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  #1  
Old 10-04-2010, 04:19 AM
1978 240D W123--1983 230E
 
Join Date: May 2010
Location: Kent UK
Posts: 55
W123 230E Backfire

Yesterday the only problem I had with my w123 was the fact that it was losing vacuum when parked, so after checking all the doors and reservoir I decided to check the pipe going to the intake manifold. I removed the complete air filter housing and then the rubber pipes underneath, cleaned them all up, check the joint and put it all back together.

Now the car is backfiring or popping. Its a strange issue as it doesn't happen until the car has done about 30miles, its not really evident when in neutral and revving the engine and it seems to come and go it even seems like its works going uphill and not so bad downhill. Its more evident at low rpm and the oil pressure now seems to be more active then before. It is not effecting the performance.

Any ideas what I have done or what it could be?
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  #2  
Old 10-04-2010, 07:22 AM
Stretch's Avatar
...like a shield of steel
 
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,452
Wild guess - you've dislodged an electrical connector that separates when it gets warm - you need the warmth of 30 miles for this problem to arise?

Check you're electrical connectors close to where you've been working - if my wild guess is right it'll be on the low voltage ignition side...
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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  #3  
Old 10-04-2010, 09:10 AM
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The only thing you could have done IS dislodge a vacuum line OR leave a vacuum line loose.
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  #4  
Old 10-04-2010, 10:26 AM
1978 240D W123--1983 230E
 
Join Date: May 2010
Location: Kent UK
Posts: 55
Well I have just taken it all apart again and re-sealed all the joints. Ill drive it home tonight which is 80 miles and see what happens.
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  #5  
Old 10-06-2010, 01:48 PM
Stretch's Avatar
...like a shield of steel
 
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,452
Well...

Quote:
Originally Posted by cdc02254 View Post
Well I have just taken it all apart again and re-sealed all the joints. Ill drive it home tonight which is 80 miles and see what happens.
And did that work?
__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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