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You change your ratio and then revs per mile based on your tire size. https://www.miata.net/garage/tirecalc.html Then you should be dead on.

Check the coil plugs. I had a miss I chased for some time until the plug finally fell apart internally giving me a hard fail. I bet I looked at it 5 times then it came apart in my hand.

That little box mentioned a few posts back is a filter to protect the valve. May as well check the vent valve while your there that it still works. (Open with power off) Take it out and blow it out good. My 05 had all kinds of crap in it and even though it seemed to flow good it didn't. Once I...

Not sure how to fix the post but here is the doc

The Stepper was changed before and I did change it again thinking that myself. But no fix this time. The speedo is smooth and follows well, it just starts in the wrong place now and then. But then it will fix itself on a shutdown and sometimes not till another shutdown. Makes it hard to...

I do need to verify that the feed is unstable. Then that would clinch the sensor as the problem. I will do that when I get a chance. But still if it is bad I need to get the p/n.

Problem: Speedo intermittently reads high (10-20mph) but then after a shutdown may return to normal. Generally on start, it will be at zero mph and follow speed as normal. But at times on start it may be at 10mph parked and follow 10 over and back consistently with speed increase and slowdown. I...

Agree. I want know to myself and see if I can mod a quicksilver.

Blower Motor Resistor is the easy cheap shotgun barrel. Under 20 bucks under the right console. After that get out the meter and run wires and check your switch. You will do that from the resistor anyway.

It is more of a personal preference IMO. I like autos but I like the option of manually shifting it too. Ratchet shifters offer more control over that then stock does. But you got to admit in traffic and stop and go an auto is more user friendly. Take it from a guy with knees that are old and...

My favorite has always been the B&M Quicksilver Ratchet shifter. Pull Pull Pull Push Push Push. Funny though the pictures on B&Ms site show the shift pattern as P-R-N-D-3-2-1. Since OD is electric defeat controlled I wonder if the QS could be adapted? Would depend on the lever positions for each...

I wish there was a replacement shifter for the 5R55S other than the overpriced TCI. Why didnt B&M ever design a starshifter for this I dont know. Good luck on the engineering project.

Start here and learn the system. http://www.obdii.com/obdii.html

AMSOIL Fan here. You will need to add the modifier too that is $7.00 more. Weight is really a choice for you. The recommended is for fuel economy to help meet those retarded CAFE standards. Thats up to you.

High oil temp is not specifically the issue. The code says temp it is not within predicted range the PCM expects. More specifically it isnt warm enough. You need to check the engine temp vs oil temp with a scanner. Questions: Is the car slow to warm up? If so Stuck Thermostat may be the cause...

Beautiful car!!

Im running the Conti now and really like them. I am really impressed with the snow and ice traction with them since where I am that is very important. The traction in dry conditions is really nice too. My only suggestion is that they add a belt or two to the sidewall to stiffen up the cornering...

The stall speeds are from 307-01-3 Ford Mustang tech manual. As for the OD disabled it just makes the clutch disengage / engage easier to see. I think the OP is asking if the lockup clutch can be controlled by a Tune to engage at a specific RPM. At least that is the impression I got from the post.

I know of no way to do it with a tuner. Perhaps someone that writes tunes could answer that. The PCM controls when it engages but what it uses to make the decision I cant say. My guess is it is some sort of load logic in the PCM. As far as testing the clutch you disable OD and drive steady...

It is the air box blend door drive motors. There are 3 of them and mine did the same thing. Poor design but has since been improved. (Teeth get chipped internally) The fun part is figuring out which is bad. Two are easy changes One is a Biatch! Run through your switch settings and you can...

That is what the tech manuals state for them. The values are with the Locking Clutch disabled during the testing. So those would be the true stall speeds. That would also be why there is a locking clutch in the TC controlled by the PCM.

Per Ford it is: 2,290-2,705 4.0L 2,556-3,014 4.6L

I find it a bit disturbing that such a serious and proven issue exists in the industry as a whole. And that it has taken so long to correct. Not a Ford only issue for sure. I Bleed Blue, and always will!!

Here is bad bit of info on the recall. I took mine in years ago and kept getting the notice after I supposedly had it done. Come to find out what they did the first time re-program the air bags to not deploy unless there was a harder crash. The second time in December 2017 I took it in again...

LEXOL Does Wonders BTW Only the centers you sit in are Leather. Sides and everything else (And the full back seat) are Pleather vinyl.