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Discussion Starter #1
When you start it cold it has to worm up before you can drive it ore even idle it up. If you don't wait until it warms up it will just stall. When it warms up it runs perfect. I had changed a temperature sensor on a back of the engine block made no differences. Do not see any vacuum leaks, know what?
 

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CH4S Admin , Outstanding Contributor
1985 500SEC, 1991 190E 2.6.
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When you start it cold it has to worm up before you can drive it ore even idle it up. If you don't wait until it warms up it will just stall. When it warms up it runs perfect. I had changed a temperature sensor on a back of the engine block made no differences. Do not see any vacuum leaks, know what?
Have you tried a forum search? The archive has a wealth of information.

Please click 'User CP' on the top tool bar, and complete your profile with a location and model of your car.
It makes it easier for members to offer advice. MB produced different, and region / Country specific versions of our cars.

Welcome, to take advantage of all the forum features, please re visit the 'Welcome to the Forum' tutorial sticky on top of the W126 page, as well as the two DIY stickies.
It will show how to search the forum (3 words min.), and has a link to the Russian MB site where you can run a VIN#.
Cheers
 

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2007 S550
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Mine operates similar to yours. I'll start it up, let it warm for a few minutes and then take off. If I don't, it's a little sluggish but will not stall. As far as the temp switch on the back of the block, I believe it works with the cold start valve to assist in initially starting the car when the engine is cold. I don't think this has any effect on the operation once the car has started, but maybe someone else can chime in.

Htown
 

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1991 300 SE
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If you don't wait until it warms up it will just stall. When it warms up it runs perfect. I had changed a temperature sensor on a back of the engine block made no differences.
Then you may have a problem with the EHA. The engine temp sensor (coolant temp) sends temp data to the ECU which in turn controls the EHA. The EHA ensures the fuel mixture is such that the engine won’t stall when cold. A properly functioning engine will idle at a faster speed when cold (+/- 900 RPM) then slow down when warm.

Htown, you may have a partially functional EHA.

It wouldn’t hurt to check the EHA for leaks or cracks.
 

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Hey meren, this is a longshot but it happened to me, make sure you didn't knock loose any lines, hoses, wires, etc to the smog/air pump. I disconnected mine to isolate a problem and it was a hard start, hold the gas down idle until I hooked it back up.
 

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1965 220S, 1999 Volvo V70 (wagon), 2006 Ford Crown Vic Police Interceptor, 72 350SL 4 Speed
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Mine has a similar problem. It idles fine but is a little sluggish when cold. The coil wire under the distributor cover has a burn spot which I covered with silicone rubber but I still have the same problem. Next, I figure the EHA needs a tweek as does the feedback pot on the CIS box.
 

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Discussion Starter #7
Mine has a similar problem. It idles fine but is a little sluggish when cold. The coil wire under the distributor cover has a burn spot which I covered with silicone rubber but I still have the same problem. Next, I figure the EHA needs a tweek as does the feedback pot on the CIS box.
Thanks.
Can you tell me where is EHA and CIS is located?
 

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Discussion Starter #8
Then you may have a problem with the EHA. The engine temp sensor (coolant temp) sends temp data to the ECU which in turn controls the EHA. The EHA ensures the fuel mixture is such that the engine won’t stall when cold. A properly functioning engine will idle at a faster speed when cold (+/- 900 RPM) then slow down when warm.

Htown, you may have a partially functional EHA.

It wouldn’t hurt to check the EHA for leaks or cracks.
Thanks, can you tell me where is EHA located and I did change a temp sensor on a back of the engine block are you saying there is another one that i have to change?
 

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2007 S550
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Not sure if there is a problem. I just had it checked and although the indy did not mention the EHA, he did mention that the Lambda was off. It was 8.5% initially and he adjusted it to 50%. My problem now is starting. It very seldom starts on the first turn, but always on the second. Also, I have noticed that if I hold the key long enough it will sometimes start on the first turn. Not sure if this is EHA related, but assumed it was either cold start valve or the temp switch on the block. Any thoughts?
 

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CH4S Admin , Outstanding Contributor
1985 500SEC, 1991 190E 2.6.
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Thanks, can you tell me where is EHA located and I did change a temp sensor on a back of the engine block are you saying there is another one that i have to change?
Please read post # 2.
 

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1982 280 se aut. ecc. - sold
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Not sure if there is a problem. I just had it checked and although the indy did not mention the EHA, he did mention that the Lambda was off. It was 8.5% initially and he adjusted it to 50%. My problem now is starting. It very seldom starts on the first turn, but always on the second. Also, I have noticed that if I hold the key long enough it will sometimes start on the first turn. Not sure if this is EHA related, but assumed it was either cold start valve or the temp switch on the block. Any thoughts?
Accumulator? FPR?

gr J
 

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2001 M-B E320 (W210)
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Please read post # 2.
When I do a SEARCH for this: where is EHA located

I get this:

The search term you specified (is) is under the minimum word length (3) and therefore will not be found. Please make this term longer. If this term contains a wildcard, please make this term more specific.

Did you try the SEARCH feature is a frequent reply and tends to be way over-rated; I know, because I try it all the time and spend way too much time getting unrelated information, images that are no longer supported and no longer viewable and dead links. Not sure why so many posts suggesting it's use; every forum has a search feature and Google is the ultimate search feature... besides, I think part of the enjoyment here is the interaction with members, getting current information from someone who has already 'been there/done that'... if we relied solely on the search feature for answers, then the interaction is nothing more than looking through old databases.
 

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Richard - the reason for the message appears to be that EACH word has to be more than 3 characters, so "a", "at", "an", "in" etc won't work. It is quite limiting, has been discussed multiple times, and is what it is. I usually spend a certain amount of time searching (using less words and weeding through the extra stuff) then when I can't find what I want, post a question and state up front I've already searched and came up empty.
 

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CH4S Admin , Outstanding Contributor
1985 500SEC, 1991 190E 2.6.
Joined
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40,681 Posts
When I do a SEARCH for this: where is EHA located

I get this:

The search term you specified (is) is under the minimum word length (3) and therefore will not be found. Please make this term longer. If this term contains a wildcard, please make this term more specific.

Did you try the SEARCH feature is a frequent reply and tends to be way over-rated; I know, because I try it all the time and spend way too much time getting unrelated information, images that are no longer supported and no longer viewable and dead links. Not sure why so many posts suggesting it's use; every forum has a search feature and Google is the ultimate search feature... besides, I think part of the enjoyment here is the interaction with members, getting current information from someone who has already 'been there/done that'... if we relied solely on the search feature for answers, then the interaction is nothing more than looking through old databases.
The benzworld search feature is far from perfect, and is in the process of being improved.
Searching through the data base is time consuming (I speak from personal experience), but can get good results.
It is surprising to see how many members never bother to read the 'Welcome to the Forum' tutorial sticky, or peruse the DIY, and how many new members omit a location in their profile
At the very least, searching older related post will afford to ask better informed and more specific questions.
Most of us lead busy lives and value time. All benzworld moderators are honorary, and certainly don't enjoy having to point out certain available forum features ad nauseum.
Cheers
 

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2001 M-B E320 (W210)
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The benzworld search feature (3 words minimum) is far from perfect, and is in the process of being improved.
Searching through the data base is time consuming (I speak from personal experience), but can get good results.
It is surprising to see how many members never bother to read the 'Welcome to the Forum' tutorial sticky, or peruse the DIY, and how many new members omit a location in their profile
At the very least, searching older related post will afford to ask better informed and more specific questions.
Most of us lead busy lives and value time. All benzworld moderators are honorary, and certainly don't enjoy having to point out certain available forum features ad nauseum.
Cheers
I certainly understand your point regarding using the search feature; my point is only that if someone doesn't use it, or can't find the answer they are looking for, they post the question(s) in a thread. That gives people like me to an opportunity to read about a question or problem that I might not have thought about, or a problem that hasn't happened to me yet. (Every one in a while I even know the answer!!) That in turn gives me the chance to learn and repair, or maybe prevent, a problem that never occured to me... if we obtain all the answers from a database, then the question never gets posted, and I never know about that particular problem, nor or the 'solutions' that follow by way of replies... so, yes, use the search feature, but for me, I like reading the different threads and questions... to me, that's what a forum is all about.
 

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CH4S Admin , Outstanding Contributor
1985 500SEC, 1991 190E 2.6.
Joined
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40,681 Posts
Richard - the reason for the message appears to be that EACH word has to be more than 3 characters, so "a", "at", "an", "in" etc won't work. It is quite limiting, has been discussed multiple times, and is what it is. I usually spend a certain amount of time searching (using less words and weeding through the extra stuff) then when I can't find what I want, post a question and state up front I've already searched and came up empty.
Best explanation yet, ... so i shamelessly plagiarized from you and added it verbatim to the 'Welcome' sticky.
Hope you don't mind.
Cheers,
Horst
 

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CH4S Admin , Outstanding Contributor
1985 500SEC, 1991 190E 2.6.
Joined
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40,681 Posts
I certainly understand your point regarding using the search feature; my point is only that if someone doesn't use it, or can't find the answer they are looking for, they post the question(s) in a thread. That gives people like me to an opportunity to read about a question or problem that I might not have thought about, or a problem that hasn't happened to me yet. (Every one in a while I even know the answer!!) That in turn gives me the chance to learn and repair, or maybe prevent, a problem that never occured to me... if we obtain all the answers from a database, then the question never gets posted, and I never know about that particular problem, nor or the 'solutions' that follow by way of replies... so, yes, use the search feature, but for me, I like reading the different threads and questions... to me, that's what a forum is all about.
While personal interaction is what makes BenzWorld work, good forum etiquette would be to do a search first, and then ask a more specific question / try to clarify still open points.
When I see a thread with an unanswered question to which the solution may be found by a search through the archive, I direct the member to the 'Welcome to the Forum' tutorial sticky, which the member may not have taken the time to read.
We are fortunate to have a number of resident experts, but even their patience might get taxed by questions that have been asked and answered numerous times before.
When we call our xxx $ an hour attorneys with questions, we prepare with a bit of research in order not to waste valuable time.
IMO, when experts give freely of their time and expertise, we should afford them the same courtesy, and perhaps add the occasional 'thank you.'
Cheers
 

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2000 ML320 / 1988 300SE / 1985 380SE / 1969 280SE
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I am with you

Sometimes we need to freshen up what we know rather than relying on the old database (but still valuable information).
Because someone else who refer to that old database might have come up with better solutions.
However, I do sincerely appreciate all those members who spare their valueable time for newbies.

I certainly understand your point regarding using the search feature; my point is only that if someone doesn't use it, or can't find the answer they are looking for, they post the question(s) in a thread. That gives people like me to an opportunity to read about a question or problem that I might not have thought about, or a problem that hasn't happened to me yet. (Every one in a while I even know the answer!!) That in turn gives me the chance to learn and repair, or maybe prevent, a problem that never occured to me... if we obtain all the answers from a database, then the question never gets posted, and I never know about that particular problem, nor or the 'solutions' that follow by way of replies... so, yes, use the search feature, but for me, I like reading the different threads and questions... to me, that's what a forum is all about.
 

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Best explanation yet, ... so i shamelessly plagiarized from you and added it verbatim to the 'Welcome' sticky.
Hope you don't mind.
Cheers,
Horst
Sehr gut!
 

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1988 420 SEL
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When I do a SEARCH for this: where is EHA located

I get this:

The search term you specified (is) is under the minimum word length (3) and therefore will not be found. Please make this term longer. If this term contains a wildcard, please make this term more specific.

Did you try the SEARCH feature is a frequent reply and tends to be way over-rated; I know, because I try it all the time and spend way too much time getting unrelated information, images that are no longer supported and no longer viewable and dead links. Not sure why so many posts suggesting it's use; every forum has a search feature and Google is the ultimate search feature... besides, I think part of the enjoyment here is the interaction with members, getting current information from someone who has already 'been there/done that'... if we relied solely on the search feature for answers, then the interaction is nothing more than looking through old databases.

Try a google search which oftentimes leads to a relevant benzworld thread.

Regards,

Matt
 
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