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> vacum leaks, looking for vacum leaks
T l2 O Y
post Aug 27 2004, 06:24 PM
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we are looking for vacum leaks this weekend what sprays do we use?

carb cleaner?
ether starting spray?

we just painted everything in the engine, tin etc. will it remove the paint?
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qa1142
post Aug 27 2004, 07:03 PM
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Use a propane torch (don't light it)

It will raise rpm if you find a leak and won't mess anything up.

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Bleyseng
post Aug 28 2004, 01:17 AM
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Sumner....another new guy from Washington on the list.

I use starting fluid spray but use just a little bit as you can fill the engine compartment with it and get phoney results.

Geoff
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anthony
post Aug 28 2004, 08:03 AM
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Have you replaced all the vacuum hoses yet? Search for the chart/diagram here and then use it as a guide for the sizes. Measure all your hoses with a tape measure to get a rough estimate of how much in each size you will need. New hoses cost me $12 at my local air cooled VW shop.
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T l2 O Y
post Aug 28 2004, 08:13 PM
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Trekkor
post Aug 29 2004, 12:11 AM
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I use either carb cleaner or brake cleaner (IMG:style_emoticons/default/unsure.gif) with the straw in the tip.

Just a *short* burst at the hose end or gasket base will will give it up.

KT
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T l2 O Y
post Aug 29 2004, 03:57 PM
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anthony
post Aug 29 2004, 04:10 PM
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Why are you bumping? People have given you some answers. You could do a search and find more. Have you tried any of the above. Why not ask a more specific question if you want more info?
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Brad Roberts
post Aug 29 2004, 04:15 PM
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Yep. Help us out.. tell us whether or not you have TRIED the brake cleaner/carb cleaner method.


B
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2-OH!
post Aug 30 2004, 01:40 PM
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We did try it with Carb cleaner, Starting fluid and even tried the Propane...No leaks...Squirted every hose connection, intake boots, intake manifold to heads, throttle body, throttle body plenum, advance/retard cannister, fuel injector retainers...

Changed all vacuum hoses with new...

No noticable change in running or RPM...

Double checked the timing, electronic ignition...Valves are freshly set, .006 & .008...

Still will not idle below 13/1400...

2-OH! & TI2OY
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Joe Ricard
post Aug 30 2004, 01:50 PM
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Then you have no vacuum leaks. Start proving the components good or bad. MPS, Fuel pressure, Injectors. Did you static set the TPS? good electrical connections all over. Temp sensors operating. Oh and if you are using the cold start system on your car is the valve shut once the engine warms up????

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Bleyseng
post Aug 30 2004, 01:53 PM
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Ok, does the AAR valve close ALL the way or is it stuck open? This is the most common cause of high idle.. Try plugging the hose with your finger to see if the idle goes down.
Geoff
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SirAndy
post Aug 30 2004, 01:58 PM
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QUOTE(Bleyseng @ Aug 30 2004, 12:53 PM)
Ok, does the AAR valve close ALL the way or is it stuck open? This is the most common cause of high idle.. Try plugging the hose with your finger to see if the idle goes down.

(IMG:style_emoticons/default/agree.gif) plug the AAR hoses and see if that works ...

when the AAR goes bad, it stays open = constant vaccum leak !

(IMG:style_emoticons/default/wink.gif) Andy
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2-OH!
post Aug 30 2004, 02:05 PM
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We have tried to jiggle or shake every connector in the engine compartment but none seem to have made any difference...

MPS holds a vacuum, don't know of any other test...

2 of the 4 injectors are new and the others have been cleaned and operate but the spray pattern was not checked...

Temp sensors, don't have a way to check them, the electrical connetions are tight because they don't change the RPM when we wiggle em'...

Cold start valve (AAR) does close after warmup, remove hose, and plug causes no difference...When cold, makes big difference...

I don't know what the TPS is...Can I get more definition ...

Fuel pressure has not been checked...would too much pressure cause high idle...Certainly if it was too low, we would not have high RPM...

2-OH! & TI2OY
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Joe Ricard
post Aug 30 2004, 02:21 PM
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Try here http://www.pelicanparts.com/techarticles/9...ttle_switch.htm
There was another article I found that had a procedure for testing every sensor and widget on the motor. Damn I can't find it but I tought it was on the PP tech article section.
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2-OH!
post Aug 30 2004, 03:24 PM
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Thanks Joe...We will set up this test tonight, it's one we haven't tried...

2-OH! & TI2OY
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2-OH!
post Aug 31 2004, 03:21 PM
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Joe:

Thanks for the TPS tip, it worked ....Well partially...We trimmed another 200 RPM off and now idle at about 1100...

I noticed this AM on the way to work, that with the lights on...the RPM still hunts about + or - 800 RPM ...With lights off, no hunt, steady as a rock (although at 1100)...

That makes me think there are electrical gremlins at work here...

Any thoughts...

2-OH! & TI2OY
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