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2003 MOTE CARLO LACKS POWER WONT GO PASS 20 MPH
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broncos29
Novice
Sep 12, 2009, 12:22 PM
Post #1 of 5
(3137 views)
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2003 MOTE CARLO LACKS POWER WONT GO PASS 20 MPH
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03 CHEVY MONTE CARLO 3.4 LITER / STARTED MAKING A WHISTLING SOUND GOT LOUDER WOULD ONLY EXCEED 20 MILES THE WHISTLING SOUND IS BY THE BACK EXHAUST MANIFOLD WOULD THE CATALIC CONVERTER MAKE THE CAR WHISTLE WHAT RPM ? WOULD THE GOVERNER KICK IN BECAUSE WHEN THE NEEDLE HITS 4000 RPM IT FEELS LIKE THE GOVERNER KICKS IN
(This post was edited by broncos29 on Sep 12, 2009, 1:34 PM)
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Sidom
Veteran
/ Moderator
Sep 12, 2009, 1:08 PM
Post #2 of 5
(3134 views)
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Re: 2003 MOTE CARLO LACKS POWER WONT GO PASS 20 MPH
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Ok.....
A bit more info would be helpful. Engine size??? Check engine light on & the code?? Fuel pressue? Any work or maintance that has been done??? etc....
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Sidom
Veteran
/ Moderator
Sep 12, 2009, 10:01 PM
Post #3 of 5
(3119 views)
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Re: 2003 MOTE CARLO LACKS POWER WONT GO PASS 20 MPH
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Best thing to do when you are adding important info is to add a reply and not edit, this way the thread gets a "new flag" on it & someone will jump in. If you like me, always fixing my posts so I don't sound like the okie that I am, then edit is the way to go, no flags just fixes. I'll delete your other thread & we'll keep everything on this one for this particular problem...
With the info you provided I would be checking the exhaust for a restriction. Get a vacuum gauge & compare idle & high rpm vacuum, if the high rpm is way low, you are probably looking at a plugged cat. If you have a backpressure gauge, you can check backpressure to make sure it's under 2lbs. One way to confirm the problem would be to take out the frt O2 sensor or loosen the cat at the manifold and see if that makes it run better.....
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broncos29
Novice
Sep 13, 2009, 7:22 PM
Post #4 of 5
(3105 views)
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Re: 2003 MOTE CARLO LACKS POWER WONT GO PASS 20 MPH
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DID THAT I TOOK DISCONNECTED CAT I DONT HERE IT WHISTLE BUT IT STILL BOGS DOWN @4000 RPM
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Sidom
Veteran
/ Moderator
Sep 13, 2009, 9:31 PM
Post #5 of 5
(3098 views)
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Re: 2003 MOTE CARLO LACKS POWER WONT GO PASS 20 MPH
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If you are reving it up in park/neutral the rev limiter kicks in around there.
This is where you need to take vacuum & backpressure readings before & after, that will tell you if disconnecting the cat has actually made a difference or if there is even a problem in the exhaust.
If you can secure the cat a quick drive will tell if you can get it over 20mph & that is has it's power back... i wouldn't go to far just due to the noise
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