Car Ran Terrible Tonight :(

[Khyber]

Do you run 87 in yours?

87 only, just like :ford: says you can in the manual.... until I get a tune.

and 87 only is a ~1% HP difference. we've covered this in 200 threads in this forum

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[Red Turtle]

87 only, just like :ford: says you can in the manual.... until I get a tune.

and 87 only is a ~1% HP difference. we've covered this in 200 threads in this forum

Regardless of what the internet or this forum says, I still can't understand the idea of running the worst possible fuel in a performance car for the cost savings of $5/per tank.

There is a lot more than peak HP numbers that can change the overall feel of the car when running lower octane.

OP, I hope you get it figured out.

 

[50hhh]

Regardless of what the internet or this forum says, I still can't understand the idea of running the worst possible fuel in a performance car for the cost savings of $5/per tank.

There is a lot more than peak HP numbers that can change the overall feel of the car when running lower octane.

OP, I hope you get it figured out.

I agree. Hell all the german and Japanese performance cars require 91 or 93 minimum...

 

[Khyber]

Regardless of what the internet or this forum says, I still can't understand the idea of running the worst possible fuel in a performance car for the cost savings of $5/per tank.

because I can't understand why run anything higher. makes no difference at 45mph. there is nothing "bad" about 87. 93 is not magic fuel

also because regular is $1.79

but you insinuating that 87 is the root of any problem is ludicrous.

 

[NotBlake]

Were you running AC? I have noticed that unlike many modern cars the mustang does not cut off the AC compressor under full throttle. Don't know why, but that definitely will make it feel sluggish.

 

[Red Turtle]

because I can't understand why run anything higher. makes no difference at 45mph. there is nothing "bad" about 87. 93 is not magic fuel

also because regular is $1.79

but you insinuating that 87 is the root of any problem is ludicrous.

You are right, a poor performing car (according to the OP) that was running 87 octane with no codes ..... is ludicrous to include fuel as a possible issue.

You obviously have never had a bad batch of gas in a stock tuned coyote. When my previous 12' GT was stock tuned, I had a bad tank of fuel that caused the car to ping and run significantly sluggish. The ECU is designed to protect the engine and will adjust parameters depending on the fuel. If it senses knock, it will make all necessary changes to ensure safe operation.

Let's just agree to disagree and hope the OP's car is fine.

 

[foghat]

You are right, a poor performing car (according to the OP) that was running 87 octane with no codes ..... is ludicrous to include fuel as a possible issue.

You obviously have never had a bad batch of gas in a stock tuned coyote. When my previous 12' GT was stock tuned, I had a bad tank of fuel that caused the car to ping and run significantly sluggish. The ECU is designed to protect the engine and will adjust parameters depending on the fuel. If it senses knock, it will make all necessary changes to ensure safe operation.

Let's just agree to disagree and hope the OP's car is fine.

The second post in this thread is Khyber suggesting bad gas might be the issue...

Suggesting it might be because of a bad batch of fuel is one thing. Stating as you did in your first post: "and issue most likely relates to running 87 in the car.", is quite another. That is all that is being said.

 

[Khyber]

The second post in this thread is Khyber suggesting bad gas might be the issue...

Suggesting it might be because of a bad batch of fuel is one thing. Stating as you did in your first post: "and issue most likely relates to running 87 in the car.", is quite another. That is all that is being said.

Thank you lol

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[50hhh]

Unplugged ECU overnight with a full tank of 91....Car seems to be running much better. No clue what the issue was. Checked intake it was clear.

 

[Asharus]

ive run one tank of 87 so far in 13k miles. didnt feel a difference. only reason was cuz i pulled up to a pump that had only 87 and to use another pump if i wanted another grade. was too lazy to move and said fuck it, LOL.

i was thinking about it the other day if i should just keep putting in 87, since i fill up quite often with my 2k miles a month commute.

 

[Asharus]

Unplugged ECU overnight with a full tank of 91....Car seems to be running much better. No clue what the issue was. Checked intake it was clear.

maybe u had a tank of bad gas and the ECU pulled timing, it was probably just taking some time to relearn the advanced timing if you put good gas in recently.

 

[skeeter]

It splits my wig you guys buy a 5.0 and run less than 93.

 

[Ecoboosted]

It splits my wig you guys buy a 5.0 and run less than 93.

You have a wig! :eyebulge: JK. I wish i could even get 93 where i live. Best i can get is 91 w/o ethanol. Although if i ever get a tune i can get E30 but by the time that happens i will most likely moved out of the area.

 

[50hhh]

It splits my wig you guys buy a 5.0 and run less than 93.

I typically run 91 or 93. I do put 87 in sometimes when they don't have 91 or 93 available.

 

[H6G]

Unplugged ECU overnight with a full tank of 91....Car seems to be running much better. No clue what the issue was. Checked intake it was clear.

This kind of reminds me when I had my Camaro SS (LS3). Someone had posted on their forum about a simple procedure. It basically stated that these cars originally came with 87 Octane. Due low Octane, the ECU were calibrated to that low rating (from assembly line). Subsequently, even after going to a higher Octane... It would not make any difference as far as performance goes.

So the procedure was simply to pull 2 ECU fuses for at least several hours (overnight). That made a huge difference as far as how much better the engine responded. And I'm not talking about the 'placebo effect'. It somehow 'recalibrated' the ECU to a higher Octane. Now, I'm not saying that the same thing would apply in your case... Who knows.... Maybe it could have been.

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