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  #1  
Old 02-10-2006, 12:19 AM
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Thumbs up Bad Injector... how to verify?

I believe I have a bad injector on my SDL, what's the best way to verify that this is indeed happening?

Thanks

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Old 02-10-2006, 01:07 AM
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I would swap in another injector and see if theres any difference. If you dont have one laying around you could have it hooked to a hard line OUTSIDE the engine and look at the spray pattern, (when cranking, not running) see if it drips. I've never done this, its eaiser to just stick in another. You could crack each injector line and figure out which cyl has a problem and swap injectors and see if the problem follows the injector.
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Old 02-10-2006, 01:18 AM
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The sound is centralized within the motor... could I put a piece of hose to the injector then the other side to my ear like a gasser to give any idea of which one is bad?
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'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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Old 02-10-2006, 01:32 AM
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Quote:
Originally Posted by Hit Man X
could I put a piece of hose to the injector then the other side to my ear like a gasser to give any idea of which one is bad?
I haven't had much luck with that, try it. You proly need to figure out which cyl it is, if you haven't done that, and go from there.
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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
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2014 Kubota L3800 tractor
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Old 02-10-2006, 01:45 AM
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I'll give it a shot tomorrow, I was going to go back out to play but I haven't slept in days so I'm beat.
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'87 300SDL 251k
'90 300SEL 326k

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Old 02-10-2006, 03:20 AM
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The best way is to hook up the injector to a tester and observe the spray pattern. I guess you don't have a tester. What makes you think you have a bad injector? Typically you would hear pinging while cruising if you had a bad injector.
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Old 02-10-2006, 03:25 AM
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Thumbs up

Quote:
Originally Posted by DieselAddict
The best way is to hook up the injector to a tester and observe the spray pattern. I guess you don't have a tester. What makes you think you have a bad injector? Typically you would hear pinging while cruising if you had a bad injector.


Idle sound is a bit different than the 603s I've heard on here. I thought it could be injector. T-chain is okay, maybe IP needs to be timed.
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'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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  #8  
Old 02-10-2006, 04:03 AM
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the injectors

on the 603s are sensitive to things that the 616 617s are not. mine kept working loose and would rattle like crazy. also the seals at the tips can cause rattling too. so it could be pinging from other things than the injector being bad.

tom w
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Old 02-10-2006, 08:35 AM
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Quote:
Originally Posted by Hit Man X
The sound is centralized within the motor... could I put a piece of hose to the injector then the other side to my ear like a gasser to give any idea of which one is bad?
what works better than the tube is a thin length of hardwood, i.e., a hickory rake handle. Sound transmission is more efficiently transferred.
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Old 02-10-2006, 09:16 AM
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IIRC, I had a tech take my injectors out and he hooked it up to a machine at the MB shop that did a spray pattern test. While it was OK 40K ago, I think that when it warms up, I will take them out again since they have 100K now and more later and have them cleaned and checked.
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  #11  
Old 02-10-2006, 12:58 PM
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Quote:
Originally Posted by t walgamuth
on the 603s are sensitive to things that the 616 617s are not. mine kept working loose and would rattle like crazy. also the seals at the tips can cause rattling too. so it could be pinging from other things than the injector being bad.

tom w
I beg to differ on that one. I'd say the 616/617 nozzles (240/) are more vulnerable and more likely to have problems than the later nozzles because of the tiny hole in the pintle that can get clogged. The later nozzles don't have these holes, though their spray pattern isn't as misty as that of the older nozzles.

Hit Man X, so far it doesn't sound like you have a bad injector. What is different about your idle? You can also try Diesel Purge or some other cleaner if you have doubts. I'd start there if you haven't already done so.
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  #12  
Old 02-10-2006, 01:01 PM
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Start cracking the injector lines and see if it goes away.

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