Question about Mercedes-Benz 300-Class

2 Answers

I have a 1991 300E Benz, automatic tranny. when the engine is cold the engine turns but does not start emmadiately it will take a few tries and it seems the engine splutters for few seconds and when it worms up it seems the ideling is low. complete tune up was done, oxy sensor was replaced but the problem still there. thanks for your help.

Posted by on

2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Got same car same problem solved with an ovp relay repair (see you tube). Raymen

Posted on Sep 10, 2013

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 784 Answers

When it is cold in the morning, the cold start valve will be opened to give extra fuel to help the start. If it is not opened then it would take longer to start. The cold start gets the feedback from a thermal sensor at the top engine block. Check out this sensor. When it is bad it would tell ECM that engine is warm so the cold start valve is not open. The sensor is cheaper than the cold start valve. The idle spec is 750RPM but I think it is high and wasting fuel. Mine is 600 RPM and its idle is smooth so I wouldn't worry about it is low, as long as it is not hesitating.

Posted on Oct 04, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Wining sound when starting but when engine warms up it stops


This has so many variables...is the serpentine belt the original? It can be hardened with age, quiets when warmed up...could be tensioner pulley, this noise could come and go however...also is your weather very cold? If equipped with an automatic transmission, the age can exhibit unique cold sounds...if tranny never serviced, add a bottle of Lucas Oil Transmission Stabilizer to tranny fluid...read instructions, you do not have to drain anything...This is highly recommended for cleaning tranny. Hope this helps.

Mar 26, 2014 | 1999 Isuzu Rodeo

1 Answer

2001 celica gt Hatch has a whining sound. 10,2000 miles(.Tran Fluid is up but dark with a barely red color.) When its warming up I hear a new whining sound. The car is a combo standard and automatic. ...


trans will raise line pressure when cold that will cause hydraulic pump to scream causing that noise, so check your temperature gage and t-stat to make sure its getting up to temperature has intended by manufacture a cold engine will hold gears longer and at hi press until working temp is reached. good luck.

Mar 23, 2017 | Toyota Celica Cars & Trucks

1 Answer

How do I check tranny fluid on 2001 grand am se 2.4 whith auto tranny


Find the dip stick that leads to the transmission. Your car must be started to check the level. There usually is a cold and hot safe area. If you just started it use the cold. If you are checking it after you have driven it for a few miles and then engine is warm check it on the hot area.

Nov 16, 2010 | 2001 Pontiac Grand Am SE

1 Answer

89 Jeep Cherokee Pioneer w/AT4 auto tranny behind 4.0 engine. When cold, tranny works fine, but after 2 to 4 miles, won't engage in any gear manually or automatically, and won't engage in 4WD. After...


This sounds like all checks have been done, the oil is fine and the linkage is good, soory to say your trany is in need of a rebuild, sounds like in internal leak or weak pump, i would have a trany shop check it but i can tell you there going to say it news rebuilding. good luck.

Nov 07, 2010 | 1989 Jeep Cherokee

1 Answer

The car will turn over and some times it wil start and some times it just turns overI and will not start.It has been to the dealer and they did not find what was wrong. The seat seems to work after he set...


If the car starts and runs fine when you first start it in the morning or when its cold from sitting for a few hours after driving it but won't start if you drive it somewhere and get the car upto operating temp and then shut the car off and try to restart it with a few mins or upto a half hour basically when the car is hot then you might be looking at a bad crankshaft position sensor. A bad crankshaft position sensor can keep the car from starting mostly when its hot. If the engine control module doesn't see that signal it doesn't know the engine is running so it never sends fuel to the injectors.

Oct 04, 2010 | 2001 Mercedes-Benz C-Class

1 Answer

Hi I have a 1998 C180 1799cc automatic. Sometimes it is difficult to start. turns but will not start. need to give a little pedal but shouldnt have to according to manual. Seems to start without problem...


You have no problem with cold start it means your cold start valve is working. However the cold start valve is controlled by the signal from ECU. If it sees temperatre sensor reported that weather is hot, it won't release a signal to turn on the cold start valve. Your case is that it turns on anyway- Why do I know? The engine only run if you have a correct air/ gas at ratio 14.6. Since cold start giving the spray when not needed makes the mixture rich, so by depressing pedal a little it opens the throttle body so more air could go in to mix the right air /gas ratio making engine starts. Try to look for temp sensor and test them according to your service spec, it it is not matching then replace them. Some people think that the time to gather Resistance spec for these sensors is more valuable then just buy new ones to replace. But every one has a different approach, you do whatever you are comfortable with. Good luck on the finding.

Jul 14, 2009 | 1998 Mercedes-Benz C-Class

2 Answers

Feels like the rear wheels are slipping around 55mph


do you have a posi rear differinal .if so maybe the clutch pack is slipping and if thats it try replacing the oil with a clutch pack oil used on posi rear ends

Jun 22, 2009 | 2001 Ford F150 Styleside SuperCrew

1 Answer

Automatic gear shifter has become stiff - harder to move


put the car on jackstands or drive it onto ramps, take som carb cleaner/engine degreaser and spray the the little linkage on the side of your tranny, then work it through the gears, don't start it, just turn the key ot the first notch and put your parking brake on, try this process a few times, if this doesn't help there may be bigger problems.

Mar 12, 2009 | 1992 Ford Mustang

2 Answers

Automatic Transmission shifts late and rough after warm


Try servicing the tranny fluid if not changing the fluid, if the problem has existed too long it may be time for a new tranny.

Feb 12, 2009 | 1995 Chevrolet Caprice Classic

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

187 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercedes-Benz Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

yadayada
yadayada

Level 3 Expert

74945 Answers

Michael Contreras
Michael Contreras

Level 2 Expert

166 Answers

Are you a Mercedes-Benz Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...