gutz24x

I have a 2007 rx8 with 45,000 miles on it, when I 1st start driving it runs fine. After about 20 mins when ever I start revving it higher it acts like it is running out of gas. (The rpms drop with my pedal too the floor) I can usually pop in into another gear too keep the engine running but today it completely shut down. I wait a couple mins and then turn in back on, start drving and eventually it does it again. I took it too mazda and had them do a scan on it and it came back with nothing just a few miss fires he says. The situation happens a lot faster if I use the air conditioner. Any clues as too what might have caused this? Ive searched the forums for someone with the same problem but nothing like this exactly.


Thanks in advance

Zack

Jedi54

iTrader: (7)

sounds like your fuel pump could be going.
It's a tough one to diagnose because it usually does not throw a CEL code so when the dealership scans for codes, nothing comes up.

gutz24x

Wow already? Is that something covered under warranty?

gutz24x

And thanks for the info

Jedi54

iTrader: (7)

if it's a fuel pump, it should be covered under warranty. The problem is getting the car to replicate the issue when it's at the dealership.

Maybe it's a clogged catalytic converter?
any check engine light at all? (do any lights blink on your dash?)

gutz24x

Im pretty sure i can replicate it, if im driving lol maybe one of the techs can ride with me. No not any lights, the coolant light flash for a quick second then went away but I was low on coolant so I put more in. Other than that nothing else, I mean usually I can revv it all the up when im first start driving it but after a little bit it starts giving me problems.

Jedi54

iTrader: (7)

don't rev the engine too much when it's cold, not good for the car.

gutz24x

Oh well of course I let it warm up before I drive it lol. Im gonna go too Mazda tomorrow and get them too look at it again. Im gonna drive it too, none of this ***** crap. Ill post here what the out come is. Thanks again.

Mazurfer

Where in Florida?
Could be CAT
Could be fuel pump

Jorge, did you notice that they did get misfire codes when they scanned it?
I hate to say it and may get some grief from certain people around here, but it could be coils....he's got 45k miles.

When was the last time the plugs were changed?
How's about the coils?
Are you the first owner?

Jedi54

iTrader: (7)

I completely missed the part about the misfire codes.
I too think you should look into the coils. Start there since it's a fairly easy inspection and not too expensive to replace.

FoxRacer600RR

i had the same thing happend and it ended up being a screen in my cold air intake that had turn sideways up against my maf sensor.......i would describe it as going WOT then turning the key off while still WOT.....do u have a stock intake system if so try and cleaning out ur sensor. where in fl are you located ?


edit i also thought it was my coils before i found out what it was, but i replaced them and it kept doing it

FoxRacer600RR

https://www.rx8club.com/series-i-trouble-shooting-95/car-jerks-really-hard-sometimes-just-looses-all-power-194104/

Mazurfer

Yeah, could be....but then again....he didn't try to use his as a submarine!

FoxRacer600RR

ping....pong.....ping....pong...ping....pong look its a a whale, no its a submarine .....nope its just john thinkin his car can swim.......my defense is " i thought the CAI was a snorkel" :D

but on a more humerus, i have to picture what i looked like sitting in a 2 foot piddle of water looking down out of my window at the water wondering how the hell am i going to get out of here, the wont start and if i open my door water is going to rush in. so i just sit and wave as traffic just drives by lmao.......oh well might as well make fun of myself before someone else does :D

FoxRacer600RR

btw thanks fellow Floridian who didnt warn me that we can have 2 feet of watter in a matter of 15 mins of rain lol, back in WV it didnt flood, even after 3 feet of snow meted, im new to daytona area as of 3 months ago, oh well bet i wont do it again

Mazurfer

Wait for Summer, you ain't seen **** yet!


BTW....to the OP, we are off on a tangent.
Please don't think your issue is even remotely related!

FoxRacer600RR

back on subject, the screens in the aem cai budged out of place before i sucked water in the intake but i do suggest cleaning ur maf along with the other suggestions

gutz24x

Holy **** thats a lot of posts hold on let me catch up lol

gutz24x

I live in Orlando Florida, its hott! I have never replaced my coils. They mazda guy told me my spark plugs were fine but I have two extra ones I can go ahead and replace. (Never replaced them) I am the 1st owner. The reason im thinking its the fuel pump, is because I did run out of gas once.

Mazurfer

This is an 07..........so are you still in warranty since you are the original owner?


Well, it could be the fuel pump, but I just don't think so. You had misfires and our OEM coils are somewhat known as a weak spot. They don't seem to last much over 35k, but there are some of course that do. A lot of us do not run OEM coils.
You've got 45k on the plugs and coils. To me.........that's a long time in this car.
So, if you are going to start with the plugs, you do know that the leading and trailing plugs are different right?
DO NOT put them in the wrong place.

If you want to test the coils and know how to use a meter, see the attached.


I mean seriously, this could be a lot of things, so it best to start with the cheaper, easier things. Since the mechanic said the plugs were okay. I'd move on to the coils as the next thing. Even in a worse case scenerio where you end up needing a new engine, they will put new plugs and coils in before doing the compression check.

Mazurfer

True, but as you know...gotta start simple and it's awful hard to debug at a distance..... which you are also well aware of.
Getting all the info is yet another hurdle, but was hoping maybe a coil would show up to be real bad....ya know?



Actually, in this case, I'm thinking it might still be under warranty, so why not take it in?

I would send him your way of course for the BHR ignition, but gotta see what can be found out first.

gutz24x

Alright cool, so ill check the coils 1st. Even weirder thing is, I disconnected the battery for about 20 mins. I drove it around after that and I could rev it high with no problems. Then I drove too burger king and sat in the parking lot eating with the ac on. It started doing it again right after that just not as bad. The car did sit for about 5 months straight because I had some issues with my license at the time (with little gas in it) I did start it up about every couple days or so. (eventually the battery died and I had too jump start it which is the reason why I disconnected the battery, might of been a computer issue I dont know) One more thing my bumper too bumper warranty was 36000 I think and my Power train is 65000. Will that still be under warranty? I might be mistaken though ill have too look.