Re: [diesel_mercedes] 86 300SDL poor initial acceleration

 

Possibly a small crack in a fuel line letting in air?  When you start pulling more fuel, the crack seals?

Check the fuel lines and replace if necessary.  You can use silicone grease on the outside to seal them temporarily to verify that's the problem.

Carl


On 7/12/2011 8:34 PM, professormobesser wrote:

 

I've had a recurrent problem with my 86 300SDL. It has about 310K on the engine. The initial acceleration can be very sluggish; rpm won't go above about 1500, even when I floor the accelerator, and the car just crawls until it starts to get above 10 or 15mph. Once I get above 15 or 20 mph, rpm will ramp up normally, kicking up above 3000 rpm or more before shifting to the next gear, and acceleration is fine. But initial acceleration, especially when starting up a hill from a stop, can be almost nil. My mechanic had the fuel injector pump rebuilt; that cured the problem for a while. Now the problem has returned. It seems worse when the engine is cold or when operating at higher altitudes; at 6000 feet above sea level, even after a long drive and a fully warmed-up engine, the car just wouldn't start up a steep hill from a stop. The engine ran; just no acceleration. I run my 300SDL on B99 biodiesel in summer and B50 in winter. Any ideas?



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[diesel_mercedes] 86 300SDL poor initial acceleration

 

I've had a recurrent problem with my 86 300SDL. It has about 310K on the engine. The initial acceleration can be very sluggish; rpm won't go above about 1500, even when I floor the accelerator, and the car just crawls until it starts to get above 10 or 15mph. Once I get above 15 or 20 mph, rpm will ramp up normally, kicking up above 3000 rpm or more before shifting to the next gear, and acceleration is fine. But initial acceleration, especially when starting up a hill from a stop, can be almost nil. My mechanic had the fuel injector pump rebuilt; that cured the problem for a while. Now the problem has returned. It seems worse when the engine is cold or when operating at higher altitudes; at 6000 feet above sea level, even after a long drive and a fully warmed-up engine, the car just wouldn't start up a steep hill from a stop. The engine ran; just no acceleration. I run my 300SDL on B99 biodiesel in summer and B50 in winter. Any ideas?

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[diesel_mercedes] Re: Newbie vacuum question # 2

 

Can you tell me which vacuum line should not hold vacuum, color or what it connects to?

By damaging the oil, do you mean the engine oil? Under positive pressure not much water should enter the line.

Can I blow cigarette smoke through the line and look for where the smoke comes out?

thank you
Rodger

--- In diesel_mercedes@yahoogroups.com, Nate Rector <tccservice111@...> wrote:
>
> If its leaking inside water will damage the oil.One vac line under hood will not hold vac at all.All others should not leak.
>
> --- On Tue, 7/12/11, rkitt2002 <rkitt@...> wrote:
>
>
> From: rkitt2002 <rkitt@...>
> Subject: [diesel_mercedes] Newbie vacuum question # 2
> To: diesel_mercedes@yahoogroups.com
> Date: Tuesday, July 12, 2011, 10:27 AM
>
>
>  
>
>
>
> If I use the positive pressure side of my vacuum pump, can I use soapy water to find the leak (like on a tire)?
>
> thank you again
> Rodger
>

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[diesel_mercedes] Re: Newbie vacuum question # 1

 

Rodger--you are correct. One of the best tools for a diesel Mercedes owner to have is a Mityvac or equivalent hand vacuum pump, available a lot of places including Harbor Freight. Use golf tees to plug off individual lines as needed for temporary fixes until you get to the leak. The vacuum diagram for your car is available and may also help. I think Performance Parts may have it onlne.
John in ID

--- In diesel_mercedes@yahoogroups.com, "rkitt2002" <rkitt@...> wrote:
>
> Hello All
>
> I am trying to track down the vacuum leaks in my new 1978 300D.
>
> I am assuming that if I pump vacuum into a line and it immediately looses the vacuum it is not supposed to work that way, there is a big leak.
>
> I am also assuming that if it slowly looses the vacuum there is a smaller leak.
>
> Please let me know if I am right.
>
> thank you
> Rodger
> Placitas, New Mexico
>

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Re: [diesel_mercedes] Newbie vacuum question # 2

 

If its leaking inside water will damage the oil.One vac line under hood will not hold vac at all.All others should not leak.

--- On Tue, 7/12/11, rkitt2002 <rkitt@netscape.com> wrote:

From: rkitt2002 <rkitt@netscape.com>
Subject: [diesel_mercedes] Newbie vacuum question # 2
To: diesel_mercedes@yahoogroups.com
Date: Tuesday, July 12, 2011, 10:27 AM

 
If I use the positive pressure side of my vacuum pump, can I use soapy water to find the leak (like on a tire)?

thank you again
Rodger

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[diesel_mercedes] Newbie vacuum question # 2

 

If I use the positive pressure side of my vacuum pump, can I use soapy water to find the leak (like on a tire)?

thank you again
Rodger

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Re: [diesel_mercedes] '83 300D Suspension noise. with video. '83 300D Suspension noise. wi

 

Dean,

It's hard to follow the indy film, I was waiting for a gremlin or
something to jump out.
Does that sound occur both when turning the wheel and when just pushing
up and down on the car?
Just to check the easy things first, hows the ATF level and color in the
power steering pump, and how about belt tension?

Rob
'85 300D
Garden Grove, CA

On 7/12/11 1:15 AM, diesel_mercedes@yahoogroups.com wrote:
> '83 300D Suspension noise. with video. '83 300D Suspension noise. wi
> Posted by: "Dean Chandler"deanstud@comcast.net deanstud
> Date: Mon Jul 11, 2011 11:23 pm ((PDT))
>
> Link to video
>
> http://www.youtube.com/watch?v=iqOh1q8J1zM&feature=youtube_gdata
>
> My wife came home and told me the car was making a weird noise. I went
> out to look and OMG that is the most awful noise I have ever heard from
> a car.
>
> The video pretty much enplanes it all. Its last "LOF" was about 4k miles
> ago, I don't know how much L is included in the LOF, but it was at a non
> dealer Mercedes Benz friendly shop, where the car was always serviced
> before I got it.
>
> Also, as said in the video, the "front end" was rebuilt @ 298k miles in
> 10/09.
>
> upper/lower control arms/bushings, tie rods, idler arm.
> __________________
>
> -- -Dean E. Chandler '86 SDL '83 300D -=KE7TWY=- Cornelius, Oregon
> deanstud@gmail.com

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Re: [diesel_mercedes] diagnostic help

 

Check the tires.
I had a tire with a bulge and it only appeared as a noise at speed (65+).
When I got home after a trip and saw the tire bulge, I was
shocked...lucky it didn't blow out on the road.
Good idea to check the Flex disks too.

Rob
'85 300D
Garden Grove, CA
==

On 7/12/11 1:15 AM, diesel_mercedes@yahoogroups.com wrote:
> Re: diagnostic help Posted by: "Steve Schaefer" sschaefer50@gmail.com
> steven0356 Date: Mon Jul 11, 2011 9:25 am ((PDT)) Thanks Stan, but if
> it was a Separated belt or a bulge would you not hear it all the time?
> Steve On Mon, Jul 11, 2011 at 12:18 PM, Stan George
> <ssgkag@frontier.com> wrote:
>> > **
>> >
>> >
>> > Suspect a separated belt on the rear tire or other bulge.
>> > --
>> > Stan George Portland<<
>> >
>> >

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[diesel_mercedes] Newbie vacuum question # 1

 

Hello All

I am trying to track down the vacuum leaks in my new 1978 300D.

I am assuming that if I pump vacuum into a line and it immediately looses the vacuum it is not supposed to work that way, there is a big leak.

I am also assuming that if it slowly looses the vacuum there is a smaller leak.

Please let me know if I am right.

thank you
Rodger
Placitas, New Mexico

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