How to rid of this super raspy ear piercing noise at cold start up

[Steve8989]

Ford likes to run negative ignition timing when cold to get the cats up to temp faster, once the cats are up to temp around 770 degrees the idle will go down and the intake and exhaust will quite down. When the car is warm the Ford programing does not go into negative ignition timing when you start it so it will be quieter when you start it.

While you have removed the cats in yours I think the cold start automatically does the negative ignition timing for about a minute or so no mater what.

Ya when its been started any start up after is night and day quieter. Still loud but not chainsawing metal loud. So is there any cure for it?

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[Steve8989]

My car was actually louder than that. Long Tubes, no cats, MBRP mid pipe, MBRP race cat back. Horrible! Blew my garage pictures of the walls at cold start up.

Left the long tubes, no cats, stock resonator and stock cat back. Happy!
Gave away the MBRP crap.

Car still made 770HP at the wheels with the stock resonator and cat back. Exhaust gains are in the headers and cat area. After that, just noise which I couldn't take any longer.

So there is no cure minus taking off some of the exhaust back to stock?

 

[Steve8989]

Lose the ataks they sound about as shitty as a full straightpipe imo. Why would you want a raspy trumpet for an exhaust? Go pick up a nice 3in thermal r&d catback and you will have 0 drone, 0 rasp and a very deep aggressive sounding exhaust. I can get some clips if you want

Yes please

 

[Steve8989]

Op are you tuned? By who?

Ortiz performance

 

[mejohn50]

So is there any cure for it?

The tune can be adjusted to turn off the CSER timing reduction on cold starts which helps a ton, but since it’s part of an emissions control system I wouldn’t count on any tuners to do it. Maybe someone will, but that wouldn’t be my expectation right now.

 

[jpjr501]

So there is no cure minus taking off some of the exhaust back to stock?

The cure for me was putting the stock resonator and cat back on the car. I have zero rasp and it sounds so much better.

if you want to hear it:

 

[mejohn50]

The cure for me was putting the stock resonator and cat back on the car. I have zero rasp and it sounds so much better.

if you want to hear it:

I’d be asking to have that fixed because that’s no good. The RPM is all over the place and it sounds like it’s going to die several times. Ethanol cold starts can be tuned to be the same as pump gas. Ford has literally told us how much cranking fuel these engines need on E85, yet tuners still get it wrong.

 

[Blackedoutdreams]

Ortiz performance

It can be tuned out if you're catless. Have to ask the tuner for it be done. I did with mine.

 

[Pistol_91]

The cure for me was putting the stock resonator and cat back on the car. I have zero rasp and it sounds so much better.

if you want to hear it:

How come it's about to stall? Is there something wrong?

 

[jpjr501]

I’d be asking to have that fixed because that’s no good. The RPM is all over the place and it sounds like it’s going to die several times. Ethanol cold starts can be tuned to be the same as pump gas. Ford has literally told us how much cranking fuel these engines need on E85, yet tuners still get it wrong.

The blip in the beginning? E85 absorbs moisture and where I live it’s 80-100% humidity. Water pisses from my mufflers. It just has to get through that and it’s normal.

This is how much water E85 absorbs.

 

[jpjr501]

How come it's about to stall? Is there something wrong?

It’s never about to stall the cold start rpm’s are 1300, it’ll come down 1000 to get through some E85 moisture then it’s fine.

I just posted a video of how much water E85 can collect in high humidity areas. Water literally pissing from my mufflers.

In the winter time, low humidity on E85 and it’s perfect.

 

[Pistol_91]

The blip in the beginning? E85 absorbs moisture and where I live it’s 80-100% humidity. Water pisses from my mufflers. It just has to get through that and it’s normal.

This is how much water E85 absorbs.

How long do you let it sit there without starting it with e85? I live in FL too and never experienced this yet.

 

[mejohn50]

The blip in the beginning? E85 absorbs moisture and where I live it’s 80-100% humidity. Water pisses from my mufflers. It just has to get through that and it’s normal.

This is how much water E85 absorbs.

If you had a bone stock F-150 and it cold started like that (in Florida?) on ethanol, would you think that’s fine?

Ford has to calibrate the flex fuel vehicles to cold start on ethanol in all conditions. That means northern Sweden in the winter and Death Valley in the summer. I bet a shiny nickel they cold start in northern Sweden on full E85 just the same as they’ll “cold” start in Florida on pump gas.

I wouldn’t pay for that cold start, in Florida no less, no matter what the internet or a tuner tells me.

 

[jpjr501]

How long do you let it sit there without starting it with e85? I live in FL too and never experienced this yet.

It’s not a daily. I did 900 miles in 2024. This year about 300 so far. I try to start it once per week.

I’m not the original poster of this thread.

 

[Pistol_91]

It’s not a daily. I did 900 miles in 2024. This year about 300 so far. I try to start it once per week.

I’m not the original poster of this thread.

Got cha makes sense.

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