PMAS intake w/tune stalling on warm start

[GregO]

This is the MAF sensor that PMAS supplied with my air intake kit.

Your picture of the MAF sensor is stenciled as MC11-2 whereas my PMAS no tune MAF sensor is MT13-2.
That’s enough to raise one’s eyebrow.
I think you have a GT350 No tune MAF sensor on your hands. Not the GT 5.0

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[NGOT8R]

Your picture of the MAF sensor is stenciled as MC11-2 whereas my PMAS no tune MAF sensor is MT13-2.
That’s enough to raise one’s eyebrow.

Yes, I took notice of that, however; the MC11-2 is showing to be the sensor for the GT350 PMAS air intake kit. My guess is that they each use a different resistor; possibly due to different air flow rates between the GT and GT350 intake manifolds. Something else that I didn‘t think about before is, I’m using the 20* angled coupler between my throttle body and air intake tube for clearance. I’m wondering if this could also be causing additional turbulence? It seems as though most PMAS users who have encountered issues are having really low idle or stalling problems, whereas I am experiencing the opposite. I really am baffled by this.

 

[WildHorse]

I’m using the 20* angled coupler between my throttle body and air intake tube for clearance. I’m wondering if this could also be causing additional turbulence?

No.

 

[WildHorse]

Regardless, none has to do with his problem. I'm beginning to think it's just his MAF getting to heat soaked. Keep your hood open for an hour after you shut off the car then start it up. Keep in mind this is all speculation cause I don't have a PMAS MAF.

 

[NGOT8R]

Copy that WidHorse. I’ll give that a try.

 

[txpat3]

Thanks for the replies! Does anyone know what the "tune required" MAF sensor number should be for a GT? I should check to ensure mine is correct and will also try to level out the orientation of mine a bit as I think it dips a bit lower than your picture.

 

[NGOT8R]

Thanks for the replies! Does anyone know what the "tune required" MAF sensor number should be for a GT? I should check to ensure mine is correct and will also try to level out the orientation of mine a bit as I think it dips a bit lower than your picture.

I did a little more research and it appears that the OEM 5.0L V8 and 5.2L V8 engines use the same MAF sensor.

 

[GregO]

What exactly is PMAS changing in their sensors to fool the ECU’s transfer function ?
PMAS has a different No-Tune MAF sensor part number for the Gen2 5.0, Gen3 5.0 and VooDoo 5.2 where as Ford uses the same sensor for all three including the EcoBoost.

 

[Tang]

I've had my PMAS for years no problems except one time I pulled out of a driveway with a little drop off at the curb and I heard a clank, car started breathing weird. After a few miles I pulled over opened her up and the silicon connector from the TB to intake had come undone. Check your hose clamps

 

[NGOT8R]

I've had my PMAS for years no problems except one time I pulled out of a driveway with a little drop off at the curb and I heard a clank, car started breathing weird. After a few miles I pulled over opened her up and the silicon connector from the TB to intake had come undone. Check your hose clamps

This ^. I check mine after every drive. I use a three finger tight method with my 1/4” drive ratchet. I’ve never had any couplings pop off, but I have gotten very slight movement in the worm gear clamps from time to time.

 

[NGOT8R]

I just emailed the PMAS Tech Dept. regarding my hanging idle issue. I also inquired about the use of different MAF sensors for their 5.0L V8 and 5.2L V8 engine (no tune required) air intake kits. I’ll give it until mid week and attempt to follow up with a phone call if I haven’t heard anything back from them by then. Hopefully I’ll have some answers soon.

 

[WildHorse]

What exactly is PMAS changing in their sensors to fool the ECU’s transfer function ?

Airflow to voltage, single transfer.

 

[NGOT8R]

Here is my email exchange with the PMAS Tech Dept.

Me:

Hello,

I recently purchased one of your no tune required PMAS air intake kits for my 2019 Mustang Bullitt, which shares the same intake manifold, throttle body and CAI kit as the GT350. I have a few questions regarding my PMAS kit.

1. Is there any reason why I am experiencing hanging idle for several seconds (about 1800 rpm), when I push in the clutch to come to a stop, before the idle returns to normal (750 rpm)? Note: Before each drive, I check that all hose clamps are tight and even though the PMAS has only been on the car for about 1000 miles, I’ve also cleaned the MAF Sensor using MAF Sensor Cleaner.

2. I’ve done some research and noticed that the Ford 5.0L V8, 5.2 L V8 and Ecoboost engines share the same factory MAF Sensor. I’ve also talked to other PMAS owners, who say that their no tune required GT MAF Sensor is the MT13-2 , whereas mine is the MC11-2. I was just curious as to why different sensors are used, given the fact that Ford uses the same sensor for the three aforementioned engines.

3. I talked to my tuner about the issue and was told that it was a PMAS turbulence issue and there was nothing that could be done via tuning to correct the issue. Is there anything that can be done to correct my hanging idle issue?

PMAS Tech:

Are you positive your car uses the exact same airbox as the GT350? All of the maf sensors are the same but it's the airbox that's different. Different air boxes will make the maf have a different output. Our GT350 kit is designed to replicate the OEM 8V21 maf when installed into the GT350 airbox. This is the reason the PMAS 18GT kit has a different maf than the PMAS GT350 kit. The OEM maf sensor is the same but the factory air boxes are different.

All of this assumes you are using a "no tune required" intake where we include a maf sensor. If you are having this tuned you can simply use your OEM maf sensor in our housing and use the supplied maf data on our site to eliminate a possible mis-match. I'm not sure what turbulence your tuner is referring to? Our maf housing/filter combination has more laminar flow than the OEM intake system.

 

[WildHorse]

Another dumb question on my part based on your correspondence with PMAS. Is your rev matching on or off?

 

[NGOT8R]

Another dumb question on my part based on your correspondence with PMAS. Is your rev matching on or off?

There are no dumb questions here, LOL! Yes, I’ve tried running with rev matching on and off and the issue is still present.

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