GS cold start struggle!
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Thread: GS cold start struggle!

  1. #1
    Fellow Frogger!
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    Default GS cold start struggle!

    Hi all,

    Lately I've been having problems cold starting the GS. Once it starts it runs beautifully, carby has been rebuilt, ignition leads are fine, sparkplugs good and points replaced not long ago...can't put my finger on it

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  2. #2
    Real cars have hydraulics DoubleChevron's Avatar
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    I'd be checking to see if it's draining the fuel off to the tank first (ie: it has to crank petrol all the way up from the tank each time you start it from cold). Check the choke flaps are closing on the carby too

    seeya,
    Shane L.
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    DS
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    Is it cranking slowly or normally?

    I once lived with a 2CV that wouldn't start on cold winter mornings unless you had put a blanket over the engine the night before. Now explain that sillyness to me!
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  4. #4
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    Quote Originally Posted by DS View Post
    Is it cranking slowly or normally?

    I once lived with a 2CV that wouldn't start on cold winter mornings unless you had put a blanket over the engine the night before. Now explain that sillyness to me!
    It's cranking normally...just takes way too long to fire up, lucky I have a gutsy battery!

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    Ashtray Polisher donat's Avatar
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    Do you start yours up daily? I find with the 1015 and only the 1015 where if I don't start it for three days or more, it's indeed a struggle to fire it up and can take a minute of farting around to make it all happen.
    1972 SM
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    Real cars have hydraulics DoubleChevron's Avatar
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    Quote Originally Posted by raver View Post
    It's cranking normally...just takes way too long to fire up, lucky I have a gutsy battery!
    Loop a long line of fuel line up above the level of the carby (if the inline filter is here, place it up higher than the carby). If the car then starts of a morning, it's draining off all the fuel to the tank overnight.

    GS's seem to have weak one way vavles in the fuel pump to prevent the fuel draining off. You could always fit an electric pump if it's a rarely driven car (with the ID's you just pop the bonnet and prime the carby with the lever on the fuel pump).

    Old land rover and range rovers seem to all have electric fuel pumps, so that could be a source for one if you know someone with a backyard full of them.

    seeya,
    Shane L.
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    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

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  7. #7
    Ashtray Polisher donat's Avatar
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    Quote Originally Posted by DS View Post
    Is it cranking slowly or normally?

    I once lived with a 2CV that wouldn't start on cold winter mornings unless you had put a blanket over the engine the night before. Now explain that sillyness to me!
    And here I was thinking that putting a blanket over the SM before I go to bed every night and reading it the owner's manual as a bedtime story was silly!
    1972 SM
    1989 BX 16 Valve

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    Real cars have hydraulics DoubleChevron's Avatar
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    Quote Originally Posted by donat View Post
    And here I was thinking that putting a blanket over the SM before I go to bed every night and reading it the owner's manual as a bedtime story was silly!
    Surely nothing would be easier to cold start than something with 3 twin choke webers .... A couple of prods of the accellerator before you turn the key should flood the engine with enough fuel to start it even if it's minus 5 outside
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    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

    Yay ... No Slugomatics


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    Quote Originally Posted by DoubleChevron View Post
    Loop a long line of fuel line up above the level of the carby (if the inline filter is here, place it up higher than the carby). If the car then starts of a morning, it's draining off all the fuel to the tank overnight.

    GS's seem to have weak one way vavles in the fuel pump to prevent the fuel draining off. You could always fit an electric pump if it's a rarely driven car (with the ID's you just pop the bonnet and prime the carby with the lever on the fuel pump).

    Old land rover and range rovers seem to all have electric fuel pumps, so that could be a source for one if you know someone with a backyard full of them.

    seeya,
    Shane L.
    Ok cheers I'll try that...so a new fuel pump should fix this issue if draining back to tank is indeed the problem?

    What Bar rating electric fuel pump should I source if I decide to go that way?

  10. #10
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    When you start cold use full choke. Once it fires then it will be happy on half choke or less, pretty much immediately.

    If it hasn't been run for a week or more it will take a bit of cranking to fill the carby up again.

    If you want to take the duct off the top of the carby, pull on full choke, and ensure that the flap on the carby is closed. ie:Just to make sure that you are getting what you should be.

    Is it a Solex or Webber? Not that it really matters.
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    Quote Originally Posted by XM Mechanic View Post
    When you start cold use full choke. Once it fires then it will be happy on half choke or less, pretty much immediately.

    If it hasn't been run for a week or more it will take a bit of cranking to fill the carby up again.

    If you want to take the duct off the top of the carby, pull on full choke, and ensure that the flap on the carby is closed. ie:Just to make sure that you are getting what you should be.

    Is it a Solex or Webber? Not that it really matters.
    Checked choke operation seems ok...flap is closed with choke out...problem occurs on initial start up whether it's been 1 day or 6 months since last driven...anytime longer than 12hrs or so..ie. overnight

  12. #12
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    Quote Originally Posted by raver View Post
    Ok cheers I'll try that...so a new fuel pump should fix this issue if draining back to tank is indeed the problem?

    What Bar rating electric fuel pump should I source if I decide to go that way?
    If you do go electric pump, you don't want anything more powerful than 5PSI. Much more powerful than that and you'll have multiple carb problems with sealing and flooding. Remember- the pump is only to get the fuel to the carb, not assist in atomizing the fuel like an EFI system.

    An electric pump should slow down or even stop delivery when the float bowl is full because of backpressure in the line.

    You may want to look into a check valve if you don't go electric. This should prevent the fuel from draining back into the tank.
    The measure of your character isn't what you do when people are watching- it's what you do when they aren't watching.

  13. #13
    UFO
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    Does a shot of Startyabastard down the air intake prompt instant starting. I sometimes do this with the D before starting after a long rest. That and the full choke to start then back off.
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    Quote Originally Posted by DoubleChevron View Post
    I'd be checking to see if it's draining the fuel off to the tank first (ie: it has to crank petrol all the way up from the tank each time you start it from cold). Check the choke flaps are closing on the carby too

    seeya,
    Shane L.
    You can buy one-way valves too for the fuel line for very little money. Fit it on the suction side of the pump. Check out ebay.
    JohnW

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    Forgot to mention.... there is fuel in the carby before I attempt to start it 1st thing in the morning, maybe not strong enough spark for cold start?

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    Fellow Frogger! Andy N's Avatar
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    I had a problem not long ago with the condenser on my GS. Once replaced it was fine. I wasn't sure what it was for a long time because when I pulled a plug I could see there was a spark when it was cranked over. The difference was the quality and regularity of the spark which was very different with the replaced condenser. Worth checking if you have a strong fat spark. I find an electric fuel pump isn't necessary on my GS as it turns over easily.... the CX on the other hand does benefit from going electric as it takes so much battery power to turn over.

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    Quote Originally Posted by Andy N View Post
    I had a problem not long ago with the condenser on my GS. Once replaced it was fine. I wasn't sure what it was for a long time because when I pulled a plug I could see there was a spark when it was cranked over. The difference was the quality and regularity of the spark which was very different with the replaced condenser. Worth checking if you have a strong fat spark. I find an electric fuel pump isn't necessary on my GS as it turns over easily.... the CX on the other hand does benefit from going electric as it takes so much battery power to turn over.
    Thanks Andy have'nt considered this before, have spoken to 2 carby specialists about the issue and both mentioned that a weak spark could be the problem ...a new condenser is cheap and if anything will improve the spark as you said...Cheers!

  18. #18
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    Quote Originally Posted by raver View Post
    Thanks Andy have'nt considered this before, have spoken to 2 carby specialists about the issue and both mentioned that a weak spark could be the problem ...a new condenser is cheap and if anything will improve the spark as you said...Cheers!
    I just hope it is as simple as that. Best to actually pull a plug and get someone to turn over the engine and see what the quality of the spark is like. I wouldn't advise replacing parts just in case you find a solution but certainly if you have a weak or erratic spark pattern then trying a new condenser wouldn't cost you so much. I wish you the best of luck. It took weeks for me to get my GS going but for a failing condenser!

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