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Old 11-01-13, 11:53 AM   #1
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83 12A wont start.

Hello, my 83 Rx-7 won't start. It was running rich for a while but now it won't turn over. I replaced all spark plugs/wires. Cleaned the Carb replaced the fuel filter. Occasionally it will turn over then shut off after two seconds. It has a aftermarket Holley Carb. Any ideas would be helpful.
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Old 11-01-13, 02:45 PM   #2
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Hmmmm. All I can recommend is a stock manifold and Nikki carb. Cuz I know they work. Better than Holley, which I had.
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Old 11-01-13, 03:53 PM   #3
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welcome to the board.

you should provide more information on the carburetor itself and the fuel supply. any signs of flooding? also, you mentioned it ran rich, how was idle and driving?
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well its track only because to drive it on the street i need a smog, and that's not happening, i had visions, but i'm not sure it'll even pass in my imagination anymore.
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plus if you ever hit a guardrail there would be no need for a coffin just weld some handles on the side and wallah (sp.). (voila!)
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Old 11-02-13, 12:37 PM   #4
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welcome to the board.

you should provide more information on the carburetor itself and the fuel supply. any signs of flooding? also, you mentioned it ran rich, how was idle and driving?
The Carb itself I have no idea. It reads Holley 6R. it has a fuel cell in the trunk and I've been trying to use 93 non ethanol, which in Iowa is really hard to get non ethanol, and it has been flooding about every other week. Idle was fine I got it to run steady at 800rpm. I read the it should be around 500-800 normally. As well as driving, it was a challenge. The car (I named Meg) either wants pedal to the floor to move or a light pressure but if I went in between she would shutter and she would die.
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Old 11-02-13, 12:40 PM   #5
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Hmmmm. All I can recommend is a stock manifold and Nikki carb. Cuz I know they work. Better than Holley, which I had.
I would love to convert it back for various reasons, I would know what it is, plenty of information on them, easy to service for most the problem is I cannot find any. I have what I believed to be one but it looks different then what I've looked up.
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Old 11-02-13, 01:00 PM   #6
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Agitosan
Can you throw on a pic of the one that looks different? Worst case I can probably dig through my parts and find one for ya, but that's worst case.
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Old 11-02-13, 05:15 PM   #7
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Here are some

83 12A wont start.-forumrunner_20131102_171357.jpg



83 12A wont start.-forumrunner_20131102_171442.jpg



83 12A wont start.-forumrunner_20131102_171503.jpg
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Old 11-02-13, 08:04 PM   #8
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The Carb itself I have no idea. It reads Holley 6R. it has a fuel cell in the trunk and I've been trying to use 93 non ethanol, which in Iowa is really hard to get non ethanol, and it has been flooding about every other week. Idle was fine I got it to run steady at 800rpm. I read the it should be around 500-800 normally. As well as driving, it was a challenge. The car (I named Meg) either wants pedal to the floor to move or a light pressure but if I went in between she would shutter and she would die.
I am having just about the same problem. At full throttle and around 40% and more, it runs good but, at part, but not light, it has just about no power as it, it just about comes to a stop, but, at light throttle, it does ok with some hiccuping though.

I was told that it may be a possible cracked apex seal.
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Old 11-02-13, 08:14 PM   #9
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Here are some
that's not a carburetor you posted. that's a Gen II throttle body.
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well its track only because to drive it on the street i need a smog, and that's not happening, i had visions, but i'm not sure it'll even pass in my imagination anymore.
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Originally Posted by OZZYINCALI View Post
plus if you ever hit a guardrail there would be no need for a coffin just weld some handles on the side and wallah (sp.). (voila!)
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Old 11-02-13, 08:15 PM   #10
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I am having just about the same problem. At full throttle and around 40% and more, it runs good but, at part, but not light, it has just about no power as it, it just about comes to a stop, but, at light throttle, it does ok with some hiccuping though.

I was told that it may be a possible cracked apex seal.
check your timing.
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Quote:
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well its track only because to drive it on the street i need a smog, and that's not happening, i had visions, but i'm not sure it'll even pass in my imagination anymore.
Quote:
Originally Posted by OZZYINCALI View Post
plus if you ever hit a guardrail there would be no need for a coffin just weld some handles on the side and wallah (sp.). (voila!)
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Old 11-02-13, 09:37 PM   #11
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check your timing.
will do. replaced hoses to carb too.

Thanks!
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Old 11-03-13, 05:55 AM   #12
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that's not a carburetor you posted. that's a Gen II throttle body.
Is that even possible to put on my car?
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Old 11-03-13, 06:01 AM   #13
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So possible cracked apex seal, timing, replace Carb hoses. I will look into that today. Random question. What is the best gas to use? Im using 93 octane without ethanol but that's hard to find in Iowa. Only two locations sell it without. Will ethanol hurt a motor this old/style?
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Old 11-03-13, 08:14 AM   #14
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Is that even possible to put on my car?
unless you plan to go EFI, forget about using it.

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So possible cracked apex seal, timing, replace Carb hoses. I will look into that today. Random question. What is the best gas to use? Im using 93 octane without ethanol but that's hard to find in Iowa. Only two locations sell it without. Will ethanol hurt a motor this old/style?
not sure where/why we're considering cracked apex seal, but you can use a compression test if you wish.

use the regular 87. no need for 93. as for the ethanol content, as long as it's not high, you should be just fine.
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Quote:
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well its track only because to drive it on the street i need a smog, and that's not happening, i had visions, but i'm not sure it'll even pass in my imagination anymore.
Quote:
Originally Posted by OZZYINCALI View Post
plus if you ever hit a guardrail there would be no need for a coffin just weld some handles on the side and wallah (sp.). (voila!)
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Old 11-03-13, 08:17 AM   #15
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unless you plan to go EFI, forget about using it.

not sure where/why we're considering cracked apex seal, but you can use a compression test if you wish.

use the regular 87. no need for 93. as for the ethanol content, as long as it's not high, you should be just fine.
As for the gas, we have anywhere from 10%-20% and when I used it, the smell was horrible.
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Old 11-03-13, 12:37 PM   #16
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Good news! Got it running. Bad news. If I go on hills the power just cuts out. It also cuts around 3.1/2 -4 thousand rpm. Or at 30-40% throttle.
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Old 11-03-13, 12:39 PM   #17
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Here is the Holley Carb that is installed.

83 12A wont start.-forumrunner_20131103_123846.jpg



83 12A wont start.-forumrunner_20131103_123906.jpg



83 12A wont start.-forumrunner_20131103_123918.jpg
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Old 11-03-13, 04:52 PM   #18
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http://www.holley.com/data/TechServi...%20Listing.pdf

http://www.theturboforums.com/thread...-indentif-help

holley carb identification - Nova Tech

holley carb help - Hot Rod Forum : Hotrodders Bulletin Board

if you get some of the other numbers off the carb it might better help you figure out what you've got. my guess ... the carb is probably not sized or set up for your 12A.


i just noticed in all of this that you did not mention what pump and pressure you're running.
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Quote:
Originally Posted by j9fd3s View Post
well its track only because to drive it on the street i need a smog, and that's not happening, i had visions, but i'm not sure it'll even pass in my imagination anymore.
Quote:
Originally Posted by OZZYINCALI View Post
plus if you ever hit a guardrail there would be no need for a coffin just weld some handles on the side and wallah (sp.). (voila!)
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Old 11-03-13, 06:36 PM   #19
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http://www.holley.com/data/TechServi...%20Listing.pdf

http://www.theturboforums.com/thread...-indentif-help

holley carb identification - Nova Tech

holley carb help - Hot Rod Forum : Hotrodders Bulletin Board

if you get some of the other numbers off the carb it might better help you figure out what you've got. my guess ... the carb is probably not sized or set up for your 12A.

i just noticed in all of this that you did not mention what pump and pressure you're running.
I just have stock everything else. So my guess on the pressure would be stock amount. I am not 100% sure
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Old 11-03-13, 07:08 PM   #20
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ahhh ... progress, finally! this is why it's important to provide as much info as you can. you could have been on the right track many posts ago.

well, for starters, there's no way a stock pump is going to drive a Holley! hell, it's marginal for the Nikki. get something else ... something that has good FLOW and can do so at at least 7 PSI. i can vouch for Carter and Holley pumps because i have used Carter in the past myself, and my brother used a Holley on his car. you will also NEED a regulator. Holley has two popular ones that i'm aware of. one that serves 4 PSI and less and one that serves 4 PSI and more. get the latter. for what it's worth, you probably want to get a gauge, too - however finding an accurate one is not as easy as it sounds. i used a Summit gauge since i bought my pump and regulator from them. i can't speak to accuracy, but it at least seemed to react appropriately to regulator adjustments.

this is no guarantee that the car is going to run well, but it will definitely put you on the right path. make like a pistachio and get crackin'.

also, figure out what Holley you actually have or you could be in a for a long, frustrating and painful journey.
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Quote:
Originally Posted by j9fd3s View Post
well its track only because to drive it on the street i need a smog, and that's not happening, i had visions, but i'm not sure it'll even pass in my imagination anymore.
Quote:
Originally Posted by OZZYINCALI View Post
plus if you ever hit a guardrail there would be no need for a coffin just weld some handles on the side and wallah (sp.). (voila!)

Last edited by diabolical1; 11-03-13 at 07:14 PM.
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Old 11-04-13, 01:25 PM   #21
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ahhh ... progress, finally! this is why it's important to provide as much info as you can. you could have been on the right track many posts ago.

well, for starters, there's no way a stock pump is going to drive a Holley! hell, it's marginal for the Nikki. get something else ... something that has good FLOW and can do so at at least 7 PSI. i can vouch for Carter and Holley pumps because i have used Carter in the past myself, and my brother used a Holley on his car. you will also NEED a regulator. Holley has two popular ones that i'm aware of. one that serves 4 PSI and less and one that serves 4 PSI and more. get the latter. for what it's worth, you probably want to get a gauge, too - however finding an accurate one is not as easy as it sounds. i used a Summit gauge since i bought my pump and regulator from them. i can't speak to accuracy, but it at least seemed to react appropriately to regulator adjustments.

this is no guarantee that the car is going to run well, but it will definitely put you on the right path. make like a pistachio and get crackin'.

also, figure out what Holley you actually have or you could be in a for a long, frustrating and painful journey.
Thank you so much for your help. Im looking into a new pump and regulator. Hopefully it works out. Any good forums about timing? I want to make sure that is out of the equation.
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Old 11-04-13, 02:36 PM   #22
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get a timing light if you don't already have one. i know AutoZone will allow you to borrow tools, so you shouldn't have that you have to buy one, unless you just want to. check the timing with it. i know the old RB catalog had a timing recommendation chart, if i recall. since everything is online, i suspect you should be able to find it on their site.

most questions you have should be able to be addressed in the Gen I forum.
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Quote:
Originally Posted by j9fd3s View Post
well its track only because to drive it on the street i need a smog, and that's not happening, i had visions, but i'm not sure it'll even pass in my imagination anymore.
Quote:
Originally Posted by OZZYINCALI View Post
plus if you ever hit a guardrail there would be no need for a coffin just weld some handles on the side and wallah (sp.). (voila!)
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Old 11-04-13, 08:21 PM   #23
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Found this. Not a bad price at all. I believe this should be enough. http://www.holley.com/12-802-1.asp
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Old 11-12-13, 07:22 PM   #24
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http://www.racingbeat.com/manuals/timingchart.pdf
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Old 11-18-13, 01:32 PM   #25
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The standard pump on the 12A's is completely useless. I'm having almost the same problems as you, and I'm even running a nikki.

I can't really see any other carbies running with this POS pump, hell, my current one can hardly pump against gravity. I've got a universal Bosch one that I'm going to drop in some time tonight or tomorrow or something, hopefully it'll make a difference.
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Old 11-18-13, 01:32 PM
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