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Old 02-27-2017, 11:45 PM   #1
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Default Rough idle

So my 2006 just recently started to run rough this last 2 days . Just got back from the snow park this weekend. It took over an hour for it to warm up to temp. First of all. Then yesterday it started to take a bit longer to start. A couple cranks vs just instantly
I thought it may be the fuel filter. Changed it but no real difference. Got some sea foam in it today not sure if it will fix it . . Just had to replace the intake air temperature sensor. Last week it ran great .
Rough idle at stop light now .
And odd starting behavior.

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Old 02-28-2017, 06:04 AM   #2
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Default Re: Rough idle

Quote:
Originally Posted by Blownglass View Post
So my 2006 just recently started to run rough this last 2 days . Just got back from the snow park this weekend. It took over an hour for it to warm up to temp. First of all. Then yesterday it started to take a bit longer to start. A couple cranks vs just instantly
I thought it may be the fuel filter. Changed it but no real difference. Got some sea foam in it today not sure if it will fix it . . Just had to replace the intake air temperature sensor. Last week it ran great .
Rough idle at stop light now .
And odd starting behavior.

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Does it lose power driving?

Extreme shot in the dark, I think this is pretty rare...had a rough idle and lost power on hills...traced it to the #1 cylinder injector wiring by manipulating the harness with the engine cover off

If you've got unexplained engine codes as well as shorted injector codes, that might be it...hard to tell unless you've got another clue, mine drove me crazy and I was convinced an injector was failing

Probably something else, but that was my experience

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Old 02-28-2017, 07:37 AM   #3
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Default Re: Rough idle

Unplug MAF, does this fix it? You should have a scanner onboard, it really could be a bunch of different things.
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Old 02-28-2017, 02:10 PM   #4
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Default Re: Rough idle

Quote:
Originally Posted by Blownglass View Post
So my 2006 just recently started to run rough this last 2 days . Just got back from the snow park this weekend. It took over an hour for it to warm up to temp. First of all. Then yesterday it started to take a bit longer to start. A couple cranks vs just instantly
I thought it may be the fuel filter. Changed it but no real difference. Got some sea foam in it today not sure if it will fix it . . Just had to replace the intake air temperature sensor. Last week it ran great .
Rough idle at stop light now .
And odd starting behavior.

Sent from my Nexus 6 using Tapatalk
Sounds like an injector might be bad. First sign for me for all 4 that have been replaced to-date was surging forward at idle in gear. Also, puffing at the end of the tailpipe at idle (a hand near the end will feel for that). Run the injector leakoff test to pinpoint the probable bad injector. Also, I'd look at the clarity of fuel by draining a little from the water in fuel drain - you might have picked up some cloudy (wet) fuel that's causing problems.
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Old 03-01-2017, 08:44 PM   #5
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Default Re: Rough idle

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Originally Posted by talkinghorse43 View Post
Sounds like an injector might be bad. First sign for me for all 4 that have been replaced to-date was surging forward at idle in gear. Also, puffing at the end of the tailpipe at idle (a hand near the end will feel for that). Run the injector leakoff test to pinpoint the probable bad injector. Also, I'd look at the clarity of fuel by draining a little from the water in fuel drain - you might have picked up some cloudy (wet) fuel that's causing problems.
It does kind of surge at a stop .. doesn't lose power no codes praying for bad fuel.

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Old 03-02-2017, 01:24 PM   #6
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Default Re: Rough idle

Mine had the same problem when I bought it. I dropped in half a bottle of injector cleaner additive and it smoothed right out. Cheap easy fix if it works.
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Old 03-02-2017, 02:54 PM   #7
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Default Re: Rough idle

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Originally Posted by Seber View Post
Mine had the same problem when I bought it. I dropped in half a bottle of injector cleaner additive and it smoothed right out. Cheap easy fix if it works.
I'll say it so others don't need to.

MERCEDES RECOMMENDS AGAINST SECONDARY FUEL ADDITIVES.

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I added the BG 244 when my fuel gauge was a bit above 1/2 tank. I figure that to be roughly 13 - 15 gallons of fuel.

After 150 miles of running with the BG 244 it seems like my 2004 is now idling and running a bit smoother. That could be a placebo effect. What is not a placebo effect is that my latest cold weather starts no longer have the initial rough running and smoking. The engine starts normally.





So far it seems that the BG 244 diesel fuel additive has not destroyed my engine and may have actually helped some.

FWIW.

vic

Added: Reading some of the DPF discussions that mentioned high(er) RPM operation reminded me.

After adding the BG 244 to my 2004 I have been doing a bit of higher RPM driving by using lower gears. My thought was to keep the BG 244 conditioned (contaminated?) fuel flow through the injectors at a higher rate. Did it help? Would just driving and giving it the "thrash out" without the BG 244 have produced similar results?
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Originally Posted by lindenengineering View Post
Well I suppose I have to confess I am sceptical of "snake oil" fixes!
But in this case the BG line of "fix in a can remedies", seems to work and add up to their claims.

So far as the 244 product is concerned I first used it as an experiement on my Missus' car a 2001 VW Jetta diesel. Now these beast are notorious for plugging up the EGR valve and inlet manifold.

A few 10,000 mile doses of it have kept the inlet tract clear and @ 200,000 Mls recorded of usual urban suburban driving the thing runs very clean and the E test center mentioned it had run very clean when it was last tested.

I was convinced to recommend it which I don't usually do that prefering to take Sailquick's position.

Cheers Dennis
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Originally Posted by lindenengineering View Post
...

Also once you are done add a can of BG's ATC plus transmission additive. Any abnormal burnishing of the lock up internal clutch will be smoothed out by this stuff.
All the best
Dennis
As always clicking on the blue arrow icon within any quote box will take you to the original post/thread.

vic
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Last edited by Aqua Puttana; 06-22-2017 at 02:01 PM.
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Old 03-05-2017, 09:24 PM   #8
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Default Re: Rough idle

I have tried additives no help . Thought maybe it was choking for air. Put new air filter no change . Drives ok until I stop at light . Then is starts the UK and down idle and sometimes it knocks it is intermittent at times and other times it's every start and every stop light. I'm super confused

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Old 03-05-2017, 09:25 PM   #9
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Default Re: Rough idle

If I give it a little press on the accelerator just the slightest bit at a stop light it seems to smooth out

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Old 03-05-2017, 09:28 PM   #10
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Default Re: Rough idle

As was mentioned...if you're going to try and diagnose it yourself...try and borrow or buy a suitable Sprinter code reader...IMHO the sprinter is far too complex to guess

Did you perform the injector test?

While my MIL was not on, there were 42 trouble codes throughout my modules, helped me diagnose a bad engine harness

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