2000 Chevy Blazer LS 4wd 4.3L 2door 130k aprox miles automatic trans
first problem that is most recent is it makes a humming/vibration (almost like when u drive over worn out rumble strips on road) when driving between 45 and 60+mph. Funny thing is it only does it when u DEcelerate. Drives smooth until u let off gas, then after a second or two it starts vibrating but quits as soon as u give it even just a quick tap on the gas pedal but will start back up again after a second or two if u dont continue the small trickle of gas. Most noticable at 50-60+mph. Quits completely once u decelerate below 40mph. Very faint hum between 40-45mph. Felt through front of truck and maybe part of middle(between front seats). Doesnt make a difference if u brake or not. Just quits sooner cuz u get to 40mph sooner :P
Truck also seems sluggish at times. Doesnt always happen (no pattern) but at the times it does happen it acts like it doesnt want to shift from first to second gear no matter how much u press on gas, rpms dont even move. And then after a second it lunges like it just got the blast of gas. Makes a gurglish sound so I know the truck wants to go. It just cant. Gurglish sounds faster the harder u press on gas but rpms dont move. After second gear its fine and has no problems. Doesnt seem to matter if truck has been sitting for a while or been running all day nor seems to be consistent w/ weather or temperater. Just does it whenever but only when truck should be shifting from 1st to 2nd. And since I cant recreat problem. I cant test to see if I can manually shift from 1st to 2nd to see if it still has problem. Doesnt happen too often but seems to happen more often when I need to take off quick. Doesnt give any warning. I try to take off quick and I suddenly find I dont have any acceleration power (been a few close calls cuz of that)
another problem that cant really be recreated either is a clanking sound beneath car in middle leaning toward front. (About right between front seats). Clanking speeds up and slows down when the truck speeds up and slows down. Clanking is worse when first starting out and taking corners a little too fast or too tight. Dad says it sounds like u-joints. Sounds almost like a rock is stuck in the wheel well. Only of course its not even near the wheels. A similar sound can be heard (sometimes not always) is when switching from drive to reverse, but not back to drive. However that one sounds to be in a slightly diff location, more toward engine but still in general location.
the order of the problems occuring is first the sluggish not wanting to switch from 1st to 2nd starting about 4 month after I bought it May 2005, second the clanking sound starting 2 months ago, and third the humming/vibration on coast 1 month ago.
bought from an auction and salvaged truck from a rear end hit. Did need frame straightened but no other major damage other than cosmetics. Changed oil regularly. Replaced tires right after purchase including both front wheel bearings. Not to sure on this on but something was causing gas tank to leak when fuel pump was engaged, bad seal or somthing. Had it taken in to shop and repaired. This was prolly 5 months after I bought the car. (It didnt change the problem w/ shifting from 1st to 2nd)
had serpentine replace last week, along w/ air filter and oil change and took thottle body cleaner to throttle body. No change to performance problems. S
so much for trying to keep it short. Sorry
Id greatly appreciate any advice as to what this/these problems may be and how I might be able to handle them on my own.
thanks in advance
have the same problem?
Tuesday, May 15th, 2007 AT 9:56 PM