brianxfrost

I recently bought a 1993 rx7 and the car has a few issues! Was hoping by describing them someone could help me pinpoint what to look into. First off the car has a fresh rebuild Polished ports, new apex seals, Gt35R single turbo, ETS front mount, Tial wastgate, Hks carbon exhaust, KGP fuel rail, Denso fuel pump, ID 2000' secondary injectors, Apex power commander and FC, Innovative LC1 wideband and a Greddy Profec B. The problems ive been having are that it doesn't like cold start and idling. You have to keep the rpms up and let it warm up that way and it seems to be fine. Then when you're driving it around and come to a stop it wants to die and ive had it flood a few times trying to get it running again. The air fuel seems to be all over the place as well. I do know the car has a pretty big exhaust leak which the previous owner said is causing it to run rich and die. I went through the deflooding process and notice the plugs were pretty bad and that the rubber boot inside the spark plug socket was stuck on one of the plugs and is wasn't even really hooked up. I cleaned the plugs up and hooked the wires up correctly and it ran better but still having the same problems. The car was tuned in TN and i live in WI, it was warmer down there and its been 32 degrees here, i've heard that it could be a climate thing? The previous owner also premixed and i feel like it was to much oil and filled up more 93 octane to even out the mixture and that also seemed to help some! I'm hoping someone can help me out and point me in the right direction, i'll see if i can maybe get a video of how its running. thanks

diabolical1

iTrader: (3)

welcome to the board.

has the car had anything other than a startup tune?

brianxfrost

I don't know what you mean by startup tune? It was rebuilt and tuned by addicted motorsports unlimited.

diabolical1

iTrader: (3)

startup tune ... what you use to basically get the car from point A to your tuner's shop. the car doesn't need to run right for it, it just needs to run. i'm asking if you know exactly what has been done with the car? was it running great before you bought it?

you ripped off a list of seeming decent parts, then indicated that the car was "tuned" in Tennessee. however, somewhere in there the previous owner blamed a BIG exhaust leak for it running rich and stalling out, there was also mention of fouled plugs and loose wires, and fluctuating AFRs. i don't know crap about Addicted Motorsports, but i would imagine if they "tuned" the car (as you stated), then it left them running at least decently - not drowning in fuel and unable to go through a warmup cycle. if they simply got the car started for the previous owner and he/she was supposed to return for actual tuning, then that's a different story, but it is relevant.

i don't claim to be capable of telling you what's wrong, tuned FDs are not my thing, but the more information (facts, details, a timeline, etc.) you can provide, the better someone that knows tuned FDs will be able to help.

kreepinmongoose

sounds like it might be a vacuum issue and or bad O2 sensors .

brianxfrost

So after a few days of trying to figure this out on my own i gave in and called my local mechanic and brought the car over there to get looked at. He said the exhaust leak was caused by a missing bold on the manifold. And the rough idle and strong gas is being caused by not having an O2 sensor! Im lost, I don't know but i thought you had to have an O2 sensor? How could a tuning shop let this go? Is there something i'm over looking? Makes me kind of worried about the tune on the car or if there even is one? The power Fc was the only way he found out about the O2 sensor, he tried plugging his scan tool in and couldn't get it to read anything? I'm just telling you what i know, i dont have the car back yet as he is still working on it. Will keep you guys posted when i hear something.

RxHevn93

I could be wrong, but the O2 sensor is on the down pipe and not hard to miss. Guess it was plugged or something. I had a wide-band O2 sensor installed. Much more accurate A/F ratios and better for tuning.

Dreams_of_Rotary

Someone correct me if I am wrong but I believe the power fc may let you by pass the o2 sensor and is why you weren't getting a check engine code. Also, perhaps the tuner used a wide-band as mentioned above and forgot to put the original o2 back in place. Start by calling the tuner, get an o2 sensor and fix the exhaust leak. If you still have the problem come back here and update the new changes.