I have a 89 w/ six spd. Bought the car about two months ago. Car had 89,000 on it with a new engine, clutch, etc. at 79,000. I bought it from a 59 yr. old lady that bought it new. she was selling it because she has a new one in the garage w/ a six speed. She handed me a file of receipts showing new motor, clutch, leather interior, exhaust, cats,etc. The car runs great, and in excellent cond. She is very **** about her cars.
I have a vibration that starts at about 1200 rpm. sitting still. I didn't notice the vibration when I bought it, poss. out of excitement. The car has a lot of power, and is extremely tight.
My question to this board is whats up?
I read a post by Carroll Floyd on 11-15-03 about vibration/miss. Several members responded. SRAFT responded that he had a simular problem and it turned out to be an 02 sensor. He also has a six speed.
The work was done by a garage, not a dealership that the lady has always used.
My first thought was maybe clutch, pressure plate, flywheel not in sync. These items only have approx. 11,000 miles. This would be an expensive kinda maybe.
I also thought about taking it to a Chevy dealership and bending over!!!
I am only a shade tree duffer and these sensors and such are way out of my league. How and who can track these problems down?
Again the vibration is there when the car is sitting still.
I need some input
Thanks
Russ :steering:

 

You may want to check the harmonic balancer. Mine spun at about
86,000 mi's.

 

Do you know if the flywheel was replaced. If it was not balanced correctly to engine then it could cause a vibration. Also, if a machine shop tried to machine the flywheel you could have some problems since the dual mass setup can't be machined. So could anything along the serpentine belt, a bad pulley, etc.

Do you have any problems with the engine other than the vibration? Any stumbling, noises? Also where do you feel the vibration through. The seat, the pedals, the shifter, etc.?

 

The vibration is mostly through the shifter. I assumed I would feel it more there because it is connected to the trans and motor.
Who can check the balancer, and isn't the shaft slotted with a pin?

 

My 94 Rippie car had a vibration at about 3400 rpm and left at 4200. Turned out to be the flywheel, which had been replaced along with the clutch by yours truly. I followed instructions and added the weights in what I thought were the positions from the previous dual mass. However, after lengthy discussions, and ruining the flywheel by sending it to be zero balanced by a respected machine shop (they drilled into a grease chamber within the dual mass - slung about a pound of grease inside the bell housing), I talked with the product engineer for dual mass, who works with the Corvette engine assembly, and he said unless you are for sure about the fine balancing, best to just install as it comes already properly balanced. By the way, he also said they "hot balance" the engine with the flywheel and clutch assembly at the plant b4 install into the Corvette - not done with Camaro's...he said Corvette is more sensitive to imbalance than the Camaro...and then there's the Corvette's price and performance which warrants the fine balance. Anyway, put the new dual mass in right out of the box, and it's smooth as a baby's but all the way to 6k, don't know above that yet. If you do have to replace the flywheel, shop around, they can be had for about 660.00 vs 1100 retail at the dealer. Wish you luck.

 

Do you feel it when parked and just rev the motor to around 1200rpms? If so it may just be the TPS (throttle position sensor). With the high gears that these cars have they are operated in that rpm range alot. The TPS is just a variable resistor, therefor over the years it can get a flat spot in it and confuse the ECM. They cost about $45.00, so it may be worth a try. If you are not familiar with what it is or were it goes, buy a repair manual. If you are going to tinker, you'll need one.

 

If it is poss. sensors, would I be better off taking it to a dealership???

 

Its just a guess on my part. If you want to try get a good replacement unit, AC Delco or equal, and just replace it. Its on the front of the throttle body on the passengers side. It has a 3 wire plug going into it and is held on with 3 screws. Like I said you need to buy a Haynes or better manual at one of the local auto parts stores so you can see the pictures, etc, that will explain it better. If don't want to try that, and want to get it fixed, your only choice is the dealership or a good repair shop.
Good Luck