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Underbody braces, turbos and more!

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PostPosted: Mon May 02, 2016 11:28 pm 
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Location: hampshire
The idle screw.


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PostPosted: Tue May 03, 2016 6:52 am 
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You shouldn't adjust that it just messes things up. Try putting it back to the way it was and use the throttle cable adjustments instead. Also check your timing with a light, it should be around 8 degrees advanced.

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PostPosted: Tue May 03, 2016 4:40 pm 
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beached wrote:
You shouldn't adjust that it just messes things up. Try putting it back to the way it was and use the throttle cable adjustments instead. Also check your timing with a light, it should be around 8 degrees advanced.


What??? Not sure where you got that from, but you should never mess with the screw that sets the throttle cable.

To answer the previous question about idle set points, it is always set with the engine at operating temp, so let it warm up until the cooling fan runs, and then using the screw that is built into the throttle body, adjust it until it idles around 850rpm.

As for a high idle when it is cold, that is normal, in our winter months, I've seen them idle close to 2k RPM. You never mentioned how high it idles when it is cold, but 1500rpm isn't unheard of, if it a lot higher than that, you might have a vacuum leak somewhere.

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PostPosted: Wed May 04, 2016 1:10 pm 
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Location: hampshire
thanks guys, ive set the idle speed now and it seems quite good. I set it a little higher than you recommended as im still a bit worried about oil pressure. ive been thinking about it and id quite like to put a new pump in it, for peace of mind more than anything. any advice on what I should put in it? is it worth going genuine? is the standard 1.3 pump the same as the gti?

Thanks again for the help.


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PostPosted: Thu May 05, 2016 2:51 pm 
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I haven't had a great deal of luck sourcing a new oil pump. ive read that these pumps can be shimmed so id quite like to give that a go! any advice on how to do it and how thick a shim to use?


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PostPosted: Thu May 05, 2016 3:30 pm 
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Yeah finding a new pump could be tricky.. You should do a little research on this but I seem to recall a 1.6 pump will fit and yield higher oil pressure.

Honestly though, I wouldn't worry about the oil pressure.

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PostPosted: Mon May 09, 2016 12:00 pm 
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you are right, I probably shouldn't worry too much but these things do play on my mind. ive fitted my new pressure switch, I chose the higher pressure one and all seems fine, it doesn't illuminate the light at all when the engine is running. I will probably use it like that until I cover my first 500 miles and then put slightly thicker oil in and see if it makes much difference.

I do of course have another problem now though... when ive been driving it for a while and the engine is hot it wont idle properly. when I come to a stop and take my foot off the throttle the revs drop to around 850rpm and it will idle nicely for about 10-15 seconds but after that they quickly drop further until the engine dies.. any ideas?

Thanks for all the help guys!


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PostPosted: Mon May 09, 2016 8:20 pm 
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That is strange for sure.. I think you might have more than one problem which is causing the issue.

For starters when you close the throttle, the dashpot slows the closing of the throttle the last little bit which for most people causes the idle to stay high for a few seconds normally and then drop down to your normal idle set point.

So I would try re-adjusting your idle AFTER driving it to make sure it is good an hot and see if that corrects this issue, but I suspect that you might have a vacuum leak (when cold), a bad fast idle valve, or a bad cold start valve too.. This is going to be a little tricky to sort i'm afraid. You should just for good measure check the TPS adjustment to make sure it is accurate.

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PostPosted: Tue May 10, 2016 3:52 pm 
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Thanks, I will run through that all and let you know how I get on. checking for air leaks is a good idea! im unsure on how to check the tps adjustment, are there any good instructions on the internet?

Thanks!


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PostPosted: Tue May 10, 2016 4:21 pm 
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at the very top of each section there is a stickied thread that says, "check here first."

Throttle Position Sensor (TPS) check and adjustment:
Lihtan/gti/tpsadjustment.pdf*

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PostPosted: Fri Jun 10, 2016 10:30 am 
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I replaced my oil pump the other day and it did not improve the pressure at high temperatures. My manual states it should be 58-68 psi at 3000rpm when hot. Mine is more like 45/50 (at about 90 degrees Celsius) what checks can I do to determine what it could be?

Also, the company I bought the pump from said the g13b and g13a pumps are the same. Is this correct? I'm not so sure and worried they've given me an a pump...


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PostPosted: Fri Jun 10, 2016 1:24 pm 
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The oil pressure seems correct around 80 degrees Celsius, but it's usual operating temperature is around 90. I'm using 10w30 oil.


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PostPosted: Fri Jun 10, 2016 4:27 pm 
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Honestly your worrying over nothing..

Just drive and enjoy the car.

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PostPosted: Sat Jun 11, 2016 6:41 am 
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I will try not to worrie but no promises.

Another question: I would like to have an oil pressure light and gauge. Can I tap one of them into that port on the side of the oil pump?


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