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

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Question

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 quantities of injector. Place each over a container and

record the of fuel each produces at a amount of time. They be equal.

7. Basic Idle

Check and rest the idle per the It is best to set it when the engine is

Check the co output, also.

8. Leaks:

Inspect all fuel

9. Fuel injector Clogged:

Mercedes-Benz R107

the injectors and inspect for correct Apply power to the fuel

jump the wire terminal 30 and 87a. Caution fuel flow from 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.

Jim

Answer

OK — first sure all adjustments are to spec plug gap, point timimg

then to set idle

height of aairflow sensor — it sould restjust teh upper edge of the airflow venturi

Center the air flow plate

Adjust minimum air warm engine then off, inspect AAV to make it has closed completely

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

setting CO is next — if you have a meter its just a buit remember very adjustments make a big difference

is probalby fuel pump which is OK

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

interesting records



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