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Old 12-20-2007, 12:15 PM
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Join Date: Feb 2002
Location: Big Island- Hawaii
Posts: 106
617 300D Injector Test with a Screwdriver?

So, a mechanic was working on a friends car and put a screw drive on the injector (of her 300sdl) and put the plastic end up to his ear.

She tells me that he was able to diagnose 3 "bad" injectors this way. My question is what was he hearing and does this trick actually work.

I would love to do this with my 300d to check and see if I should replace the injectors (without going to the trouble of popping them out and pop testing them).

Any thoughts on what to listen for?


1985 300D- 222k- (bad transmission)
1980 300D- (parts car)
1982 300SD- 242k
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Old 12-20-2007, 12:19 PM
shingleback's Avatar
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Join Date: Jul 2006
Location: Vancouver, BC Canada
Posts: 265
This is the same as using an engine stethoscope; just listen for the sound of the injector popping open. If you have an injector that is not working properly you will be able to hear the difference; all the others will sound pretty well the same.

'98 E300 DT
'87 190D 2.5 turbo RIP
'92 S500 Sold
'03 3.2TL-S A-Spec
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Old 12-20-2007, 02:36 PM
theo3000's Avatar
Join Date: Dec 2006
Location: Apple Valley CA
Posts: 300
I used a cheap stethoscope from Harbor Freight to listen to my valves after an adjustment. At least I thought I was listening to the valves, I put the tip on each of the injectors.

I didn't really know what I was hoping to hear, but all cylinders sounded similar, so I thought that was good.
1985 300D California
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Old 12-20-2007, 02:40 PM
winmutt's Avatar
85 300D 4spd+tow+h4
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,331
If you listen carefully you can hear the sound of the injectors separate from all the other clanking without any instruments.

1987 300D Sturmmachine
1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
OBK #42
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