Car stumbles on boost from 3800-4200.... but not all the time. Sometimes it runs perfect. No codes and the ign timing is at 10deg with the jumper... Any ideas?
Stumbles on boost
- Thread starter gixxer750
- Start date
Adjuster
Supramania Contributor
Bad fuel?
Just a guess, but add some toulene and see if that changes your tank of gas, and this "sometimes" problem.
PS, you can get the toulene at most paint supply stores, but it's going to cost you a few bucks thanks to the greedy oil companies and our friends the Saudi's.
Just a guess, but add some toulene and see if that changes your tank of gas, and this "sometimes" problem.
PS, you can get the toulene at most paint supply stores, but it's going to cost you a few bucks thanks to the greedy oil companies and our friends the Saudi's.
Adjuster said:
Yep...use a gal of Toulene or Xylene. It will raise 91 octane to about 94. This will correct a knock problem if your knock sensors is detecting knock and retarding timing on you.
Plug gap usually causes this problem...what psi boost you running?
could be a partieally clogged fuel filter. I had that problem and changed the fuel filter which btw is a pita and it went away.
hold on, you would mix a gallon of Toulene into a full tank of 91 and it will increase the octaine rating from 91 to about 94? is this safe for the plugs and O2 sensor?
edi said:
That is correct...been doing it for 4-5 tanks so far using Xylene, works good. BTW, Xylene is easier to get in the US than Toulene...the Meth heads use Toulene in their labs. That's why you read about them blowing up from time to time :nuts:
Take a look at this thread:
http://www.supramania.com/forums/showthread.php?t=17442
Well, the fuel filter is about 5 months old, I've got 93 octane in the car, running 12 psi on 8.4 compression. Its not a knock problem, as I can moniter knock and I'm not getting it.
jdub said:
WOW, i kinda heard of people doing this but wasnt to clear with it. i've got to try this but am still a little unsure of it. can anybody ells testify to this? this is verry interesting.
and, oh, sorry to change the subject. should i start a new thread on this?
jdub said:
Toluene's octane rating is 114. Adding a gallon to 15 gallons of 91 octane will increase it to 92.44 octane, not 94. If You use Xylene (is that 117 or 118?, I'll go with 117 to be safe) you will get an octane rating of 92.63. From what I've been told, low octane might burn out your engine.
Here's the Formula:
[(oct1*vol1) + (oct2*vol2)] / voltotal
fatality said:
It's actually 92.73 w/ Xylene...14 gal of 91 + 1 gal Xylene for a total volume of 15
Low octane will not burn up your motor, but it can cause detonation under high boost. That will do all kind of nasty things to your motor.