Repair-It

This one supports a bunch of GDI types. I wonder if this would've avoided the need for me to replace the Audi injectors and I could've just done the cleaning...

https://www.amazon.com/dp/B0DNW2D9NP/re ... F0aWM&th=1

rpaoness wrote: ↑Thu Mar 06, 2025 4:34 pmWhat I still can't quite figure out is why it will crank for 15-20 seconds when it's at its worst and not fire. High injector pulse width prevents the rail from building pressure, therefore no atomization, therefore no fumes, just dribbling liquid? Weird.

I would chalk it up to the mixture being all over the place and taking some time to stabilize at a normal cranking mixture to finally fire.

rpaoness wrote: ↑Thu Mar 06, 2025 4:34 pm
Based on the "gross" nature of rapid pressure loss and no indication of gasoline smell in or near the throttle body or intake manifold I believe leads me to the fuel pump check valve. Probably not worth sending the injectors out for cleaning/testing. Or could have them cleaned/tested just "because" and then only do the pump after they are confirmed good.

Yes I would probably target the fuel pump at this point.

rpaoness wrote: ↑Thu Mar 06, 2025 7:19 pm This one supports a bunch of GDI types. I wonder if this would've avoided the need for me to replace the Audi injectors and I could've just done the cleaning...

https://www.amazon.com/dp/B0DNW2D9NP/re ... F0aWM&th=1

I've seen these appear on certain youtube channels. It's cool but really unless you are cycling multiple used cars through I don't know that I'd buy a machine just for a specific issue even if the math seems to work out. I'd rather have either a new or rebuilt injector I guess with some kind of guarantee behind it. $370 isn't really impulse buy territory for me at all (get it?).

kevm14 wrote: ↑Fri Mar 07, 2025 5:26 am

rpaoness wrote: ↑Thu Mar 06, 2025 4:34 pmWhat I still can't quite figure out is why it will crank for 15-20 seconds when it's at its worst and not fire. High injector pulse width prevents the rail from building pressure, therefore no atomization, therefore no fumes, just dribbling liquid? Weird.

I would chalk it up to the mixture being all over the place and taking some time to stabilize at a normal cranking mixture to finally fire.

rpaoness wrote: ↑Thu Mar 06, 2025 4:34 pm
Based on the "gross" nature of rapid pressure loss and no indication of gasoline smell in or near the throttle body or intake manifold I believe leads me to the fuel pump check valve. Probably not worth sending the injectors out for cleaning/testing. Or could have them cleaned/tested just "because" and then only do the pump after they are confirmed good.

Yes I would probably target the fuel pump at this point.

I just find it weird that it doesn't really even cough or pop, just no fire at all until you stop cranking and then initiate another crank cycle. Always fires immediately on the second crank cycle.

Oh. That's probably just pulling spark because it was unhappy with how things were going (to meet startup emissions regs).

With pushbutton start and only auto-crank, why would it continue spinning the engine over if it "knows" it pulled spark?

Can't answer that.

I bought and inserted a ball valve in the tester so I could isolate the fuel pump check valve vs. dribbling injector. Confirmed it's on the fuel-pump side.

I can order a:
- Delphi pump from RockAuto for $197
- 5145585AB MOPAR pump (PN 5145585AB - says flex fuel, but it really means just "primary", not including secondary pickup) for $274 (although it's PN revision "AB", "AE" [MOPAR number rev's are serial, AB, AC, AD, etc.] from RockAuto
- 5145585AE MOPAR pump for $278 from these guys: https://www.mopar-direct.com/oem-parts/ ... -5145585ae

Based on how close those are in price, I'm not sure where to go. Lifetime warranty on Delphi, 2-year warranty on MOPARs...

I think I'm really between the "AE" MOPAR pump and the Delphi pump. Unless RockAuto stock is really the AE pump and they just haven't updated their listings.

Interesting the RockAuto site says alternate inventory numbers that include the AE:

"{Alternate Inventory Numbers: 05145585AD, 5145585AD, 5145585AE, 5145585AC, 05145585AC}"

https://www.rockauto.com/en/moreinfo.ph ... 7&jsn=1251

I ordered the mopar-direct one hoping to get an AE (or later) pump. $276.