Knocking/ping sound
Team Owner
Joined: Mar 2002
Posts: 47,647
Likes: 1
From: Queens, New York Life begins at 183 mph....
St. Jude Donor '08-'09
Originally Posted by vabadger
getting a ping/knocking sound while accelerating in 6th from around 55-65 mph ..had knock sencor replaced..no help...1998 coup with 60,000
Any ideas?
Any ideas?
Burning Brakes
Joined: Oct 2002
Posts: 797
Likes: 1
From: Sunny Earthquake Country, USA On the Left Coast (which is becoming more Right!)
Lugging...
Originally Posted by vabadger
getting a ping/knocking sound while accelerating in 6th from around 55-65 mph ..had knock sencor replaced..no help...1998 coup with 60,000
Any ideas?
Any ideas?
It will always knock under those circumstances.
Lugging tends to break down the oil wedge that bearings need to prevent metal to metal scraping.
Always downshift at least to 4th at 55.
Nothing wrong with driving in 6th steady state even as low as 40 mph, you just absolutely must not accelerate in 6th (unless you're doing 140 mph) literally.
Roy
Race Director
Joined: May 2000
Posts: 14,542
Likes: 5
Originally Posted by 7.0sc SuperVette
You don't accelerate from 50 mph in 6th-you're lugging. It will always knock under those circumstances.... Always downshift at least to 4th at 55... you just absolutely must not accelerate in 6th (unless you're doing 140 mph) literally....
As a matter of fact, the operating manual recommends shifting into 6th gear at 50 mph. So, how do you not accelerate from 50 mph in 6th, if GM tells you to shift into 6th at 50 mph in the car's operating manual.
Here's the link (admittedly a C6, but I don't have a C5 manual in pdf format): http://www.greathound.com/c6/manual/2k05corvette.pdf
See page 2-27.
On the knock/ping -- when's the last time you ran some fuel system additive through the car?
Race Director
Joined: May 2000
Posts: 14,542
Likes: 5
Originally Posted by vabadger
Thanks EHS..I though I read somewhere shifting at those speeds was OK...started to doubt myself...Cant remember last time, or if I ever have added anything to the fuel system.
No problem.I had some pinging/knocking myself. C5c4specialist, who maintains my car, threw in a couple of tanks worth of a cleaner like this:
http://www.chevron.com/prodserv/nafl...t/fueladd.shtm
This not only cleans the system and carbon depositis, it also helps the dreaded fuel sensor and gauge going to zero issue.
Another thing, have the dealer program the PCM to the latest GM spec. They get a CD every month. The last reprogram on my car, about six months ago, did wonders for the power and the pinging. You can get a good dealer to do it for free.
Good luck.
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Le Mans Master
Joined: Dec 2000
Posts: 9,909
Likes: 1,858
From: Hot Springs AR
Originally Posted by 7.0sc SuperVette
You don't accelerate from 50 mph in 6th-you're lugging.
It will always knock under those circumstances.
.
.
Always downshift at least to 4th at 55.
Nothing wrong with driving in 6th steady state even as low as 40 mph, you just absolutely must not accelerate in 6th (unless you're doing 140 mph) literally.
It will always knock under those circumstances.
.
.
Always downshift at least to 4th at 55.
Nothing wrong with driving in 6th steady state even as low as 40 mph, you just absolutely must not accelerate in 6th (unless you're doing 140 mph) literally.
I agree with EHS, put some Techron fuel additive in the fuel and see if things clear up. I use it about twice a year or so.
HTH, and have a good one,
Mike
