MauiMazda2

OK long story short. Dealer took 3 months to install new injectors.

Drove it away and gave it a push after it had warmed up got a misfire that went away and has NOT been back at all.

At same time as misfire (ie about 10 mins after getting it back and 4 minutes into some hard driving) got a:

P0661 Intake Manifold Tuning Valve Control Circuit Low Bank 1


Cleared this and then it was fine for a while. Got it on the open road pushed it code again.


Cleared drove it a bit more. Pushed - NO CODE thought I had cured it.

The when quiet driving got original code PLUS:

P2259 Secondary Air Injection System Control B Circuit Low


OK question time. Could it be a problem with a bad connection or... any ideas appreciated and yes I have searched lots but this seems to be a fairly unique progression (grammar police please note "fairly unique"!!)

Secondly is it OK to drive for a while - ie about another 150 miles with little HARD driving??

TIA for any thoughts.

Steve

RIWWP

iTrader: (2)

P2259 is only related to cat health, the air injection pump will only run when the cat is cold. It's won't cause any long term problems with your engine, just slightly reduce the cat's lifespan.

If you haven't done a NVRAM reset since the injectors were installed, it should be done, since they probably change the fuel trims at least a bit.

MauiMazda2

Thanks for that RIWWP (what the heck do I call you).


Just double checking - that is the 20 times stomp right?

Will do it in the morning.

Still worried about the original P0661 though - presume that is not causing any real problem but just means the engine running slightly sub optimally.

Thanks for the steer.

Steve

RIWWP

iTrader: (2)

20 stomps within 8 seconds of the key going to "on".

If P0661 shows back up, then you will have some troubleshooting to do. If it doesn't, I wouldn't worry about it.

MauiMazda2

Well "the Stomp" cleared it for a few days and then both codes cam back. After that got both codes happening every day or so (50-100 miles on average (ish)) but now it is just showing the P0661 Intake Manifold Tuning Valve Control Circuit Low Bank 1

The P2259 Secondary Air Injection System Control B Circuit Low seems to have gone for now!!!

The latest thing is I noticed it seems to be guzzling oil. (No noticeable leakage.)

I have never noticed appreciable oil usage (suspect I was nearer the 1 quart = 3,000 miles end of things).

Now I have got through a quart in about 600 miles.

Taking it back to Dumb and Dumber dealership next week just wondered if u had any ideas where to point them.

Grateful for any ideas.

TIA for any thoughts.

Steve

Williard

iTrader: (18)

This may help but it may not. Disconnect the battery completely. Remove the "room" fuse. Hold the brake pedal down until your brake lights stop illuminating. Wait 30 seconds then reconnect your battery and try the 20 stomps again.

MauiMazda2

Willard first things first - just double checking this is not an April the 1st stunt!

If genuine :-) what is this doing?

More fundamentally why is this happening? Could it not be a genuine problem? The oil consumption makes me wonder.

Anyhow if you promise I do not have to do this naked standing on one leg I will give it a try tomorrow!

Thanks for the input.

Williard

iTrader: (18)

It was a trick told to me by a mazda tech in TX. He told me that SOMETIMES the 20 stomp alone isn't enough to clear the memory. So you remove the room fuse and disconnect the battery then hold the brake pedal down in order to drain the remaining power. He told me that this way it removes all possibility of the code being stored.

RIWWP

iTrader: (2)

The difference is that there are multiple different sets of learned values in the ECU, and not all of them are cleared by any 1 procedure. Disconnecting the battery clear some, resetting the NVRAM with the 20-stomp clears others.

The removal of the room fuse and the press and hold the brake pedal isn't really necessary though. Pulling the room fuse can clear some values by itself, and are the same values cleared by disconnecting the battery (both do the same thing of removing the trickle power supply to that part of the ECU). Doing both at the same time is redundant and pointless. Pressing on the brake pedal with the battery off is also needlessly redundant. All it's doing is applying an extra load on the circuitry to ensure that the capacitors are completely drained. This happens anyway after ~30 seconds of disconnect time, if not sooner.




However, after all of that, neither code has anything to do with any of the learned parameters. My NVRAM reset was a side comment regarding the new injectors, and not the codes.

Causes for P0661:
Causes for P2259
Both are more likely to be related to a technician mistake re-assembling the upper engine bay than anything else, if they are related to the injector install at all.

MauiMazda2

Ohhhhhhhhhhhhhhhhhhhhhhh


OK bugger bugger bugger bugger bugger bugger bugger.

Running fine with CEL on and just after warmed up (about 1.2 miles so early warm up) suddenly goes rough and then stalls. I try restarting and it keeps nearly catching.

"Fortunately" this car used to stall a lot and I know when I am flogging a dead horse. Leave it for an hour and manage to start it up and drive it home.

Checking with ScanXL I still have P0661 Intake Manifold Tuning Valve Control Circuit Low Bank 1 and I now have (surprise surprise) P0302 Cylinder 2 Misfire Detected.

Now I MAY be able to get it to the dealer if I keep the revs up (over 2k) which I did by doing a left foot on the brake pedal start.

It is 10 miles. Will I do much damage to the engine, cat or anything else? And does the team think this is related to P0661 code.

By the way guys thanks very much for your help with this.

Steve

PS I have had a nasty misfire before - this seems more gentle. But it still freaking stalls :-(

EDIT: PPS Just wondered if excessive oil consumption might fit in here. Oh and if you feel like it ... what does "Intake Manifold Tuning Valve Control Circuit Low Bank 1" REALLY mean. I have not noticed a real drop in performance. Oh sorry RIWWP you have already put up a lot of info. Thanks.

PPPS Given that the P2259 has gone away... Is that indicative of a poor connection? Is there any reason other than that for these two codes to appear? Are they related? Would poor wiring in that area cause a misfire and any chance excess oil use related to bad electrical connection? It is just looking at those two codes and the fact that one went away ... and that the other one stays away for 30-50 miles after a reset - well that would fit with a lose connection... I am clutching at straws.

EDIT: 18 July

Apparently the new problem was caused by TWO coils that failed simultaneously - just thought I would add this in case anyone looks at this thread. Coils back with BHR will report final conclusion if I remember.