Failed MOT
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sorry wasn't sure where to place this post.
so today my car went for a mot for the first time in 5 years' unfortunately it failed
![Description: Description:](file:///C:\Users\Daz\AppData\Local\Temp\msohtmlclip101\clip_image002.png)
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so the issues were high c02 which came up at 9.99% apparently the limit is 2.5 judging from my emission results and if I'm honest I knew it was running rich as I can smell it if that makes sense or tell me I'm talking sh**
![Description: Description:](file:///C:\Users\Daz\AppData\Local\Temp\msohtmlclip101\clip_image003.gif)
![Description: Description:](file:///C:\Users\Daz\AppData\Local\Temp\msohtmlclip101\clip_image003.gif)
![Description: Description:](file:///C:\Users\Daz\AppData\Local\Temp\msohtmlclip101\clip_image003.gif)
the second thing was brakes imbalanced across the rear axle by more than 50%. the technician said the driver's side rear brake was non-existent.
The rear brake shoes on both sides were changed and passenger side brake cylinder also, ive just picked up a new cylinder and will fit that the weekend but wondered if I need to do more’ would it be the cylinder ??
Back to the emission’s any ideas guys I haven’t a clue what to do hear’ will it be a carb adjustment ??
Really appreciate your help here guys as I’m lost now
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Local Hero
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Another trick is to use a bradawl or pointy screwdriver to pull down the wedge adjuster thru a bolt hole with the wheel on and off the ground. This takes up all the slack so half the pedal stroke isn't wasted doing nothing
You don't say if GTI or carbie but assuming plugs, air filter, oil etc are pretty new both really need a CO meter and someone who knows what they are doing, its really easy on both to foul up twiddling random adjustments .
1983 Mars Red 1.8 Golf GTI
1987 Alpine White 1.8 Clipper Cabriolet
The trouble with doing nothing is that you never know when you are finished.
1987 Alpine White 1.8 Clipper Cabriolet
The trouble with doing nothing is that you never know when you are finished.
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Local Hero
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There's ways to sense whether its running rich or lean if its K-Jet, from experience.
If its a carb car…..what carb is on it and what engine? I am guessing 1800 from the pic.
Regarding the brakes, it will probably be something obvious if its completely not working on one side - could be a kinked brake line, for example. Or the mechanism seized in the drum. Its obviously worth having new drums (they're only about £10???) or taking the lip off and cleaning up the old ones, then you can do the lion's share of the adjustment with the drum off, then put it on and complete the adjustment, which is awkward because the auto-adjusters never seem to work.
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HC max 1200ppm actual 475 ppm
CO max 3.5% actual 9.99%
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Could be the Webber carb needs adjusting, the mixture screw is on the side of the carb and needs screwing in a little, I guess it's not a garage you usually use for an MOT as my local garage adjusted mine for me when my car as over the limit as it takes seconds to adjust it and while it's on the machine it's the perfect time…
1988 Mk1 Golf GTi Cabriolet 1.8cc DX, K-jet. Daily drive. 317,000 miles and counting
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
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You need the bigger rear wheel cylinder.
Pics of valves here..
https://vwgolfmk1.org.uk/forum/index.php?page=topicview&id=technical%2Frunning-gear_2%2Frear-brake-regulator
1988 Mk1 Golf GTi Cabriolet 1.8cc DX, K-jet. Daily drive. 317,000 miles and counting
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
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The air filter is new so guess the carb needs adjusting, would there be any guides for this anywhere ?
Ive picked up a rear wheel cylinder from car spares and stated the registration, its the same as the one that needs removing so fingers crossed, think i will do a full brake clean down , I'm not even sure how i would search for the webber carb is there a specific name for it ?
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HC max 1200ppm actual 475 ppm
CO max 3.5% actual 9.99%
quote]
I think its generally as the co gets worse the hc gets better, hence the low reading
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https://vwgolfmk1.org.uk/forum/index.php?page=topicview&id=helllllpppp%2Fweber-fitting-guide
You will find as you adjust the mixture the idle speed will change so you also need to adjust the tick over.
You only need to move the mixture screw a little to make a difference.
This is assuming the engine timing is spot on.
Last edit: by mark1gls
1988 Mk1 Golf GTi Cabriolet 1.8cc DX, K-jet. Daily drive. 317,000 miles and counting
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
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Ive just sourced Rubjohhy pdf from his signiture, it would seem rule of thumb looking at the other information collated is turner the jet in decreases the Co2 but i must try and maintain tick over
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Without a meter or gas analyser of any kind, the technique is approximately this:
Turn the mixture screw anticlockwise (out, increase fuel, increase CO, reduce AFR) until the revs start going down. Then turn it clockwise (in, decrease fuel, decrease CO, increase AFR) until the revs decrease again. Then turn it back a tweak so the revs increase.
Revs will vary but should be approx around the idle range. If its wildly low or high, or the car can't run and stalls during the above procedure, adjust them then do it all again.
This assumes the carb is jetted correctly for the application. That's a whole another thing!!
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paul_c said
Firstly….its CO, not CO2!!!! But I know what you mean.
Without a meter or gas analyser of any kind, the technique is approximately this:
Turn the mixture screw anticlockwise (out, increase fuel, increase CO, reduce AFR) until the revs start going down. Then turn it clockwise (in, decrease fuel, decrease CO, increase AFR) until the revs decrease again. Then turn it back a tweak so the revs increase.
Revs will vary but should be approx around the idle range. If its wildly low or high, or the car can't run and stalls during the above procedure, adjust them then do it all again.
This assumes the carb is jetted correctly for the application. That's a whole another thing!!
Thanks Paul C will i have to adjust the idle first ? i been at the moment it idles perfect and starts first time
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You'll need to set the idle speed afterwards, for sure, but its very very easy on a Weber carb and can be done with no tools, unless yours is weirdly different???
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Is it worth starting at baseline levels first as the webber PDF states, I'm not sure it was ever setup properly judging by the number of things that were bad on the car.
also can the adjustment be made without the air filter on ?
weberbasesetup.pdf
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1988 Mk1 Golf GTi Cabriolet 1.8cc DX, K-jet. Daily drive. 317,000 miles and counting
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
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I a "see through" spark plug.
Adjust the co screws until the flame is pale blue.
Job done.
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I've had a go today and feel pretty chuffed, the mixture has been set' it was really far out to be honest so I'm hopeful now' I took it for a spin and she drove lovely really responsive and smooth.
The rear brakes have also been done there was grease on the shoes so a quick cylinder change and good clean before bleeding, My only issue is the back brake is now operating on 1 click when driving down the road the back wheels lock up as soon as i pull the handbrake up .
Question is ….Is 1 click ok or should i realize the cables from the handbrake until i get 2 ?
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Failed MOT
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