20 Most Recent 1989 Mercedes-Benz 190 Questions & Answers

Lambda is a measure of the air fuel ratio and the aim is to have a Lambda of 1, though usually the range of 0.9 to 1.1 is acceptable. A lambda of 1 equates to the ideal air fuel ratio of 14.7 and at 0.4 the mixture would be so weak or lean it is a miracle the engine runs at all.

I suggest you begin by suspecting the device you are using to measure the lambda.

I notice you mention fuel distributor and being able to adjust the fuel. It is clear your car is fitted with a continuous injection system, a comparatively crude system with little or no computer interference. Measuring the lambda is fairly inappropriate as the system was designed to be adjusted by CO content which from memory was 0.5 to 1.5, though it was difficult to persuade well-used models to perform well with a CO level less then 2.5.

A CO level of 2.5 would put your lambda tester off the scale (rich).

As you say everything has been done to the fuel system so you can warrant the fuel pressure is correct and the fuel distributor and injectors are correct for the car. What about the valve and ignition timing? Has the exhaust been checked for obstruction?

I am wondering two things; firstly, are you confusing lambda and CO content and secondly are you sure you are adjusting the amount of fuel that is being injected and not merely adjusting the air screw.

From memory the fuel adjustment uses a long allen key or screwdriver to reach the adjustment that is in a deep recess in the air cleaner/fuel regulator/fuel distributor. See repair manual for details.

1989... | Answered on Feb 04, 2018

Your timing is too far advanced. Loosen the distributor securement bolt and back it off a couple of degrees in timing. It isn't that it has too much compression for the starter, it's just firing way too soon to start and run.

1989... | Answered on Feb 04, 2018

Two types were used .On this engine ,but not both together. One was round wth 4 round contacts inside ,And one that is colured green, i think if i am right .This has two contacts .Both on the top of the block on the inlet side of the head at the back.Removal is just to unscrew to extract it, If your not sure and dont know get firther help .

1989... | Answered on Oct 03, 2016

It could be the fuel pump relay.i had similar thing with an mk2 astra that would cut out then in a short while start again.
Good luck!

1989... | Answered on Sep 07, 2014

You sure its a V6?
The 190E 6cyl was an inline 6 and no I'm not aware of them having a chip. None of my 190E's or the 300E had a chip in the key. Not even my 92 S320

1989... | Answered on Nov 09, 2013

No, Mercedes 1989 model does not have chip. We have made a key for E Class and even made a video for it...

1989... | Answered on Nov 02, 2013


1989... | Answered on Oct 31, 2013

most of them are 60 liters

1989... | Answered on Aug 24, 2013

where is the transmission dipstick on a 2009 mercedes benz ml350

1989... | Answered on Apr 20, 2013

That will be the item that has the high tension leads going to the spark plugs. If you have to ask it may mean that you don't have one as the coils or attached directly on to the plugs and the cpu does the distributing

1989... | Answered on Mar 30, 2013


Your best to remove the injectors & mail
them away to be Ultra Sonically Cleaned

You could have them cleaned at a repair shop
with special equipment

Adding something to fuel tank, is too diluted to do
anything but take your money

1989... | Answered on Feb 18, 2013

what you hear is the horn relay which tells me that the fuse,wiring,horn pad,and relay is good.thus the horn itself is no good and needs replacing.

1989... | Answered on Jan 21, 2013

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

114 questions posted

Ask a Question

Usually answered in minutes!

Popular Products

Top Mercedes-Benz Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers


Level 3 Expert

85239 Answers


Level 2 Expert

178 Answers

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

Answer questions

Manuals & User Guides

View Most Popular

190-Class Mercedes-Benz

  • 190-Class Mercedes-Benz

Most Popular Question

show me video remove replace coolant

  • Cars & Trucks