2007-09-03 09:55:59 · 9 answers · asked by reedrarjms 1 in Cars & Transportation ➔ Car Makes ➔ Mazda
Why are you saying the car is running too rich?
Up until 1980, the carb had two adjusting screws. One controlled air volume to the idle circuit, the other controlled richness. The difference was that this model and earlier models had what is called a thermal reactor as part of it's emission system. In order to work correctly, the mix had to be quite rich so that the exhaust would continue to burn in the thermal reactor (exhaust manifold). When adjusted properly, they had virtually "0" emissions.
In 1981, they started putting 3 catalytic converters on the RX7. They made a special tool to adjust the carb. They probably no longer exist. Most 1981 models have had the limiters removed.
On most 1982 and later RX7s, I think the mix adjustment screw was plugged. Usually the plug can be removed, but the carb often had to be removed to do it.
A relatively common problem with the carburated RX7s was the carb float sticking. This caused raw fuel to flow into one half of the carb (#1 housing, or #2 housing). The cars would sometime run, but were very rich and often flooded to the point of stalling and being unable to restart.
The mixture adjusting screw was in the center base of the carb. You could access it by leaning over the drivers side fender and looking at the bottom section of the carb where it attaches to a plastic shield and then onto the intake manifold.
2007-09-04 05:53:06 · answer #1 · answered by the mazda mechanic 4 · 0⤊ 1⤋
1983 Mazda Rx7
2016-10-06 07:17:11 · answer #2 · answered by ? 4 · 0⤊ 0⤋
1983 Rx7
2016-12-08 18:48:16 · answer #3 · answered by schifano 4 · 0⤊ 0⤋
well it is a good ol' wankel rotary. They run rich, owned one of the same generation. Ran very rich. The rotaries of yesteryear were very dirty primarily due to the richness of the A/F ratio and the oil that has to be directly in the combustion chamber. If the rotary runs lean and detonates a little bit your apex seals are done. Rotaries have always run rich, due to the physics and build of the engine. I would say clean your carbs and don't mess with the mixture.
2007-09-06 16:29:34 · answer #4 · answered by Corey the Cosmonaut 6 · 0⤊ 0⤋
well, since the 83 RX-7 came with a carbureted 12a engine, there is no air flow device or O2 sensor. Its all carb'd goodness. That said, most likely all of your problems lie within your carb itself. I'm no carb expert, but there are enrichment screws and all sorts of adjusters on a carb that you can fine tune to get the proper mixture. the folks in the first gen section over at www.rx7club.com can help you out with all your carb related issues far better than I can.
2007-09-04 03:03:14 · answer #5 · answered by Anonymous · 1⤊ 0⤋
Whatever system your car uses for a Mass Air Sensor may be dirty or clogged, effecting readings of air volume coming into the motor.
Find out about the system and clean your MAS.
2007-09-04 00:26:16 · answer #6 · answered by cnshinn 6 · 0⤊ 2⤋
your car is carb right? if so, the carb has something like a valve for spray gas that thing must be bad so rebuild your carb, that will help
if your ride is fuel injection then you has a bad flow-meter
2007-09-04 06:45:35 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Clean/replace the air filter.
2007-09-03 13:57:07 · answer #8 · answered by teamepler@verizon.net 5 · 0⤊ 0⤋
possible o2 sensor problem
2007-09-04 01:49:10 · answer #9 · answered by richardmckee7 3 · 0⤊ 1⤋