I have always dream of having this car, 85 RX7 GLS, I just bought from an auctions the exterior and interior are in great shape, the engine starts and can rev up to 7,000 RPM, but when I put it in gear and start driving the engine loose power and can hardly accelarates, I have been able to get it up to 40 Miles per Hour in third gear. but it takes forever.

Some times I notice the car to come back to life, ( revs faster and stronger) , but it goes back to normal. in 10 seconds.

I can hear the a strong pshh when I remove the spark plugs, on both sides, I just don't know how much I have to turn it to hear three on each side.

I have read aboout DeCarbonizing the car (I have been doing that) I check the spark plugs they look a little burn black but they are not wet from gas-oil. I spray the carb with a STP carb Cleaner, the car sound great after I spray-clean it. but only for a 10 seconds and then goes back to normal.

People talk a bout the exhaust been clog? how can I check this one? I am not a mechanic but I think it has to be something with the air-fuel mix?


Mario

 

what do you mean, are you turning it by hand? use the starter for chrissake, don't be shy. You'll hear an even rapid sucesion of pshhes, or you are in trouble.

 

Run a can of Seafoam through the fuel tank, 1/8-1/4 tank full. Do a full tune up. plugs, cap rotor, timing, plug wires if they look oem. If the accelleration is really lame, it is usually clogged cats or fuel supply. To test the cats, have someone rev it up and hold your hand at the tailpipe. If it doesn't push much against your hand, drop the cats and inspect for plugging.

How many miles on the car and how long did it set?

 

That's possible. Exhaust clogged means mostly your catalytic converters are clogged.

If they are the original ones, they are most probably clogged so that's a no-brainer.

Also, think that this being a 21 year old car, you should do a full tune-up if it hasn't been done recently. That means replace spark plugs, their cables, dizzy cap and rotor, all filters (air, fuel, oil), do an oil change, check and correct timing. And maybe get your carb rebuilt by somebody who knows how to do it.

Edit: haha trochoid you beat me to it.

 

1. Make sure the distributor cap is on straight and in good condition (easy to put on crooked though).
2. Make sure that you have spark on the leading (lower) spark plugs.
3. Check all wiring on dizzy and coils for loose connections, check the plugs on the ignitors too.
4. Make sure that the throttle linkage is positioned correctly, and that the "teeter totter" is not flipped over.
5. Change the fuel filter. Actually this should be number 1 but I'm too lazy to change it
6. One can of Seafoam to 1/8 tank of gas (after all of the above has been checked and corrected) and then take it out for a hard run. This will free up any sticking apex seals.

 

Wow, great and fast input...I will do a full tune up and install a monsa exhaust system, and the seafoam stuff.

BTW, I was driving today, when I started it sound and the power was good, first gear and the car respond, second gear and the car responded. I brake for a stop sign, then the car when back to the sluggish accelaration. but I turn the car off while moving and put in first or second gear( I try this more than a couple of times) then the power was back, I shift to 2nd or 3th, and the car respond very well https://www.rx7club.com/newreply.php...e=1&p=5973453#
Smilie That was great, but as soon as I need it to brake, slow down or break the momentum it when back to "slow mode".

BTW he car has 151000 miles on it, I bought because I want to autocross it, now my 3 years old daugther loves the car, and she told me she wants to keep it for her.

I just sold my supercharged Miata, and I own CRV and civic, but I love the feeling of a RWD, plus I like the 8000 RPM tach, I just hope I will be able to kill some corvettes, mustang and camaros in the autocross.

 

I put $50 down and says if you bang the carb around a few times whenever you dont get power...you'll get it back. If i were you I would lose the carb and get the Holley setup, Dellorto setup OR send your carb out to a man on the forum known as Sterling....you're problems will stop there. The other stuff you should do for good measure. That exhaust will free up some ponies too.

Thats awesome you got ur daughter into it! We need more women into our cars! A word of advice though if you're going to autocross .........BOTH FEET IN

 

Yeah, the 1st gen forum is one of the best around. And we're lucky to have guys like trochoid, Kentetsu, rx7doctor and others who have a lot of experience and have no problem sharing it. Along that line, never forget to search first, as there is a wealth of information already covered in past threads. Plus the FAQ section.

 

Have you read through the FAQs yet?

 

Yes I read as much as I could, but if you have some thread, I would like to know to which can help me find more info.

M

 

cdrad51, thank you for the compliment.

Looks like everyone has covered everything.

I would have to lean toward fuel supply being that you are revving to a certain point then loss of power under a load. As others have stated, replace the fuel filter, it is very common on the carb'd models to cause a major problem. I recommend after the fuel filter replacement to do a fuel volume/pressure test. If the filter has been clogged for a while it will make the fuel pump strain and then when it starts to fail it will cavitate, or in other words start pushing air instead of fuel. Then it could be the float level is off because the needele seat is sticking.

Anyways follow the advice of my esteemed rotarians and all wil be well.