Jetta 1.6 carb blurps when ignition off

Imotions
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Jetta 1.6 carb blurps when ignition off

Postby Imotions » Mon Jan 22, 2018 8:15 am

Hi guys
Not sure if blurp is the right word
My issue is when driving and car at normal temp the idle is high like 1200rpm how do i get it back down? Base plate fine vacuums seem fine
Also when driving for a while and i switch the car off the carb like still has life where it wants to start again then switches off..like it just get a last breath and switches off


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Re: Jetta 1.6 carb blurps when ignition off

Postby VAG Fan » Mon Jan 22, 2018 11:50 am

This "overrun" or "after-run" (trying to translate from German here) tends to happen if the idle cut-off solenoid valve is not working properly. The carburetor still aspirates fuel, which then ignites (detonates) on glowing residues in the combustion chambers.

Does the carb have an automatic or manual choke? I'm wondering whether the choke is not fully opened, causing the high idle and the after-run.
Mark R.
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1992 Audi 500 SE, type C4, AAR, 335k (2001-current)
1990 VW Fox, type 16, HM, 245k (2005-current)
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Previous:
1978 Audi 100 GLS 5E, type 43, WC (1991-92)
1983 VW Golf GTS, type 17, FR (1992-2005 but still in the family)
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Re: Jetta 1.6 carb blurps when ignition off

Postby panic-mechanic » Mon Jan 22, 2018 12:32 pm

Yup stuck choke or cutoff solenoid not working.
If the choke is not closed then adjust the idle screw down to the rpm drop.
Stephan van Tonder - Jhb - Putfontein Benoni
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Imotions
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Re: Jetta 1.6 carb blurps when ignition off

Postby Imotions » Mon Jan 22, 2018 1:14 pm

Its a manual chokethe one you pull in the car...
This happened only after i serviced the car regular oil plugs filter service the car never want to idle i seen somehow that solonoid thing at the back of the carb with a yellow wire running to the coil was loose off the carb so i tightened it but the car still never idle the air screw i think its called was closed so i opened it a bit and it idled but idling high and started doing this when switching the engine off


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Imotions
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Re: Jetta 1.6 carb blurps when ignition off

Postby Imotions » Mon Jan 22, 2018 1:16 pm

panic-mechanic wrote:Yup stuck choke or cutoff solenoid not working.
If the choke is not closed then adjust the idle screw down to the rpm drop.
If i try adjust that idle screw it either goes too high or low that it cuts off doesn't matter whether engine is cold warm or hot


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Re: Jetta 1.6 carb blurps when ignition off

Postby panic-mechanic » Mon Jan 22, 2018 1:20 pm

Check the power to that wire and makes sure the earth from the carb to the tappet cover is in place. if in doubt remove the cutoff solenoid and hold it against the engine - let somebody operate the key on/off and see that it moves.
Also try some punctuation in you sentences.
Stephan van Tonder - Jhb - Putfontein Benoni
'07 Audi S6 V10 - beast !!!!!
'05 Audi A6 3.0L TDI Avant
'07 Audi A4 2l TDI
'95 Audi 90 coupe quattro
'13 VW CC 2l tdi (repair project)
'05 Touareg v10

Perfect Power dealer. I do dyno tuning.

Imotions
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Posts: 478
Joined: Mon Feb 25, 2013 9:42 am
Car Make: VW
Car Model: MK2 CSL
Location: Florida

Re: Jetta 1.6 carb blurps when ignition off

Postby Imotions » Mon Jan 22, 2018 4:52 pm

panic-mechanic wrote:Check the power to that wire and makes sure the earth from the carb to the tappet cover is in place. if in doubt remove the cutoff solenoid and hold it against the engine - let somebody operate the key on/off and see that it moves.
Also try some punctuation in you sentences.
Ohk
The solenoid clicks if the key is on and i play with it at the coil.
The ground to the tappet cover is on securely.
I will remove and see if the solenoid moves


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