Cutting Out

Carbs; K-jet; Tanks; Lines; Filler necks, Senders; aftermarket fuel systems; Exhausts and Manifolds;air filters - standard and aftermarket

Moderator: Scirocco Register

Forum rules
Hints, tips and guides for repair and modification - the FAQ section on the main website is worth checking first for information relating to common faults and technical help. Useful posts and guides will be added to the FAQ http://www.sciroccoregister.co.uk/scirocco-faq
User avatar
scrumpyone
Posts: 434
Joined: Wed Mar 23, 2011 2:32 pm
fill in the right answer: 10
Location: Castle Cary, Somerset

Cutting Out

Post by scrumpyone » Tue Apr 27, 2021 10:28 am

Getting desperate on this.

My commute is now further & uses the very busy A37. Ever since this I have had issues with the revs dropping off, the car stuttering & eventually stalling at lights or junctions. It generally starts to happen about 7 miles into the journey & is usually apparent after I've been travelling uphill behind slow moving traffic. The car starts first time afterwards, although I made the mistake of giving it some choke a few times which just flooded it & made things worse.
It's a GT2 with Weber carb. So far my mechanic has cleaned out, reset & retuned the carb (twice), replaced rotor arm, fitted new fuel pump. I replaced the filler neck, tank & fuel lines about 7 years ago.
Any advice or help please :dunno:


Dave

Register No:1110
'79 MK1 GLS (R.I.P.)
'91 MK2 GT2 (alive & kicking)

mark1gls
Posts: 3582
Joined: Thu Apr 02, 2009 9:28 pm
fill in the right answer: 10
Location: Somerset

Re: Cutting Out

Post by mark1gls » Tue Apr 27, 2021 9:10 pm

You could try a restrict the fuel return pipe to see if that helps or short term test, remove the fuel return pipe and block it off.

Have a google on the web as it seems to be a common problem with a Webber fitted and same for Mk1 golfs..


Mk1 78 Scirocco GLS 1.6 FR, weekend toy.
Mk1 88 Golf GTi cabriolet 1.8 DX. Daily drive.
Membership No. 323

User avatar
scrumpyone
Posts: 434
Joined: Wed Mar 23, 2011 2:32 pm
fill in the right answer: 10
Location: Castle Cary, Somerset

Re: Cutting Out

Post by scrumpyone » Thu Apr 29, 2021 1:29 pm

Thanks Mark,

Update - secured a cable tie around the fuel return line. This helped with stopping her from stalling at lights/junctions. Still jumping/missing whilst driving though. Driving uphill has improved.

Any more ideas?


Dave

Register No:1110
'79 MK1 GLS (R.I.P.)
'91 MK2 GT2 (alive & kicking)

User avatar
whiteshark
Posts: 460
Joined: Thu Apr 02, 2009 11:15 pm
fill in the right answer: 10
Location: Belfast

Re: Cutting Out

Post by whiteshark » Fri Apr 30, 2021 1:15 am

Check your HT Leads for arcing at night, check the gasket behind the fuel pump as well. These can deteriorate and cause small leaks resulting in lack of fuel or air leaks, not enough fuel due to small fuel leak. Feel your pain, Webbers are fun, you always get home but the start stop , restart is a pain in the !!!! if your car is having issues. Been there and got the t-shirt. As you have replaced the dreaded filler neck, fuel lines, check the sender in the tank. Is the gauged bit in the sender in the tank still working or does it need cut out a bit to allow more fuel to come through. Good luck. All my cars are now injection, but I always thought that the acceleration from 0-60 with a Webber Carb on a Scirocco when set up correctly was awesome!!



RussGLAuto
Posts: 111
Joined: Sat Jul 14, 2018 11:51 pm
fill in the right answer: 15
Location: Spalding

Re: Cutting Out

Post by RussGLAuto » Sat May 01, 2021 10:03 pm

I understood you changed your fuel tank and lines several years ago.

What does your engine bay fuel filter tell you? Any particles on inspection?


Daily Driver - 2017 Volvo XC90 T8 Twin Engine - Polestar - Arctic White
Weekend Wagon - 50k 1982 Mk2 Scirocco 1.6 GL Auto - Diamond Silver
Other Half's Wagon - 2008 Mazda 2 1.5 Sport - Cosmos Blue
Daughters Curb Scraper - 2016 Fiat 500 1.2 - White

User avatar
C 20 CCO
Posts: 219
Joined: Sat Jan 06, 2018 8:38 pm
fill in the right answer: 15
Location: Burnley, Lancashire.

Re: Cutting Out

Post by C 20 CCO » Mon May 03, 2021 12:47 pm

Check the vacuum suction at the carb. Might be worth getting a Vacuum & Fuel Pump Pressure Test Gauge Set.
I had a fuel starvation problem which turned out to be the inlet manifold gasket. In my posts... I like you nearly went over the edge. :dash:


kind regards,

Dave.

To be old and wise......
You must first be young and stupid!

Previously owned: 1984 1.6 CL in alpine white; 1986 1.6 GT in met light blue over black body kit; 1990 1.8 GT2 in silver.
Currently: 1991 GT2 in Pearl green metallic.