Found Why My Mk1 VW Cabriolet Wouldn't Idle Correctly

[@nassimkoubeissi5814]

this called the fifth injector it sprays fuel directly in the manifold (bypassing the fuel head regulator ) so the engine starts correctly and smoothly it's controlled by a thermo switch located on the water coolant flange that goes from engine to the radiator (upper thick hose ) it only works for 1second then off depending on coolant temp . been long time since I used the kjetronic fuel system and it's amazing performance ,engine noises where awsome in addition to unsuspected faults making every gti owner scratch Thier heads trying to solve those faults . 👋👋

[@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.

[@ShinyFastLoud]

I lucked out and found a NOS set of valves.

[@jhartwells]

@@ShinyFastLoud i am on the hunt for those now :(

[@ShinyFastLoud]

@@jhartwells good luck

[@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?

[@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...

[@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.

[@ShinyFastLoud]

thank you for the update

[@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

[@ShinyFastLoud]

Check everything else, start with eliminating vaccum leaks, then set timing and air fuel mixture.

[@A61CORDE]

Excúseme for asking this within this video, since trying to fix the idle. But I found that my car is leaking gas under the car closed to the gas pump and I found this set screw that for a long time has been there now is loose And I just want an advice . I should buy a new filter , but why there is a set screw in there or purpose. ?how can I sent you a picture for your advise.

[@ShinyFastLoud]

email the pics to me at [e-mail]

[@TheEntertainmentInc]

Me too!

[@thisis4ever1]

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

[@ShinyFastLoud]

I have a couple other videos on how to set the Air/Fuel Mixture and to test the fuel pressure.

[@urqua495]

Also, very nice retrofit oil cap ))

[@ShinyFastLoud]

Glad you like it!

[@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👍

[@ShinyFastLoud]

I would have done them anyway. I'm systematically going through everything on the cabriolet.

[@DB19736]

@@ShinyFastLoud Your videos have been very helpful for me. I have been chasing a rough cold idle for some time and I think I finally got it. But man if they could all be fixed as easy as a bad ground we would all be in business.No computers to tell us whats ailing our mk1s just good ol fashioned process of elimination👍

[@simonkashindi9798]

Is that a carburetor or fuel injection jive?

[@ShinyFastLoud]

it is fuel injected.

[@dougbaker9894]

I have a original 86 should I rebuild or go new

[@ShinyFastLoud]

Rebuild what specifically?

[@dougbaker9894]

Full motor rebuilt

[@dougbaker9894]

All OG 86 cabriolet

[@urqua495]

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

[@ShinyFastLoud]

Brake cleaner works but can cause other problems since it typically isn't safe with neoprene, vinyl, rubber, seals, and gaskets.

[@urqua495]

Headlights are great and gloss ))

[@ShinyFastLoud]

I think so too!

[@bultacotrial290]

Hello! Thank you for the video. Where did you bought the 4 headlights. They look modern and cool. Thanks

[@elinzmeyer3550]

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

[@ShinyFastLoud]

Nope, my house.

[@asvardfjelstad5095]

Not everyone is poor and impoverished like you bud lmao