85 RX-7 12A Power Loss

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CarGuru > Open discussion > 85 RX-7 12A Power Loss 14 April 2005 01:04:17

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85 RX-7 12A Power Loss
John 2 April 2005 06:57:17
	Hi everyone, My 85 RX-7 12A 5spd has a problem that I'm having a hard time troubleshooting. A few minutes after I start to drive the car on a cold and/or wet day, the engine loses power. It can't even sustain 50MPH on the highway. The engine runs okay (it sometimes bucks a little), but it lacks power. When this happens, I usually pull off the road, and the car idles just fine on the side of the road. After a minute or two of idling, the car usually runs fine for the rest of my trip. Any thoughts? The problem has gone on for several years, but now it is annoying me enought that I want to fix it. I have already replaced both ignition coils, swapped ignitors, and replaced the spark plugs. Thanks for your help. John
		Add comment


Gord Beaman 2 April 2005 07:32:19 [ permanent link ]
	"John" <jfport@mindspring.com> wrote: Hi everyone,>My 85 RX-7 12A 5spd has a problem that I'm having a hard time >troubleshooting. A few minutes after I start to drive the car on a cold >and/or wet day, the engine loses power. It can't even sustain 50MPH on the >highway. The engine runs okay (it sometimes bucks a little), but it lacks >power. When this happens, I usually pull off the road, and the car idles >just fine on the side of the road. After a minute or two of idling, the car >usually runs fine for the rest of my trip.> Any thoughts? The problem has gone on for several years, but now it is >annoying me enought that I want to fix it. I have already replaced both >ignition coils, swapped ignitors, and replaced the spark plugs.> Thanks for your help.> John > You change the wires John?...I had two RX-7's, An 83 and an 85, they had very high voltage ignition systems and gave a lotta grief whenever it was damp...I'd go through a puddle and the damned engine'd take a snooze...I finally carried a can of WD-40...spray the wires and it'd catch and run fine...WD-40 will burn so be careful...another problem that I had was dirty fuel filter...musta got some dirty gas cause it'd plug the fuel filter every now and then...good luck, fun little car when they're working good... -- -Gord. (use gordon in email)
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Robert Mabee 2 April 2005 19:44:32 [ permanent link ]
	Gord Beaman wrote:> "John" <jfport@mindspring.com> wrote:>> A few minutes after I start to drive the car on a cold >>and/or wet day, the engine loses power. You change the wires John? Isn't there a dual distributor in that setup? If new wires doesn't fix it, replace the distributor cap. Condensation can make it more likely to arc along internal lines left carbonized by prior arcing.
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Gord Beaman 2 April 2005 20:45:37 [ permanent link ]
	Robert Mabee <rmabee@comcast.net> wrote: Gord Beaman wrote:>> "John" <jfport@mindspring.com> wrote:>>> A few minutes after I start to drive the car on a cold >>>and/or wet day, the engine loses power.> You change the wires John?> Isn't there a dual distributor in that setup? If new wires doesn't>fix it, replace the distributor cap. Condensation can make it more>likely to arc along internal lines left carbonized by prior arcing. I don't think there's two Robert, I had two RX-7's and I can't remember for sure (has two coils though). I do remember fixing it when it quit on the road (very damp cold day) and wouldn't start...I washed out the dist. cap with WD-40, a rag and a screwdriver...started instantly and ran fine for months after. So your tip is likely a good one. The ignition voltage is very high in those, they're very hard on ignition components. -- -Gord. (use gordon in email)
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Michael C 3 April 2005 13:43:34 [ permanent link ]
	"Gord Beaman" <gord@islandtelecom.com> wrote in message news:89it4156962kktrog4otvjp81cq1dpf156@4ax.com...> I don't think there's two Robert, I had two RX-7's and I can't> remember for sure (has two coils though). I don't think the RX7s ever had the twin dizzy engine. Michael
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The Raven 3 April 2005 14:57:20 [ permanent link ]
	"Michael C" <mike@nospam.com> wrote in message news:424fbab6$0$5594$afc38c87@news.optusnet.com.au...> "Gord Beaman" <gord@islandtelecom.com> wrote in message > news:89it4156962kktrog4otvjp81cq1dpf156@4ax.com...>> I don't think there's two Robert, I had two RX-7's and I can't>> remember for sure (has two coils though).> I don't think the RX7s ever had the twin dizzy engine. True, the twin distributors last appeared in the 10A and 12A engines found in some RX-2 and RX-3 models. IIRC the 12A twin distributor was last seen in RX-2's (had one myself on a "top starter" engine). Last 10A I rebuilt was sold to a guy to go into his RX-3. -- The Raven http://www.80scartoons.co.uk/batfinkquote.mp3 ** Now I will bring chaos to the world!
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Michael C 3 April 2005 16:39:28 [ permanent link ]
	"The Raven" <swilson150@yahoo.com.au> wrote in message news:424fcc15$0$11236$afc38c87@news.optusnet.com.au...> True, the twin distributors last appeared in the 10A and 12A engines found > in some RX-2 and RX-3 models. IIRC the 12A twin distributor was last seen > in RX-2's (had one myself on a "top starter" engine). Last 10A I rebuilt > was sold to a guy to go into his RX-3. Funny thing with those top starters is that the latest engines still have the hole in the rear plate today. Well, I know it was true for the rx7s but I'm not certain about the rx8s. I'd be interested to know mazdas reasoning behind this, maybe it's for racing? Michael
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Michael C 3 April 2005 16:49:55 [ permanent link ]
	"The Raven" <swilson150@yahoo.com.au> wrote in message news:424fe498$0$30456$afc38c87@news.optusnet.com.au...> Left over casting but the top starters will not bolt on to the later > engines. If anything, it aids ventilation. Take a look at how serious > Mazda thought it was when they did the 12A turbo "smooth case" gearbox. > Huge air vents in the side of the bell housing. What stops them bolting up, is it the flywheel is in a different spot? Michael
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Amur_ 7 April 2005 20:10:55 [ permanent link ]
	Gord Beaman wrote: I finally carried a can of> WD-40...spray the wires and it'd catch and run fine Hairspray also does an excellent job of temporarily 'sealing' wires. Any progress with this yet, John? ttyl, Amur_
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Michael C 9 April 2005 10:53:25 [ permanent link ]
	"The Raven" <swilson150@yahoo.com.au> wrote in message news:42511b88$0$5597$afc38c87@news.optusnet.com.au...> Been a decade or two since I looked at it but I think the flywheel was > different, the bellhousing, and the starter no longer fits over the engine > without fouling on things. So if I relocate the huge amount of crap off the top of the engine, cut a hole in the bellhousing and space out the flywheel it should bolt straight up. Michael
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The Raven 9 April 2005 13:42:49 [ permanent link ]
	"Michael C" <mike@nospam.com> wrote in message news:42577bd9$0$28845$afc38c87@news.optusnet.com.au...> "The Raven" <swilson150@yahoo.com.au> wrote in message > news:42511b88$0$5597$afc38c87@news.optusnet.com.au...>> Been a decade or two since I looked at it but I think the flywheel was >> different, the bellhousing, and the starter no longer fits over the >> engine without fouling on things.> So if I relocate the huge amount of crap off the top of the engine, cut a > hole in the bellhousing and space out the flywheel it should bolt straight > up. Don't think so. I vaguely recall the bellhousing also having a raised section for the starter snout.... You could try to go top starter but I don't see the point. While you're at it you could also go twin distributor and gear driven oil pump....don't forget the dual side seals for authenticity. -- The Raven http://www.80scartoons.co.uk/batfinkquote.mp3 ** Now I will bring chaos to the world!
		Add comment


David Gourley 13 April 2005 22:31:39 [ permanent link ]
	"John" <jfport@mindspring.com> news:hSn3e.10304$z.4419@newsread2.news.atl.earthlink.net: Hi everyone,> My 85 RX-7 12A 5spd has a problem that I'm having a hard time > troubleshooting. A few minutes after I start to drive the car on a> cold and/or wet day, the engine loses power. It can't even sustain> 50MPH on the highway. The engine runs okay (it sometimes bucks a> little), but it lacks power. When this happens, I usually pull off> the road, and the car idles just fine on the side of the road. After> a minute or two of idling, the car usually runs fine for the rest of> my trip. > Any thoughts? The problem has gone on for several years, but now it> is annoying me enought that I want to fix it. I have already replaced> both ignition coils, swapped ignitors, and replaced the spark plugs.> Thanks for your help.> John > I've had conditions like this occur when baffles were letting go in the muffler and clogging the exhaust. Easy enough -if you can get it loose and shake it, you'll have your answer pretty fast. My guess is either that or a vacuum leak. luck, david
		Add comment


Gord Beaman 14 April 2005 01:04:17 [ permanent link ]
	david gourley <davidg.nospam.news@verizon.net> wrote: "John" <jfport@mindspring.com>>news:hSn3e.10304$z.4419@newsread2.news.atl.earthlink.net: > Hi everyone,>> My 85 RX-7 12A 5spd has a problem that I'm having a hard time >> troubleshooting. A few minutes after I start to drive the car on a>> cold and/or wet day, the engine loses power. It can't even sustain>> 50MPH on the highway. The engine runs okay (it sometimes bucks a>> little), but it lacks power. When this happens, I usually pull off>> the road, and the car idles just fine on the side of the road. After>> a minute or two of idling, the car usually runs fine for the rest of>> my trip. >> Any thoughts? The problem has gone on for several years, but now it>> is annoying me enought that I want to fix it. I have already replaced>> both ignition coils, swapped ignitors, and replaced the spark plugs.>> Thanks for your help.>> John >> I've had conditions like this occur when baffles were letting go in the >muffler and clogging the exhaust. Easy enough -if you can get it loose >and shake it, you'll have your answer pretty fast.> My guess is either that or a vacuum leak.> luck,>david I had an 85 RX-7 new and also an 83 new, I found that the ignition was very susceptible to wet and had occasionally exactly the same problem...carry a can of WD-40 and blast the wires now and then, you might wash out the dist.caps with it too... -- -Gord. (use gordon in email)
		Add comment

CarGuru > Open discussion > 85 RX-7 12A Power Loss 14 April 2005 01:04:17

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85 RX-7 12A Power Loss

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