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Chevrolet Blazer Noises and Sounds

176 messages,  Last post on Nov 04, 2009 at 2:48 PM

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#147 of 176 Blazer noise under hood by py072888 Jun 14, 2009 (4:00 pm)
Own a 2000 chevy blazer. Makes a loud almost revving noise when its cold. noise will stop when you come to a stop and does not come back until the car is shut off. also when you stop it makes a clunking noise. any ideas. very similar to #107. almost the exact same thing. please help. Replies to this message: jlflemmons (Jun 14, 2009 10:38 pm) py072888 (Jun 15, 2009 8:16 am) jlflemmons (Jun 15, 2009 9:30 am)
#148 of 176 Re: Blazer noise under hood [py072888] by jlflemmons Jun 14, 2009 (10:38 pm)
Replying to: py072888 (Jun 14, 2009 4:00 pm) Very common for the fan clutch on a 4.3L to be very loud when first started and for the first few minutes. Not a concern unless the noise continues, indicating the fan clutch has locked up. This will kill your gas mileage, and also cause the engine to run cool. Replies to this message: py072888 (Jun 15, 2009 8:16 am) jlflemmons (Jun 15, 2009 9:30 am)
#149 of 176 Re: Blazer noise under hood [jlflemmons] by py072888 Jun 15, 2009 (8:16 am)
Replying to: jlflemmons (Jun 14, 2009 10:38 pm) No not like a fan clutch noise. Best way to describe is like the card in the bike tire. Only happens when the engine is cold. not even cool. I let the car sit for 3 hours and tried to make it happen and it wouldnt because it was still warm. Sounds like it is in the passenger side of the blazer. And the noise stops if you come to a stop sign and does not come back until next day or hours later. Im stumpped. Replies to this message: jlflemmons (Jun 15, 2009 9:30 am)
#150 of 176 Re: Blazer noise under hood [py072888] by jlflemmons Jun 15, 2009 (9:30 am)
Replying to: py072888 (Jun 15, 2009 8:16 am) Possibly then a problem in the blower motor area? Try changing the fan speed and see if the noise changes. ABS is on the other side, so not likely the ABS module cycling.
#151 of 176 noises and problems continued by py072888 Jun 15, 2009 (8:36 pm)
Ok i was reading your earlier posts and read something about a throttle cable. I noticed that my outer cable keeps popping off. This is my grandmothers car. When i say outer cable i mean one on passenger side of throttle control. i put it back on and pushed the clip in and it does not fall off anymore. I did this last night and she told me that when she started the car to go to work today it did not make the noise. i do not see how that clip not being on the cable could affect anything. This noise is pretty loud. sounds like an airplane propeller under the hood. i am going to rule out the blower as it does it whether the blower is on or off. I also realized that when i said it sounds like it is coming from passenger side i was sitting in the drivers seat so it could be middle of engine over. I am pretty handy with cars and have heard all kinds of noises but this one has me. car does not seem to run diffrently. but i want to fix it before it gets worse.   And now for another problem. Grandfather has a 94 GMC Sonoma. 4.3L vortec. We rebuilt the motor about a year and a half ago. it had spun a bearing and we bought it that way. Replaced the crank and had rods cut and new bearings all around. New knock sensor. Lately he noticed that at low RPM's the motor shakes pretty rough. plug on knock sensor was broke so i replaced it. same problem. this motor has a balance shaft in it and i fear it is something to do with that. any ideas are greatly appreciated. if more info is needed please let me know. once highway speed is reached shake goes away as long as you are on throttle. if pedal is in only a little shake is at its worst. i believe timing is good. 12 degrees one way or the other i dont remember. will check it again tomorrow. is my timing off? what should it be? truck still has plenty of power. blows smoke and smells real rich. please help. Replies to this message: jlflemmons (Jun 16, 2009 3:41 pm) blazer6973547 (Sep 11, 2009 3:31 am)
#152 of 176 Re: noises and problems continued [py072888] by jlflemmons Jun 16, 2009 (3:41 pm)
Replying to: py072888 (Jun 15, 2009 8:36 pm) Sounds more like an ignition or fuel problem than a balance shaft. Possibly a leaking fuel regulator or bad fuel spider assembly, hence the rough operation and smoking.
#153 of 176 irritating noise by larishere Jun 30, 2009 (9:05 pm)
I hear what sounds like a metallic rattling that seems to be coming from under the driver's side of my 2000 blazer. While on ramps I've shaken every possible thing I can find to grab hold of and can't find anything loose. A muffler shop told me that the inside of the catalytic converter is probably worn out and causing the noise. Could this be so and can it just be cut out or would running without the catalytic converter cause the engine to not run correctly. Replies to this message: jlflemmons (Jul 04, 2009 2:14 pm) blazer6973547 (Sep 11, 2009 3:36 am) richk28 (Aug 08, 2009 5:45 am)
#154 of 176 Re: irritating noise [larishere] by jlflemmons Jul 04, 2009 (2:14 pm)
Replying to: larishere (Jun 30, 2009 9:05 pm) Running without the converter could cause issues as this vehicle has a "closed loop" system for controlling the fuel injection. If the converter has come apart inside, it will sound something like marbles inside a coffee can.   A good source for used parts, converters included, is an eBay store named "s10warehouse".   I am in no way affiliated with these guys, other than having bought a LOT of used parts from them with very, very good service. Replies to this message: blazer6973547 (Sep 11, 2009 3:36 am)
#155 of 176 2001 blazer by blazeone Jul 15, 2009 (3:20 am)
just bought a new blazer and about 2 weeks ago it started squeaking sounded like the belt was loose so i replaced the tension pulley and the idler pulley started it up and no sound 1 day later the noise started again now it does it when i start it up but after a few minutes it stops when im sitting but start back up when i hit the gas and the more i push the gas it gets louder and dies down when i slowing down. any help would be great thank you Replies to this message: jlflemmons (Jul 15, 2009 5:54 am) steve_ (Jul 15, 2009 4:40 pm) blazer6973547 (Sep 11, 2009 3:41 am)
#156 of 176 Re: 2001 blazer [blazeone] by jlflemmons Jul 15, 2009 (5:54 am)
Replying to: blazeone (Jul 15, 2009 3:20 am) Not dissing Gates, but their belt for this application is not good. When you can get it to squeal, try spraying a little silicone or belt dressing on the itensioner pully and see if the noise stops, even briefly. If it does, find a parts house that sells the Goodyear Gatorback belt and install it. See if the noise goes away. I fought this on a '99 model for two months before learning about this issue. Has something to do with the way the Gates cannot shed dirt/debris from the grooves in the belt, but the Goodyear has crosshatching in the grooves to help clear them.   Haven't heard a peep in two years since changing the belt. Replies to this message: steve_ (Jul 15, 2009 4:40 pm)

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