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Old 10-29-2003, 13:13   #1 (permalink)
Choco
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poor starter

I run a 302 on gas with a 425 (?) impco mixer. Timing set to 10 init and about 34 all in at 3 thou.
The problem is that some mornings it wont start on gas no mater what i do.
To get her to start I have to go to petrol, let her warm up and then go back to gas.
Other mornings it fires first thing.

Is its idle too rich or too lean?
Is it posible the electric dizzy is giving greaf?
Is my spark plug gap to big (about .040)?

thanks in advance.
choco
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Old 10-29-2003, 14:02   #2 (permalink)
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Re: poor starter

have you checked the gap compared to the specs in the manual?
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Old 10-29-2003, 14:34   #3 (permalink)
Choco
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Re: poor starter

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Originally Posted by XTREME
have you checked the gap compared to the specs in the manual?
Nah couldn't find anything about recommended gap so went by some previous advise.
Started at .03 and moved up to .04. Everything seemed to check out ok so I left it at the .04 as i got lazy and didn't want to keep fishing.

The dizzy is a ACCEL, no vacuum advance, i think the 41000 series.

choco
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Old 10-29-2003, 22:32   #4 (permalink)
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Re: poor starter

A friend of mine recently put a 351 cleveland into an XF ute. He is running it purley on gas and had the same problems as you. Initially, the engine was not getting enough gas so he took it to a dyno and it helped slightly but it still had the same problem but to a lesser extent.

He knew he had to go for a twin throttle body (single was not supplying enough gas) but before he could afford to do this he got an MSD going cheap. Guess what - no more problems!! Car starts every time and now he has the twin throttle body on it goes extremely well.

What he was saying that with the standard ignition you get one shot, and as gas does not have an as quick moving flame front, you do not get full combustion on start up. However, with the MSD you get a lot of sparks (8 I think, will stand corrected) and the problem is now solved!!

ps remember to use a slightly hotter plug.
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Old 10-30-2003, 04:11   #5 (permalink)
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Re: poor starter

Do you have any gas leaks around the gas convertor or gas lock off valves???

Gas motors should start pretty easy if the convertor is full of gas, next time you have time, turn the ignition on, and wait about 20 seconds and then try to start it, this will give the convertor a chance to fill with gas if it is empty.

Also, if it doesnt start then, get a bucket of hot water out of your tap and tip the hot water over the gas convertor.

Let me know how you go.

Jim

p/s My clevo has a 425 straight gas carby and starts good in any weather.
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Old 10-30-2003, 13:11   #6 (permalink)
Choco
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Hot water

Quote:
Originally Posted by EXECJIM
Do you have any gas leaks around the gas convertor or gas lock off valves???

Gas motors should start pretty easy if the convertor is full of gas, next time you have time, turn the ignition on, and wait about 20 seconds and then try to start it, this will give the convertor a chance to fill with gas if it is empty.

Also, if it doesnt start then, get a bucket of hot water out of your tap and tip the hot water over the gas convertor.
Will give it a try this weekend if the weather comes good.
You have me thinking about leaks, could explain some other problems.
Will let you know what i find.
Thanks

Choco
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Old 10-30-2003, 13:55   #7 (permalink)
Choco
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Re: poor starter

Quote:
Originally Posted by paull
ps remember to use a slightly hotter plug.
Thanks will try a slightly hotter spark am due for new sparks soon anyway.

I was hoping that the accel would provide enough spark. Although i haven't upgraded too a good box yet.
Probably will go for a Crane Hi-6.

Cheers
Lachlan
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Old 10-30-2003, 13:59   #8 (permalink)
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Re: poor starter

I've run a few six cyl xe falcons on gas and had some
nightmare starting problems at times. When it did eventually start you'd have to not use any throttle at all,
otherwise it would stall - just let it chugg away for a few minutes untill it 'warmed up'. Turns out the converter was full of residue.
Once cleaned out started like a dream. Present xe has
starting problems and this time have been advised to replace the converter (fairly ancient model)

Wazza
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Old 11-02-2003, 21:00   #9 (permalink)
Choco
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Re: poor starter

OK didn't get much chance this weekend but i tried waiting for 20 seconds and it seemed to of worked. I am guessing then that i have a leak between the tank and the engine somewhere.

I will also clean the condensor anyway and see if that helps also.

Cheers
choco
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Old 11-05-2003, 06:21   #10 (permalink)
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Re: poor starter

Quote:
Originally Posted by Choco
OK didn't get much chance this weekend but i tried waiting for 20 seconds and it seemed to of worked. I am guessing then that i have a leak between the tank and the engine somewhere.

I will also clean the condensor anyway and see if that helps also.

Cheers
choco
OK, now to test for leaks, start the motor on gas, and spray around all the gas pipe fittings and joiners with something like "windex" or another type of "dish washing detergent" that will bubble when the gas try's to escape.

Hope this helps??

Jim
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