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Not sure if this will help (does the 86 have waterboxer engine?),
My 89 Vanagon has recently started doing the same thing: starts & idles just fine for about 4- 5 mins then sputters & stalls.
I've had stalling issues before and fixed them after lots of internet research: "capacitor fix" for the "Vanagon syndrome" (worked like a charm), holes in rusty exhaust cause O2 sensor to send false info to the car's computer, also broken ground strap or corroded ground wires. As I understand it, all of these things can basically "confuse" the computer & it then creates the wrong fuel/air mix resulting in loss of power & stalling.
But this is a new one to me... I've read that it could be the throttle switch adjustment, the idle valve, or the idle relay (behind the passenger side taillight). But based on the fact that the engine starts immediately, idles perfectly, THEN consistently stalls after about 4 minutes, my best guess is that the temperature sensor under the thermostat (or perhaps another temp. sensor in the engine?!?) is faulty and, again, confusing the computer with conflicting signals. Perhaps it takes 4 minutes for the coolant to reach just the right temperature to cause the sensor to activate.
Not much to go on but I hope this was helpful.
(PS-Anyone else have any ideas?!?!)
What else can I help you with?
Why would a truck stall while driving in the rain and won't trun or crank the motor until a little while later?
Check for loose or corroded battery cables Check for a loose ground cable
Where would I find a diagram for 1986 vw vanagon coolant system?
Volkswagen Vanagon Official Factory Repair Manual Bently Publishers.com
What makes car stall while in gear?
A problem in the fuel line could cause it to stall. On a stick shift, letting off the clutch too soon would cause the vehicle to stall.
Why would your truck stall out when running and giving it a little more gas?
engine stalls at low speed
What would cause 1990 Volvo 740 GL to stall while driving?
There are several things that can cause your 1990 Volvo 740 to stall while driving. The most common cause is a bad fuel pump.
What would cause a 96 Pontiac Bonneville to stall while you are driving?
crankshaft position censor
Where might one find a Volkswagen Vanagon?
There are sites which sell all different types of automobiles in operation, and example would be autotrader. However, the Vanagon actually has it's own website dedicated to it, simply named vanagon. On this site there are links to other pages where people have them for sale.
What would cause a car to suddenly stall while on the freeway?
Running out of gas, timing chain breaks.
What would make a vehicle stall while making a hard right turn?
running out of gas? is it carburated?
Why would your 2001 grand prix gt stall out while driving?
There are several things which could be causing the car to stall out while driving. The most common and least difficult problem is that the spark plugs may need to be changed.
What would cause a Dodge pickup 1500 to lose power while driving?
A dodge pickup 1500 would stall out while driving because of a defective air filter.
Why would your 86 vanagon be running perfectly but revving very hi?
check for vacuum leaks
