still no joy with my 190 please help

[fletch]

I recently purchased a 1 owner 1992 190e with FSH 54,000 on the clock & generally in excellent condition. I bought the car of a dealer having had the car checked out and test driven. The car starts, ticks over & runs perfectly but on occasions & for no apparent reason the car cuts out usually after being kept on the same throttle setting when slowing down to approach a junction etc. The car restarts immediately and runs normally. All guages read as they should. I have taken the car to a local independant specialist & he has been unable to find anything wrong & says the car is excellent. The dealer who has serviced the car for the last 12 years has refused to comment although I note that the fuel pump relay was changed 12,000 miles ago, so this is unlikely to be the problem. When driving the car today it cut out again (and I thought there was the merest hint of of a burning smell). I think I have purchased a "problem motor". Looking through the service history & the money spent on the car I can only assume that the previous owner would have not balked at spending the money to have it sorted (the last service by a non merc garage notes that the throttle body housing was also "cleaned out". Any suggestions about where I go from here would be greatly appreciated. I bought the car as I will be doing some substantial mileage in the near future (Hereford to Edinburgh) and wanted to do the journey in comfort but clearly I can't trust it at the moment. Therefore if I am unable to get it sorted I will need to find an alternative. Therefore if there is anbody who wants to take a flier I would consider selling it or exchanging it for a 2.5 190D, as I say the car with the exception of my earlier comment is in excellent condition & has the following spec. 2 owners FSH. Pearl blue, electic windows front and rear and sunroof all working perfectly. switchable auto - standard & economy, CD player, brand new tyres with the only bodywork fault being the slightest of compressions on the o/s/f front wing.
I intend to take it back to the local independant specialist next week but I think he is running out of ideas

help ! :cry:

 

[guydewdney]

merc automatically switch off the fuel when on the overrun, maybe this is where to start looking?

throttle posistion sensor?

tweak the tickover up slightly?

idle control valve?

guy

 

[fletch]

m190e cutting out

Cheers Guy,

will look into your suggestions, struggling to understand why fault seems so intermittent no identifiable pattern other than when slowing down. reluctant to adjust tickover as it is perfect when stationary & seemingly would run all day sitting on the drive.

 

[guydewdney]

heres a test - put the car in D and turn steering to full lock. does the revs drop much? if so the ICV might be dead. putting on full lock puts more load on the engine, therefore it needs to open the throttle more.

 

[fletch]

Thanks fo the info

Cheers guy,

will try it this morning.

 

[fletch]

Guy,

no appreciable drop in revs at all, remains virtually constant at 700 which I believe is the correct idle speed.

regards

 

[Spike]

There is a very similar thread going on below...
http://forums.mbworld.org/forums/showthread.php?s=&threadid=58350

 

[fletch]

Cheers spike,

have looked at the thread- main difference appears to be that they have problems when cold starting, my problem the opposite seems to only cut when operating temp reached

 

[guydewdney]

very very silly sugegstion....


when decellerating, the engine experiences a back torque from the drivetrain - therefore the engine moves over slightly to the left / right

could this be stretching a wire and making it breakdown?

weak spark = bad coil / ht leads (which get affected by heat)


complete guess here

 

[fletch]

guy,

you never know ! difficult to see how it could be tested. Starting to get that sinking feeling in my stomach. Anybody for a very cheap 190 ? :cry:

 

[guydewdney]

the coil is an easy test - borrow a mates? or test the spark with a cold engine - then do a test with a very hot engine - compare the sparks?

the wire thing i would yank quite hard on all the wires / connectors with the engine running (at your own risk !) wiggle allt he wires?

 

[talbir]

The likely fix is to add a series resistor (300 to 500 ohms) in the lead from the temperature sensor near the back of the head.

Mercedes even has a kit to do this, but it's about £35 ! The resistor can likely be obtained from Maplins for 50p !


Talbir

 

[pentoman]

Fuel pump relay!
Fuel pump relay!
Fuel pump relay!


OK I know you said you've done it, but as it's sooooo common with your exact symptoms, unless you know it's been done and did it with your own hands, I would check it.

Might have been replaced with a second hand one which would simply develop the same problem.


If you're handy you can open it up and resolder the large joints on it for peace of mind, and it's free.

For more info and to know where it is, lots on the forum at http://www.mercedesshop.com about it.[/url]

 

[ken190e2.6]

190e, 1988, 2.6, automatic, stalling problems

I have the exact problems with a 190 that wants to stall at stop lights.

The RPM's can vary up to 1500and then down to 450, when it stalls.
What I do, when it starts the skizzy fritz dance, is to set the park brake and run the engine at 1000 RPM, letting off the brake when the stop light changes. This allows you to prodeed without too many people rolling their eyes at you. :roll:

I bought the car from the mechanic I take the other cars to and he feels rather badly. He would be happy if it would stop completely so he could find the problem.

The car ran well before this nonsence started, so should be fixable.

Go to http://www.mercedesshop.com and go tho the section where Steve Brotherton has his DIY forum "Evaluating Electronic Engine Controls". Steve talks about measuring current between the EHA and OVP components. This sounds like it might have some interaction with the stalling problem.

I am going to talk with my mechanic and will pass along any printable comments.

Cheers........................................Ken Porter

 

[omeiza]

i would suggest u check the fuel pump relay.had the problem before my mechanic simply took out the relay and briged it with a wire.the problem stopped instantly.

 

[p_tarman]

And where would the relay be on a 1985 190e? I have given the car a more complete look over than my doctor would dare try to me, and can't find it..

Mine's stuttering when I hit 65mph. I'm already gonna replace the injectors(kinda nice to have them in excellent shape)...But that relay is being very elusive.

 

[flagstaff]

look behind the battery. there is a plastic cover type thing there, with the relays and ecu behind that.... at least, that's where it is on my car :wink:

 

[p_tarman]

thx.

Anyone know where I can possibly order stainless rocker panels for a 190e also? Right around where the jack goes in the side of the car is rusty a bit. I was gonna either make new panels, or order some, and I kinda prefer not to have to rent a sheetmetal brake that big...lol