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 Post subject: Loss of power
PostPosted:Wed Apr 20, 2016 8:28 pm 
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Small Block

Joined:Sun Mar 20, 2016 9:56 am
Posts:49
Car Details:1977 305 Camaro
My 77 305 has been getting driven nightly as the weathers been good.....twice it has started to lose power under acceleration in top gear(turbo 350).....tonight I thought it was going to conk out...I'm not caning it....was doing around 40 accelerating and it stated to fail...now I know there could be many reasons.....I've looked a nd checked plug leadsto make sure they're on properly....and the battery con's look fine...so any suggestions would be great.


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Loss of power

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 Post subject: Re: Loss of power
PostPosted:Thu Apr 21, 2016 9:47 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
Bugger that's not good to hear!
There are people on here far more skilled than me, so i'll throw in a few basic suggestions to get started with.
Timing - are you able to check to see if it's kept timing, sometimes it can slip?
Vacuum leak - i'm not sure how to test this, but i've heard about using a smoke machine and then i guess you look for areas where the smoke gets sucked into the engine. This could be at vacuum line connections or gaskets.
That's all i can think of right now, hope it helps!

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 Post subject: Re: Loss of power
PostPosted:Thu Apr 21, 2016 5:10 pm 
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Small Block

Joined:Sun Mar 20, 2016 9:56 am
Posts:49
Car Details:1977 305 Camaro
Thanks...I don't have the kit do do either of these things at the mo......I had a similar prib years ago with a Vauxhall nova...turned out to be pin holes in the butterfly valve in the carb...my brake pressure variestoo...and someone had mentioned the vacuum....it starts brightly and runs fine apart from this odd occasional glitch.


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 Post subject: Re: Loss of power
PostPosted:Thu Apr 21, 2016 6:04 pm 
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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
I reckon vaccum is a good place to start if brake pressure is varying ... There'll be pipes from carb/inlet manifold to brake servo, and distributor, so check these are on ok and not rotten..

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 Post subject: Re: Loss of power
PostPosted:Thu Apr 21, 2016 8:55 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
What carb have you got, does it idle okay ?


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 Post subject: Re: Loss of power
PostPosted:Thu Apr 21, 2016 10:00 pm 
Offline
Small Block

Joined:Sun Mar 20, 2016 9:56 am
Posts:49
Car Details:1977 305 Camaro
It has a misfire....I started it from cold tonight and could hear it from the exhaust....I don't know what carb it has...it has an edelbrock manifold....I'll look more closely at those pipes....at a glance they don't look obviously damaged as in split but I guess I maybe should take them off.....is it a cheapish fix to to replace those...it'll be a case of process of elimination I guess?


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 Post subject: Re: Loss of power
PostPosted:Fri Apr 22, 2016 8:18 am 
Offline
Big Block
User avatar

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
With the motor idling, spray carb cleaner around all the gasket joints, manifold to heads, carb to manifold etc., use a can with the thin tube to get in close.
You still did'nt tell me what carb you have.
Do you have a load of vacuum pipes etc., if so spray those too.
Don't lather up the areas with cleaner just enough, if the idle changes you've found the leak.
There could be an internal leak too, manifold to heads.
You could start off by tightening the manifold to head bolts, snug them down.


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 Post subject: Re: Loss of power
PostPosted:Fri Apr 22, 2016 6:59 pm 
Offline
Small Block

Joined:Sun Mar 20, 2016 9:56 am
Posts:49
Car Details:1977 305 Camaro
Thanks.....I had to check for identify on the carb...its a Rochester Quadrajet....I've attached pics of the pipes which all look relatively new....the engine was rebuilt so the dealer told me although dates unknown....the only pipe that lookssuss is the engine to air filter one as it has a rubber sleeve around it as you'll see and felt sloppy fit as I gently pulled it...maybe if it was rebuilt it needs head bolts retorqued?


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 Post subject: Re: Loss of power
PostPosted:Fri Apr 22, 2016 7:58 pm 
Offline
Big Block
User avatar

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
The "engine" to air filter is your PCV and that´s correct how it is.

"does it idle okay ?"

big job to retorque the heads, valve covers off, all the rockers of too.
then you have to reset all the valves afterwards.

I must say the motor looks pretty clean.


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 Post subject: Re: Loss of power
PostPosted:Fri Apr 22, 2016 8:28 pm 
Offline
Big Block
User avatar

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
Image


Bottom right on the manifold under the air cleaner, what´s the plate held down by two bolts ?
It has a pipe sticking out, looks like it needs connecting to something.......or plugging.


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