Help!
 

Hey guys recently bought an 2005. Mazda rx8,but have run into a problem it doesn’t want to start, I have replaced EVERYTHING fuel and spark related, but when cranking over (and when I can get it to start) gas drips out of my exhaust. Has good compression, cylinder 2 run super rich.

I’m not as knowledgeable as most on here but have you tried resetting the fuel trims?

Also, what fuel are you running?

Sounds like the injectors are miswired. Common mistake when replacing the engine.
Did it work fine at some point, and then broke, or you bought it like this?

Is this phenomenon of excess fuel? gasoline burning does not go away very fuel consumption.

Injectors
 

the car ran ok when I got it it had a cylinder 2 mis fire so I tried to put sea foam in the gas and red line it a few times to get it Thur I did that than car started to smoke bad and started going Thur gas quick like 1/4 tank in about 5 mins so I put all new coils and plug and all new injectors fuel pump fuel damper and now the car will start every once in a blue moon and when it dose it hose Thur gas very quick can’t drive it any where

the car puts out so much feel it’s not starting unless I pull the fuel pump fuse but last night I wasn’t Thur all the wires on car found the the 1st i’m injector pigtail wires were bearing crossed so I buy new pigtail put it on and no difference so I checked my spark and only my leads are sparking not my trailing???????HELP

Can o2sensors if gone bad make your car not start??

Only the leads should be sparking, that's fine.
How long did you drive with a misfire?

There are a few options here:
- injectors miswired. I can't understand what you mean about the pigtail. You said you had them replaced, which is when they would have become miswired. It's really easy to mix up the primaries and secondaries. That would cause your current no start problem, separate from the original misfire problem.
--- check your injector positions and wiring against the proper wiring. You can google for that.

- loss of compression due to driving with a misfire for a while and destroying the cat and the engine
--- get a compression test

- some kind of massive air leak. See if it does better if you unplug the MAF.

In any case, get the spark plugs out and clean the gas off them before trying to start again after you perform any fix.




Can you write in real English though? It's really hard to understand and help.

I drove it like that for a few days but Compression check was done already and all wiring was checked last night the car was running good when I got it until I did the red line with sea foam in the gas didn’t have any fuel issues till I did that?

Why do the trailing spark plug not fire?

And my car is empty on my exhaust it was hollowed out

Trailing ignition is not required in startup.
I think the original misfire issue is separate from this no start issue, and in attempting to fix the misfire (coils, injectors, fuel pump, etc), the new issue was introduced. That's the only thing that makes sense to my mind.
Can you retrace your steps of what all was touched during the work?

Are there any OBD codes set?

Everything I mentioned were the only things that were touched and what I had to take apart to get to them I did for goer because a lot of things I looked up said maf sensor going bad I changed that to but when I pull the plugs out the are soaked in gas to and black Sut on them? And the plugs are new

Right, so it's flooding out, which means too much fuel. Since we're talking about startup there aren't too many ways for that to happen (given that the spark plugs are firing):

- it's firing the wrong injectors (either r1 for r2 and vice versa, or secondary instead of primary), which means they're wired incorrectly OR the incorrect injector is in the primary position. They are not all the same.

Since you say only R2 is running rich like this, that further confirms it one of the R2 injectors. What is R1 doing?

- there is way, wayyy too much fuel pressure, but this is highly unlikely or even possible.



I know you checked the injectors, but all the signs still point there.

Are the coils wired to the correct spark plugs?

I believe so leads are on bottom and trailing on top first coil lead second trail third lead fourth trail and according to the diagram I found injectors are correct and I put them back the way they were when I took them out.cyclinder 2 is near fire wall correct?

And the car is doing the same thing it was doing when the problem started before I took any injectors out at all all I did before this happened was put sea foam in my gas and red line the rpms than car started acting up

Could the Bare wires that were crossed together on the primary first injector cause this problem to stay happening after being fixed?

The only codes I had before this happened was cylinder 2 misfire and heat o2sensore

Verify injector wiring is correct:

http://travelersunlimited.club/wp-co...gram-radio.jpg

Yes that is the same diagram I found

You put seafoam in your gas???? You're not supposed to put seafoam in your gas...

Yes I put sea foam in my gas why are you not supposed to I mixed oil with it when I did it so it would mess with drying anything out

Seafoam is supposed to be put into the engine thru the vacuum hose, never in your gasoline. Was this seafoam meant for gas use or is it the normal one?

The sea foam Is used for gas

https://cimg1.ibsrv.net/gimg/www.rx8...588cb23d0.jpeg

Still worth re-checking. I've been working on these for years and still managed to goof the connections of two injectors on my last build. Also note that the wire colors and wire tape colors can be hard to determine on some RX8's due to heat-cycling and age. There are also three slight variations of the wire colors, though the one I posted is the most common for the Series 1 cars.

Seafoam is fine in the gas, though I wouldn't make a habit of it. I also don't have any data to support the benefit of it either.

For reference, the last set of RX8 injectors I had professionally cleaned came out of a 90k mile car that sat for one year with old gas in the lines. Test results from before and after cleaning showed a 0.5-3% improvement in fuel flow, however the variation was as high as 5% between the injectors; with post-cleaning closing the gap to 1%. While it is good to have as little variation as possible given that most consumer cars do not do per-injector fueling balancing, the fuel flow being less than stock rating by 3% means nothing for a stock car. The factory ECM can adjust fueling by up to 20% to account for injector variance in age, manufacturing and the usual variables like ECT, IAT ,and altitude.

All that is to say that knowing the health of your injectors is a good thing, and should be a given for a car that will be modified, but that the cleaners in a can may be wasted money when you consider that even in poor conditions, the injectors are pretty resilient as long as the fuel filter was kinda maintained and always present.

My injectors are all brand new now and they are doing the same thing as the oem ones that were on the car I changed them bec of the problem and nothing has changed

so just got the car to finally start and the only way it stays running is if you keep your foot on the gas and only code coming on is o2 sensor bank one sensor 2????????

What's the code? That's the post-cat sensor. It has a number of different codes.
Some make sense if you're running rich. Others indicate a problem.

p0036

Is your post cat O2 sensor unplugged? Because that's basically what it says.

no all sensors are plugged in

Well then the post at O2 is damaged or the wire to it is damaged. That's what the code means.

You can, but it should never be used as a troubleshooting procedure. There is no "fix in a can."

Not sure if this relates to this particular problem, but did you mean mixing oil with gas? If so, what kind of oil? 2-stroke or 4-stroke? Don't put 4-stroke in your gas tank, ever.

It was two stroke

Help
 

What all controls fuel pressure on a rx8

The fuel pump has a pressure reg, but another thread made me realize that the pump has 2 speeds. On startup and at idle it runs in low speed mode to keep noise down. Above a certain speed it runs at full speed. This is controlled by ECU, I believe via a switched resistor pack.

What all did you do to get it to start? Like what was different about this attempt than all the others?

To get it to start now I have to have someone in the car turning it over while I have the fuel pump fuse out than when it starts I put it in and it just blows big white clods of gas out the exhaust than as soon as you take your foot off the gas it dies

so I just put new injectors in it and now it won’t start at all

Still leaning toward injectors plugged in wrong. Or maybe one it a dud and it's stuck open.

Help
 

so I have another 05 rx8 and I just replaced my injectors and now my car won’t start dose anyone have a pic of where the wires go or a diagram for the injectors

https://cimg0.ibsrv.net/gimg/www.rx8...4ebeda4994.jpg

This is what I used with my new engine.

Help
 

[QUOTE=_JB_;4962874]https://cimg0.ibsrv.net/gimg/www.rx8...4ebeda4994.jpg
I only have two blue injectors and two red ones that sit under my blue ones

[QUOTE=Dan Morey;4962875]Sorry, I thought you had a 6-port. I believe wiring is the same for 4-port engines, except you don't use Rear Primary 2 or Front Primary 2.


https://cimg2.ibsrv.net/gimg/www.rx8...edd19c7bed.gif

Help
 

So I got them figured out got it to start and run and it ran for about 10 min than just shut down and just cranks over now won’t start again any ideas

Does it start if you let the engine cooldown or sit overnight?

Help
 

yes it will start the next day

Rpm’s are also only around 800 when it warms up

Have you gotten it compression tested? Even with a generic tester it can tell you if your dramatically low.
Also what are the fuel trims saying while it's idling.

Generally, if the car drives fine at higher revs when it warms up, then it likely is the compression. Nothing you can do other than a rebuild.

If the car struggles at higher RPM, there is something else going on, like a dying fuel pump or ignition issues.

800 RPM doesn't sound low for warm idle.