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 Post subject: Miss fire under load
PostPosted:Sat Mar 07, 2015 8:26 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
hi all,
Well today the car has developed a misfire under load :x its that bad I get pop backs in the exhaust.
Before I start off a bit of engine info will help. 327 standard engine with an edelbrock carb and HEI ignition.
A few weeks back I stripped and cleaned the carb, so my initial thoughts was "what have I done wrong", I have stripped the carb down again and nothing is wrong there.
My next move was to the dizzy, pulled it out the car and checked the coil resistance and all other stuff I could, nothing wrong there either.
I still need to check plug wire resistance which I will do in the morning.

Has anyone had this or can anyone think of something I might need to check?

Thanks in advance

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Remember the days when sex was safe and car racing was dangerous.......


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Miss fire under load

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 Post subject: Re: Miss fire under load
PostPosted:Sat Mar 07, 2015 9:36 pm 
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Big Block

Joined:Wed Jul 15, 2009 6:48 pm
Posts:493
Car Details:68 pontiac firebird coupe project car,my aim is a street friendly,lightly modified pro.touring style.
Lowered ,mild body mods,400 cu in SBC engine, Muncie 4speed, 10 bolt posi axle,disc front drum rear.
68 firebird convertible ( long term project) Stock resto/mod style ,400 pontiac th350
Might be worth checking your vacuum advance is working correctly .
Or sometimes the electrics in the HEI can start to fail and give strange symptoms before they fail ...
the cap on the HEI can also cause trouble, check the condition of the pick ups inside and if the is any doubt buy a new cap, sometimes an easy fix.
Has the HEI position slipped ? Could be a timing issue .
GOOD LUCK :thumbup:


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 Post subject: Re: Miss fire under load
PostPosted:Sat Mar 07, 2015 10:10 pm 
Offline
Big Block

Joined:Tue Jun 17, 2014 7:23 pm
Posts:86
Car Details:1967 Camaro 327
Location:Hannover Germany
I could not wait till tomorrow to check the plug wires so decided to run in the garage and check them.

I am getting a lot of different reading of them so it might be time for some new leads. I don't think this will fix the problem but they need doing any way so might as well

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 Post subject: Re: Miss fire under load
PostPosted:Sun Mar 08, 2015 8:56 am 
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Big Block
User avatar

Joined:Sat Jun 28, 2014 6:55 pm
Posts:808
Location:Croxley Green, Hertfordshire
What firebird said

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1997 30th Anniversary SS SLP
1993 GMC Typhoon


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 Post subject: Re: Miss fire under load
PostPosted:Sun Mar 08, 2015 3:07 pm 
Offline
Big Block

Joined:Tue Jun 17, 2014 7:23 pm
Posts:86
Car Details:1967 Camaro 327
Location:Hannover Germany
Update.

I have found a good deal on a complete dizzy with cap, rotor and leads here in Germany so I have gone for that. The reason I have done this is having some spares cannot hurt.

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Remember the days when sex was safe and car racing was dangerous.......


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 Post subject: Re: Miss fire under load
PostPosted:Thu Mar 12, 2015 7:29 pm 
Offline
Big Block

Joined:Tue Jun 17, 2014 7:23 pm
Posts:86
Car Details:1967 Camaro 327
Location:Hannover Germany
New spark plug leads and distributed and the car is running better then it ever has. :clap:
Now that the engine is running sweet I have noticed the fuel pump making a noise, now this raises a question should it be that noisy.
Is it normal to hear the fuel pump? :crazy:

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Remember the days when sex was safe and car racing was dangerous.......


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 Post subject: Re: Miss fire under load
PostPosted:Fri Mar 13, 2015 8:18 am 
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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
I don't think you should hear the fuel pump at all on a small block.. it's a relatively cheap part so worth replacing...

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 Post subject: Re: Miss fire under load
PostPosted:Fri Mar 13, 2015 12:29 pm 
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Big Block
User avatar

Joined:Tue Feb 23, 2010 12:40 pm
Posts:3245
Car Details:'79 Camaro, 350 V8
Location:South Bucks
Do you have an aftermarket electric fuel pump, or is it the stock mechanical one?

If it's electric then usually you can hear them when the ignition is on (but not the engine). My '79 has an aftermarket electric pump and you can hear it. My '87 has a stock electric one and you can also hear it.

If it's mechanical, then as Stu says, shouldn't be able to and luckily it's a relatively inexpensive piece to change out. Keep us updated, glad to hear it's running well after the recent service you did :thumbup:

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 Post subject: Re: Miss fire under load
PostPosted:Fri Mar 13, 2015 4:49 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
Standard mechanical fuel pump fitted to this old girl, she is an old fashioned girl that likes the simple life ;)
Another cost :o
The wife is going to kill me as I have spent a lot the last couple of months. :cry:
Oh well time to find a fuel pump :thumbup:
Does anyone have any suppliers in the uk so I can cross check with the prices here?

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Remember the days when sex was safe and car racing was dangerous.......


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 Post subject: Re: Miss fire under load
PostPosted:Fri Mar 13, 2015 5:06 pm 
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Big Block
User avatar

Joined:Sat Jun 28, 2014 6:55 pm
Posts:808
Location:Croxley Green, Hertfordshire
When buying parts for cars always remember this--- it's always easier to seek forgiveness than permission

Real steel in Uxbridge would sell them

_________________
1997 30th Anniversary SS SLP
1993 GMC Typhoon


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