Backfiring/Cutting out VIDEO

[trackjunkie21]

the stalling out may be due to MORE vacuum leaks on a different engine.

BUT, when car is running sans HFM or sans O2 sensor - it is in STUPID mode. Runs rich on purpose.

install a wideband AFR O2 meter and test it on your own car and test it if you do not believe me.

I actually have a wideband AFR O2 meter installed in my e30 - I care about how it is actually running.

I know it will run rich, I'm just saying the stalling when jabbing the throttle is highly unlikely from the 02 sensor. More likely to be the MAF.

[lolcantturn]

tried a known working MAF, no difference. Still not running an O2 though.

[Blackangusinc]

The fuel pressure regulator is able to maintain proper fuel pressure to the vehicle it has been designed for because inside the regulator housing there is a spring pushing against a diaphragm, the spring pressure has been pre-set by the manufacturer for the desired fuel pressure, so the fuel pump has to pump enough fuel and enough pressure at the same time to overcome the spring pressure.
The extra fuel not needed is sent back to the fuel tank through the fuel return line.
When the vehicle is at idle, there is less pressure against the fuel coming inside the regulator because the fuel pressure regulator has a vacuum hose attached to it, this way the fuel pressure will be lower ( from 5 to 10 psi depending on the system) due to the fact that the vacuum is forcing the diaphragm inside the regulator housing to have extra pressure against the spring, resulting in a lower fuel pressure when the car is at idle because there is high vacuum inside the intake manifold; when you accelerate and the vacuum drops, the fuel pressure increases to allow the engine to have more fuel as it needs it.

JrCamacho, you ripped this off word for word.

http://www.howstuffinmycarworks.com/Fuel_pressure_regulator.html

Also, while some of this may be true of a rising rate FPR, it is not true of a stock FPR. Stock units vary fuel pressure only to compensate for changes in manifold pressure. Injector pulse width is the determining factor for the amount of fuel the engine sees. The FPR simply assures that the same amount of fuel is delivered for a given pulse width Independant of manifold pressure.

[lolcantturn]

video update bump!!!! look at my first post

[lolcantturn]

bamp

[gp.plus]

I've got a spare fpr if u want to try that.

[lolcantturn]

I've got a spare fpr if u want to try that.

haha you're the boss. I moved out of drexel for winter break, i'll PM you.

[lolcantturn]

On the highway when I was driving to my girl's college, my engine was cutting off at 70mph @ 3000 RPM unless I went a little quicker, I had to keep the RPM's high and rev match into every gear so I wouldn't experience cutting out due to the RPM's being lower than like 3500RPMs, it sucked. Then sometimes it cut out completely and even in gear, the engine wouldn't start back up! Then sometimes I could put my foot all the way to the floor when it died and it would start back up forcefully.
I think it could be an FPR problem because as you can probably hear in the video, it sounds like intake backfiring = lean condition?