NA tune and MSD 6A work together?

[Rpaillet]

I acquired a 944 NA tune kit and did the installation tonight. The car starts but struggles to rev or hold an idle. Car ran fine before with a steady idle. Checked for vacuum leaks but didn't find anything wrong.

My question is, will the MSD unit work with the MAF?
Thanks
Bob

[v2rocket_aka944]

ditch the MSD...no need for it at all

after installing NA tune you will need to adjust your throttle bypass screw (maybe even the throttle stop) as the MAF lets a lot more air to the engine than the AFM did...you might be running lean with "AFM settings"

[Rpaillet]

Thanks for the reply. I'll give it a try and report back.

[Rpaillet]

Ok, removed the MSD, restored the original coil wiring (black to +, green to -). Engine cranks and tries to fire then stalls. Acts like the AFM connect isn't plugged in. Throttle input doesn't change anything. Any suggestions? I have another good DME, so I don't have to remove the chip, thinking about removing everything to make sure all is good stock without the MSD again.

[Dean924s]

The MSD you are talking about is the Multi Spark units yes? What "kit" are you talking about and what inexactly is in the kit?

[djnolan]

Is the MAF wire (red) connected to coil black?

[onZedge]

Originally Posted by djnolan

Is the MAF wire (red) connected to coil black?

Yes - what djnolan said above. This is likely how the NA Tune will act if you did not connect the red wire to switched ignition (15 circuit - black coil wire), or connected wrong (green coil wire) and damaged it.

To answer your original question: Yes. I am using the NA Tune with 4* cam advance key, Digital MSD 6A, and Brisk Racing EVO spark plugs, late tubular 2.5L NA Y headers (versus cast iron to save weight) and original Y collector with original 2-1/4"-ish exhaust. Had to add four pins and a jumper to the DME to accept the NA Tune chip board. Have all been working happily together, and with zero issues, for about a year now. Smooth with a lot more low end grunt and more power at all RPMs. I'm very happy with this setup.

I need to go up to the 2-1/2" Lindsey exhaust (after the collector), clean or replace the fuel injectors, and install the Innovate Fuel/Air Meter and WB Sensor (in a second bung I added) to finalize it. Always something else to do...



"Dirty" picture - photo after I changed out the head gasket (and a whole bunch of WYIT items) but before detailing.

[onZedge]

Oh, and make sure the white male harness connector pins didn't get pushed out when plugging into the factory 5 pin female connector.

[Rpaillet]

When I took out the MSD and rewired the coil I got the green and black wires switched. After a couple of tries to start the car, I got out the diagrams and found the problem. Red wire was only on the positive terminal but it must have taken out something. My bad. I guess I'll call Lindsey and see if they can help me. Bummer...hope it can be repaired.

[Rpaillet]

Ok, I replaced the sensor and all is well. Dave at Lindsey was very helpful. He told me the sensor was used in 2005 Mustangs and I got one locally. Plugged it in and she fired right up.

I have to say, this has made a world of difference in how the car performs, way better throttle response and pulls like a new car (205K on stock engine). Kicking myself for waiting so long. The NA-Tune is the real deal folks. Cam key next belt change. Also, very easy to install once I got rid of the MSD ignition. Thanks for the help.....Bob

[onZedge]

Follow-up in case somebody else comes across this thread:

The MSD 6A/6AL puts about 530V on the coil primary, so you can't use the coil connection for the N/A Tune red wire. You have to find a switched ignition wire elsewhere (circuit 15; typically a black wire). I used a piggyback faston connector on the G3 spade connection on the back of the fuse/relay box (924S).

[Mr. Squid]

Glad it worked out for you.

Happy Motoring!