Vacuum pressure?
01-29-12, 09:17 PM
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Vacuum pressure?
Hi, my name is devan and I've had my 1983 rx7 since dec. 25, 2011. One day out of the blue it starts running like crap and no one I know can figure out why. I just did a vacuum pressure test and it fluctuates between 12-17 lbs. at 1000rpms. Does anyone by chance know what the problem might be and what the standard pressure is? Any help would be much appriciated. Thanks.
02-10-12, 05:40 PM
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ok so we found out that the vacuum is supposed to be at 17 to 18. my problem now is that i cant find the leak. ive checked all of the hoses that i can get to and i cant find any that are damaged. Does anyone know where it might be?
02-10-12, 11:29 PM
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Bad shutter value?
https://www.rx7club.com/showthread.p...ht=vacuum+leak
Also check your Anti-Afterburn Valve to Intake Manifold Hose:
http://www.mazdatrix.com/C-5.HTM
https://www.rx7club.com/showthread.p...ht=vacuum+leak
Also check your Anti-Afterburn Valve to Intake Manifold Hose:
http://www.mazdatrix.com/C-5.HTM
02-15-12, 02:18 PM
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Vacuum will change with rpm and throttle opening. Vacuum will also change with compression/mileage. 16-20 would be for a very healthy engine, while 12-15 would be "normal" for a more high mileage/weaker compression engine. You may not even HAVE a vacuum leak.
02-19-12, 09:29 PM
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ive tried the the carb cleaner and ive used sea-foam as well but nothing helps. the vacuum is still down and now it will randomly bog down until it dies when im driving down the road. Im not very good with engines but pics help a lot. if anyone has had the same problem please let me know. i dont want to have to buy a whole new engine because of a damn vacuum leak if u know what i mean. any info. is helpful.
thanks guys
thanks guys
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02-22-12, 03:22 PM
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Have you replaced/checked the fuel filter?
Are you getting spark from all plugs?
Have you tried doing the "poor man's compression" test?
I would do a fuel pressure and volume test.
Have you checked your timing? (Probably not the problem if you haven't adjusted the distributor, but worth checking)
Perhaps a video of the engine running would be helpful. These are a few things I would start with.
Are you getting spark from all plugs?
Have you tried doing the "poor man's compression" test?
I would do a fuel pressure and volume test.
Have you checked your timing? (Probably not the problem if you haven't adjusted the distributor, but worth checking)
Perhaps a video of the engine running would be helpful. These are a few things I would start with.
02-22-12, 07:03 PM
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Have you replaced/checked the fuel filter?
Are you getting spark from all plugs?
Have you tried doing the "poor man's compression" test?
I would do a fuel pressure and volume test.
Have you checked your timing? (Probably not the problem if you haven't adjusted the distributor, but worth checking)
Perhaps a video of the engine running would be helpful. These are a few things I would start with.
Are you getting spark from all plugs?
Have you tried doing the "poor man's compression" test?
I would do a fuel pressure and volume test.
Have you checked your timing? (Probably not the problem if you haven't adjusted the distributor, but worth checking)
Perhaps a video of the engine running would be helpful. These are a few things I would start with.
1. How are you testing spark from the plugs.
2. More importantly, how do you do a poor man's compression test besides spraying carb cleaner all over the place.
Thanks.
03-09-12, 09:48 PM
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it idles anywhere from 750 to 1000 but its rough. i would take a video but u cant tell unless im driving and driving a stick and working a phone isnt an easy task. i bought a new fuel pump and carb rebuild kit. hopefully it will help. if not well then im at another dead end.
03-26-12, 04:35 PM
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ok we fixed the random dying and it was the fuel pump. havent done the carb kit yet but hope to very soon. i was wondering if anyone knows where to get stock body parts for the 83 rx7 gsl cheap. ive looked but cant find anything.
03-26-12, 04:41 PM
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ok so we replaced the fuel pump and it doesnt randomly die anymore. i was wondering if anyone knows where to get stock body parts for my car. any info is helpful
04-08-12, 09:00 PM
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ok so im guessing most of you guys who have an rx7 know how to tune the carb. well i dont. the other day i was pulling my car in the garage and my step dad was like smells like its running rich. i dont know exactly what that means or how to fix it. if anyone can give me some guidence on what to do that would be great. thanks.
04-15-12, 07:24 PM
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just found out that the nikki is self adjusting? dont know how accurate that is but hey, pretty cool. concidering my car is 28 years old and has all of the stock stuff on it such as belts, i think my timing belt is going out. if that isnt the right term im talking about the belt on the front of the engine that turns all the gizmos and what not. ive been trying to find one on the internet but i cant find anything. it will randomly make a low pitched squeeling noise and once again....it is completely random.
. i have tried to get it to make the noise so i can pop the hood and see if thats the problem but it wont do it until im driving and then when i rev the engine to 3000rpms it goes away and MIGHT come back. if anyone knows of some cheap not extremely difficult things to get my car running faster like just some little things i would GREATLY appreciate it.
Thanks
Devan
. i have tried to get it to make the noise so i can pop the hood and see if thats the problem but it wont do it until im driving and then when i rev the engine to 3000rpms it goes away and MIGHT come back. if anyone knows of some cheap not extremely difficult things to get my car running faster like just some little things i would GREATLY appreciate it.Thanks
Devan
08-09-12, 08:59 PM
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ok so im looking to replace the nikki with something better and less hassle. the master plan is to but a 13b turbo from and 88' in and have an 8.8 rear end. i want to replace the nikki because i need to save up some money before i can do the entire swap. anyone how wants to post things that i need to do in advance to make the job easier like things i need to buy just post it. i appreiceate the help everyone.
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