Engine knock
 

I was wondering if any one has had any problems running 91 and getting spark nock? I have seen the threads of people with fuel pump and issues.

Thanks

Whenever I go South to California, for my first fill of 91, my engine runs rough as hell for about a half hour. That 1 point drop in octane is brutal until the ECU sorts itself out.

Is that what you're wondering?

I have run as low (in desperation) as 87 with no discernible knock. Running 91 would not harm your fuel pump or cause any other issues.

Yeah, ditto but boy howdy! Right? Painful to push the accelerator.

Few of the locals said they noticed it a few times. Would nock a little then run fine a while later. We only have 91 out hear unless you mix a little 100 in to make 93. I was wondering if maybe they got a bad tank most of them fill up at top places. If it's 109f out side that wouldn't be enough to have it nock would it? Or cause an injector problem ?

more to the lines if they got a bad tank of gas or if they had another problem that would cause that issue.

I always fill up with good gas and mix it to 93. So I haven't really noiticed any problems my self.

I understand that the stock tune is designed for 93 or 94 (just hearsay from people I've come to trust here) It actually looks for knock and then backs away from it. That's where you get the most *cough* bang for your buck. :D

So it could be just adjusting that time.

What about bad gas or is that just another thing of the past as well?

I can't really speak to that. Just never been surprised.

There is one thing that I notice regularly. During a period of steady highway driving I can predictably get tip-in knock by stabbing the throttle after engine braking(fuel cut). I've learned to just ease into the throttle to prevent it. I'm sure there's nothing wrong or special about my car. It's just normal.

:sign0012:

I know I know... :(

I'm not wrong, though. Am I?

I'm not here to spoon feed you.

;)

(here's a tip, open PDF, ctrl+f 'octane')

ROFL!!!

the stock car is made for 91. You'll be fine.