Vintage Cars 1974 450 SL Idles Low mercedes r107 air intake system

28 Янв 2015 | Author: | No comments yet »
Mercedes-Benz R107

Vintage Cars / 1974 450 SL- Low



QUESTION: the car was idling high (over 15 and then I changed the air slider. For a or two, it was perfect. Then were problems with the wires and the car started to idle low 5 rpm) and hesitated. I replaced all air and hoses. I don’t know could be wrong with it? I ordered a Mercedes R107/W126 control unit. Do you think could help? Any input on how I fix this problem would be Thanks!

ANSWER: I assume is a cold engine issue, the following

Idle Bad with Cold

1. Leaks in air intake system:

all air intake and vacuum connections. Any old must be replaced.

Be sure to the intake boots around the runners. Check all hose

Replace any collapsed hoses.

2. Air Valve does not open:

the hose connections to the valve. If check good remove the and

check for leaks by closing off one end and a small amount of suction to the

other end, if air can be drawn the valve, with the other end off,

replace the valve.

3. Start Valve leaking:

the cold start valve, in front of the intake. Leave the line connected,

If the pressure is not do a complete check of the warm up

5. Injector Leaking:

The opening could be to low, opening should be around 2.5-3.6 bar

PSI). Check all the injectors for of leakage. Test for opening

When you reinstall the injectors be to replace the o-rings.

6. Injected low:

Compare the fuel of each injector. Place injector over a container and

record the amount of fuel produces at a given amount of They should be equal.

7. Idle incorrect:

Check and the idle per the specifications. It is best to set it the engine is warm.

Check the co also.

8. Fuel Leaks:

all fuel connections.

9. Fuel Clogged:

Mercedes-Benz R107

Pull the injectors and for correct operation. Apply to the fuel pump,

jump the terminal numbers 30 and 87a. fuel will flow the injectors

10. Control Plunger in the fuel binding:

Remove the air cleaner and move the plate up and down, do not the plate.

If it binds investigate. If it is not to repair replace the unit.

Dear Ron,

Sorry I was not enough. This problem when the engine is warm and I put it in It goes from 6 or 7 rpm to under 5 The hoses and the accellerator air valve has replaced. Also, there is a noise on the low drivers side Can you help? Any other ideas? imput so far has been great.


OK — first make all adjustments are to spec — gap, point gap,

then to set idle

adjust of aairflow sensor plate it sould restjust below teh edge of the airflow sensor

Center the air flow sensor

Adjust minimum air — engine then shut inspect AAV to make sure it has completely

restart engine close the idle air pass and throttle stop screw so the barely idles — 450-500 RPM then use the manual on the idle air pass to set curb at 950rpm

setting CO is next if you dont have a meter its a guess, buit remember SMALL adjustments make a big

humming is probalby fuel — which is OK

Mercedes-Benz R107
Mercedes-Benz R107
Mercedes-Benz R107
Mercedes-Benz R107


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