speed density to MAF A9L

M

mo925415

New Member

Jun 18, 2020

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San Francisco

Jun 18, 2020

#1

• Jun 18, 2020

• #1

I have an 86 mustang, just threw in an A9L with a 19lb maf sensor, the car idles rough and sounds like the timing is off, does it need a tune or what? bbk shorty headers, bbk cold air intake, everything else is bone stock but i have a trickflow upper and lower intake and an e303 cam i want to throw in. how can i go about this. im new to this .

 

2000xp8

SN Certified Technician

Aug 8, 2003

8,016

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NJ

Jun 19, 2020

#2

• Jun 19, 2020

• #2

Clarify "just threw in".
There is a process to convert to mass air, done right, the car will run fine.
Done incorrectly...

 

General karthief

wonder how much it would cost to ship you a pair

5 Year Member

Aug 25, 2016

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polk county florida

Jun 19, 2020

#3

• Jun 19, 2020

• #3

Since you are a new member I don't know if you have the 'box' at the bottom of this thread. One of the neat things I've noticed over the years is when a thread title is descriptive enough there are thread posts in the 'box' that are similar and can be used to help resolve a similar problem, if, of course, there is a 'fix' posted.
Similar threads
Speed Density And Maf
Dec 25, 2014
Speed Density to MAF
Jul 12, 2008
1988 speed density to 93 MAF conversion.
Mar 18, 2008

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,224

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Massachusetts

Jun 19, 2020

#4

• Jun 19, 2020

• #4

Was the original 86 car a 5-spd?

Did you move the pins on the ECU connector? Did you run the additional 2 wires for the VSS sensor? We need more details as to how you did the conversion

 

M

mo925415

New Member

Jun 18, 2020

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San Francisco

Jun 21, 2020

#5

• Jun 21, 2020

• #5

Yeah, i did a step by step process, following LMR video, and a few others, the car is an original 5 spd as well.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,224

17,909

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Massachusetts

Jun 21, 2020

#6

• Jun 21, 2020

• #6

Dump the codes. Let’s see what the ECU doesn’t like

 

M

mo925415

New Member

Jun 18, 2020

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San Francisco

Jun 23, 2020

#7

• Jun 23, 2020

• #7

Just saw that my old computer has an AOS Super chip would this be compatible with the A9L ECU and could this be a reason for a rough run without it

 

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vristang

15 Year Member

Mar 31, 2005

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Jun 24, 2020

#8

• Jun 24, 2020

• #8

That is Old School!

If that is the ecu you removed, then it shouldn't affect how the car is running now.

I would suggest pulling codes, and doing a part number check for the injectors and the MAF housing/sensor.

That setup should not need a tune, so most likely something is off, either a part mismatch or a conversion/wiring issue...

 

M

mo925415

New Member

Jun 18, 2020

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Jun 24, 2020

#9

• Jun 24, 2020

• #9

appreciate that thanks for the info.

 

Blown88GT

Founding Member

Nov 13, 1999

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Palm Beach Gardens, FL

Jun 24, 2020

#10

• Jun 24, 2020

• #10

mo925415 said:

Just saw that my old computer has an AOS Super chip would this be compatible with the A9L ECU and could this be a reason for a rough run without it

Click to expand...

Probably not compatible. I would put the DA1 with Superchip back in & remove the MAF.