Coyote Tune and Stalling Issue

[Slider]

Hi all, a few weeks ago I'd mentioned that I had a local tuner work on setting up my Coyote and that he had told me that he would be able to resolve the stalling issue without the need for the Speed Sensor. At first I was very thrilled with the work he did, but over the past few weeks of driving, I have found that I still have the stall issue from time to time, and the engine seems to be running a little bit rich (some backfiring occurring under deceleration). Now, I'm having trouble getting the guy to respond to my requests to tweak the tune, which could mean a few things (could be busy, or could not know what more to do to fix it). Regardless, the engine isn't running as it should, even though it is a blast to drive as it is. I'm actually wondering if others of you have been able to fully resolve the stall issue without the speed dial, and if so, who you've used to tune it. I've got the Diablo tuner, so would just need someone (if my guy doesn't respond) to create a new tune. This time around I'd really like to find someone recommended by you guys who have the same set up as I do... My local tune was recommended, and he said he could do what we needed, but it isn't appearing that is the case. I look forward to hearing back.

[bansheekev]

JMS Chips (jmschips.com) seem to be the defacto go-to guys for Coyote swaps. Unfortnately I think they standardize on SCT tuners though. You call them up and tell them about your setup (intake and exhaust) and they will create a tune specifically for your configuration on the Coyote / Controls Pack. No backfiring, stalling, or rich smells (without the speed dial to boot). They are referenced all over the Modular Ford forums and here with Cobra installs too.

Kevin

[FFinisher]

I know you said without the speed dial. I am curious though, why not just install it and be done with it?
I had a car that was back firing like crazy and stalling. I put the speed dial in it and it runs like a champ now.

I highly recommend it, and without 20 trips to a tuner.


Not trying to be a spoiler, but the speed dial works...

[JL1958]

I don't know anything about the Coyote set up, but mine was backfiring, smelled as if it was running rich and was just generally bucking and jumping.
I have a 302 / efi. The guy tuned it, but said if I did not swap my distributor it would start up again. They had a garage full of high performance mustangs with 302 and coyote engines and seemed to know their stuff.

[bansheekev]

Probably a tradeoff between 20-40 HP gain with the tune vs. no tune and the speed dial to reach the same end to eliminate the problems. A lot of people would probably never know the difference. I think both paths are viable. More time and wiring or a little more money above the cost of the speed dial for a tuner and a tune and no more wiring plus some more HP.
Kevin



I know you said without the speed dial. I am curious though, why not just install it and be done with it?
I had a car that was back firing like crazy and stalling. I put the speed dial in it and it runs like a champ now.

I highly recommend it, and without 20 trips to a tuner.


Not trying to be a spoiler, but the speed dial works...

[Slider]

Thanks for the thoughts on this. I'm hoping I can get to my tuner and have him resolve this, but it is looking like a lost cause... My preference to not use the speed dial is 2 fold. First, it seems to me that with such a computerized engine, it should be possible to resolve programmatically, therefore eliminating the need to try and fool the engine with more wires being plugged in. Second, and maybe more practically, I installed the box that I need to access for the speed dial behind the dash, which means I have to pull the dash to add the speed dial at this point. Not a huge issue, but one I'd rather not deal with if there is another way...

I'll call the JMS guys tomorrow and see if there are options where they can use the Diablo tool...

Thanks again all!

[bansheekev]

I'm kind of in the same boat... I have a heater, glove box, and the Coyote power distribution box behind the dash. I'm pretty much out of space. It is crammed tight back there. I suppose I can find somewhere else to put it like above the passenger side foot box in the engine bay but more wiring is not high on my list. I've been planning the JMS tune all along so if I decide to mod it down the road more (supercharging maybe? I had a blown modular in my Saleen I sold to start this project) I would have the SCT tuner already.

Kevin


Thanks for the thoughts on this. I'm hoping I can get to my tuner and have him resolve this, but it is looking like a lost cause... My preference to not use the speed dial is 2 fold. First, it seems to me that with such a computerized engine, it should be possible to resolve programmatically, therefore eliminating the need to try and fool the engine with more wires being plugged in. Second, and maybe more practically, I installed the box that I need to access for the speed dial behind the dash, which means I have to pull the dash to add the speed dial at this point. Not a huge issue, but one I'd rather not deal with if there is another way...

I'll call the JMS guys tomorrow and see if there are options where they can use the Diablo tool...

Thanks again all!

[oldguy668]

The speed dial thingamajig only addresses the stalling issue. Using an SCT tuner and tune file also addresses the rich running issue as well as the stalling problem. JMS is the retail arm of SCT, so they have all the latest stuff.

[tcoon]

I am running both speed dial and JMS power tune and have had zero drivability problems. On the dyno the a/f ratio is dead on. Only detectable issue is very slight hesitation in first 1-2 minutes of running when you first drive out of the garage on a cold morning. Very tolerable! I believe this is the best combination.

[Jay Mann]

I installed the speed dial and the JMS Max Power tune. I found that the engine idled at 2000 rpm then 1500 for a while before dropping to 1000 when at a light. The engine stumbled on acceleration, it was not pleaseant to drive in general. I disconnected the Speed dial and the drivability is now very good. It does stall every once in a while while coasting afer running at highway speeds , but not often enough to be a problem.