speed density to MAF A9L

[mo925415]

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]

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

 

[General karthief]

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
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[Mustang5L5]

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

 

[mo925415]

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]

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

 

[mo925415]

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

 

[vristang]

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...

 

[mo925415]

appreciate that thanks for the info.

 

[Blown88GT]

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

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