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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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