Unusal Backfire/"Burbles"...........

[Golgo69]

Hey All,

About four weeks ago I broke out the BULLITT from cold storage, changing the oil and running the fuel (93 octane) that had been in it over the winter out. After going through a fuel tank, and refueling, I started experiencing a backfire or small burbul shifting up into 3rd and 4th.

This started happening after about 20 plus miles of driving, so the first 20 plus miles, there are no issues. Almost seems like after the car has been run for awhile, then this backfiring starts to happen.

The only thing that I've done to the car since the last two revisions I had on my tunes (93 octane and E85) was adding a bigger blowoff valve, which I did myself. I went from the stock one that comes with the pro charger to a bigger one (see pics).
Again, I'm currently on the 93 octane tune, and didn't want to switch over to E until I figured this out.

I did a data log yesterday and sent to Wengerd. I also pulled somes codes and here's what I got......
Oh and yesterday by coincidence, I got a "checkfuel fill inlet" message.....this is what made me pulled the codes. I did try and clean the fuel cap, using the extender tube. Not sure if that has done anything, as I didn't keep it out long enough afterwards.

any thoughts....?

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[junits15]

I thought bulitts had the burbles enabled from factory? Or is this different?

 

[Golgo69]

I thought bulitts had the burbles enabled from factory? Or is this different?

different. backfire/burble

 

[Beaujangles]

I have an ESS kit on my Bullitt with a Wengard 93 octane tune and it did change the "rice crispy" sounds from the factory tune, it still farts and pops, just not as much...it's all good.

 

[Golgo69]

it just started recently. was fine all last year. strange.....

 

[Paddles]

it just started recently. was fine all last year. strange.....

Do you still have cats?
I'm no expert but I believe a burned up cat would likely change the burbles

 

[Golgo69]

Hi flow cats

 

[NGOT8R]

I PM’d you.

 

[Golgo69]

Update(which is not good)

Since I have last posted, I have been told that my issue could be related to fuel injectors or the tune. Have pretty much been told it's not the tune based on a data log and tune revision (which did not solve the issue).

One thing that is strange, after it starts doing the backfiring (after about 40-60 miles), if you stop and turn the engine off, and restart immediately, it stops backing.

My mechanic had me do that, to point at it not being something mechanical, and more possibly tune related.

At this point I'm very frustrated and at a dead end. Any ideas.....please tell

 

[Paddles]

Update(which is not good)

Since I have last posted, I have been told that my issue could be related to fuel injectors or the tune. Have pretty much been told it's not the tune based on a data log and tune revision (which did not solve the issue).

One thing that is strange, after it starts doing the backfiring (after about 40-60 miles), if you stop and turn the engine off, and restart immediately, it stops backing.

My mechanic had me do that, to point at it not being something mechanical, and more possibly tune related.

At this point I'm very frustrated and at a dead end. Any ideas.....please tell

Maybe you can data log the before and after engine restart so the tuner can compare data from both conditions?

 

[Golgo69]

Maybe you can data log the before and after engine restart so the tuner can compare data from both conditions?

That’s a good idea. I’ll do that. Thanks for the reply

 

[Mach VII]

Who's your tuner?

 

[Golgo69]

Who's your tuner?

Wengerd

 

[Golgo69]

I did a bottle of Seaform about two weeks ago, while I was still on the 93-octane tune. Ran the tank down to about 60 miles to empty (which is about as low as I take it) and then switched tune to E85. Have been on that about three tanks now. Have not experienced the bur burl or backfiring since then. Have no idea if the seaform did the trick or switching to the E85 tune. So confusing.....

 

[LOL WUT]

I did a bottle of Seaform about two weeks ago, while I was still on the 93-octane tune. Ran the tank down to about 60 miles to empty (which is about as low as I take it) and then switched tune to E85. Have been on that about three tanks now. Have not experienced the bur burl or backfiring since then. Have no idea if the seaform did the trick or switching to the E85 tune. So confusing.....

In the short amount of time my car was on 93, the exhaust note and burbles were far more aggressive. On E85 I get 0 burble or “backfires” between shifts or on decel. My assumption is that switching to E85 is what changed things for your car.

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