219A Code Help

[Aleckb]

A few weeks a ago I noticed a ticking sound coming from the drivers side, used a stethoscope and didn't hear anything internal and it sounded like an exhaust manifold bolt.

Then I started having problems with oil pressure..that is on another post. But, during all the work on the oil pressure problems I noticed the ticking stopped...which is obviously not a bolt, since they don't fix themselves, so I assumed I have valve train problems, which undoubtedly will come back.

The oil pressure is fixed...no codes but now getting a 219a code which is an air/fuel inbalance in bank 1. Idle is perfect but truck misfires starting around when shifting into 2-3 gear and at highways speeds. Gas mileage went to crap, barely 12 (was 16-18) now and really bad performance.

Truck was due for a spark plug change at 90K so I did that, put OEMs back in and also changed PCV valve. Plugs didn't look that bad when I pulled them so I didn't think that was the problem but changed them anyways to be sure.


Cleared code but it came back, same thing 219a.

I would be expecting the worse because I did hear the ticking before (It hasn't come back and still sounds quiet with the stethoscope) but was has me stumped is when I put it in tow/haul I can get the problem to stop. If I am just cruising with no load the the misfiring stops and 16-18 mpg again on the highway, however, accelerate, go up an incline and the misfire starts again. Once the load stops the misfire goes away and the mileage goes back up again.

I know there are other things a 219a could be, fuel injector, ignition coils, O2 sensor, valve train...but the tow/haul thing has me thinking it's not the valve train and it's something to do with the MDS?

Which, btw, I do not have the 'ECO' light, not there and can't enable it. Doesn't work and do not have the option to enable it so I don't know if the MDS is coming on or not.

Anyone have any ideas?

 

[Tach_tech]

I would be monitoring for which cylinders are misfiring with a scan tool.

MDS and the eco light will not function if you have a CEL on.

 

[Aleckb]

Thanks...I will do that. Here's another strange thing. It stopped doing it this afternoon. I'll clear the code and leave the scan tool hooked up to see if I can find out what cylinder. I'll post the monitor results when it throws the code again. Appreciate the info.

 

[RedSRT4Me]

Thanks...I will do that. Here's another strange thing. It stopped doing it this afternoon. I'll clear the code and leave the scan tool hooked up to see if I can find out what cylinder. I'll post the monitor results when it throws the code again. Appreciate the info.

I get a 219b which is the opposite bank of cyls. I just replaced my plugs also and the problem is still there.

If you find the remedy I'm sure there are more owners with this problem.

 

[Aleckb]

I get a 219b which is the opposite bank of cyls. I just replaced my plugs also and the problem is still there.

If you find the remedy I'm sure there are more owners with this problem.

Mine is still doing it I really hope it's not worse case scenario, collapsed lifter(s). Read on another forum manual says to run premium gas in it to clean out fuel system. Going to try that next and next time it triggers a code put the results up to see if anyone can tell me anymore. Mine is intermittent, one minute it's fine and I am getting 18-19 mpg then it starts hesitating/missing and I get 12 mpg. Then it's fine again for a while. It does almost seem like bad gas. Idk, I am going to run some fuel system cleaner just to see.

 

[Aleckb]

Must of got some bad gas...ran fuel system cleaner through it and it's back to running like a top.

Going to run a tank or two of premium just clear it all out.