Fromslowtogo

ok im a little new too carbs im a fuel injected guy lol but when my 12a is idleing it has a funny miss kinda thing happening and at idle it only has gas going into the front right barrel is thisa normal? if not whyats up with it? any help is good help

rxtasy3

iTrader: (2)

sounds like the idle circuit is stopped up.

Fromslowtogo

elaborate what is it lol

RUBY7

You know my RX7 had that little miss on idle for 3 years, thought it was the carb (as it is a four letter word) The the igniter box on the altenator died, new altenator no more miss.

Cheers Sue

r0taryr0ck3t

mine does the same thing but it also bags out around 4500 rpm in 3rd,4th and 5th gear... im going to take it into a rotary shop inmy city, i believe it is the carb or a vacuum problem

Fromslowtogo

yeah where i am the nearest rotary shop is like 3 hours away grr

RUBY7

Yep, Yep mine was doing the same around 2500rpm, all the way through the rev range, get them to check your ignition.

My mechanic told me it would not be ignition but it was.

Fromslowtogo

what part of the ignition ?

IanS

iTrader: (4)

I had the hesitation and looked at my dizzy rotor, and found that it was cracked. Because of this, I replaced cap, rotor, plugs. Plugs werent that good when not firing correctly. I would start there. It doesnt cost too much and even if it doesnt fix it you know that it ISNT the problem. Maybe even be a faulty coil. Not sure how to test them though. I do know that they are roughly 30-35 a piece for stock replacements from autozone.

IanS

slashdawg00110

Replaced your fuel filter lately? What you've described can be the result of a dirty filter.

slashdawg00110

You should be seeing fuel coming out the mozzles equally in both primaries. The primaries are the venturis on the right-hand side as you face the car. Have you looked at the float bowl levels? The fuel level should be about 1/2 way up the glass in both bowls. As someone else said, you may have some clogged passages. Sounds like it's time for a carb rebuild. Not too hard to do as long as you have patience and clean place to do the rebuild. Look in the FAQ for some tips on doing the rebuild. Or you can email Rx7Carl or Sterling and make arrangements to have a rebuild done for you.

Todd Staples

I agree with slashdawg00110. If you aren't getting fuel to both barrels, you probably have a carb problem. You would be pleased with a rebuild. Will probably help the gas mileage along with better performence. Go ahead and change out the filter while you are at it.
TCS

Fromslowtogo

i got another carb sitting here ill throw it on and see what it does if not ill rebuild one of them and the filter was changed 2 days ago along with cleanign the lines all otu

RUBY7

Ignitor box, earlier models are easier as the ignitor box is mounted on the side wall of the engine bay near the battery.

This problem persisted through 3 motors and two carbs. The car now has a freshly built motor and revs cleanly throughout the entire rev range

Hope you find your problem, Sue

Fromslowtogo

any body have a pic of what the ignitor box looks like or how to test it?

RUBY7

The ignitor box on your car is a small black matchbox shaped thingo on the side of the altenator.
Not sure how to test it, we stumbled on it when we inadvertently swapped the coil lead back to front, (the car reved perfectly like this but would not idle, so it was clear that the leading spark was at fault) we tested the spark and found that once the motor was revving around 2500 the spark was not strong enough to bridge the gap.

Fromslowtogo

thanx ill check this out