Originally Posted by
86gti
The Warm-up-Regulator ......
This thing controls the amount of fuel delivered to the engine during it's warm-up period. The pressure acting upon the top of the control plunger varies depending on the engine temperature and provides an effective method of enrichment.
The control pressure is tapped off from the primary pressure circuit in the metering head's lower chamber through a tiny restrictive hole which gives it the ability to differentiate between the two pressures. A flexible pipe then connects the control plunger gallery to the warm-up-regulator and returns back to the metering head to a connection next to the primary pressure regulator's transfer valve. This valve is in the circuit to close the fuel from the control circuit when the engine is off, avoiding the total loss of system pressure while the engine is stationary.
The internals of the warm-up-regulator are quite simple comprising an inlet and outlet port, a stainless steel shim, a bi-metalic heated strip and a spring.
The input to the warm-up-regulator flows into a small chamber in the top of the unit, its return is through a small drilling and back to the metering head. By controlling this return flow it will cause a change in pressure acting on the top of the control plunger. With a cold engine the flow must be fairly free giving it a lower pressure. This will allow a higher lift of the plunger which in turn will enrich the mixture under these conditions. The free flow is obtained by the internal bi-metalic strip exerting a downward pressure on the spring which decreases the pressure acting upon the shim, this lower force allows the fuel to flow almost uninterrupted.
As the bi-metalic strip is heated, by either it's heater element or natural heat soak from the engine, the downward pressure acting on the spring is gradually decreased, increasing the force of the spring, which in turn increases the control pressure.
Typical cold engine control pressure will be as low as 1.0 bar increasing over approx. 10 minutes to around 3.5 bar. Some warm-up-regulators have a vacuum connection that will sense a drop in vacuum and lower the control pressure during these acceleration periods.
The voltage supply to the regulator is from the fuel pump relay, because if the ignition was on without the engine running, all enrichment would be removed as the bi-metalic strip would be heated prematurely and the driver would not benefit from the cold engine enrichment.
The two pipes that connect to the warm-up-regulator have different sized 'banjo unions' to avoid them being connected incorrectly. The control pressures quoted are as an example only and reference should be made to the technical data as these pressures can be specific to the part number located on the unit's housing.
This unit will have a resistance value of approximately 20 to 26 Ohms.
NOTE :- it is important to disconnect the electrical connection to the unit before any pressure testing on the control circuit is performed as this will prematurely heat the bi-metalic strip and cold control pressures will not be available.
OK, so I've got this issue with my valver: it struggles to start when stone cold (after sitting in the garage overnight), when it does though, it idles smoothly, no issues whatsoever until I take it on the road and occasionally (after only about a 1-2 minute drive, when still cold) it will stall (when coming to a stop/roundabout)? It's not the ISV, as I have given it a very good clean and it is working fine - again the idle is very stable.
I'm thinking it could be the cold start valve (but then after starting and idling ok for a minute or so could it stall because of a faulty CSV?) Doesn't the CSV only assist in starting a cold engine and then become irrelevant once the engine has started?
Could it be the warm-up regulator? Is there anything else that controls the amount of injected fuel during warm-up? I'm thinking the engine is not getting enough fuel when it's cold. Mind you, it runs perfectly fine when warm/hot - starts first time every time, starter motor only needs to turn once and idles very smoothly - it never stalls when warm/hot.
Where is the warm-up regulator located?
Can anyone help, please?
Cheers,
Dom
Last edited by Domel; 19-07-2011 at 01:28 PM.
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