Air fuel ratio is going crazy

[robmustang201528]

Watch "Air fuel readings all over the place" on YouTube



Car is running like shit and Air fuel ratio is all over the place after I got gas. Yes I made sure it was 93 I was putting in the car not 87. Is it just a coincidence that it happened after I got gas or did something come apart or just stop working? I don't see any lose hoses or pipes. Car has been running fine without any issues until this morning after I got gas. What do you guys think? No check engine light on.

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[Jay-rod427]

That is too perfectly paced to be an actual problem. Details on car. tuned? modified at all?

 

[robmustang201528]

Vortech jt trim v7
8 rib pulley upgrade
Id1000 injectors
JLT intake for vortech kit
VMP boost a pump
Beefcake torque booster kit (turbosmart hypergate45 wastegate)
Turbosmart e-boost boost controller
Lund tune

 

[Jay-rod427]

The sweeping rhythm is just too perfect. Especially since the idle doesn't jump up and down too drastically. Ask Lund. Did it ever quit after driving a bit?

 

[robmustang201528]

Too perfectly placed? It normally reads in between 13 to 14 at idle

 

[robmustang201528]

No it never quit. I drove it back home. I was only 2 min from home after I got gas. Scared to drive it.

 

[ugstang17]

Verify your MAF is installed in the correct direction would be first to check just to be safe. Likely not since it waws running fine before hand. Second would be that you have a possible air leak after the MAF that is sucking in air unmetered and the trims are attempting to correct for it. The O2's are working correctly or you would likely have a CEL. So start first by checking to see if your MAF sensor is correctly installed in the air path, and then look for loose clamps on the intake tubing after (before would be metered) the MAF and all the way u to the TB. Best place to start.

Or if it was installed by someone locally take it back to them and have them make it right.

 

[Tommy V]

Probably did not drive it far enough for a cel to come on.I would get a sample of thst fuel u just got and see if it has a shit load of water in it.Very easy to do right at the fuel rail.

 

[robmustang201528]

Ok yeah It just started doing that after I got gas smfh. No light. I drove it 2 min up the road back home after it started driving funny. Air fuel started going crazy.

 

[Jay-rod427]

Too perfectly placed? It normally reads in between 13 to 14 at idle

I mean paced. It jumps up and back down and back up at a perfect pace/rhythm. It's not erratic.

 

[ENPhoto]

I would:

- Get a sample of the fuel and confirm that it isn't the issue.
- Like UGStang17 mentioned, I would also check for air leaks. I really don't think that it's an o2 sensor issue. If you have an NGauge installed, you can check your MAF and o2 readings to see in depth what's going on.

but...I would:
- Contact Lund and tell them what's going on. they will probably ask you do do a part throttle drive log and send it to them.

Could be a few different things. Trust your tuner.

 

[robmustang201528]

I'll send lund a email. Dakota thinks it a 02 issue. I have to send him a log. Headed to the shop in a few to see what's going on. I noticed my tail pipes tips are really black. I don't know if that has anything to do with this issue. I hoping it's a pipe charge pipe thats loose. I checked all the pipes that I can see from under hood. Maybe a pipe came loose from the intercooler. Surging like crazy. I don't wanna drive it . Gonna have it towed

 

[robmustang201528]

I Let the car run a little bit before I put it on the tow truck. A check engine light popped up. Cylinder 2 misfire . Just drained the fuel. Put some 93 in it. Same shit. Doing a data log with lund now. Pipes are tight , fresh fuel is in there... I emailed Lund earlier said it could be the 02 sensor.. waiting to hear back from lund now. What do you guys think?

 

[robmustang201528]

Its was the o2 sensor bank1 sensor 1

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