Question about 1993 Mercedes-Benz 190

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What activates cold start valve, how to check? if its working

After having head repaired (bent exhaust vale in #4cyl, its hard to start, i can squirt petrol in and it runs, only while its being fed with feul, any help?

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  • charles thompson Jan 25, 2013

    i fininally got enough info ,of how to check feul pressure ,it needed pump , thanks for all the help,

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Hi you need to find out if there is fuel getting to the cylinders,take off ht leads so the car wont start then crank it over a few times and pump the exselleration peddle a few times,now pull each spark plug out in turn and check to see if they are wet with fuel,if not you will have to check from petral pump to cylinder where the problem might be,best of luck.

Posted on Jan 05, 2015

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Posted on Jan 02, 2017

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SOURCE: cold start valve problem

if you have an electric cold start valve make sure to unplug it and if keeps apling fuel with electrical conector unpluged that means the valve is not good, but if not then you have an electronic problem, possible a bad cold start sensor or cold start module or cicuit problem, and might be a time to take it to an electrical shop

Posted on Jun 17, 2008

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2 Answers

Blue smoke coming out of the exhaust


start car when engine cold - place some paper in front of exhaust pipe.
If you see dots of oil you have a major engine failure with the lower block of your engine or the rings. This costs a lot of money to fix !
I sent my car to wreckers to be crushed when I had smoke and burning oil smell plus oil when it was cold.

If it is water when engine when engine cold you may have a cracked engine head , cracked head or blown head gasket.
Less expensive to fix but may require head to be re machined if head is warped. If head is cracked then head will need welding.
A cylinder compression test will confirm this type of head problem.

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Whats the worst that could happen if I've adjusted valves incorrectly?


If the valves are too tight, they don't fully close. That can "burn" the valves, causing an expensive repair job to replace the valves. Too loose will make tapping noises and eventually can wear the cam.

Nov 14, 2015 | Cars & Trucks

1 Answer

I own a 1968 Imperial 440 V8. The intake valve push rod of the #1 cylinder bent and was causing knocking noise. I replaced it and the motor ran fine. The #1 cylinder started missing. Again it was a bent...


bent push rods come from improper movement of the rocker and valve
This can be from an incorrect length push rod-- some v8 engines run different lengths for inlet and exhaust
from rocker arm jamming on the shaft or rocker ball
hydraulic cam follower pumping up and jamming the valve spring to a solid block
bent valve stem above the valve guide
valve spring Colette moved or misplaced incorrect rocker for that valve-- some engines run different length rockers for inlet and exhaust
what to do-- if this engine was running all right for some time then the rocker can be omitted. if the problem has been occurring since the cold weather the the oil may be too thick and not allowing the follower to leak down properly
check the follower or replace it , change to a lighter viscosity oil for the duration of the cold weather
unless you have had a recent head change or other mechanical work done the problem will be in those areas.

Feb 21, 2015 | Cars & Trucks

2 Answers

I have no compression in cylinder 1 it has only 15 pd of pressure but it doesn't smoke


Do a cylinder leak down test

Still nothing ,the valves are worn,head comes off

Compression does not tell you if a valve seals properly,
only how much pressure your building at cranking speed

Jul 23, 2014 | Cars & Trucks

1 Answer

Car overheated and car turned off. now it winds but it doesnt turn over?? any safety features activated or what could be the problem


Is it cold now? Overheated could have warped the head but it would still start but run terribly. Check fuel pressure. There may be a little schreader valve (looks like a bike tire valve) on the fuel rail. Turn car on but not start, push little pin in and see if fuel squirts out (use a glove or a stick to keep hands free of fuel) it should squirt out if you have fuel pressure. if no pressure, it may have blown a fuse or pump relay.

Aug 18, 2013 | 2002 Nissan Altima

1 Answer

My 1995 nissan pickup is ticking and smoking from exhaust. Seems that oil is coming out of exhaust. 4cyl. 5-speed. 160k


if its burning oil then you could have a pcv valve problem(plugged) and changing it could fix it.the other things are bad rings,bad valve guides or valve seals.it could also be a cracked head or a bad head gasket leak by the oil drain passages and combustion chamber drawing in oil and burning.the ticking noise is either to thin of oil(dirty) by not changing it frequently low oil level or worn engine components that will need repair.

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Mazda protege 96 very hard to start when cold, once started it will restart for 3 hours. Plugs, wires, gas pump, temp sensor, seem good (Tested with computer). motor definitely gets flooded every time I...


check the mas air flow sensor(is this the 6 cyl) the sensor has a problem with the nose piece inside not moving enough to tell the ecm the propper air flow for the cold start,also check throttle valve for dirt build up around it-if its a four cyl repost

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2 Answers

2000 Ford Focus timing belt failure


If it is the single over head cam (SOHC),chances are you will be o.k.
If it is the dual over head cam (DOHC) , chances are you bent some vales and possible piston damage.
SOHC you can probably do yourself,but the DOHC you need special tools for the set-up of the engine.
Remember to ( after belt is installed ) remove the spark plugs and turn the engine over by hand atleast 2 full turns of the crankshaft.
If while turning by hand the engine stops, you need to reposition the belt on the pulleys. Check the proper diagram, and follow the instructions carefully.
Please rate this.

Jul 19, 2009 | 2000 Ford Focus

1 Answer

Timing belt broke while driving


If a valve was up all of the way (during intake or exhaust) it could have come into contact with the piston crown and bent a valve... Hardly a 'blown motor' though...

Nov 22, 2008 | 1999 Ford Escort

1 Answer

Timing Belt and Intake and Exhaust Valves..


At least engine head must be removed for inspection and repair. When head removed you can estimate also if any damage on pistons top surface.

Jun 25, 2008 | 2004 Hyundai XG350

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