed and replaced HO2 sensors, you may not have sealed the correctly. Holes in exhaust system.

The last time my flex pipe failed I only noticed a noise when the right windows were open when I was driving past curbs with driveway cutouts. Sounded kind of like intermittent cicada noise.

Anyway, the point is : the description/name given for a OBDII code does not usually mean what a guy on the street thinks it means. There are books devoted to OBDII code troubleshooting. NEVER buy parts on the recommendation of an autoparts store code reader, before doing your homework.