My Sunfire is having a problem with accelerating. Started yesterday
with no power climbing a hill. More I would push down on the gas, the
slower I would go. As I left off the gas it would smooth out, then
when I would push down it would die down. after making it to the top
of the hill, it would smoth out. Made it home with no issues. But did
notice if i would push down on the gas, it was dieing out. As long as
I pushed down slow on the gas it was ok. When I got home, I put it in
park. Next I stomped on the gas, and it would pop and miss. Today I
changed the inline gas filter and the plugs. Also changed the Oxygen
sensor. This car has 136,000 miles on it. I have been reading my
service manual for this car. Could it be the EGR valve or the Throttle
position Sensor.I'm guessing! Could someone help?
After changing the plugs, their was no change. I even layed the coil
pack to the side and ran plug wires to the plugs, and checked each
plug with a test light as I gave it gas. The spark was strong on each
plug. I even took out the Injector regulator and checked the screen.
That was clean. It seems that the fuel pump is fine. I had a lot of
pressure. Also started right up after checking it.
Having no codes, & attempting a guess, I'd have cat. convertor checked.
A stopped up exhaust can cause those exact symptoms. When it is a stopped
exhaust, you would hear a swooshing sound(as it exits tailpipe) while
accelerating & not gaining speed s
Don't think that would tell you anything. Muffler shops test the
convertors, sometimes by hand: bump on the COOL cat and if it rattles
inside, they know the insides are all to pieces and bad. Also, they check
difference in pressure going in relative to that going out, which can
determine whether it's good or bad. We generally out here in the field
don't have the tools to do this pressure-checking: we pretty much know from
'feel', and from the 'whooshing' sound under acceleration, and from
experience when one is bad. So we let the muff. shops verify and replace if
Al and All
I think we"re getting somewhere. I did notice it smells hot after
running awhile. So I took out the O2 sensor and started it up, Ran a
little better. So could I drop down the exhaust after the manifold,
and start it up. I have my ear protection ready! Will it breath better
to tell me that's the problem?
If the converter is plugged and you drop the pipe the engine will wake up
instantly. If you find it is the converter, don't forget the muffler will
sometimes get plugged with media from the converter. If you're doing it
yourself, disconnect the converter where the hot exhaust won't burn
something nearby. It gets very hot very quick.
When you had the O2 sensor out, was the exhaust coming out of the hole with
a lot of force or pressure? If the converter is plugged it will.
normally an exhaust shop will drill a small hole in front of conv., put a
pres. guage against it, and have someone gun the engine while checking
for back pres.......,then he will (oops, or she) weld over small hole in
about 20 seconds............free, everywhere ive ever been..........be
careful running eng. with exh. unbolted at flange. as stated, gets real
hot real quick!..............kjun
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Great Speed, Great Retention
THANK YOU EVERONE! The Cat was plugged! The front area was broke
up, jammed against the back screen. Put a new cat on. "WOW" what power
now! I hope other people reads this. I think this was plugged for a
while. Cost $80 to replace!
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