I have found that most modern gasoline vehicles ping during moderate
acceleration, especially in summer. I think it has something to do with the
summer fuel. My '93 with the 3.8 does it and my '95 with the 4.6 does too.
Is it severe or just light during acceleration? Oh, they used to call it
"the ping of economy".
Check to see if its overheating...Does it have a temp gauge? How long since
your last tune up? If its been 25K or more it would be a very good idea to
throw some plugs in it. Does it miss/vibrate at all?
I have a question (maybe a dumb one). On my newsreader I show a half an
hour between the time that you asked how to clean the MAF and the time
you said you had done it. Cleaning the MAF did magic for my T-Bird but
I had to buy a special non-tamper tool (auto parts store) and some
special cleaning fluid with a brush attached (radio shack). Then it
only took me about 15 minutes but that didn't include studying the
instructions and pictures. Are you sure you did it correctly?
Unplug the sensor, fire it up, it will go into "limp in mode" and if the
sensor is bad the car will actually run better. If you unplugged the sensor
while it was running it might die but it will start back up. The computer
will see the sensor isnt working and set a value to it so it will run...
p.s. never plug a sensor IN while the key is on, it could damage the
Why do you think that? For most cars I know, unplugging the
MAF causes them to drop back into a mode similar to the
older speed density systems that didn't use a MAF. I know
for certain (all?) GM cars this was part of the MAF
diagnostic procedure. If you unplugged the MAF and the car
ran better, then the MAF was bad. The PCm includes enough
programming to be able to run the car with certain sensors
malfunctioning. The PCM can figure out how much fuel to
inject based on the throttle position, the manifold pressure
and the engine rpm. It can then refine this based on the O2
sensor output. The MAF just provides one more input that
allows for better response and a much better initial
"guess." If the MAF is bad, it can confuse the PCM causing
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