picked one up two days ago- only runs with the air filter unclamped. mass air flow sensor?


Asked by Wolfgangwastl Jul 27, 2013 at 10:24 PM about the Volkswagen Cabriolet

Question type: Maintenance & Repair

8 Answers

Not Active

depending on what year this car is....you need to get a fresh air filter...oil filter too~ perhaps you are suffering from a vacuum leak...the fuel pressure regulator...vacuum source....ambient air sensor IAT and block temp....radiator temp...O2 sensor...THE tps could be issuing errant signals...the ground connection to the battery might have "brown" power~

Hector Irizarry Duval

seems the filter is clogged, id give a full maintenance first...

1 out of 1 people think this is helpful.

1987- I am replacing any rubber under the hood (including vacuum lines) that is dry-rotted/ missing one by one. Also it takes 3 or 4 attempts to start it when cold - which points to the "cold start valve"?.....the problem is for me these parts are too expensive not to be sure about first....however once this baby warms up it is pretty impressive on performance! WOW is it fun to drive! :)

2 out of 2 people think this is helpful.
Hector Irizarry Duval

all the parts for k and ke jetronic injection are expensive. but a well maintained system is very fuel efficient and they have a very good response. the trick is to get to know the system very well since it does not have diagnosis so you have to try the parts the old way. trial and error...

Not Active

ah yes...the thermo-time switch should be examined~

1 out of 1 people think this is helpful.

Thanks for all your help- while I was replacing the dry rotted hoses, etc. I found that the incoming fuel line going to the cold start valve was bent 90 degrees causing what looked like a 99% fuel restriction. I straightened it out, refastened it to the sidewall of the engine compartment and it made a 100% improvement- the car is awesome, I want to post the before pic now for you all and the "after" in a couple months when the restore is finished. I freekin love das auto! Wie fahr'n fahr'n fahr'n auf der Autobahn! :)

Not Active

you really must treat yourself to some silicone vacuum lines....couple of airport cocktails and it's done~

Not Active

that one was from summitracing.com here's one you can buy at advance auto~

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