Va Rx-7

iTrader: (4)

Last night I was driving my Fd and the second turbo wouldn't kick in. When was was on the highway I would push it little bit and the RPM would be at 5,000 and I would hit the gas and it wouldn't go it felt like the gas pedal was pushing my foot off and the check engine light flashed and went away. I dont know if it is a fuel cut.. But I did smell under the hood. The second turbo will not spool at all and I get full boost out of the primary


HELP

dgeesaman

iTrader: (7)

Pull the ECU codes.

Dave

1QWIK7

iTrader: (33)

Umm pull ecu code?

That will lead you in the right direction.

Va Rx-7

iTrader: (4)

HOW do i pull the code?? I know u have to stick a wire in the dia. box and turn the but in which hole do I stick it in?

gbomb91

iTrader: (1)

not usre exactly but it's easy to find here. also do a search on how to read what code it is. There will be a series of flashes, long and short and you then can determine what the problem is. again do a search it's not hard to find. good luck

1QWIK7

iTrader: (33)

Dude, the sticky FAQ threads at the top of this section will help you in anything you need with diagnosing/fixing/learning about the FD.

But ill help you out this time.

Take a paper clip and jump TEN and GND. Then go inside your car, and count the flashes.

LONG flashes = 10
SHORT flashes = 1

Be careful not to mix up each individual code with the repetition of the codes themselves. A code can be like a 40 or something so watch carefully.

7_rocket

iTrader: (6)

What he said

bryant

i thought he was stranded on the side of the road or something with that thread title.

Va Rx-7

iTrader: (4)

SO After I jump them Than i turn the key in the ON position than i count how many fast flashes and slow flashes and i total them up and that will be the code?? and when do i stop counting...when the light stops flashing?

sevensix

iTrader: (1)

calm down your head might explode

1QWIK7

iTrader: (33)

Its tricky.

You might have to cycle the entire thing a couple times to get all the codes down (if you have multiple) because its hard to determine the repetition and each code itself.

And yes you have to put the key to ON.

Just count all the flashes and jot them down, thats the easy step.

When you see a repetition going, you know its starting over again.

Va Rx-7

iTrader: (4)

I think its code 13 But I will attach the video of it just to make sure Let me know what should be my next step

ObliqueFD

iTrader: (32)

Yep. Code 13 - Pressure Sensor. It is the little black box on the firewall, located to the left of the brake booster. Check to make sure the hose didn't pop off on the underside and make sure the other end of the hose is connected at the manifold. It's possible the sensor has gone bad. To check the sensor, look at pages F-33 and F-181 in the '93 workshop manual.

1QWIK7

iTrader: (33)

Yup, def a code 13. You did the right thing in cycling the code over and over. Cause you have to sure before you start furthering your diagnosing and/or replacing parts.

I never knew the pressure sensor can actually go "bad". Normally the hose just pops off and you put it back with a ziptie. But i think IIRC, 2nd gen people ground their pressure sensors? Im not sure about this but i remember reading something about that back in the day.

OR you can just replace it with another used one, just search the FS section. Its pretty cheap. If its used.

Gadd

The MAP sensor can fail but it's unlikely, it's more likely a problem with the the connector or the wiring. First thing I would do is remove the connector at the MAP sensor and clean it with something like corrosionX or WD40 and reconnect. Then reset the ECU.

Paul




.

RXtacy

iTrader: (7)

Oh man im guessing based on the title and the apparent issue you havent had the FD very long lol.

RXtacy

iTrader: (7)

To be somewhat helpful here is a link to a working map sensor for sale. https://www.rx7club.com/showthread.php?t=702461

Va Rx-7

iTrader: (4)

SO Last night I drove the FD and the check engine light flashed on again and went away...I know I cleared it and checked all the hose that is connected to the sensor and the IM and the hose was still connected.............Replace it????AND i did smell fuel under the hood....Could that be a cause?

bryant

have you checked it like this^^ gentleman suggested?

1QWIK7

iTrader: (33)

^^I agree. If your code was the map sensor, just change it. Its cheap insurance. The link above shows one for sale at 20.00 shipped.

Just buy it and hope that is really your problem. I think you have enough evidence showing that it is.

Va Rx-7

iTrader: (4)

The same code came back after i replaced the sensor....after i replaced the sensor I did disconnect the battery and pushed the brake pedal. What else could be causing this same code???

ObliqueFD

iTrader: (32)

It could be the ECU. I had a code for the fuel pump relay once and it ended up being the ECU, not the relay. If you can get your hands on a shop manual, you can check the continuity of the wires running to the ECU from the MAP sensor. If they are good, then see if you can locate another ECU to swap in.

Va Rx-7

iTrader: (4)

I got a PFC that im getting to install so i shouldn't worry about it??

dgeesaman

iTrader: (7)

Wiring harness. Have you checked the resistance of the branches of circuit through the harness?

The wiring in this car can see extreme heat, and when you start working on it you can create shorts and disconnects that will drive you stark raving mad later on. While replacing harnesses is costly and tedious, it is a huge step up in reliability.