200 RPM increase when hot
Posted
#1514804
(In Topic #201445)
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2E2 1800 EX engine on LPG
Slightly annoying change in my RPM range lately
Have a E2E carb on a 1800 EX engine running an LPG setup with radiator water heated LPG dampner
No more manifold heat shield collector or hose and air mixer at the inlet end of the air filter box - supposely to compensate for the slightly hotter running engine with LPG
OG air filter - closed up engine breather inlet tube
The first 7 seconds on startup higher revs never worked
Latelely - the weather is getting cold I noted that with a cold engine I have a very steady 900 RPM cold idle
When hot and I noted with the water up to temperature I get a slightly higher RPM rate of 1000 - 1100
Again very steady idle - just a bit higher !
What causes this ?
BerT3
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Isn't that supposed to shut out when the water is hot enough
I keep measuring 12V even after a high way drive of 30 minutes
Faulty water temp switch ?
BerT3
Posted
MOTY 2013
http://www.vwgolfmk2.co.uk/forum/viewtopic.php?f=37&t=14917
the warm air system is essential when running petrol at least, otherwise the carb will ice up. on the LPG i assume its not an issue depending how the fuel is injected
Hello my name is John and I'm a dub addict.
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Figured out what all 3 sensors do on the cooling flange - late EX engine
I can get the idle to be correct when I take of the plugs on the TTV and over-run valve when the engine is hot
How is this fed - is it really a constant live 12V feed - I mean: not controlled by one of the thermoswitches - either inline with the grey or red switch on the cooling flange ?
The auto-choke shouldn't be constant 12V too ?
Bert
Posted
MOTY 2013
the 3/4 point unit and waxstat are the 2 main things that control the idle, so make sure both of those are working properly. if your inlet manifold oring is clogged the waxstat wont be able to do its job properly leading to increased idle revs, it doesnt do the autochoke any favours either.
If you click the link below in my signature i have the 2e2 section from the haynes carb manual scanned off, this covers the fine adjustment of the carb in much more detail useful if previous bodgers have been in there and messed up all the settings!
Hello my name is John and I'm a dub addict.
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To test that grey switch - would it be enough to unplug it when hot to get the 12V off the choke ?
I can measure it at the red plug then
BerT3
Posted
MOTY 2013
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
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You'll need to sign into google/gmail for the link to work! (its free!)
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Do have the retraction on start up of the 3/4 unit - can feel the pressure of the spring inside when trying to push it in
It retracts almost instantly - is that correct given it's rather chilly outside ?
On the other hand can't it be a reversed problem ?
I mean a low start-up idle (from another faulty component) compensated by a too much screwn cold idle bolt at the 3/4 unit
Or do I just screw on the 13mm nut at the back of the 3/4 unit to bring down the hot idle speed
Regarding the first step of those 7 sends higher RPM - is that entirely controlled by the waxstath ?
I mean does it bring cold idle down instead of up when heating up ?
Bert
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Might be a specific problem with LPG
Bad cold start / low idle since the LPG dampener need hot water to be fully opperational
I screwed up the cold start idle up a week ago when it started to get cold and had a low idle of around 500
I had a good hot idle of 900 then
To compensate I screwed the cold idle up to 900 and have the 1100 now when hot
Winter blues I guess
I'll test it on fuel this weekend to check the cold start idle RPM's
BerT3
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Can't I close up the gap of the stage 1 of the choke by turning anti-clockwise at the PDU knob just for the winter ?
BerT3
Posted
MOTY 2013
with the idle thing, if its easier you could change the length of the screw that operates on the 3/4 point unit, maybe put a couple marks on it for 'summer' and 'winter'
Hello my name is John and I'm a dub addict.
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Yes they are - new correct sized ones
The TTV gets hot - the idle over run valve clicks
with the idle thing, if its easier you could change the length of the screw that operates on the 3/4 point unit, maybe put a couple marks on it for 'summer' and 'winter'
You talking about the grub screw or the 13mm nut at the back ?
BTW - if I bridge the red water temp plug I hear a click from a relay in the fuse box
When I bridge the grey one - nothing - shouldn't it kill the 12V from the autochoke when bridged ?
BerT3
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I guess the TTV is dead (on the spare carb too) even it gets 12V but passes vacuum through instantly on contact
The autockoje grey switch is ok - the ckoke gets hot but when the the plg is bridged (simulate water hot) I keep getting 12V to it so I guess it needs a relay
Which one is it ?
I am either missing it or it's dead
Euro car EX engine 1.8 manal cabby fom '90
BerT3
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Since I bridge the plug I get 12V - if unplugged still 12V
I noticed the wires are screwed with - taped up
Anyone as a wiring scheme so I can check ?
BerT3
Posted
MOTY 2013
the inlet heater is fed from the large spade N on the fusebox, thick red/white you cant miss it. the autochoke gets ignition live from the fusebox to the thermoswitch, then a wire runs from the thermoswitch to a spade which the autochoke wire plugs into.
the TTV & inlet heater valves get an ignition live from D/7 on the fusebox, fuse 18.
I meant the grub screw, its easier to get to plus you can see any marks you make on it without having to use a mirror
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
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You'll need to sign into google/gmail for the link to work! (its free!)
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Found the wire from the auto choke !
It was cut of and found that the 2 jointed black/yellow and black wire were actually attached to the red plug from the auto choke
Both red and grey switches work - manifold heater works - relay and fuses are ok
Last problem:
The jointed black/yellow wire has to go to the carburettor heater - copper plug with male terminal above the wax thermostath according to the scheme below
While removing the air filter I noted that there is anotther plug even lower
Took out my old carburetor and it was removed - not there at all
On the setup I do have now I do have it straight wired to the carburetor heater plug
My questions:
- What is the lowest electrical part ?
- What does it do ?
- Is it needed ?
- How is it wired in since I can't find it on the scheme
Below some photos of what I am talking about
BerT3
Posted
MOTY 2013
Hello my name is John and I'm a dub addict.
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rubjonny said
the heater is the lower of the 2 electrical thingies on the front of the carb, the higher one is the thermoswitch for the rad fan after-run relay
Ok - why would both be connected to each other ?
Makes no sense at all
Would the heater makes a big difference ?
The fan does after run though - I guess from the sensor at the radiator
Was the thermoswitch always wired in ?
Bert
Posted
MOTY 2013
the thermoswitch for the rad fan after-run is wired to the after-run relay only, it triggers the relay to run the fan if the ignition is off and the carb gets to a certain temperature.
the thermoswitch switches to earth thru the carb body, so if you have an ignition live to it the fuse will pop whenever the carb gets hot!
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
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rubjonny said
they shouldn't be! the heater gets an ignition live feed as I mention above.
the thermoswitch for the rad fan after-run is wired to the after-run relay only, it triggers the relay to run the fan if the ignition is off and the carb gets to a certain temperature.
the thermoswitch switches to earth thru the carb body, so if you have an ignition live to it the fuse will pop whenever the carb gets hot!
I see
I can wire the heater in - I have those doing nothing at the moment
The thermoswitch goes to pin 5 at the radiator control unit
Finally getting there
Final question though - is there a way to test the TTV ?
Last item I can't get to function !
BerT3
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