Lund tune on 15 mustang

[sysquella]

Hey I just installed Stainless power long tube headers and a gt350 intake manifold on my 15 mustang gt. I have a custom lund racing tune. Has anyone had any problems with the throttle? Cold start my rpm is super low like under 1k. And it stalls. Then while driving from dead stop the throttle is very laggy. Like kinda sluggish. This is my first tune on any car so I don't really know if this is normal. Any help would be nice thanks.

 

[Laztug]

Ouch! Did you have your tune optimized for your setup?
You may want to contact your vendor to see if something out of place.

My AED FF Idle lope GT350 IM/TB PMAS cai, arh 1 7/8 orx starts like a match the first time....every time.

 

[sysquella]

I have never bought a tuner before, but I did send my setup to lund racing and he sent me this tune.

 

[1quick]

Data log what the car is doing and send it to Lund through the support ticket system, someone will check it out and probably send you a revised tune

 

[Cyclerick]

This is why I like a local tuner. I had my car tuned on Wednesday. We did 8 runs and tweaked the tune 4 times to get it to 95% tuned. Then my tuner will review those logs and make final adjustments and we will make a few more runs to confirm it.

 

[sysquella]

I will data log it tomorrow and send it in. Thank's for the info guys.

 

[scotmach]

Are you using the stock throttle body or the GT350 one?

 

[sysquella]

using stock throttle body with MMR GT Throttle Body to GT350 Intake Adapter (15-17) 5.0

 

[Joseph Land]

You may have a vacuum leak at that adapter or on the manifold itself. Do the logs at low idle and start up and send them to Lund they can tell.

 

[sysquella]

Yesterday I was driving down freeway and I kept on hearing this kinda like a hissing sound/ whining sound inside the car coming from the passenger side. So I called my installer to ask him. Already sent some stuff to Lund waiting on a reply.

 

[Zodiac]

I'm having the exact same issue with my Lund tune and stalling out and low idle. It only happens after the first start up. So when I start it and run to the store it's fine. When I start the car again after coming out of the store it does the low idle stalling. When I start it in the morning to go to work it's fine, and when I get done with work it's fine.

I too have the GT350 IM, stock TB and MMR adapter.

Have you had any updates?

How would one datalog the startup/stalling issues?

 

[whatsup62]

Check for vacuum leaks!! Sounds like you both have them.

 

[Venumous]

No issues when on the same setup as you, self installed, with Lund tune. I think my car was perfect after the first datalog revision. I went Flex Fuel option too as I have E85 close by.

I agree your issue sounds like a Vac leak.

 

[HISSMAN]

I'm voting vac leak as well. Obvious vacuum leak is obvious.

 

[Zodiac]

It would be easy to assume a vac leak but it doesn't do it every startup. Hell after I installed I broke one of the bolts and had a shop remove the IM and back out the broken bolt, and still have the issue.

Any suggestions to check?

Sorry OP to hijack your thread.

 

[Venumous]

Yours sounds more like a fueling issue in the tune to me Vs. the OP.

 

[Zemedici]

Get a dyno tune

 

[Zodiac]

As an update got mine fixed, I talked to OP I think he said he gots his fixed as well. Lund sent me a tune for the GT350 throttle body. Finally after datalogs and back and forth I'm good.