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bad miss under pressure 

 

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 Post subject: bad miss under pressure
Posted: Fri May 08, 2009 11:54 am 
Parts Gopher
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Age: 57

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Joined: 23rd Mar 2009

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Ride: 1994 EF

Location: Burnie
TAS, Australia

Hi
My son has a 347 Stroker with clevo heads in my Falcon and every time the engine gets to normal operational temperature it breaks down in spark and develops a bad miss under pressure, all thru the rev range.
The leads have been replaced, it’s got a Pro-Comp Ignition & new NGK plugs, 650 Holley Vac’ 289 Torker Manifold. C4 Auto, ‘9’ Diff,
I don’t know what the motor is out of or how old it is,
Could I need higher Temp’ plugs?
Doesn’t miss a beat when under normal operating temp & pressure

 

 

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 Post subject: Re: bad miss under pressure
Posted: Fri May 08, 2009 2:14 pm 
Oompa Loompa
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Location: Melbourne
VIC, Australia

devondevil wrote:
it’s got a Pro-Comp Ignition

I'd say that's your problem right there. Pro-comp makes some pretty poor quality stuff. Some people do alright with them but they don't hold a candle to a proper high performance setup like MSD, ICE etc.
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 Post subject: Re: bad miss under pressure
Posted: Fri May 08, 2009 4:31 pm 
Parts Gopher
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Age: 57

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Joined: 23rd Mar 2009

Gallery: 5 images

Ride: 1994 EF

Location: Burnie
TAS, Australia

hi
ChunksNensja
Son said thanks for your reply & suggestion

Whats he's options replacing he's Pro- comp with ice when he doesn't know what cam size he's running?
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 Post subject: Re: bad miss under pressure
Posted: Fri May 08, 2009 5:44 pm 
Moderator
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Ride: ford falcon au3 xr8

Location: a shit suburb in sydney
NSW, Australia

i previously had a similar issue with a pro comp ignition that was fitted to a chrysler v8..
and while they look fancy my ignition module only lasted about 8 months then it started to miss under load..
so i replaced it with a std one and the car actually performed better...
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 Post subject: Re: bad miss under pressure
Posted: Mon May 11, 2009 3:14 pm 
Parts Gopher
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Age: 57

Posts: 98

Joined: 23rd Mar 2009

Gallery: 5 images

Ride: 1994 EF

Location: Burnie
TAS, Australia

thanks to

ChunksNensja & TROYMAN
Sounds good to us
We will be following your advice
keep up the good work
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