Skip the auto shop - Our mechanics make house calls

Q: Down one chamber

asked by on

Car stopped running the weeks ago while on the road and wouldn't start, I replaced the fuel filters and injectors but when I start I've lost one cylander (also before replacing injectors I was down one chamber but could start) I've also noticed I'm running too much oil (my mistake not a symptom) how can I get it going again? I presume it's electrical/glow plug related

My car has 200000 miles.
My car has an automatic transmission.

A: I owned a 300D and 300SD, both 1983's. ...

I owned a 300D and 300SD, both 1983's. You can have a bad glow plug or two even if the glow plug light is lighting when you turn the key on. The easiest way to determine if a glow plug is bad is to ohm test the circuit. The relay is a large black box located behind the drivers side headlight. There is a large red (power) wire and two plug connectors. Also, there is a metal strip held in place by two screws. That is actually a strip fuse. If it's cracked or broken, replace it. Do not simply substitute a piece of metal!

Unplug the larger of the two plug connectors. That goes to the glow plugs. You will need a multi-meter set to ohms. Connect the negative from the multi-meter to the battery. Probe each wire in the connector with the positive wire. A good glow plug will read anywhere around 1 ohm. Anything substantially higher than that indicates either a broken wire or bad glow plug. Bad glow plugs are much more common.

If you are still not getting fuel in one cylinder then crack each injector loose one at a time. Whichever cylinder has little or no effect on the idle quality, is the one not getting enough fuel. You can pull the check valve on the injector pump for that cylinder to make sure the piston is moving up and down. If it is, then there may be a blockage in that fuel line.

If you'd like a fresh pair of eyes on this, consider YourMechanic, as a certified technician can come to you and diagnose the starting and cylinder issue firsthand. They can then suggest an accurate fix from there. Best of luck.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: ABS & SRS lights on; car shifts hard and shudders

Hi there. These repairs that were done are fairly normal for this vehicle. It is very common for this car to have issues with these systems with age. I am actually a little surprised that there were not more issues...

Q: Brakes and gas pedal 1979 GMC C1500

Hello - I would first check the throttle return spring at the carburetor - to make sure it's still there, and connected properly so that the throttle default position is "closed". Then check to see if the linkage back to...

Q: Lights and gauges quit working, buzzing noise

Hey there, I would start by testing the fuses. This is a common problem on this generation of Mercedes diesels. There is an OVP relay that sits behind the battery which are also a known source of problems. I would...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...