This is about a 1988 350 auto 4x4 2500 Suburban. After putting on headers
the damn light keeps coming on and when it does go on I can watch the gas
Just to tell you what I have done to try and stop this. I installed a sensor
that is preheated from a corvette and it didn't stop the problem.
If any of you have any ideas please share with me.
I will share with you that are having rotor problems with warping or rapid
wear, get you some cross drilled and slotted from www.hitectool.com as mine
work great. 142,000 miles now and I put them on at 11,000.
the heated sensor will help the ECU while running in closed
loop..........but installing the hedders forced the mixture over too the
lean side because of the increased scavenging.
the higher combustion chamber temperature may be causing some preignition
which the knock sensor is hearing and then the ECU turns the light on
because it's unable to compensate for the lean condition by going to full
rich mode while retarding the timing.
(holy crap, what a theory........huh)
i don't know brother, maybe you knocked a wire somewhere that's pissing off
you could try changing the PROM chip in favor of a performance version, this
would give you a fuel curve
that takes advantage of the increased scavenging offered by the hedders.
your guess is as good as mine friend.
"Chuck H." < email@example.com> wrote in message
How about no guesses and telling us what codes it is throwing?
"Ignorance is preferable to error; and he is less remote from the truth who
believes nothing, then he who believes what is a wrong."
- Thomas Jefferson
Formerly: KJ the Lonely Grease Monkey
This is the first time I read an answer to why my mpg. went down about
7% after I installed a Flowmaster muffler on my Blazer. Chevy wants
$360 for a new stock muffler and I figure it will take about 60,000
miles of driving before it pays for itself. ;-(
Are you sure that you're not driving a little more spirited with the louder
muffler then you were b4 u installed the flowmaster................maybe
gettin it a little mo cuz it
sounds so good.
come on now, tell the truth.
Most people don't realize the sound adds:
Weight to the foot, and decreases miles per gallon.
A free flowing system, actually increases mileage, due to the lower end
torque improvement, and the higher range horsepower. Due to the more even
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