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injection noise/nailing
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willbhere4u Offline
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Post: #1
injection noise/nailing
So my 240d turbo is nailing badly at idle when hot!

It has been getting worse to night I replace some collapsed leaking fuel supply line and filters and it stopped nailing almost completely!

So I thought I would crack each injector to listen for any noise! If I crack cylinders 1,2,4 the car will slow down and Nail really badly! If i crack # 3 it slows down but no noise nailing

If the engine drops even slightly below idle it starts nailing really badly on #3

I'm going to swap injectors this weakened and see if the problem follows the injector or if it stay my guess is a weak injection pump.

As rebuilding the injectors and doing a valve adjustment hasn't changed it

1987 300SDL 6spd manual om606.962 work in progress
1985 300td euro 5spd wagon 5cyl 5spd
1964 220S Heckflosse 4spd column shift
05-03-2010 09:27 PM
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dude99 Offline
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Post: #2
RE: injection noise/nailing
Have you checked the the IP timing?
05-03-2010 09:54 PM
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willbhere4u Offline
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Post: #3
RE: injection noise/nailing
Not yet I was thinking of setting it at 26* like the turbo cars are! But its only that one cylinder that nails!

1987 300SDL 6spd manual om606.962 work in progress
1985 300td euro 5spd wagon 5cyl 5spd
1964 220S Heckflosse 4spd column shift
05-03-2010 10:02 PM
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Alastair E Offline
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Post: #4
RE: injection noise/nailing
Quite possibly the Injectors are as old as the car....

Like 30 Years old!

Prolly could well do with replacing the nozzles and re-setting up....

No point on earth in just cleaning Old Injectors.....
05-04-2010 01:39 PM
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willbhere4u Offline
Six in a row make her go!
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Post: #5
RE: injection noise/nailing
They are rebuilt as previously stated? They maybe have 2500k on them since I rebuilt them! and it nailed before then as well

This weak end I'm going to swap the known nailing cylinder's injector to figure out if its the Injection pump of the injector!

If the nailing changes cylinders its the injector! if it stays it's not the injector!

1987 300SDL 6spd manual om606.962 work in progress
1985 300td euro 5spd wagon 5cyl 5spd
1964 220S Heckflosse 4spd column shift
05-04-2010 08:42 PM
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tomnik Offline
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Post: #6
RE: injection noise/nailing
check the ball in the pre chamber while the injector is out.

Tom
05-05-2010 06:37 AM
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willbhere4u Offline
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Post: #7
RE: injection noise/nailing
What should I look for? Dose it come out?

1987 300SDL 6spd manual om606.962 work in progress
1985 300td euro 5spd wagon 5cyl 5spd
1964 220S Heckflosse 4spd column shift
05-05-2010 11:48 AM
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tomnik Offline
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Post: #8
RE: injection noise/nailing
look into the pre chamber with a torch and check if the ball inside is still there. Sometimes it happened that the ball is blown/melted/broken away and this will cause also nailing on one single cylinder.

Tom

(05-05-2010 11:48 AM)willbhere4u Wrote:  What should I look for? Dose it come out?
05-05-2010 02:57 PM
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willbhere4u Offline
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Post: #9
RE: injection noise/nailing
Thanks I will do that! Since I'm in the U.S. I'll use a flash light to be safe side LOL Tongue

1987 300SDL 6spd manual om606.962 work in progress
1985 300td euro 5spd wagon 5cyl 5spd
1964 220S Heckflosse 4spd column shift
(This post was last modified: 05-05-2010 05:28 PM by willbhere4u.)
05-05-2010 05:28 PM
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Einar Offline
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Post: #10
RE: injection noise/nailing
Also check the pressure-pipe(?) between the pump & injector, if it`s damaged it may disturb the injection. I don`t know if it may cause nailing, but I would check it.
05-07-2010 01:37 AM
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willbhere4u Offline
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Post: #11
RE: injection noise/nailing
That's a good idea I'll check it out closely when it's off

1987 300SDL 6spd manual om606.962 work in progress
1985 300td euro 5spd wagon 5cyl 5spd
1964 220S Heckflosse 4spd column shift
05-07-2010 09:14 AM
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