furansu

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.

Dan Morey

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

Dan Morey

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????????

Loki

iTrader: (1)

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.

Dan Morey

p0036

Loki

iTrader: (1)

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

Dan Morey

no all sensors are plugged in

Loki

iTrader: (1)

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

UnknownJinX

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.

Dan Morey

It was two stroke

Dan Morey

What all controls fuel pressure on a rx8

Loki

iTrader: (1)

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?

Dan Morey

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

Dan Morey

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

Red line envy

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

Dan Morey

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

_JB_

This is what I used with my new engine.

Dan Morey

[QUOTE=_JB_;4962874]
I only have two blue injectors and two red ones that sit under my blue ones

_JB_

[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.

Dan Morey

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

_JB_

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

Dan Morey

yes it will start the next day

Dan Morey

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

Red line envy

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.

UnknownJinX

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.