I've got an 82 Mercedes with CIS Basic/K-Jet), it doesn't have an O2 sensor or Frequency Valve.

Any how I've been geting pretty crappy Cold Starts over the last few months. Today I finally started running down some troubleshooting suggestions outta my old VW Rabbit Bently. Sure enough Cold start Valve wasn't pumping any fuel (this is while cranking the car over), and then when I hooked up my Multi-meter I didn't get any Voltage outta the plug for the cold start either?

Any ideas?

TIA

What was the coolant temperature? The CS valve is controlled by a "thermo time relay" and I think you need to have a coolant temp of less than 50 degrees for it to activate the valve.

What happens if you disconnect the wire and give it 12V?

Some other stuff to check:

- fuel pressure when cold
- thermo time relay
- coolant sensor (tells relay what the coolant temp is)
- aux air valve
- warm-up compensator (power to it, and resistance across contacts)

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe

I'm also not getting any power to the Thermotime swtich.

I'm guessing that something is going wrong here with the wiring. Any ideas on what to track down????



This thing has been pissing me off for so long now.

I am travelling and don't have a wiring diagram with me.

If memory serves, the relay needs power with key on. Then it gets a signal from start and it fires the valve for the appropriate amount of time depending on coolant temp.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe

Cold start injection HAPPENS only in COLD weather & only when the starter is operating.

IF that car is having cold starting problems then HAVE the system fuel pressures tested...warm-up regulator is a common problem

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Just curious, what is a warm up regulator?

Thanks,

Mike

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra