Have an auto tranny, when coming to a stop and I am in drive, if the ac is on the car vibrates violently and stalls. If the ac is off I have no problems, if I put the car in neutral I have no problems. Its only at a stop, in drive with the ac on, the car stalls. I searched and found maybe a bad clutch cwitch or some plug on the tb? But all those solutions were on manual cars, so I do not know if their was a difference. Any help would be really appreciated.

 

What's the background on the engine? How many miles on it?

 

Your problem is with the auto tranny, they did a TSB on them a few years back saying that it needs to be converted to a manual transmission. Just thought I would let you know.

 

44k miles on the engine, no problems good history, stock parts except downpipe. Im selling the car so im not going to do a swap.

 

usually this is a sign of impending doom, meaning the motor is getting weak, losing compression. do you have a boost gauge so you can read vac?

 

any other issues like decreased power, or starting issues?

 

No slight transmission related problems in the past? Or idling problems? What were your problems before, I'm pretty sure this isn't your first .

Jeremy

 

No previous problems engine related. Boost is fine and getting the right pattern. I get really shitty gas mileage, like 8 to 10 miles to the gallon. I think that might be the fuel filter. Some problems with the lights but nothing with the engine.

 

Before tearing anything apart, get a compression test done. Typically, with auto's, that's the sign of low compression.

 

i'd take it to a reputable shop and have them clean my injectors...........

should be under $100.00 and may just fix the problem

 

You may wanna check the following:
Fuel pressure regulator
Idle control solenoid
The shop manual troubleshoots this condition.....does it also happen while shifting from neutral or park into drive or reverse?
Allen

 

sound advice, this is what I've heard also. plus if you plan on selling the car, one of the first questions you're gonna get from a serious buyer is, "What are the compression test results."

 

you're thinking idle air control valve? I think he said it only happens when the a/c is on.

 

if you want to try raising the idle as a workaround look at this search:

https://www.rx7club.com/search.php?searchid=505426

i still think a compression test is a good idea.

 

There is an SSP on stalling requiring ECU replacement. Since you're selling the car I suppose it's irrelevant.

 

Does the A/C work well when driving? My dryer/evaporator went out on the A/C system and caused my car to stall when stopped and in drive (A/T).

 

this isn't always true, there are other cases like alternator and battery problems. I've had an open wire near the alternator and my voltage meter would move up and down from 12.5 to 13.5. He should get an alternator test and check for open wires.

 

I suspect motor is going out but your mileage is still low. Perhaps it's a reman? Do you stall in other condition? You'll want to do a compression to find out.

8 mpg is indicating something wrong. How old is the O2 sensor, fuel filter, air filter, spark plugs?

 

I had the exact same problem. Whenever I would have the AC on, the car would wanna stall when I'm just idling or just beginning to accelerate. For example, at a stop light and the light would turn green, the car's RPM's would fluctuate up and down from 750 to 0.

I can't really say I fixed the problem, but in a sense I did. I dont have AC or PS anymore, and there is no more problem. My motor and auto tranny have run fine since the fall when everything was removed. No more stalling at all. Also, in late summer, the fuel filter, spark plugs, and O2 sensor were replaced.

So if it's anything like my problem, you can rule out this talk about the motor being bad, and the tranny as well. Check the simple stuff first before assuming the worst.

 

Bringing this back from the dead... still have not fixed the problem. Seems like it is getting worse, not only does is stall in drive when im at a stop with the a/c on it now will also stall in drive when im at a stop. New o2 sensor and spark plugs were replaced. Also a new tps sensor was put in about a month or two ago. Any other ides, my last option would be to check the compression, but I am to fearful of the results because the guy who does rotaries down here is notrious for screwing people over, so he might say I have low compression and need a rebuild to make some money

 

bump!
here's my problem.

So i was driving back home from a rotary workshop . Quite a long drive as it was peak hour too. On my way back home my fuel indicator light went on so i dropped by Shell to fill her up.

I switched off the ignition and my turbo timer went for 30 seconds.
Went inside to pay, had a little argument with the dumb Shell guy who couldnt see the car coz it was too small and was in between two cars. (one was a 4WD)

Anyway, to cut the chase. After i iginte the car i switched the Aircon on then off I go to the exit curb. After it was safe to get to the main road, my engine stalled all of the sudden like its about to die but it didnt. It's as if i didnt put enough clutch in where infact my left foot was flooring the clutch to the max.

I tried to make the car move by depressing the clutch a bit and pressed the gas but the 'stall' feeling happened again, this time with no power even after i press the gas deeper than before. (and oh, i've switched the aircon off too)

Then once i got back home, my engine's idle RPM went up and down, above 1000 rpm...and less than that too.

The car is pretty much stock execpt for the catback system.
Have just done major service
Compression test was 100 and 95.
Running on stock boost,
Dyno tuned (190hp)
Manual transmition too.

Do you think these factors might have caused it?
1. Hot weather messing up cooling?
2. Traffic jam (thus increase engine temp)?
4. not properly cool the engine down (I set the turbo timer to .5 min before i fill the petrol?
5. Turning on the aircon.
6. Filling her up with Optimax?
7. Vacuum hose?
After i finished work (about 10PM, the weather was cooler too). the engine runs fine no complain whatsoever.

Suggestion anyone?

 

When my 94 RX-7 was an auto I had trouble with the car stalling if the a/c was on. I was told various things including a dealer more or less saying that it was a consequence of having an auto RX-7. He said there wasn't much that could be done. Anyway I lived with it. Then some time later I couldn't pass PA emissions. The dealer said they compression tested the engine and I needed to have it replaced. I didn't argue since it was under warranty. However, I mentioned it to Dave from KD Rotary. He told me to make sure they check the cat. He suspected it might be more a problem with the cat than the engine. I called the dealer and told them to check the cat while they had the engine out. They called me back and confirmed the cat was very bad (I think he said pieces fell out when they shook it). Anyway, after a new cat and a new engine I no longer had the problem with stalling. I suspect the bad cat might have been the problem. You might want to check your cat.

 

I had the same thing happen to me, and I had a new motor! with about as good compression as you can get, I am sorry that I do not have a fix, because I am now having a 5spd swap, but as far as the compression goes, for me at least that was not a factor.

 

no no...my FD is manual. I filled up this thread better than adding another uncessary junk to the forum. The cat was fine. Exhaust was checked. And since it coulnd't passed EPA it had this thing added to the cat. I double checked with the rotary workshop and the guy said it should be fine. And oh, I didnt change the DP too as it was Jap-spec.

Perhaps Aircon and FD is not a good combo....

 

which cat are you talking about? MP or CB, I replaced the dp already.