How does the cold start valve work in a Mercedes Benz?
When the cold start valve opens, the pressure above the control plunger is reduced. This also enriches the mixture from the main fuel injectors because the plunger can move farther for the same air flow, allowing the air flow plate to displace farther, and allowing more fuel to flow from the main injectors for the same airflow.
What causes rough idle in Bosch D Jetronic?
Cold start injector is dependent of this component. The movement of the control plunger will be limited if the cold control pressure is too high.This in turn will limit the amount of fuel able to be delivered through the injectors.The result will be a lean ratio and will cause rough idle.
How does the idle control valve work on a Mercedes Benz?
For CIS-E cars, the CIS-E controller operates the idle control valve and adjusts the mixture based on its coolant temperature sensor input.
What happens when cold start injector goes bad?
A leaky cold start injector may result in a reduction in engine performance and acceleration as a result of the disturbed air fuel ratio. In more severe cases, where a large amount of fuel is leaking into the manifold the vehicle may even experience stalling or misfires.
When the cold start valve opens, the pressure above the control plunger is reduced. This also enriches the mixture from the main fuel injectors because the plunger can move farther for the same air flow, allowing the air flow plate to displace farther, and allowing more fuel to flow from the main injectors for the same airflow.
For CIS-E cars, the CIS-E controller operates the idle control valve and adjusts the mixture based on its coolant temperature sensor input.
How does a VW CIS-E cold start valve work?
The late VW CIS-E cars used a “hot pulse relay” to provide a second ground path and pulse the thing with about a 10% duty cycle at a slow rate (two or so pulses per second) when the engine was hot.
The late VW CIS-E cars used a “hot pulse relay” to provide a second ground path and pulse the thing with about a 10% duty cycle at a slow rate (two or so pulses per second) when the engine was hot.
Is it safe to remove cold start valve?
In answer to your question @irozen77 the valve (injector) itself could just be faulty and be leaking fuel. It’s really easy to remove and test it but be safe with the risk of fire obviously. You can remove it and position it into a large clear plastic bottle to see how it behaves.
How does the cold start valve work on a Mercedes M103?
On the M103 intake, the cold start valve will really flood the middle cylinders while leaving the outer cylinders excessively lean at higher engine speeds and higher loads. Because of this, firing the cold start valve for fuel enrichment in a forced induction engine isn’t really the best strategy.
Where does the cold start valve come from?
If you look closely at the fuel dizzy, you’ll see that the connection to the cold start valve comes from the top of the fuel distributor. Specifically, it comes from above the control plunger (in the same area that the “control pressure regulator” on basic CIS and CIS-Lambda systems is connected).
What should I do if my Mercedes Benz won’t start?
Start the car and you should be able to get around 60 psi. When the engine is running and when you turn off the engine the pressure should stay steady. Always perform this test on a cold engine. Next, make sure that the fuel injector connections are secure and not loose. Check the fuel pump and the fuel pump relay.
Why does my Mercedes not start when I charge the battery?
This Mercedes-Benz is not starting because of a low battery. In this case, what you need to do is trickle charge your battery using any of these 12 volt battery trickle chargers. If you need help read this article on How to charge a Mercedes-Benz the right way. Mercedes won’t start, and it’s not the battery.
Why is there no voltage to the cold start valve?
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? What was the coolant temperature?
Where is the thermo time switch on a Mercedes Benz?
The thermo time switch, 2 pole green coloured device, only exists on the straight 6 m103 and early M117 V8s (pre 88). Post 87 and later m117’s, plus m119’s have a black4-pole temp sensor, with two resistors controlling fuel and ignition signals. The geen sensor is engine temprature sensor two pole contact sits on the back of the engine .
What kind of system does a Mercedes 190 have?
Anti-Lock Brake System, Backup Lamps, Center Console, Cruise Control Gauges, Stop Lamps, Warning Indicators (fuel reserve light, brakepads wear light, brake liquid level light, handbrake), Electromagnetic Automatic Box Valve
What are the symptoms of a bad cold start injector?
$0.00 1 Hard Starting One of the first symptoms typically associated with a bad cold start injector is a problem starting the… 2 Decrease in MPG A decrease in fuel efficiency is another symptom of a bad or failing or failing cold start injector. 3 Engine performance issues More
What do you call the cold start valve?
The cold start injector, also referred to as the cold start valve, is an engine management component found on many road going vehicles.
In answer to your question @irozen77 the valve (injector) itself could just be faulty and be leaking fuel. It’s really easy to remove and test it but be safe with the risk of fire obviously. You can remove it and position it into a large clear plastic bottle to see how it behaves.