Question about Volkswagen Cabriolet

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1990 vw cabriolet. after start it wants to die. after being on the highway for awhile it will seem to run pretty well, then it may go into this jerky kinda action, hesitancy, then be fine again. Then, at a stop sign, it will stall completely and then not want to start again! Then finally after 10 minutes of waiting, I crank it and have the clutch depressed completely and put put pUT PUT, it will start (barely) and not want to stay running so i keep my foot on the gas for awhile then take off. It runs so crappy. WE cannot figure out what it is. WE have changed both fuel pumps. It has a new starter, new alternator and battery. New wires and dist. cap. Help! Please

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  • fruitrugs Oct 07, 2009

    All filters are clean.. The mechanic says to tell you that it seems starved for oxygen. When he squeezes on the air hose it runs better, could it still be that sensor? The problem is focused in on the stalling and bad start problem. Are you a vw mechanic???

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Do the following procedure and it will clear up the problem. I wrote this and developed it over 30 years of Bosch fuel injection repairs for this and other problems.
Here are the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.


Posted on Oct 07, 2009

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  • Master
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Check and replace the fuel filter as needed - or if all is OK, replace crankshaft position (engine speed) sensor.

Posted on Oct 07, 2009

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