| Author |
Message |
Alpha One
Guest
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 Posted:
Fri Dec 09, 2005 9:15 am Post subject:
94 Buick LeSabre problem |
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My 94 LeSabre sometimes vibrates or shakes when going on the road. It does
it mostly when I am cruising at about 50 mph. It's something like an
hesitation but somewhat rhythmic. If I lift the foot from the gas pedal or
press it until the car shifts down that vibration or hesitation stops. It
also does it at lower speeds. It's not the CV joints or the computer. I took
it to a transmission place and they said it must be the engine, maybe a bad
spark plug, wire, etc. I replaced these and also switched the Ignition Units
and Coils with the ones from another Buick I have and it didn't fix the
problem. When I read the codes one tells me that cylinder # 5 and #6
misfire, #5 almost all the time. But when I check the spark at the spark
plugs it is strong and doesn't appear to miss and the engine doesn't shake
or hesitate. When cold it does it more and I can notice a vibration at idle
as if one spark plug wasn't working well, but not as if a wire was
disconnected. Compression is almost even on all cylinders except number 1
that is lower about 12%. However, spark plug number 4 looked dirty as if it
wasn't burning well, but not that bad. Otherwise the car run OK and starts
at the first time. Vacuum and gas pressure are normal. Any idea what may be
causing this?
Thank you
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Mike Marlow
Guest
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| Posted:
Fri Dec 09, 2005 6:20 pm Post subject:
Re: 94 Buick LeSabre problem |
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"Alpha One" <alphaone@optonline.net> wrote in message
news:3pamf.5892$L7.4297@fe12.lga...
| Quote: | My 94 LeSabre sometimes vibrates or shakes when going on the road. It does
it mostly when I am cruising at about 50 mph. It's something like an
hesitation but somewhat rhythmic. If I lift the foot from the gas pedal or
press it until the car shifts down that vibration or hesitation stops. It
also does it at lower speeds. It's not the CV joints or the computer. I
took
it to a transmission place and they said it must be the engine, maybe a
bad
spark plug, wire, etc. I replaced these and also switched the Ignition
Units
and Coils with the ones from another Buick I have and it didn't fix the
problem. When I read the codes one tells me that cylinder # 5 and #6
misfire, #5 almost all the time. But when I check the spark at the spark
plugs it is strong and doesn't appear to miss and the engine doesn't shake
or hesitate. When cold it does it more and I can notice a vibration at
idle
as if one spark plug wasn't working well, but not as if a wire was
disconnected. Compression is almost even on all cylinders except number 1
that is lower about 12%. However, spark plug number 4 looked dirty as if
it
wasn't burning well, but not that bad. Otherwise the car run OK and starts
at the first time. Vacuum and gas pressure are normal. Any idea what may
be
causing this?
Thank you
|
Check the throttle position sensor. And... clean the throttle body. I'd
clean the throttle body first since that requires not parts purchase. The
TPS on that motor is a bit of a pain to replace and to be done properly it
has to be calibrated when you replace it, but it's a fairly common failure
point. It's only a pain to replace because of where it's located. Requires
you to "get down under that part, and in between these two and behind that
one over there...".
--
-Mike-
mmarlowREMOVE@alltel.net |
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Alpha One
Guest
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| Posted:
Sat Dec 10, 2005 6:57 am Post subject:
Re: 94 Buick LeSabre problem |
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I replaced the throttle position sensor and adjusted it recently and cleaned
the throtle body. Could it be because of carbon build up in the cylinders?
"Mike Marlow" <mmarlowREMOVE@alltel.net> wrote in message
news:c27ea$4399768a$4528974d$324@ALLTEL.NET...
| Quote: |
"Alpha One" <alphaone@optonline.net> wrote in message
news:3pamf.5892$L7.4297@fe12.lga...
My 94 LeSabre sometimes vibrates or shakes when going on the road. It
does
it mostly when I am cruising at about 50 mph. It's something like an
hesitation but somewhat rhythmic. If I lift the foot from the gas pedal
or
press it until the car shifts down that vibration or hesitation stops. It
also does it at lower speeds. It's not the CV joints or the computer. I
took
it to a transmission place and they said it must be the engine, maybe a
bad
spark plug, wire, etc. I replaced these and also switched the Ignition
Units
and Coils with the ones from another Buick I have and it didn't fix the
problem. When I read the codes one tells me that cylinder # 5 and #6
misfire, #5 almost all the time. But when I check the spark at the spark
plugs it is strong and doesn't appear to miss and the engine doesn't
shake
or hesitate. When cold it does it more and I can notice a vibration at
idle
as if one spark plug wasn't working well, but not as if a wire was
disconnected. Compression is almost even on all cylinders except number 1
that is lower about 12%. However, spark plug number 4 looked dirty as if
it
wasn't burning well, but not that bad. Otherwise the car run OK and
starts
at the first time. Vacuum and gas pressure are normal. Any idea what may
be
causing this?
Thank you
Check the throttle position sensor. And... clean the throttle body. I'd
clean the throttle body first since that requires not parts purchase. The
TPS on that motor is a bit of a pain to replace and to be done properly it
has to be calibrated when you replace it, but it's a fairly common failure
point. It's only a pain to replace because of where it's located.
Requires
you to "get down under that part, and in between these two and behind that
one over there...".
--
-Mike-
mmarlowREMOVE@alltel.net
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Mike Marlow
Guest
|
| Posted:
Sat Dec 10, 2005 8:05 am Post subject:
Re: 94 Buick LeSabre problem |
|
|
"Alpha One" <alphaone@optonline.net> wrote in message
news:RJpmf.4376$Kf4.2794@fe08.lga...
| Quote: | I replaced the throttle position sensor and adjusted it recently and
cleaned
the throtle body. Could it be because of carbon build up in the cylinders?
|
I doubt that. These things burn really cleanly today. Just look how nice
your plugs look, even after 100,000 miles on them.
--
-Mike-
mmarlowREMOVE@alltel.net |
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