Ferrariferg

iTrader: (3)

Ok. I bought an 83 RX7 a few days ago and got it running ok. It has some minor issues that I can work out later but right now this is what I need to get figured out.

When I come to a stop 90% of the time the engine will sputter and die. I thought I had the problem temporarily fixed by disconnecting the brake booster which was causing a vacuum leak when I hit the brakes. Now the idle doesn't change when I pump the brakes but it still dies when I decelerate. I've checked all the lines for vacuum leaks, fuel leaks, anything. I'm pretty much at a loss. Anyone have any ideas?

Kentetsu

Try setting the idle speed and mixture according to Sterling's method: http://sterlingmetalworks.com/tuning_the_nikki.htm

If that doesn't fix the problem, then let us know.




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Ferrariferg

iTrader: (3)

I was only able to adjust the idle. It helped a bit. Now it only dies when I brake hard. I cant adjust the mixture because it has a metal cap over the screw. Any way to remove the cap without removing the carb?

Oneiros

Just rip it off with some pliers, then back the screw off a few turns, sounds like your idle is on the lean side

also what you have decsribed could be the carby icing up combined with a marginal idle. driving at moderate speeds consistently (not stop start) in cold weather will upset the carby if the air cleaner snout has had the flapper valve removed, setting the idle higher and a little richer (eg 1krpm) should prevent it dying tho. good luck.

Ferrariferg

iTrader: (3)

I adjusted the carb some more and its working a lot better. I do have a leak around the accelerator pump and it doesnt seem like its working. I'm sure its all dry and cracking from sitting so long. I'm going to try to find a carb soon that I can rebuild. Is there a difference between the years? If not then I can get the carb from the 79 thats at the junk yard. Thanks for the help everybody.

Oneiros

there are slight differences but it will bolt on to your 83 fine

Ferrariferg

iTrader: (3)

Good to know. Hopefully its still there and I can pick it up this weekend. Who sells the best rebuild kit?

tasty danish

iTrader: (5)

try letting out the clutch when you stop...

I KID I KID

sterling, that same guy you followed when adjusting the idle is a nikki god. While you're rebuilding you should
A)send it to him for some heavy performance mods
B)Rebuild it yourself but follow his instructions for making it awesome.

Bob Holton

Check the fule filter!!!!!!!!!!!!!!Bob

Oneiros

Autozone are good, sterlings site recommends the 96-555, cheap too.. They told me the manufacturers aren't makingthat model any more but there shouldbe a few here and there I guess.. I use the 96-462 but these are missing a few washersand split pins

Ferrariferg

iTrader: (3)

Fuel filter was already replaced. The old one was so bad the it was actually leaking.

I wish I had the money to send it to sterling. I went through his page and I keep reading about his work on here. I plan on cleaning up the engine as much as possible while still keeping it driveable and I want to keep the AC. It still works so no reason to get rid of it. I was also thinking about taking the whole motor from the RX-7 at the junk yard and doing a street port and a rebuild but I have another motor in the works so that will have to wait.

Thanks again for the help everyone.

BandDButton

The carb kit at Autozone that you want is like $28. I just bought one about 2 months ago, and it had everything that I needed, including the new metering ***** that Sterling talks about. I followed his write-up religiously!

Ferrariferg

iTrader: (3)

I'll definitely be following Sterlings advice when I do the rebuild. Its great to have a write-up like that. The only other carb I've rebuilt is a weber 32/36 for my dads 260Z.

I hope having a rebuilt carb will solve the problem. The car runs great and idles well. It just doesn't like to return to idle and not having a working accelerator pump can be bad when pulling out in traffic and the car dies.

tasty danish

iTrader: (5)

I understand the money issue, but you should at least convert to mech. secondaries.

Ferrariferg

iTrader: (3)

I've seen that mentioned a few times. How is that done?

I cant seem to find how to remove the rats nest. I saw something the other day but forgot to bookmark it.

BandDButton

Rats nest removal can be found in the Gen 1 FAQ thread.

Kentetsu

The mech secondary mod can be found there as well...

Ferrariferg

iTrader: (3)

So the car decided it didnt want to start anymore. I dont know what the problem is. Someone mentioned the fuel pump but I can still hear it ticking (not sure if its supposed to tick) but I figured that since it wont start I might as well take advantage of it and pull the carb and emissions stuff. The writeup for removing the rats nest is excellent. I have everything off now. I just ordered the carb rebuild kit (had to get it from the HUB). Hopefully I can get it done tonight. Its amazing how much nicer the engine looks. Now I need to make up the block off plates and clean the rest of the engine with degreaser.

Ferrariferg

iTrader: (3)

Ok. I rebuilt the carb and it ran ok but I still had the same issue then it decided to not start again. I let it sit for a day then I messed with it some and got it to run and spent the day retuning the carb and had it Idling smooth and I fixed the problem with it dieing when I stop. I needed to turn the mixture screw some more. But now it wont start again. Does anybody have any idea what could cause it to not start? It runs great when it does run but once its sat and cooled down it will just crank and try to run but it just wont start.

Oneiros

check your float levels, often the bowls flood, but if you read Sterling's guide im guessing you did his trick on the needles as well?

when starting you should pump the throttle once or twice then crank with the throttle partly open and hold it open for a while, unless you use the choke

beyond that you could check the ignition.

Kentetsu

Have you checked the timing?

Ferrariferg

iTrader: (3)

Ugh. I came home for my lunch break and decided to try to start it after it sat over night and it started up but idled really rough. I shut it off and added some coolant cause I remembered that it was a little low and then it wouldnt start. I adjusted the floats but I guess I missed the trick with the needle. Ill read up on that later. The timing was perfect for both leading and trailing.

Kentetsu

Adjusting the floats is usually a step towards failure. Unless the carb was tampered with before, or dropped, they never need adjustment. Adjusting them usually just leads to more issues, as it can be very difficult to get them right.

P.S. If you had done your research at Sterling's site like I told you to, you would have known that!

Ferrariferg

iTrader: (3)

The floats were not level or anywhere near where they should be so I adjusted them to proper specs and both bowls have the perfect level of fuel.

I'm about to go pull the plugs in a couple minutes. last time i pulled them they were pitch black and soaked in gas. They are brand new plugs so they shouldnt have that much carbon on them already should they? While I have them out Ill test the coils as well.

kutukutu1

iTrader: (5)

my car was doing the same thing as well, when i bought it and after a rebuild too, it took alot of tuning, float adjustment and make sure your float vent is not capped.