Found Why My Mk1 VW Cabriolet Wouldn't Idle Correctly

My 1988 VW Cabriolet is not idling properly. As I systematically troubleshoot the vehicle I found a loose ground (or earth) connection. While troubleshooting a Bosch CIS fuel-injected vehicle, it is critical to first address any vacuum leaks or loose grounds!

[@nassimkoubeissi5814]

this called the fifth injector it sprays fuel directly in the manifold

[@DB19736]

Well I guess if you would’ve found that first we wouldn’t have had all these helpful videos! Lol.!Nice job finding the problem👍

[@gerardorodriguez2282]

Mine has the same problemis a 90 model,but has a relenti valve I think in the place of these 2 , after checking the relenti valve cable has no signals i checked the cable to computer and is alright! Any ideas?

[@thomassiever8342]

After looking at mine again I am pretty sure the white solenoid boosts the idle when the AC is on and the black one is for normal idle boost when RPM drops below 750. I was wrong in my earlier comment. I retested mine and the black valve is dead, the white works if I connect a 9v battery to it... but the AC doesn't.

[@urqua495]

Also, very nice retrofit oil cap ))

[@thomassiever8342]

I have a similar cold idle issue and after taking apart those idle boost valves and testing with a 9v battery I found the white solenoid was dead, but the black one works. Those are not easy to find, not for cheap anyway.

[@mastermoi]

Could you tell me where the other wire is going to? The green one... its broken on mine and can't for the life of me find where it goes... back in the days i deleted the a/c so i tought it was related when i saw it hanging the other day...

[@rdperformance8697]

I have a problem with high idle RPM s I can't adjust leas than 1300 RPMs. adjusting the throttle screw, what do you recommed me to do? Regards (same engine), Regards

[@aidantaylor117]

mine runs and starts but it struggles. and if i give it a little gas but suddenly stop like at a red light about to turn right or stop sign being behind people the car turns off

[@A61CORDE]

Excúseme for asking this within this video, since trying to fix the idle.

[@urqua495]

Headlights are great and gloss ))

[@urqua495]

And i suggest to use brake cleaner for the testing vacuum leaks. Not carb cleaner.

[@simonkashindi9798]

Is that a carburetor or fuel injection jive?

[@dougbaker9894]

I have a original 86 should I rebuild or go new

[@elinzmeyer3550]

Candy apple red valve cover. I assume you are backing out of your parent's garage. Good video.