Mecho0311

Ok so I e got a 2004 rx8 automatic that I have recently jaust got to start again. But the Gas gas pedal( should be could a air pedal ) isn't responding at all the car will crank and idle for a little bit then eventually cut off. No response from the throttle. I checked all fuses everything seems to be working correctly but the pedal. I thought maybe it was the cat due to what my wife described as loss of power and and slow acceleration so I took the cat out I gutted the cat and stuck it.back on is. No fix there. Same problem. Next I thought maybe it's throttle position sensor. I swapped that out with a known working throttle body and stuck it on. Still no fix. Next I thought maybe it's the fuel pump so of course being me I broke the fuel pump ring and broke the nipple off the fuel pump where the fuel line that sits in the gas tank off. Being a genius that I am I glued it back on. Now it's getting fuel and pressure is great but still no fix but there is s leak at the fuel line that runs from the top of fuel pump to the engine. Still no fix.

And I have a 2005 shinka I think. It doesn't like to stay running or crank back up when it reaches normal operating temperature. Could that be lie compression or maybe coolant sensor or something like that

AirlockRX

What codes are you getting?

Mecho0311

Idk cause i reset the ecm. You know the 20 quick brake presses.

Mecho0311

I haven't hooked the 2005 shinka up to the obd2 yet but will today

Loki

iTrader: (1)

Does the gas pedal not make the engine rev faster at all? It sounds like you're not getting any signal from the pedal to the ECU. Have you checked the pedal and wiring?

Low compression, fuel pump and other physical problems would make the car perform poorly, but not prevent it from atttempting to rev at all.

[edit] didn't realize you were talking about 2 separate cars. For the shinka, it has trouble starting when warm, that point to low compression. Get it tested before investing money in it.

AirlockRX

My feelngs, exactly.

Mecho0311

Yeah that's what I was afraid of, About the shinka that is. Good thing I only paid 400 for it. Anyway I just took the pedal off the shinka aswell as the fuel pump. I swapped the pedals. Now I'm in process with the fuel pump. Unfortunately I have seemed to have broke that little nipple that seats the fuel tanks fuel line again. So that kinda blows that was the whole reason I. Bought the shinka was for parts. Ill let guys know how it turns out when the fuel pump arrives once again thanks for all help. So far it's rx8 3 - mecho 0.

Mecho0311

Ok so now I'm thinking hey, maybe I should swap the computer from the 05 shinka to the 04 rx8... feedback or tips on how to go about this anyone?

Loki

iTrader: (1)

Can't swap a manual computer into an auto. If they're both auto, the computer is in a box beside the battery. Easy to access. I would at least check it visually.

However, you can't just switch computers, you'll need to have the ignition key, immobilizer and perhaps other things to be programmed to play nice together. Only Mazda can do that.

Mecho0311

They are both automatic. But I'm am stumped right now I have no idea what what where to start next. It's not throwing codes because I reset the ecu. I can't drive it cause the pedal don't work i replaced it with known good one still no fix I'm ordering a fuel pump maybe that is the factor if any body has had any ideas or dikokae problems before please tell me how to remedy This this thanks. Thanks for all of the answers previously

Loki

iTrader: (1)

Before you order more parts, do you want make a video of the problem? If the pedal hasn't fixed it, then the fault might be in the wiring between pedal and ECU. This would be strange, but not impossible.

So just to be crystal clear, when you press the gas pedal, absolutely nothing happens? no increase in RPM, no change in sound, nothing? The car continues to idle?

Do you have a OBD reader? If not you can get a bluetooth one on amazon/ebay for cheap. What I'm looking for is data on the throttle pedal position and throttle plate position. If the pedal position always reads at 0, its a wiring problem. If it reads the input but then does nothing with it, that'll need more exploration. If it reads the input and believes that it adjusts the throttle plate accordingly, but nothing happens... this shouldn't be possible.

AirlockRX

+1.
Although I've never had fuel pump issues, I don't see any association with this particular problem. The vast majority of these components are computerized, not mechanical.

Mecho0311

I haven't made that video as of yet I will post it as soon as I get a chance But when I press the gas pedal I can kinda hear a difference but not enough to get a rpm change. However it all started when me and wife were driven and it just cut off. For days it sat there I checked battery terminal charged battery swapped battery, I changed the three relays one was head one was starter and one was ETV, air filter, coils, plugs, wires, eventually I towed it home. Now after I replaced one of the relays I was able to start it once and drive it around the my neighborhood and when I pulled back in the driveway it cut off couldn't get it started until two days later after I realized I did t have the plug wires in the right order. I got them in the correct order Now when I was able to get it started that one time obviously gas pedal was working. Ever since then nothing. It will start but gas pedal nothing

Mecho0311

Ok I want to thank everyone who responded to my crisis. I feel real dumb. I swappped every fuse on my 04 rx8 with all the fuses on the 05 rx8and surely not that was the problem. I feel dumb right now guys. Thanks for your help and taking you time to help.

AirlockRX

Just glad it turned out to be minor as some of us were thinking.

Loki

iTrader: (1)

But... that fuse blew for a reason. Did you figure out which one it was?

Mecho0311

I haven't located it as of yet. I know that when I was driving it sometimes I would smell burning smell but never see any smoke. I figured that's cause Mazda sucks and should have put a better coolant system in rx8. Now o have t located the burning smell location. Does any of y'all know the best place to look first of second. I confirmed that it wasn't the circuit fuse. Then had to stop. But I will get back at it in the morning and get to the bottom of this dilemma and I ordered a fuel pump as well. Thanks guys.

Loki

iTrader: (1)

The cooling system is fine and nothing burns at 200F. But if you're leaking oil or coolant, that will give all kinds of smells. I guess if that fuse fails again you'll know which one it was. Just carry spares.