MPI tuner random idle?

[Kooldino]

Ok, I saw this happen a few weeks ago at the NEPOC meet on acid's car...and it happened to me for the first time today.

I started the car up. All was fine.

A few seconds later, BAM...A:F ratio goes to 17.xx...then back to 14.xx...it continues to bounce around for 15 seonds. Then it finally settles. Then it does it again for awhile...then goes back to normal. Just like I saw on Chas's car.

The weirdest thing it's done before this at idle was go lean to 17.xx, and SLOWLY work it's way back to the 14's. Or if I blip the throttle, it normally wakes it up and fixes it.

Any input?

 

[LinuxRacr]

I've seen this before as well.

 

[Kooldino]

I've seen this before as well.

Which, the random lean/stoich back and forth?

 

[DooMer_MP3]

Do the engine RPMS bounce up and down as well? If so, my fiancee's old MX-6 had an idle problem, when cold, where it would bounce from 1k RPMs to 3k RPMs as if somebody was pressing/depressing the accelerator in neutral repeatedly, as if the car was trying to challenge people to a race . Don't know if its related at all, or an MPI thing.

Chris

 

[505zoom]

I have seen similar readings from my WBo2, but never that extreme. My A/F will *sometimes* go up to like 15.7, and then go back down to 14, and then come back up to 14.7... But never as drastic as you're describing. It only does it at idle too, when I give it a little gas it stops and goes back to normal.

 

[LinuxRacr]

I have seen similar readings from my WBo2, but never that extreme. My A/F will *sometimes* go up to like 15.7, and then go back down to 14, and then come back up to 14.7... But never as drastic as you're describing. It only does it at idle too, when I give it a little gas it stops and goes back to normal.

This is what mine does now. Nothing extream as what used to happen.

 

[Kooldino]

This is what mine does now. Nothing extream as what used to happen.

So yours did extreme things BEFORE the MPI tuner?

505zoom - mine was doing what you described forever. Even when I had an FMU, IIRC.

Doomer - yes, I forgot to mention, the RPMs will move between ~500 and ~1K rpm.

 

[505zoom]

Sorry, a little off topic, but are any of you guys using your WBo2 output wire for the MPI A/F input? I was thinking about switching mine to see if that helped this... It is the MPI brown/black wire, but it can only see a 0-1v source. I think the AEM that kooldino and I have has both 0-5v, and 0-1v outputs on it... Not sure how your TechEdge works Pat, but see if it has a 0-1v output on it.

 

[Little Beavis]

Mine bounces some. I notice it is most significant when the car is "kind of warm". Where the car was run not long ago, but it is cold enough that the temp gauge doesn't read. Then I will go to a 16.0:1 or so and loose some idle quality. I simply added some fuel at idle and now, just as I did before the MPI with my FMU, I idle at 13:1, and when this "bump" happens, I go to about 14.7:1, so it is all good, other than a rich idle, but as I said before, I was idling 12.5 - 13:1 with my FMU as well.

 

[PaulMP3]

mine does the same thing. My idle doesnt jump around to much, besides when the fans come on. I have seen mine go up to high 16's usually it jumps from 14.7-15.5. Mine just started doing this a few months ago, when i had the FMU and the mpi tuner it would stay 14.7-15.0:1 This is a recent issue with me. I want to reset my ECU, but i am afraid i will have to retune my car if i reset it. MY ecu liked to pull a lot of fuel in the begining.

 

[ViksMSP]

So does this have anything to do with ECU- relearning thingy?? I remember a while ago that was the big issue, that ECU would relearn and you'd have to add fuel all the time. This doesn't have anything to do with it, or does it?? Kind of like a fight between a ecu and mpi??
BTW whatever happened to the whole relearning, do any of you still add fuel? Wasn't it you 505zoom that was worried about it when Emanage was beign reserached? Did Nick find a way to go around it.
Sorry to go off topic.

 

[acidbug]

Ok, I saw this happen a few weeks ago at the NEPOC meet on acid's car...and it happened to me for the first time today.

I started the car up. All was fine.

A few seconds later, BAM...A:F ratio goes to 17.xx...then back to 14.xx...it continues to bounce around for 15 seonds. Then it finally settles. Then it does it again for awhile...then goes back to normal. Just like I saw on Chas's car.

The weirdest thing it's done before this at idle was go lean to 17.xx, and SLOWLY work it's way back to the 14's. Or if I blip the throttle, it normally wakes it up and fixes it.

Any input?

I don't have a wide band..so i really don't know what the a/f are acutually...but yes..i have had this happen...and it happens..when the car is warmed up..and i have been sitting for over 10-15min.

If i blip the throttle it wakes up..as kooldino put it..

Nick has been tellin me it's probably just a vaccum leak. I have checked all my vaccum lines..and i will be pickin up some carburator cleanor..and checkin my pipes.

Chas

 

[acidbug]

mine does the same thing. My idle doesnt jump around to much, besides when the fans come on. I have seen mine go up to high 16's usually it jumps from 14.7-15.5. Mine just started doing this a few months ago, when i had the FMU and the mpi tuner it would stay 14.7-15.0:1 This is a recent issue with me. I want to reset my ECU, but i am afraid i will have to retune my car if i reset it. MY ecu liked to pull a lot of fuel in the begining.

I tried resetting the ecu..and it don't help at all!

Chas(pow)

 

[Kooldino]

Sorry, a little off topic, but are any of you guys using your WBo2 output wire for the MPI A/F input?

Wouldn't an input wire to the MPI be more helpful?

I was thinking about switching mine to see if that helped this... It is the MPI brown/black wire, but it can only see a 0-1v source. I think the AEM that kooldino and I have has both 0-5v, and 0-1v outputs on it...

I have a UEGO, not an AEM. I don't recall it having extra outputs.

 

[505zoom]

Wouldn't an input wire to the MPI be more helpful?

That's what I said. Output wire from the gauge to the input wire on the MPI.

I have a UEGO, not an AEM. I don't recall it having extra outputs.

I think it is the same setup. Mine is the AEM UEGO. I think the gauge is the only difference. Mine has a blue output wire, and a white output wire. I know that one of them is the user programmable 0-5v output, but I can't find my book to confirm if the other one is a 0-1v output. I think it is.

 

[LinuxRacr]

Dana, my idle wasn't really extreme before the MPI Tuner, only in the beginning when my solder points sucked. Rich, my TechEdge does have a narrowband-mimiced output. From what I have read about it, I'm not sure how good it works. I hear version 2 of the TechEdge is a lot better, and has a lot of stuff working great!

 

[Bigg Tim]

Not sure if mine is doing this, I don't really pay THAT close of attention to the idle. I only notice my idle changing when the fan, or some other electrics, come on. It may be dipping a little, but nothing that is a big deal to me. I'll have to look at it closer and see if it's doing this.

 

[acidbug]

Today i went out tuning..and started tuning my idle..i tuned for about 1hr. I finally got it to start acting right..The numbers i had in there were just to big.

Will see how tomm goes.

Chas

 

[KzA]

yea get that workin and post those maps..I'm going up to Long branch in a bout a week for some major tuning, since I'll have my MP3 ecu. My bad P5 ECU idle will now be gone, so I want to get it perfect again with the stock ecu

 

[acidbug]

Here are the new maps i have created. My idle feels much better..Even though sometimes my idle still runs lean..I haven't tried putting 0's yet..b/c i had it stall couple of times..

Chas