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Subject:
Re: Backfiring (Update)
From: Diode <me(at)aintgonnatellya.com>
Subject: Re: Backfiring (Update)
Lines: 18
Date: Mon, 07 Jun 2004 04:44:48 GMT
NNTP-Posting-Host: 24.47.238.100
________________________________________________
Robotron Tom spoke thusly...
> Try:
> http://vettes.com/Parts/Parts_1.asp?catid=78&subid=376
> http://www.corvetteparts.com/catalog/0205059/1.htm
> http://www.cranescorvette.com/new_page_86.htm
>
Tom:
Thanks, but no good. The closest thing is for a 69 350 motor. Aarg...
--
-|>|- Diode -|<|-
`68 L-79 Coupe
`79 Triumph Bonneville
Shut up, dave.
Professional driver on a closed course. Do not attempt.
Actual mileage may vary.
From: Diode <me(at)aintgonnatellya.com>
Subject: Backfiring
Lines: 32
Date: Sat, 05 Jun 2004 03:00:52 GMT
NNTP-Posting-Host: 24.47.238.100
________________________________________________
OK, I have had this car a year and 3 days now. Little by little I`m
getting things done. However, there`s 2 problems that haven`t gone away
(yet). One of them is backfiring when I get off the gas. It`s the
worst when I`m really winding it out. between each gear, POP! POP!
POP!. Usually it means that air is getting sucked into the exhaust
system pretty far upstream. The connection of the exhaust pipes to the
manifolds is solid and the pipes are brand new. Any ideas? The only
thing that I`ve come up with is a partially malfunctioning diverter
valve on the AIR system. It`s backfiring on both sides and the diverter
valve is common to both I know the valve is at least partially working
because I can feel air blowing out of the muffler on the valve if I open
the throttle and let it snap closed. The part I don`t know (yet) is if
it`s COMPLETELY blocking the air flow to the manifolds on decel. If I
have time this weekend, I`m going to disconnect and plug the AIR hoses
at the check valves. If the problem stops, then I know that the
diverter valve needs help. If it doesn`t stop, then I`m totally lost..
Next problem, breaking up. When a full tune up didn`t fix the
problem, I thought for sure the new carb would. Didn`t. What the hell
is left? I haven`t changed the coil (yet). It just doesn`t sound like
a coil problem. It doesn`t break up until I hit 5,000 RPM, which sux
because it makes max power at 5,500 RPM. That being said, I`m replacing
the coil because it`s the only thing left. Again, any ideas? I was
going to get one of those higher voltage coils from Corvette Central (40
KV). The blurb says that it "fits the stock bracket". Does anybody
know if it fits under the shielding cover? Thanks gentlemen.
--
-|>|- Diode -|<|-
`68 L-79 Coupe
`79 Triumph Bonneville
Shut up, dave.
Professional driver on a closed course. Do not attempt.
Actual mileage may vary.
From: 194377`n`1Z37W2 <please_no_emails(at)myaddy.com>
Subject: Re: Backfiring
Date: Fri, 04 Jun 2004 23:58:32 -0700
Mail-Copies-To: nobody
Lines: 21
________________________________________________
In article <EHawc.37$c76.238282(at)news4.srv.hcvlny.cv.net>,
Diode <me(at)aintgonnatellya.com> wrote:
> Next problem, breaking up. When a full tune up didn`t fix the
> problem, I thought for sure the new carb would. Didn`t. What the hell
> is left? I haven`t changed the coil (yet). It just doesn`t sound like
> a coil problem. It doesn`t break up until I hit 5,000 RPM, which sux
> because it makes max power at 5,500 RPM. That being said, I`m replacing
> the coil because it`s the only thing left. Again, any ideas? I was
> going to get one of those higher voltage coils from Corvette Central (40
> KV). The blurb says that it "fits the stock bracket". Does anybody
> know if it fits under the shielding cover? Thanks gentlemen.
By breaking up, do you mean that it misses at high rpm`s? Seems I recall
reading something on the lines of it could be weak centrifugal advance
springs or the weights are too heavy and swinging out prematurely
throwing off the timing. It may be a distributor problem...
Here`s waving to ya - ||||
Owen
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