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Old 12-09-2010, 10:33 AM   #1 (permalink)
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Default MAF Adjustment - Can anyone explain this link?

My rig is running rich with no codes. I have the mass airflow sensor in the photo on the left. Are the two photos an "either or scenario", or do they both apply; meaning I should be looking for something in the photo on the right as well?

Last question, WHERE is "the Throttle Pot on the side of the plenum"?

I'm sure that when a few of you provide clarification I won't be the only walking out the door multi-meter in hand to warm up my rig. Thanks all! Here is the link.

RPi Engineering - V8 Engines
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Old 12-09-2010, 10:46 AM   #2 (permalink)
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You have a flapper style air flow meter? Odd. those were used on the earliest 87-88 3.5 trucks.

the co adjustment is a small bung you knock out on the back side of the afm. I'll get you a couple pictures in a minute or two.


throttle pot is on the opposite side of the throttle cables.

the CO adjustment will make a difference too. I just replaced my tps. It had a few bad spots in it.
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MAF Adjustment - Can anyone explain this link?-dsci0570.jpg   MAF Adjustment - Can anyone explain this link?-dsci0571.jpg  

Last edited by albani; 12-09-2010 at 10:56 AM. Reason: pics
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Old 12-09-2010, 11:03 AM   #3 (permalink)
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Hey Albani,

Thanks for the reply. I have the MAF pictured at the link on the left for sure. The TPS I thought was a Throttle Position Sensor - not the Throttle Pot.

So, how does hooking a multi-meter to the MAF while adjusting the pictured TPS that you posted make any difference in the mixture???

Thanks for your time and the photos. Anyone else?
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Old 12-09-2010, 11:05 AM   #4 (permalink)
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If you don't have the ability to monitor everything that's taking place, monkeying with the MAF is usually a bad thing to attempt.

It's highly unlikely that you have a flapper, versus a hotwire MAF.
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Old 12-09-2010, 11:06 AM   #5 (permalink)
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Throttle pot(entiometer) and throttle position sensor are the same thing.
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Old 12-09-2010, 11:16 AM   #6 (permalink)
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Quote:
Originally Posted by RedRover2468 View Post

I have the MAF pictured at the link on the left for sure.
Not if you have a stock NAS '93 RRC. There were no NAS trucks imported with the flapper EMS.
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Old 12-09-2010, 11:42 AM   #7 (permalink)
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PTschram,

I've got the MAF that's pictured in the photo on the left at that link with the K&N Airfilter attached to it - and I'm going to monkey with it.

What I'm wondering is will adjusting the Throttle Pot make a difference in the MAF setting? This tech spec seems to say you can make an adjustment to the MAF with a multi-meter in hand to "monitor all that is going on".

Can anyone chime in on how to DO this versus the reverse? Like most of us, we're here for help and to provide help when able. I live in AK - short of putting the truck on a barge, figuring it out myself is the only way it will get done.

Looking forward to posts from anyone that can help. Thanks!

P.S. The photo in the left means at the link - not in the photo on the left posted by albani. I have a hotwire MAF
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Old 12-09-2010, 12:16 PM   #8 (permalink)
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OK, there are two pics on Chris' page. The first one has a flapper on the left!

I have only done this a few times with mixed results and I've bee able to see in real time the changes in oxygen sensor output.

Typically, the problem is not with the MAF, nor the TPS, but injectors or oxygen sensors, or both.

Check fuel pressure first.
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Old 12-09-2010, 01:15 PM   #9 (permalink)
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what PT said. I wouldnt monkey with the throttle pot. it doesnt have an adjustment for a reason. (technically you *can* drill out the mounting holes but I do not advise it unless you *know* what you are doing)


to mess with the CO values you knock out the hole. counter clockwise for less, clockwise for more. you need a DVOM (digital volt ohm meter) connect it to the two smaller wires in the bunch of 4.they both blue in them. the other 2 wires are slightly larger. ( i do not remember the colors exact!)
Do it with key on engine off. set it to 1.8v if you have emissions and or cats. 1.0v otherwise.


(My truck is set for non cats.)
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MAF Adjustment - Can anyone explain this link?-dsci0575.jpg   MAF Adjustment - Can anyone explain this link?-dsci0576.jpg   MAF Adjustment - Can anyone explain this link?-dsci0577.jpg  
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Old 12-09-2010, 03:01 PM   #10 (permalink)
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PTS, what web browser are you using? The link loads the page with a hotwire MAF on the left - Note: K&N Air Filter Attached to it.

I think the TPS was a rabbit trail, from "Chris' Page"

The values that you are trying to achieve are below and these are adjusted by the screw on the side of the airflow meter.


Any idea where that screw is? Thanks guys. Thank you for the photos too, Albini.


MAF Adjustment - Can anyone explain this link?-hotwire.jpg
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Old 12-10-2010, 03:52 AM   #11 (permalink)
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Scroll up to identifying your injection type, the flapper style MAF is on the left, hotwire on the right.
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Old 12-10-2010, 12:37 PM   #12 (permalink)
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Another Rabbit Trail. As I said I have a hotwire - the one on the left - with the K&N Filter attached to it as mentioned also twice. The one on the left in the photo as this link first mentioned loads in most browsers shows the MAF on the left.

This link
RPi Engineering - V8 Engines

Page loads hotwire on the left.

Now that we all know what kind of MAF I have - does anyone know where "the screw on the side of the airflow meter" is to make adjustments to my hotwire MAF?

Thanks.
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Old 12-10-2010, 01:20 PM   #13 (permalink)
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Quote:
Originally Posted by RedRover2468 View Post
Another Rabbit Trail. As I said I have a hotwire - the one on the left - with the K&N Filter attached to it as mentioned also twice. The one on the left in the photo as this link first mentioned loads in most browsers shows the MAF on the left.

This link
RPi Engineering - V8 Engines

Page loads hotwire on the left.

Now that we all know what kind of MAF I have - does anyone know where "the screw on the side of the airflow meter" is to make adjustments to my hotwire MAF?

Thanks.
At the top of that page, it says "which one is yours" and the mass airflow meter on the left is a flapper type, NOT a hotwire, SCROLL UP from the picture you're talking about!

If you look at the outlet side of the MAF, there is a round protrusion covered with an aluminium plug, pull that plug and there will be a female hexagonal screw that allows for the adjustment.
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Old 12-10-2010, 01:34 PM   #14 (permalink)
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Hey PTS,

There is no reason to scroll up. The tech info is right there, and I know what MAF I have, anyone that reads the thread will see that I've known that from day one.

Also, anyone that clicks on this link RPi Engineering - V8 Engines will see a hotwire on the left. I mentioned K&N filter four times and even showed you a screen shot of how the page loads.

Sounds like you'd rather argue with someone then anything else. Also, caps is the equivalent of yelling and so are exclamation marks. Go be rude to someone else.
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Old 12-10-2010, 01:45 PM   #15 (permalink)
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The very first picture on that page of a mass airflow meter has a flapper-type mass airflow meter. I am not hallucinating this.

I tried to help you by describing how to adjust the thing and how I don't think it's a good idea, you're on your own. Go fuck up your MAF yourself.
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