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Newly installed Impco, cold start issue 

 

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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Sat Dec 04, 2010 12:01 am 
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snap0964 wrote:
The Impco systems I've seen have a petrol start unit - it has an adjuster to vary how long petrol stays on during an LPG start (switch is selected to LPG).
I looks like a small black box, with connections to earth, the Petrol setting of the Fuel select switch, and to the starter solenoid line. It has CP66 marked on it, from memory.
What you can do is mark the adjuster position with white out. Then adjust it each way (run a few times in that position) and see what is the best compromise.
Should say near it which way does what.

 

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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Sat Dec 04, 2010 12:19 pm 
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tickford_6 wrote:
fzulwr wrote:
Now situation changes. After sitting a long time, car will be started very quickly.
But if you start it again immediately or after a short time, it will be a little bit struggling.


Started on what fuel? If you want help your going to have to start adding a lot more detail.


It looks like when cold start, it will use petrol, and when car is warm, it still use gas to start. But the guy told me every time it will use petrol. I will go back again next week.
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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Mon Dec 06, 2010 1:12 am 
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going by the look of the pics of the air intake, the PCV also needs to be re plumbed. Also make sure the have changed the PCV to a metal one

 

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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Mon Dec 06, 2010 11:12 pm 
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snap0964 wrote:
snap0964 wrote:
The Impco systems I've seen have a petrol start unit - it has an adjuster to vary how long petrol stays on during an LPG start (switch is selected to LPG).
I looks like a small black box, with connections to earth, the Petrol setting of the Fuel select switch, and to the starter solenoid line. It has CP66 marked on it, from memory.
What you can do is mark the adjuster position with white out. Then adjust it each way (run a few times in that position) and see what is the best compromise.
Should say near it which way does what.


Hi mate, I found out it is CP 66 as you say. How can I adjust, can you explain in more detail? thanks.
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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Mon Dec 06, 2010 11:49 pm 
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Petrol Starter
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Last edited by fzulwr on Mon Dec 06, 2010 11:52 pm, edited 1 time in total.

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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Mon Dec 06, 2010 11:52 pm 
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Petrol Starter
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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Tue Dec 07, 2010 12:16 am 
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fzulwr wrote:
Now situation changes. After sitting a long time, car will be started very quickly.
But if you start it again immediately or after a short time, it will be a little bit struggling.
Define 'long time' - over 2 hrs, and/or first start of the day ??
fzulwr wrote:
snap0964 wrote:
snap0964 wrote:
The Impco systems I've seen have a petrol start unit - it has an adjuster to vary how long petrol stays on during an LPG start (switch is selected to LPG).
I looks like a small black box, with connections to earth, the Petrol setting of the Fuel select switch, and to the starter solenoid line. It has CP66 marked on it, from memory.
What you can do is mark the adjuster position with white out. Then adjust it each way (run a few times in that position) and see what is the best compromise.
Should say near it which way does what.

Hi mate, I found out it is CP 66 as you say. How can I adjust, can you explain in more detail? thanks.
What detail?? Already covered above - label tells you the rest. Adjuster is the little trimpot left of the terminals, use a flatblade instrument screwdriver.
Nigel wrote:
The Petrol start isnt needed when the car has been running, and so the engine will get rich mixture (LPG and Petrol) for the initial crank. When the Petrol injectors cut out it will start fine.
Has the pin or jumper has been removed (2 hr delay) written on the label ?

 

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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Tue Dec 07, 2010 2:46 pm 
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macxr8 wrote:
going by the look of the pics of the air intake, the PCV also needs to be re plumbed. Also make sure the have changed the PCV to a metal one



If you don't have the PCV conected to manifold vacuum it won't work. They also only flow in one direction. It's the breather at the back of the rocker cover that should be replumbed before the mixer.

 

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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Tue Dec 07, 2010 9:07 pm 
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tickford_6 wrote:
macxr8 wrote:
going by the look of the pics of the air intake, the PCV also needs to be re plumbed. Also make sure the have changed the PCV to a metal one



If you don't have the PCV conected to manifold vacuum it won't work. They also only flow in one direction. It's the breather at the back of the rocker cover that should be replumbed before the mixer.


Factory gas system have a plate under the ISC to allow the PCV and rocker breather to connect to

 

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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Tue Dec 07, 2010 9:48 pm 
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macxr8 wrote:
tickford_6 wrote:
macxr8 wrote:
going by the look of the pics of the air intake, the PCV also needs to be re plumbed. Also make sure the have changed the PCV to a metal one



If you don't have the PCV conected to manifold vacuum it won't work. They also only flow in one direction. It's the breather at the back of the rocker cover that should be replumbed before the mixer.


Factory gas system have a plate under the ISC to allow the PCV and rocker breather to connect to


yes they do, but the PCV in that case is still connected after the mixer, But the rocker cover breather doesn't connect to it.

 

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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Tue Dec 07, 2010 10:11 pm 
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The breather is certainly essential it get's clean air - a gas charge going through the rocker cover won't help with a backfire.
IIRC it's been mentioned a few times in threads here that the factory ISC plate is for lubrication of the ISC ??
Again, this was only for ISC issues ??

 

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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Tue Dec 07, 2010 10:26 pm 
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snap0964 wrote:
The breather is certainly essential it get's clean air - a gas charge going through the rocker cover won't help with a backfire.


Which is why it needs to be plumbed in before the mixer.
The PCV on the other hand needs to be connected to manifold vacuum.

 

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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Sat Dec 11, 2010 11:02 am 
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I went back again, and got the final solution.
Put a jumper on CP66 petrol starter.
Now it is always started with petrol.

Thanks everyone. :D
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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Sat Dec 11, 2010 4:55 pm 
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how many kms u get out of a tank of lpg???

 

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 Post subject: Re: Newly installed Impco, cold start issue
Posted: Sat Dec 11, 2010 8:44 pm 
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MICKYYYY wrote:
how many kms u get out of a tank of lpg???


around 350KM / 55 Liters
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