88 Cabriolet sputters and dies when engine warms up
Replaced accumulator pump and fuel pump 2 years ago. Just replaced all
injectors, plugs, rotor , distributor cap. Problem seems to be excessive fuel
tank pressure. When car dies, I loosen gas cap, lots of pressure is released,
then car runs normal until pressure builds up again. Replaced gas cap, no
from experience the "thermo-time" switch goes bad with no evidence other then poor performance~ https://www.google.com/? gws_rd=ssl#q=1988+Volkswagen+Cabriolet++thermo-time+switch
this have a Jetronic? those can be sumptin~
Could be a return line or other gas lines- the fuel system is a closed system so it will build up some pressure in the tank as the gas level goes down- the gas tank on older cars has a venting system which would release vapors into the air- but of course, that is not environmentally friendly- hence, the newer systems- when did the problem start? could it be the fuel pump again? good luck-
The problem started after installing a new warm up regulator due to hard starting in winter. Now starts great but...
Also seems to be getting terrible gas mileage
sounds to me like the fuel system is restricted... it sounds like Your regulator is causing to much backup pressure between the engine and the tank which could be why the tank is letting go of a lot of pressure when you release the cap. Either that or a purge valve in the tank is stuck. Its often located in the fuel nozzal going down to the tank.
quite sure yours is a Jetronic...look for tips on how to deal with these~ https://www.google.com/search? q=88+Cabriolet+jetronic&biw=1360&bih=649&tbm=isch&tbo=u&sou rce=univ&sa=X&ved=0ahUKEwjinJC2wJbMAhUG1h4KHV1xCpEQsA QIGw
these links never seem to work...just google 88 VW jetronic and you may find out how to adjust/diagnose~
i hate these systems with a passion.... The horror story of my 1985 audi 5000..... i owned a 1984 modal and the 1990 100 they all ran the same thing and they are finicky as hell! Most comman thing to happen is the seal betwen the air box and the distributor goes bad and causes a bad seal which makes the car run horably... had to fasion myself a crude replacment once to get the stupid car running
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