190e idle problems - mechanical or electrical ?

Hi Group!

Ok...1/2 good news. changes oil and filter now engine runs smooth, with no extra noises.

still...the rough idle presists...i am beginning to think, the "bad head gasget" wasn't it after all. i mean, the gasket didn't look to good after 160k miles, but was still funktional.

now, i am clueless, could it be an electrical problem after all? once the enigine gets going, at about 3500 rpm...power is there an it's driveable... below that rev range...there is less power an it sound like it's not igniting as it should...

i read somewhere, that someone had the exact symptoms on his 190e , an it was a broken wire somewhere in the main wireing harness..

i guess i now need help from you experienced mercedes guys again.

thanks... alex

ok..bad news...after 3 days of enormous work... > took the head off, and discovered just the gasket beeing bad...head and > motorblock surfaces seemed ok > cleaned everything > replaced every piece of faulty rubber hoses and everything needed for gasket > change > i changed the head gasket, and did good work, for what i can tell > i put it all back together....checked everything...did everything by the > book.. > the engine started instantly...but no difference...still rough idle > > even worse...a scratching noise added itself to the fault list :O( > > i checked the chain tensioner...seems ok...what could that bee now? > its not anything connected to the v-belt...took the belt off, but noise > still there. > loosened timingchain tensioner...noise persists... > this noise had been there before...but not this loud... > what could it be now? oil pump? > haven't changed the oil yet...could have gotten some water in it, while > changing the headgasket... > sounds like something is not beeing lubricated as it should > hmm...i dont want so loose this patient... > > thanks for help... > alex

"Alex Hemmerich" schrieb im Newsbeitrag news:bm3387$8u3$ snipped-for-privacy@nets3.rz.RWTH-Aachen.DE...

Hi Guys! > > Thanks for all your thoughts! > Since I ran out of ideas, I had a mercedes mechanic look into it. > They found out, it's the head gasket. > Jepp..although there are none ot the "known" indications, he stayed with > that diagnosis. > They tested everthing else. Ingnition is perfekt, like on a new car, he > said. Electrical is all ok. > Vacuum lines are good to. > Good thing is, since the gasget blew so suddenly, the prognosis is good, and > there is a good chance of not having any cracks in the head. > I started removing the head yesterday and will keep you informed. > I am still fumbling with those annoying rods that hold the guiding rails for > the timing chain.... > but hope to manage... > > Car has 160k miles...should I do the timingchain and tensioner as well? All > of that looks good, so what do you think? > > Thanks! Wish me luck here, guys, this 190 looks so perfekt, it just has to > get back on the road. > > weeping, Alex > > "Alex Hemmerich" schrieb im Newsbeitrag > news:blre1a$hqv$ snipped-for-privacy@nets3.rz.RWTH-Aachen.DE... > > Hi Group! > > > > My 190E 1,8 from 91 "was" running perfect with 160k miles on it UNTIL I > > decided to give it a nice body and engine cleaning. > > > > The engine was cleaned with a high pressure lance. Now it idles rough, > > almost like it was missing a cylinder. > > When letting it rev higher...I runs smoother...but not perfekt. > > After testing, I unscrewed sparkplug of cylinder No. 2 and it was all wet, > > worse then the other 3. > > > > - distributor cap is dry and replaced by a new one > > - the distr. finger is new > > - all 5 wires and plugs are farely new > > - all 4 spark plugs were replaced > > - I checked all 4 plug wires and measured about 1300 ohm an each > > - air intake is clean and filter is clean > > > > with all that replaced...it didn't get any better. > > > > What can it be? Some electrikal Problem maybe, because of the water from > > cleaning or the hard impact with the water jet? > > This accured right after the engine wash, so no sign of malfunktioning > > before. > > Funny thing is, right after the cleaning, I drove a couple of miles, and > it > > was fine...then after a while...it started malfuctioning. > > > > Thanks for any help, since I don't know where to start. I hope it's just > > some kind of sensor, since this happended with the coolant sensor last > time. > > After cleaning the engine, I had to replace the coolant sensor. > > > > Alex > > PS not gonna clean it again :O) but it looks so nice now...like new! > > > > > >

skw11 Signatur-- Alexander M. Hemmerich Sebastian-Kneipp-Weg 11 D-47802 Krefeld Germany Phone: +49 (0) 2151 9661-41 Fax: +49 (0) 2151 9661-40 Mobile: +49 (0) 179 415 3912 eMail: snipped-for-privacy@hemmeri.ch Web:

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Reply to
Alex Hemmerich
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The 190 is prone to bad solder joints. The climate control system is a nightmare. I have a 190D and like it, but repairs can be difficult. do you have all new ignition components? I havent been on this group in a year or two so I dont know your history. KH

Reply to
Kevin in San Diego

OK, I looked up your previous posts. Check all vacuum lines for cracks. Does that thing have a throttle position sensor? KH

Reply to
Kevin in San Diego

Hey, have you been to

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? I just found the place. They arent really that Guru like, but they have some info there. KH

malfunktioning

Reply to
Kevin in San Diego

Hi! Thanks for the comment!

Had compression checked today...about 188 psi (13bar) on each cylinder...almost no difference between the 4 pretty good for 160k miles, right? so my head gasget job was ok i guess... now...I left the car with an independant mercedes mechanic an hope he finds out what my patient has...

in addition I replaced about every temp sensor I could find...got a little better the funny thing is, when the car has been sitting through a cold night...the next mornung it runs pefekt for about 10 minutes...it starts on the first quarter of a crank (and it was no warmer than 30°F last night) then the engine shakes start....that's why I thought of some temp sensors problem....

I checked fuel pump, fuel pump relais and engine control unit...found no bad wires, yet wish me luck here!

my guess would be the EZL ignition unit, right before the distributer...or maybe ignition coil... I'll wait an see what he says...will kepp you informed... if any of you have any additional ideas....I'll appreciate you sharing them. Alex

"Kevin in San Diego" schrieb im Newsbeitrag news:C83jb.77979$gv5.32308@fed1read05...

malfunktioning

Reply to
Alex Hemmerich

Alex Hemmerich wrote: the funny thing is, when the car has been sitting through a cold night...the next mornung it runs pefekt for about 10 minutes...it starts on the first quarter of a crank (and it was no warmer than 30°F last night) then the engine shakes start....that's why I thought of some temp sensors problem.... Just by this problem (not finishing reading all your postings yet), it MAY be an air leak from the intake.  Remember that a cold start has enriched fuel coming in.  When engine warms up, the control unit decides to use normal fuel volume.  However, the air leak causes too much air so the mixture becomes too thin.  To prove this point, you need to fake the temp sensor (there are many and you need to find out exactly which one feeds to the control unit) to make the control unit 'thinks' it's an cold engine.  To find out the air leak, use carburetor cleaner or starting fluid to spray around air passage.  Engine runs well when sucking such fuel, instead of air.  But be careful not to have any spark.  Good luck, and let us know what the answer is.

Reply to
Wan-ning Tan
Reply to
Alex Hemmerich
Reply to
Kevin in San Diego

Hi Guys ...

Got the same problem .... engine stall at low speed or hard braking at lights...

Have this problems for about 6 months and still haven't found a cure for it....

Component Changed New OVP relay New Fuel Pump relay New A/C Relay New Ignition Coil New Idle valve New Fuel Microswitch New Thottle cable New Brake Booster line New Fuel Pump / fillter / Accumlator New Fuel Injector

Any ideas ....

The Bee

190er 1.8 Euro
Reply to
The Bee

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