W126, BENZ AID - COMMON QUESTIONS AND ANSWERS

A/C doesn't work, the DEF is the only switch that works, used a jumper wire & started the compressor, works fine. There is no power at the switches on the dryer & no power at the switches on the CC console, also, the vacuum hose that goes into the 6 point distributor does not hold vacuum, what are some things I can check before taking drastic measures.

I could really use some help with this one. I own a 93 500sl with ~84,000 miles. Last summer and this spring I have noticed a very slight missing that occurs is noticiable at any constant engine RPM or road speed. The missing is very short lived, just feels like a little tug backwards. Most of the time it doesn't even show up on the tach - other times I believe I can catch a fleeting every so slight dip in RPMs. It can occur when the car is hot or when cold. It can occur when the weather is hot or cold. It can occur if the gas tank is full or near empty.

I've seen this question on here before. But I never saw the fix. I turn on my AC or heater on low fan speed it works just fine. But if your hot or cold and turn the fan to high speed it runs fine for abuot three mins.Then it's off for about 1 min. on for 5 secs. off for 5 secs. it dose this for about 5 mins. then it will run for about 1 1/2 mins. and starts this all over again. It also dose a screeching sound under the dash on and off too with the no and off. Is there a hight limit on the fan or somthing? Thank for any help the weather is starting to heat up

I have an '87 300DT sedan, 603.960 engine, 143500 miles. Reading thru my electronic copy of the W124 Service Library concerning the fuel primer pump, it lists the minimum pressures it should be able to achieve at idle and at a certain rpm. Measured at the supply line between the cartridge fuel filter and the inlet to the injection pump, doing the conversion from bar to psi, it looks to indicate that the primer pump should obtain a minimum pressure of 4 1/2 psi at idle. I have an underhood fuel pressure gauge installed (Mr Gasket 15 psi from Advance Auto) in the line specified in the FSM. Initially idling cold, it registers 6 psi. After driving 20 miles to work, idling when hot it registers 5 psi.