What causes my VW Corrado G60 engine to knock under load?

Question

When I take off in first gear up a hill the engine tends to knock a bit. Any ideas how I can cure this?
Thanks

Additional Details

it's a mechanical knock

Answer 1

Best Answer - Chosen by Voters

Maybe there's a loose motor mount or suspension piece that is rattling.

Could be the engine itself - bad spark plug wires, bad spark plugs, too much boost, too little octane?

Answer 2

Don't accelerate so hard, take it gently, nearly all engines complain when pushed too hard.

Answer 3

well you want to hope its not the big ends....is it a mechanical knock or timing knock?...
ive got on,well just sold it....has your charger blew yet?
ive got a spare lump ill be listing it on ebay in the new year.

Answer 4

Mechanical knock? That don't sound good. Take it to a good mechanic to have them hear it.
I had a knock once after doing 9 hrs of steady driving and stopping the car for a quick coffee. I just accelerated and hoped the knock would go away.
It did. A connecting rod was bending and popped a hole thru the crankcase and seized up the motor. No more knock. Also no more run. History.
You don't want to go there.

Answer 5

Don't know the answer, but I own a 92 VR6 and i just have to throw up the imaginary VDUB sign at you and say "keep her on the road!" Sorry I couldn't help!

Source(s):

Dub love. 'Rrado's FTW.

Answer 6

Big ends going, very expensive, get it looked at as soon as possible.

Answer 7

Sounds like piston slap,that's when one or more pistons have a worn thrust face and tend to 'rock' in the cylinder bores when under load at heavier throttle.The test for conformation is to accelerate in too high a gear,say 4th gear from a lower than usual speed intentionally loading the engine,if you can induce the knock this way, then its piston slap,its an abnormal wear pattern caused by poor driving technique,basically,someone has been using too high a gear instead of shifting down.The only cure is an engine bore overhaul,re-bore and new pistons,if you get this done on strip down the wear will be visable on the piston skirt on the leading edge.But,on the bright side,the knock is when it's wearing,so if you can avoid doing it,it won't get worse,the engine could last for ever.the more knock the more wear.

Source(s):

The engine on my BMW has piston slap,and has done since the day I bought it,about 30 thousand miles ago.