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Does anyone out there know of a knowledgable fuel injection specialist out there for my 1983 2.0l air cooled vanagon

the problem

1. starts from cold every time without fail - 1 pump on the gas - 1 turn of the key and perfect
2. however........... this generates NO idle - must keep steady on the throttle or she stalls
3. this is the problem - once stalled it is impossible to start. 30 minutes on average of turning over, starts to fire but dies, lots and lots of times
4. When the engine catches and goes all is ok once warmed up. Idle and restarting are ok and running is fine.

this has happpened every time for the last month - until then all ok

with so many sensors and checks required i cant do this myself. I have changed plugs points and leads, there is a good spart and the fuel is getting through - the cold start sensor works fine too

i am at a loss and require a professional! my contatcs so far have drawn a blank

much appreicated

rich

I might be able to help as the fuel injection system is really not complicated. By the sound of things your auxiliary air regulator or hoses are blocked. When the engine is cold it is supposed to be open and allow additional air to the engine for idling. After about 5 min. it should close. The regulator is operated by a bi-metal spring and a heating coil. Either the airway is blocked or the mechanics inside is jammed in the close position. Easy to check by pulling off the hoses and blowing. If the fault was electrical it would stay open all the time.

Reason why you can't restart after stalling is too much petrol and too little air.

ok -
i have removed the air regulator hose and have checked for blockages in hoses and regulator - all are clear.
upon testing by removing the air regulator hose and starting engine there is a good vacuum.

with the air regulator hose removed the engine now starts - with the hose connected the engine doesnt start (as before)

i am now assuming there is not enough air coming from the intake air sensor (the air filter is ok) to the air regulator.

what checks can i make to the intake air sensor to determine if the correct amount of air is going into the regulator?

If the air and spark are there the problem might be with fuel delivery. The cold start valve could be leaking resulting in too rich a mixture. Any smoke or smell of petrol present when starting?

Bentley Section 24 describes how to test the sensors, AFM included.

thanks for the reply

the cold start valve was the 1st thing i checked - no leaks and it works ok and there is no smoke or excessive smell of petrol.

following the checking of the hoses/regulator and cleaning the air filter the van is now starting every time after stalling! but still no idle from cold to stop the stalling

i have noticed the egr valve threaded adjuster rod has been removed and i cant find an oxygen sensor on the exhaust manifold - would i be right in asuming the EGR has been disabled ? (although the Exhaust Gas Recirculation light on the dash does come on) reading through haynes i see the oxygen sensor plays a valid part in the idling. would the sensor be located elsewhere and would this be relevant?

2nd to that i think i need to buy a bentley manual !

According to Bentley oxygen sensor is for California only and EGR valve for rest of USA and Canada. Without a rod your EGR is disabled. Oxygen sensor does not play a role during engine warmup and full throttle.

Since mixture is not rich at cold start, the only other possibility I can think of is that Temp II sensor might be faulty. If this is the case there will not be sufficient enrichment to sustain idling. Temp II should be around 2500 ohm at 20*C and 220 ohm at 80*C.