Unknown Opening in Top of Engine

jalbin · Mar 16, 2017

Update

So I threw an Edelbrock breather cap on the opening that was a very tight fit. My truck just shot a P0138 code: O2 Sensor High Voltage Bank 1 Sensor 2

Wise · Mar 16, 2017

Sounds like air/fuel ratio is lean. If it were me id start with checking that your oil cap, pcv and hoses are tight and the fittings havent slipped out and reset to see if comes back on.

jalbin · Mar 16, 2017

Everything seems good, but the PCV valve grommet feels a little loose. I guess this is my main concern:

Why is that opening there if I already have a breather installed properly on the driver side that goes to air cleaner, and a PCV valve on the passenger side?

Wise · Mar 16, 2017

Who wouldnt want an extra hole... but seriously it's because they are aftermarket valve covers

jalbin · Mar 16, 2017

Awesome. The answer I was looking for. So, do I leave that breather cap on or do I like... put a second oil cap on?

Wise · Mar 16, 2017

I would stick with what you have. You could put a cap on but from your picture it would need to be a push in style as it wasn't cut out for a standard oil cap. Some come with a cut out for a cap in each cover and two rear push outs or just a rear punch out and no front hole at all, being aftermarket there are different variations depending on needs.

jalbin · Mar 17, 2017

Well I greatly appreciate all your advice. I am much more at ease than I was earlier.

Wise · Mar 17, 2017

Not a problem aftermarket parts can make things confusing especially when your not the one that put them on. The person who added them probably did it for the looks your factory covers wouldn't of had the hole at all.

jalbin · Mar 17, 2017

I almost thought it was "manufactured" into the factory cover until I saw the aftermarket ones with the holes.

Unknown Opening in Top of Engine

jalbin

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