190e slow to start

[frank133]

Hi,I have been having a annoying problem with my old 190e,its a 1987 2ltr manual done about 175,000 miles,I have owned this car\for 12 years now,and over the years have replaced all the usual parts,
the thing is it takes a bit of turning over only when cold,to start it,then ticks over at 900,it used to tick over at 1100 till it got warm,then drop back to 900 ish.I started by changing the cold start valve.[I have a 1992 190 which I am using for spares,starts first time ] the auxiliary start valve I changed next,then the ecu,the throttle micro switch,checked all vacumm pipes.
I would like to change the idle speed air distributor but the doner car has a circular type dont know if its possible to change the whole thing,also the same with the temp sender ,three wires as apposed to two?
I do intend to change the injection asembly when I have time,it lookes a lot cleaner inside than mine,
its the Bosh jetronic and fuel is getting to all parts under pressure,am I being to fussy over the starting,.I am beginning to think it might be electrical or sensor problem,should there be voltage at the cold start valve with just the ignition on when cold?any ideas much appreciated thanks

 

[Ellsy Tanners]

You may have leaky injectors which are causeing a long cranking period, not to expensive for a euro car parts specialist. You can get them checked but that might cost as much as replacing them!!

 

[frank133]

Hi thanks for that I do get a lot of parts from ECP,dont know why I think its a cold start valve problem,I will change all the injectors from this newer car that I have.and let you know ,its handy having a spare car for spares,I know it is six years newer than mine ,but I have renewed to many parts on my old one,its like an old friend,still looks the part for a twenty year old car,thanks for your reply frank

 

[kth286]

frank133

I too thought the injectors leaking (mechanical types) as they get older.

There is then neat fuel in one or more cylinders.

The cold start injector adds to the problem by injecting even more fuel into cylinders.

So, what you need to do initially is to take electrical plug off the cold start injector to disable it and stop it injecting more fuel.

You could find that helps a great deal and car is likely to start immediately and will prove the theory of the leaking injector/s.

 

[frank133]

Thanks Dave will go and do that now,I did have the same sort of problem a few years ago just cant remember how I fixed it,will get back to you with the result,cheers frank

 

[frank133]

Hi Dave just tried that it was still the same,when I reconnected the cold start valve it did idle just a bit faster.I think it might be best to change the plugs [I did look at them the other day and the color was about right] I will check the timing and the leads.the acceleration is good even when cold it dosnt stall,I have noticed it does seem to labour a bit in fourth doing about 35mph,I dont think I have ever had this engine over three thousand revs it does 75 mph at about 2600 revs, maybe it just needs a Italian tune, up [ red line it in every gear],mabe not? cheers frank

 

[kth286]

frank133

You tried that at 2pm today. Had the car not been started at all today up to that moment ?????????????

 

[frank133]

Sorry I had to go out ,yes the car had not been started,when I removed the cold start valve connection,thats the trouble,I can only find the fault when it is cold,I have now ruled out the cold start valve,after you said disconnect it,because soons I reconnected it the revs rose a bit.what would you think to doing the same to the auxiliary air valve ? I dont think its a serious problem its only something simple,[I hope]cheers frank

 

[frank133]

Hi,just thought I would let you know how the starting was,I did change the throttle switch ,cold start valve,ovp relay,ecu,checked the auxiliary air valve,and all vacumm pipes.no change in the starting,on advice I then changed the injector's spark plugs and the ht leads,the car starts nearly first time now ,so thanks for that.
I think I might change the fuel accumulator when I have time,the reason being when I undone the injector pipes no fuel sprayed out,I would have thought the system would stay pressurised for a long time after shutdown,I have known other 190s to retain fuel pressure at the injectors for weeks,will keep at it till its spot on

 

[alanbp]

It might be the non-return valve at the filter. I remember Car Mechanics magazine talking about this cranking thing in the mornings and it was diagnosed as a N/R valve next the banjo connection. This causes pressure to leak back when the car has been left.

I havn't got round to doing it myself yet but mine sometimes takes its time & intitially runs at lower revs then stabilises at about 900 rpm.

Alan

 

[frank133]

Hi Alen yes I think its in that area,mine does the same as yours ,I did notice a vast improvment after changing plugs,leads,and injectors,I keep putting off getting under the car,after changing the back axel not to long ago,[bit of a mission that job]I mght as well order a new filter and valve,I have never changed the fuel filter so it must be due,cheers frank

 

[DeGriz]

I have the same problem with my 190e, vehicle is fine once its been started but is a bugger to get going in the morning (bit like me I guess )

Have checked the cold start valve and it works am just wondering where the sensor is that causes it to fire? Would it be the sensor thats stuck in the side of the air filter? Coz from what I can see that ones knackered. Any ideas where I can get one from?