W124

'87 300DT - When To Replace Primer Pump?

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.

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W124

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Door Locks 93 300D 2.5

After locking my doors with the key all four lock knobs pop open on there own after about 45-60 sec. I can hear a wirring sound comming from the back seat. I am assuming I have a vacuum leak somewhere or a malfunctioned pump under the back seat. Could the door vacuum actuators be faulty? I am trying to keep this simple at first before I need to take the door panels off. Thanks for your help Mike Stillwater, Minnesota

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W124

'87 300DT with coolant, oil pressure, and fuel guage malfunction

Hi: I have an '87 300DT with the 124 chassis. Has been running fine. The problem: the gauges for the coolant, oil pressure, and fuel all dropped to zero. The combination relay (part 201 821 00 47) is vibrating and making noise. Replaced the relay with the identical part with no improvement. Fuses are all good. I am about to test the sender units for the above guages. Any ideas? Thanks much, Pat

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W124

Miracle Paint and a Leaking Radiator

Total KUDOs to the makers of "Miracle Paint"!!!! I went through 2 separate kits of plastic repair stuff on my radiator at the radiator neck. The last person to replace the hose cracked the radiator by pulling side-to-side on the hose. Now I have a seam crack 3" down the side of the plastic housing, and at the inside of the elbow. I decided to try the "Miracle Paint" with the standard fiberglass cloth. - put one coat of paint on the crack + 1" either side of the crack, - allow it to sit 15 minutes, - apply the fiberglass cloth, press it down so that it is tight against the crack and surrounding area, and - apply another coat of "Miracle Paint". - Let it dry overnight - Apply a 3rd and 4th coat of paint and let this dry 12-24 hours between coats.

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W124

124 300TE instrument warning lights sometimes flicker while engine is running.

'89 124 wagon, 300TE, instrument cluster warning lights come on dimmly then go off. Sometimes go off when engine is rev'd up. Slightly moving the ignition switch has no effect. Engine remains running smoothly and alternator light is on at the same low intensity as the others. HELP

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W124

Cruise control erratic

I have a 90 300d. My cruise control is being very erratic. I will click set, and then it accelerates probably at least 5 mph faster than i set it and then it shuts it off and then back on, and then back off and on etc. Has any body had this happened? I am lost at where to start. I have a alldata manual on it but its not much help. Is there some sort of adjustment with it? Thanks Jerritt

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