Pinking??

[ChrisL]

Hello,

Could someone please help me?

I have a 1996 E 230 Avantgarde Estate, petrol. It has done approx. 88thousand miles and a couple of months ago the car started making a noise which I thought was the engine pinking. After taking advice from what had previously been reliable sources (with my previous cars), I had the automatic transmission thoroughly checked, the exhaust inspected with a fine tooth comb, two sessions of fuel injector cleaner and upgrading the fuel from 95 oct. to 98, and finally changing the plugs to NGK multi electrode - all to no avail. The noise occurs at about 30-35mph, 1500 revs on a very light throttle. I have not heard it at any other time including heavy acceleration. TIA.
ChrisL

 

[television]

Pinking accurs during pulling from low revs, there are no known faults for pinking ( a tinkling sound) the only mod as from 11/95 was a modified timing gear on the crankshaft for noises like howling / turbine at around 2000 RPM. there are external mods on the belt tensioner where a stud bolt and a collar nut becomes loose (LH thread)

Malcolm

 

[ChrisL]

Thank you, what belt do you mean as I thought that the engine had a timing chain not belt and there is no turbo, it merely injection.

ChrisL

 

[television]

The belt on front of engine that drives alternator etc, the tensioner keeps it tight, fairly common fault.

Malcolm

 

[ChrisL]

Thank you, I will try a new drive belt as I have a spare, the tensioner pulley and damper were replaced about 8000 miles ago.

ChrisL

 

[television]

Thank you, I will try a new drive belt as I have a spare, the tensioner pulley and damper were replaced about 8000 miles ago.

ChrisL

Chris, I do not think it is the belt itself.

malcolm

 

[piestore]

pinking

HI

just a thought, it could be the inlet cam adjustable timing sprocket, the test is to unplug the actuator on the front timing cover and see if it still makes the noise. I am asuming you have the 111 engine

 

[ChrisL]

Thankyou,
I do not know at this time what engine it is, how do I find out?

ChrisL

 

[Bolide]

Exhaust bracket

If it was a W124 I'd say it was the exhaust bracket by the gearbox that's loose or snapped. Worth checking. It happened on my car at 2200 rpm only

Nick Froome
www.w124.co.uk