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 Post subject: Re: Miss fire under load
PostPosted:Fri Mar 13, 2015 8:11 pm 
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Big Block
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Joined:Sun Jan 13, 2013 7:00 am
Posts:1158
Car Details:1986 Camaro, bought into Spain by me in 1993.
305 replaced by a 355, 750 Demon carb, RPM AirGap intake, Brodix heads, Hedman Hedders, 3" Flowmaster exhaust.
Wheels are Summit aluminium 5 spokes, tyres are 245 rear 225 front BF Goodrich.
B/M transmission, battery relocated to the rear, GoodMark 4" cowl steel hood.
Location:Spain East Coast
Bummer, the dollar/Euro and Euro/pound has gone to poop, gone are the good exchange rates.

http://www.realsteel.co.uk/

Summit have some.......
http://www.summitracing.com/int/search/ ... =Ascending


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Re: Miss fire under load

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 Post subject: Re: Miss fire under load
PostPosted:Tue Mar 17, 2015 2:29 pm 
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Big Block

Joined:Tue Jun 17, 2014 7:23 pm
Posts:86
Car Details:1967 Camaro 327
Location:Hannover Germany
I have come to the conclusion that I have a non stock cam fitted.
Since I have owned the car the idle has always been a problem and the only way around this is to turn the tick-over up to at least a 1000rpm.
Once the car is placed into drive the revs die dramaticly and there is no vacuum, I have yet to measure the vacuum yet though. I have however checked for vacuum leaks around the carb and inlet manifold.
Another indication I have is the car lacks power on initial throttle but once it starts revving the thing goes like a bat out of hell. A friend of mine over here has a 1968 Vette with a 350 and he can not stick with me.

I have yet to confirm this by removing the cam but I am pretty sure.
To tell you the truth I would rather have a stock cam fitted as I am more of a cruiser then a full throttle kind of guy :cry:
If any of you guys have a spare stock cam for a 327 sitting in your garage let me know I will gladly take it off your hands ;)

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 Post subject: Re: Miss fire under load
PostPosted:Tue Mar 17, 2015 9:08 pm 
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Big Block

Joined:Tue Jun 17, 2014 7:23 pm
Posts:86
Car Details:1967 Camaro 327
Location:Hannover Germany
Vacuume test done .
At 1000rpm = 15.7 inHg
Is this correct?

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 Post subject: Re: Miss fire under load
PostPosted:Wed Mar 18, 2015 9:52 am 
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Big Block
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Joined:Tue Feb 23, 2010 12:40 pm
Posts:3245
Car Details:'79 Camaro, 350 V8
Location:South Bucks
According to this, you're not far off at all:

http://www.cdxetextbook.com/toolsEquip/ ... gauge.html

Idle
16" - 22" steady
Healthy

Idle
14" - 20" steady
Fair but worn

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 Post subject: Re: Miss fire under load
PostPosted:Wed Mar 18, 2015 10:16 am 
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Big Block
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Joined:Fri Mar 19, 2010 1:35 am
Posts:2566
Car Details:79' camaro road & track day toy. 383 stroker, 5 speed TKO trans, lots of suspension stuff, 13" Vette brakes, 18" wheels.
Location:Luton
Could it be related to the noisy fuel pump, or a fuel related issue..?
I'm guessing all timing and spark options have been eliminated by new dizzy, plug wires etc.. and set correctly.

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 Post subject: Re: Miss fire under load
PostPosted:Wed Mar 18, 2015 6:27 pm 
Offline
Big Block

Joined:Tue Jun 17, 2014 7:23 pm
Posts:86
Car Details:1967 Camaro 327
Location:Hannover Germany
Chevy-stu you hit the nail on the head.
I changed the fuel pump today and my word what a difference. The car has full power and Is idling like it has never done before, purrrrrring ;)
Who would have thought that a fuel pump would have effected the idle. Like they say everyday is a school day. :thumbup:

Thanks all for you help :clap:

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 Post subject: Re: Miss fire under load
PostPosted:Wed Mar 18, 2015 7:06 pm 
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Big Block
User avatar

Joined:Fri Mar 19, 2010 1:35 am
Posts:2566
Car Details:79' camaro road & track day toy. 383 stroker, 5 speed TKO trans, lots of suspension stuff, 13" Vette brakes, 18" wheels.
Location:Luton
Excellent ...
Pleased it worked out! !.

Some carbs, particularly Edelbrocks, are very sensitive to fuel pressure too, so worth investing in a regulator.

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