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Old 07-17-2003, 09:37 PM
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Join Date: Jul 2003
Posts: 15
w126 280SEL any ideas?

I have a 1985 280SEL W126 and I have done searches on these probs and cant find any real answers!!

The first problem is that when the weather is hot (approx. 90 F), and after idleing in traffic etc for a few minutes (engine at 90 C), if I turn the steering whilst in drive, or even put the a/c on, the engine will cut out due to the really poor idleing when hot.

I never get this problem in winter at all, or when I first start the car up.

I've changed the plugs, distributor cap and arm, ignition leads etc.

If I want to park, or manouver the car at idle speeds, I have to keep one foot on the gas and the other on the brake!!

The second problem I've noticed is that when I'm on the highway, and I take my foot off the gas, a few seconds later I hear a low click sounds a bit like a microswitch type click, but this comes from the engine compartment. The same click is heard when I put my foot back on the gas!?

I tried this when the car is stationary, but there is no click at all, only when the car is moving!!!

Thanks guys for any help!!


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Old 07-17-2003, 11:55 PM
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150

Since you have KE jetronic fuel injection, I would start with checking for vac leaks. All the rubber bits on the hard plastic lines are probably about gone by now, so plan to replace most of them.

Especially check the idle control valve hoses, if they are leaking, you will get idle problems. The ones on my 88 300TE were actually rattling on the barbs, leaked terribly.

The click is probably the idle/ WOT switch. You will need to verify that it works both hot and cold, as the idle mixture and running mixture are different, and the computer may let the mixture go too lean at idle if the switch isn't working properly.

I'd also check the value of the temp sensor (for the fuel injection) as well -- if it is out of spec, you may have improper mixture hot.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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Old 07-18-2003, 06:32 AM
Registered User
Join Date: Jul 2003
Posts: 15

I will check these and see what I find, but I think you maybe right!

Thanks again,


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