Engine misfire
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Engine misfire
Posted: May 27 2007 04:18 PM
 
Gene Riffe (aka hotrodgene) [ View ] [ genejanice@verizon.net ] [ Car Ads ] [ Blogs ]
Saint Petersburg, Florida
(727) 522-9856
 Gene Riffe
 
I just started having this misfire and sounds like plug wires crossed.Eng.will pop and backfire thru exhause.I just completed a 2500 mile trip and all was fine and no change has been made to eng.I do find if I disconnect vac.advance hose all is fine.I took out vac. advance and attached to vac.source and it pulls in fine and not leak down.Could it be a cap?It has the electronic dist.with coil in cap.I have run with vac disconnected and all is good as far as backfire.Help
 
 
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Posted by Streetrodder007  -  05/27/2007 06:09 PM
Run on and misfire always usually point to ignition problem. Start with checking the timing, then I would do a new cap and rotor / and new plugs - that could be a cheap fix. Lastly I would change wires. Good luck
Streetrodder007 [ View ] [ Email ] [ Blogs ] [ Car Ads ] Port Huron, Michigan Charter Member since April 2006
 
Posted by DavyJ  -  05/27/2007 08:18 PM
Had a similar problem come in a while ago, turned out the coil was only getting 5 volts due to a corroded wire, it would run ok then screw up. I messed with the timing for a while before finding the bad wire.
Still driving the wife's car, cause I am slow. [ View ] [ Email ] [ Blogs ] [ Car Ads ] Niagara Falls, Canada Charter Member since February 2005
 
Posted by hotrodgene  -  05/27/2007 10:30 PM
Thanks to all for suggestions,this car run great by just disconnecting vac.advance.So to me that would elimate the plugs,wires,coil etc.this car also has a crossfire cap and I am wandering about that.I believe when vac.advances it is firing between two cyls.since it back fires and pops thru exhaust.with no vac.run fine.I do know with points and this occurs it was all ways the point settings or replace points.Thanks
Gene Riffe [ View ] [ Email ] [ Blogs ] [ Car Ads ] Saint Petersburg, Florida
 
Posted by koolstuff0099  -  05/28/2007 07:56 AM
Although I myself never used a crossfire type cap, my friend did and had trouble with it. I'd consider going to a stock cap. Just for the ease of replacement during a out of town trip would convince me to change. This aint no answer..........., just my nosey 2 cents worth. Please let us all know what it was, when you do find it. DavyJ has a good point too.....................................................Good luck
Koolstuff [ View ] [ Email ] [ Blogs ] [ Car Ads ] Newburyport, Massachusetts
 
Posted by kadjjd  -  05/28/2007 08:47 AM
You might look at the pigtail wire inside the distributor...it could be broken or the insulation might be damaged. It would seem to me the vac advance is making the dist plate move and that is when you notice the problem...when you disconnect the vac advance the dist plate doesn't move...no problem. Just a suggestion from an old timer.
Buy a Buick, they got plenty power. [ View ] [ Email ] [ Blogs ] [ Car Ads ] La Luz, New Mexico
 
Posted by Crazyhorse Rod Shop  -  05/28/2007 09:11 AM
try backing the timing down 2 degrees.
dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003
 
Posted by JAWS  -  05/28/2007 09:50 AM
sounds like the mechanical advance is stuck. Too much advance will make it pop out the exhuast.
An electrical headache can make a great car a pain [ View ] [ Email ] [ Blogs ] [ Car Ads ] Boise, Idaho Charter Member since August 2004
 
Posted by Crazyhorse Rod Shop  -  05/28/2007 10:00 AM
brant, he disconnected the advance and it ran ok. i think it's advanced too much.
dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003
 
Posted by Crazyhorse Rod Shop  -  05/28/2007 12:59 PM
sorry brant, did'nt snap to " mechanical " duh. could very well be. looks like a take me apart any way you go.
dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003
 
Posted by Paradise Road Rod & Custom  -  05/28/2007 09:17 PM
I would take a look a at the pick up. they were known to have problems as you have described. and taking the advance away from the dist. would confirm the problem. the vacuum advance is connected to the pick up coil. sounds like its breaking down after it gets hot.

Tim
Paradise Road Rod & Custom [ View ] [ Email ] [ Blogs ] [ Car Ads ] Indianapolis, (unknown state)
 
Posted by hotrodgene  -  05/29/2007 11:04 AM
If it were the pickup why would it run good by disconnecting vac.source?Think I will just give up and install new dist.Thanks all
Gene Riffe [ View ] [ Email ] [ Blogs ] [ Car Ads ] Saint Petersburg, Florida
 
Posted by Paradise Road Rod & Custom  -  05/29/2007 11:30 AM
Because under load/ vacuum. The module supplies more voltage to the pick up to componsate for the advance.Do do your know what your base timing is set at right now? or total advance? and at what RPM is the total advance coming in at . If you take your car to a local shop they can hook it up to a scope and tell you in a instant if its your primary or secondary side of your ignition system. But then again you may be right it may be just as cheap to by a new unit.

Tim
Paradise Road Rod & Custom [ View ] [ Email ] [ Blogs ] [ Car Ads ] Indianapolis, (unknown state)
 
Posted by hotrodgene  -  06/03/2007 07:30 PM
Don't know what problem was but I installed a new complete MSD dist.and problem I was having is gone.Just to try I replaced the cross fire cap and no help.Cost 200.00 but don't have this problem anymore.
Gene Riffe [ View ] [ Email ] [ Blogs ] [ Car Ads ] Saint Petersburg, Florida
 
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