Running rich

[mackgoo]

Any ideas?

98, 2.5l 95,000 miles. It runs great.

Edited October 29, 2004 by mackgoo

[Loren]

So, would that be a P1124? or are you getting other codes too?

[mackgoo]

Unfortunately I don't know this is what the shop says. I think it's only the one code. They can't find anything wrong. They feel it may be a slight vacuum leak that causes it to richen at hwy speed and then brings in the code at idle. I'll know more today when I pick it up. The plan for now is to reset the code and then see what happens.

So, would that be a P1124? or are you getting other codes too?

<{POST_SNAPBACK}>

[mackgoo]

What we are getting is P1123 and that's it. Any ideas?

[Loren]

According to the ODB II Manual the potential causes for a P1123 are:

- Fuel pressure too high.

- Fuel injector leaking.

- EVAP canister purge valve open.

Other possible causes (per past experiences) are:

Water in the air cleaner housing.

Crack in the oil filler hose.

[xavi.ordonez]

According to the ODB II Manual the potential causes for a P1123 are:

- Fuel pressure too high.

- Fuel injector leaking.

- EVAP canister purge valve open.

Other possible causes (per past experiences) are:

Water in the air cleaner housing.

Crack in the oil filler hose.

HOW WOULD A CRACK IN THE OIL FILLER HOSE CAUSE A P1123 "RUNNING RICH" CONDITION? CUZ I THINK THAT'S WHAT I HAVE!!!

[Loren]

Additional air leaking in causing the DME to add more fuel.

[Bruce2010]

HOW WOULD A CRACK IN THE OIL FILLER HOSE CAUSE A P1123 "RUNNING RICH" CONDITION? CUZ I THINK THAT'S WHAT I HAVE!!!

One of the common causes of 'running rich' is

a faulty oxygen sensor. I had quick look online,

and found fault code P1123 gave 'Oxygen Sensor'

Don't rush to change it though, before first making

sure it is faulty, and not just some dirty connections.

However, some vehicle manufacturer's do recommend

changing O2 sensors at regular intervals, as the fault

generally doesn't show up on the engine management

light in the early stages of failing.

[xavi.ordonez]

The crack in the oil filler hose was causing the CEL to show a rich condition, found the whole patch it up with air conditioning insulation tape similar to this http://shop.corvettecentral.com/1963-96-Corvette-Air/C2-1963-1967/HeatingAir-Conditioning/-p7265745.html and then aluminum tape on top of that for heat protection ( make sure to overlap). The insulation tape worked great since it is stiky and flexible you can really work it between the ridges on the elbow of the oil filler house. It's not an expensive part but I had all the materials left over from an other project.

The important thing is that YES an small whole in the oil filler hose can cause a CEL. Don't go replacing oxygen sensors like crazy just yet!!!