Yet more issues. Multiple DTC's.

[Miracle]

That guy won't give up on the vacuum leak theory lol

I know right... I guess having both a vacuum hand pump, AND a vac/boost gauge that holds steady doesn't mean anything now days...

Oh well...

 

[Mr.CuBaN]

any luck yet???

 

[Miracle]

any luck yet???

Going to address the P0171 (System lean, Bank 1) code tomorrow by replacing that banks O2 sensor, relearn the ECM, and hope all is finished with this issue...

 

[SilentScope]

jeez looks like you've had your hands full.
well hopefully after changing the sensors and fuel filter it'll come right!
let us know what happens...
i wonder if all of this is a result of using the octane booster?
i hear that stuff can do some damage on boosted engine!

 

[Miracle]

jeez looks like you've had your hands full.
well hopefully after changing the sensors and fuel filter it'll come right!
let us know what happens...
i wonder if all of this is a result of using the octane booster?
i hear that stuff can do some damage on boosted engine!

I am assuming that is what caused all this.

Never again will I run that crap. Car ran FINE (aside from the slight misfire) before that, and had never used octane booster before.

Never again.

 

[Freaknazty]

I told ya it was the damn 02 lmao go change the damn thing , kick yourself in the shin for adding booster and go beat on it good idea on the fuel filter too shit probably built up in there from the additives ...... and brake clean ? really come on man may as well just use acetone . If anything listen to nav on the carb cleaner it works ( for that vac leak you deff. have )

 

[tapsport]

possibly a weak coil on a couple plugs?? only does it under boost, just a thought

 

[Sinotis]

I know right... I guess having both a vacuum hand pump, AND a vac/boost gauge that holds steady doesn't mean anything now days...

Oh well...

So what ended up causing the really bad sounding exhaust leak and hissing sound?

 

[marcspaz]

So what ended up causing the really bad sounding exhaust leak and hissing sound?

His engine was dumping too much fuel in all of the cylinders and not burning any of it in a few of them. I would guess he was hearing the fuel blow through the exhaust... possibly while burning in the headers from the hot exhaust gases from the cylinders that were working.

Also, keep in mind that engines are just air pumps. If the cylinder doesn't fire, instead of a firm pulse, there is more of a steady stream of air. He could have just been hearing some unmodulated air moving around.

 

[bullitt boy]

I am only running a Vortech and I would never let a fuel filter go more than 15 k max. Can you? yeah sure you can but for $15 bucks why risk the headaches and the rest of the B/S that comes with getting no fuel on demand.

 

[Miracle]

Ok... since I am still having a problem, and since you have last heard from me, I replaced the fuel filter, as well as done an oil change, and another idle relearn.

I've narrowed it down to the last thing in the fuel system that I have yet to replace, the injectors.

The injectors are getting 39 psi at idle at the rail, so how do I (if there is a way to check) ensure the injectors are pushing the correct amount of fuel?

And wouldn't a vacuum leak cause my boost and hand vacuum gauges to flutter at idle, and have a lower reading than usual? It reads right about 17-18 PSI steady at idle. Doesn't fluctuate, doesn't move. And also, wouldn't a vacuum leak cause a wider range of cylinders to run lean, instead of just one bank?

I'm at a loss here guys, honestly.

 

[marcspaz]

Vac leaks don't pulse, but it would be lower on the gauge. You would also be short on boost, as what ever leaks under vac, leaks really bad under boost.

Unmetered air would have an impact on all cylinders.

The only way I know to test injectors at home is not very safe and requires 2 people.

Remove the fuel rails in tact. Unplug the COP's and all the injectors from the harness. Plug the injectors in 1 at a time (will need some long jumpers) and test them While you have the injector pointing into a "gas" approved container, have someone crank the engine over and look at the fuel pattern.

This page has samples of common patterns.

http://www.google.com/imgres?imgurl...mage_result&resnum=4&ct=image&ved=0CBkQ9QEwAw

Again, not safe, and don't suggest you try it... but you are an adult, so I leave it to you.

 

[Tom]

just go get retuned and call it a day.