P1131 lack of ho2s-11 switches-sensor indicates lean (b1,s1)

[Midnight]

I have this code coming up on my SCT scanner.

the marauder will begin to hesitate at idle, it does not do it all the time.

if I rev the engine up to 2K, the symptoms will go away and then re-appear after 2-5 miles.

Most people indicate a vacuum leak. I checked EVERYWHERE. Unplugged things... Put my thumb over the vacuum hole... No impact.

I doubt it's a vacuum related issue, because then the engine would idle higher right?

My issue is.... When the p1131 goblin appears.. My engine cannot idle. It drops way low, and try's to stall.

I know I probably need to have a diagnostic thing done... Which can check all the activity on the sensors (to make sure one isn't responding slow, causing the issue)

But... Until tomorrow morning... I'd like to hear opinions!

Let the ideas ROLL!http://img.tapatalk.com/d/13/10/09/a3edy5u3.jpg

[JBFTech]

If you are only lean on one bank, it may not be a vacuum leak. Check for an exhaust leak on that manifold/header, and if you have access to a scanner that can read live data, watch all sensors and see what that sensor is doing. The sensor may be dead, or just slow due to build-up.
If you have no misfires, and it doesn't run rough, you can almost rule out an injector issue, but not completely. Also, a vacuum leak won't always make an engine idle high, most times it will run rough, but in most cases is also audible, and typically a vacuum leak sets codes for both banks lean not just one.

Sent from B.F.E. by aliens

[Midnight]

Which side is b1, S1?

[RF Overlord]

In OBD-II, bank 1 is always the bank with the #1 cylinder and sensor 1 is the upstream sensor.

[Midnight]

Passenger? Driver?

[babbage]

I would suggest:

Take the IAC (Idle air control) off clean, and reinstall.
Change both front O2 sensors, after 100K they are not to be trusted.

[03mmmonroe]

Passenger? Driver?

Passenger side.

[Midnight]

My only issue is this problem started the minute I left my mechanic.... I got a new transmission, new oil pan gasket and new oil pickup screen (was clogged with carbon and whatnot... I don't know how that happened since I change my oil super regularly)

I'm going to have them hook a computer up to it... See what time it is. Lol

[Mike M]

If you are only lean on one bank, it may not be a vacuum leak. Check for an exhaust leak on that manifold/header, and if you have access to a scanner that can read live data, watch all sensors and see what that sensor is doing. The sensor may be dead, or just slow due to build-up.
If you have no misfires, and it doesn't run rough, you can almost rule out an injector issue, but not completely. Also, a vacuum leak won't always make an engine idle high, most times it will run rough, but in most cases is also audible, and typically a vacuum leak sets codes for both banks lean not just one.

Sent from B.F.E. by aliens

Usually a vacuum leak will be on just one side of an engine. For example, the intake manifold gasket fails. It won't normally fail on both sides of the intake, it will fail on one side.

Things that would give a code for lean on both banks would be something like a weak fuel pump-clogged fuel filter-MAF out of range.

If you have a lean code on one side I would start at that bank and get a can of carb cleaner and spray around looking for a leak.

Also I have had customer cars that had a failing fuel pumps where the pressure went very low but the code was only on one side. As it got worse it starting showing codes for both sides.

[Midnight]

What is the vacuum noise that happens when I switch it from drive to neutral.... Doesn't it do it from reverse to neutral too? Because now it's not...

Can I find my leak there?

[Midnight]

Also..... The intake manifold is one big peice that services both intakes evenly... How would only "one side" fail...

Unless im mistaken in some way... The big aluminum peice on top is the intake....

Hmmm

[Mike M]

Also..... The intake manifold is one big peice that services both intakes evenly... How would only "one side" fail...

Unless im mistaken in some way... The big aluminum peice on top is the intake....

Hmmm

The intake doesn't fail, one of the 2 intake "gaskets" could fail and often does. One gasket on each side of the intake manifold sealing each of the 2 heads. That's how.

[Midnight]

Issue has been resolved. Sensors were simply worn out... Replaced all 4 to remove any doubt in the others.

Hopefully, I'll get my fuel economy restored back to normal (was averaging 16 mpg... Had a hard time breaking 300 to a tank)

[Mike M]

Wow 300, I'm impressed. I have never come close to that.