suby 2.5 MAF

alaskadan · Posted: Fri Jul 03, 2015 7:59 pm Post subject: suby 2.5 MAF

What does it mean when your suby only runs when you disconnect the MAF? I can fire it up and then plug in the MAF and it kills the engine.

jmranger · Posted: Fri Jul 03, 2015 8:40 pm Post subject:

My guess: bad MAF or MAF wiring. Same thing as when you unplug your O2 sensor and suddenly, the van runs better. The ECU designers integrated a fail-safe mode that allows the vehicle to run (albeit non-optimally) that is triggered when the sensor isn't present - but the vehicle may not run at all when the sensor is stuck at either end of the sensing range and is providing invalid input.

AKWesty · Posted: Fri Jul 03, 2015 11:27 pm Post subject:

I am not positive but I am pretty sure you can bench test your MAF with a meter. Haynes or Chilton manual will have it. May just need a good cleaning. Good Luck.
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Zeitgeist 13 · Posted: Sat Jul 04, 2015 12:50 am Post subject:

I'm sure there's a website for these kind of off topic questions

insyncro · Posted: Sat Jul 04, 2015 2:36 am Post subject:

alaskadan · Posted: Sat Jul 04, 2015 7:01 am Post subject:

Ok. Didnt realize talking about our various engine conversions was off topic. Ive never had good luck on the yahoo site but i will go there.

alaskadan · Posted: Sat Jul 04, 2015 7:14 am Post subject:

As usuall that !#&%? site wont let me create an account.

vanis13 · Posted: Sat Jul 04, 2015 8:05 am Post subject:

seems like the folks on the subaru yahoo groups love to talk (sometimes about the same thing over and over) which is good since the search function sux on yahoo. But I'm sure you'll get a response.

in my experience and bad or dirty MAF. when I did my transplant the MAF was in the elements for a few months while I did the conversion and then the engine didn't run well with it connected. Before I replaced it I cleaned it with this available everywhere -

http://crcindustries.com/ei/product_detail.aspx?id=05110

Also, when testing my engine I had the MAF connected but not in the intake airflow, the ECU didn't like that and the engine ran bad when connected like that and good when I disconnected the MAF.

Image may have been reduced in size. Click image to view fullscreen.

Also, when testing my engine I had the MAF connected but not in the intake airflow, the ECU didn't like that and the engine rad when I disconnected the MAF.
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dobryan · Posted: Sat Jul 04, 2015 8:09 am Post subject:

vanis13 · Posted: Sat Jul 04, 2015 8:30 am Post subject:

AKWesty · Posted: Sat Jul 04, 2015 8:52 am Post subject:

Sodo · Posted: Sat Jul 04, 2015 9:33 am Post subject:

I'm interested.

OP should re-title post "Vanagon Suby 2.5 MAF".
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dobryan · Posted: Sat Jul 04, 2015 9:54 am Post subject:

insyncro · Posted: Sun Jul 05, 2015 4:57 am Post subject:

The title and question phrased have nothing to do with Vanagons, it has to do with a part of Subaru engine.

The answer will be found quickly in any Subaru forum out there.

Since it isn't running properly, what codes are being thrown by the ECU.
If the answer to this question is ?????....it won't matter what site you are on.

Who did the wiring conversion?

Yes to above, sensors can be bench tested and all wiring should be also....regardless of brand or site you are on.

djkeev · Posted: Sun Jul 05, 2015 5:18 am Post subject:

Not at all an off topic question.

We deal with Vanagons, pure factory setups, Air Cooled, Diesel, and Gasoline......... be they North American fuel injected or European carburetors,
Add into this factory mix we add the vast array of power plant "upgrades" and we've got quite a spectrum!
We are even dipping our toes in TESLA transplants now!

You will however find knowledge about Subaru power plants and the various running nuances limited here seeing as many of us haven't ever touched or seen one.

The recommendation to seek out a Subaru forum makes sense, not because such a question is off topic here but rather our collective knowledge base is severely limited on Subaru engines.

In the same manner we often advise our 2.0 Air Cooled friends to visit the Type 2 Bay Window forum for their knowledge on these engines is vast compared to most members here who drive Water Cooled units.

Don't let one comment scare you away.
We are not a negative site though some seem to feel that way.
I've noticed that Other sites practice very heavy handed editing, we edit but more to keep on topic and to create a searchable data base at the same time.
Sure, heavy handed editing does make a more mellow place but it also eliminates certain individuals who have a LOT of knowledge that many /most "social" posters may not have.

There seems to be a need in some to bash place "A" to make place "B" look better. There is no need to bash, just accept that each place is different and meets ones particular needs.

And Yes, I'm on the facebook pages among others but this is home right here where the real knowledge lies.

In my personal observations.......... On any other Vanagon site or forum...... Thesamba is almost always referred to as the place to go to get the answers to life's perplexing questions.

Dave
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alaskadan · Posted: Sun Jul 05, 2015 7:14 am Post subject:

No problem here. I have tried to sign up on the yahoo a few times and to no avail. . The wiring is suspect at this point. I had someone do my harness who has done harnesses before and used to work for a conversion shop. I now question that decision. Though he wasvery helpfull in many ways. So now ive been looking for a wiring diagram so i can pull it out and go through it. When plugging in a scanner it just reads ERROR. Crying or Very sad

. Can anyone steer me towards a wiring diagram for an 07 2.5 conversion? Thanks.

insyncro · Posted: Sun Jul 05, 2015 7:24 am Post subject:

Error means pin test every wire and double check the work done, sounding suspect.

I hate to say it but the wiring diagrams are right in the yahoo group pages and easily downloaded.

If yahoo is not cooperating, time to start monitoring scripts on your computer browser of choice and blocking them. Done deal...surf with ease.

jmranger · Posted: Sun Jul 05, 2015 10:35 am Post subject:

insyncro · Posted: Sun Jul 05, 2015 1:26 pm Post subject:

Nimbus'87 · Posted: Mon Jul 06, 2015 6:07 am Post subject: Subie MAF...

Don't know if your a FaceBook user or not.
A couple of groups that might help you:
Subaru Powered Volkswagens, &

Modified Subaru Wiring Harness Community

Not FB but Shoptalkforums.com has knowledgeable peeps too.

G'luck. SS.
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