The Q stranded me tonight!

[PopPop]

For the first time the Q left me stranded me tonight! Was raining and stuck in slow moving traffic when all of a sudden when I hit the gas pedal the Q started to mis and stumble. I pulled over and tried to find a good place to park and could smell strong gas fumes. Also U could see the richness coming from the exhaust. Pull over and parked and Idle went up and down up and down shut car off. Re-started car and U could smell raw gas inside of the car it was so strong. Shut down and looked under hood and nothing visually but when I tried to re-start this time Q would not start. Just turns over but would not fire. Let me know what U think before I start diging and checking for Codes on Saturday. No check engine light either!

[elwesso]

IM wondering if an injector O ring went awry on you... obviously something is causing a ton of fuel to dump into the cylinders... Id suspect a faulty O ring for starters..

[Q45tech]

MAF connector or MAF internal...................Of course biased since we never see injector oring or injector failures.

[PopPop]

MAF connector or MAF internal...................Of course biased since we never see injector oring or injector failures.

So D U think that I should check Airflow meter and connection and then go from there? MAF was my first guess but, the strong fuel smell threw me off. I have a couple of these in my trunk anyway so I will try this and pull codes there after. Any other suggestions welcomed D and others. Just wish this rain would lift . I'm trying to avoid towing my Q home but, I will see once I get back to where it's at.

[PopPop]

I went back to my Q yesterday and changed out the MAF and it ran ok. Checked codes only got the 55 which what I was hoping for. I checked fuel pressure after the fuel filter and got 44 PSI on fuel pressure. I remember 34 and 43 PSI for the Q's fuel pressure so is 44 PSI high for normal FP readings or is the 44PSI what U obtain when U run the vacuum test on the regulator. If 44 PSI is a high reading then it maybe time to replace regulator don't U think or is this normal range. Plus what is the proper setting for the IAC turns out on adjustment screws on a bone stock Q and does this change if using a Nico ECU. I'm stock as of now!

[elwesso]

did you just check it with priming the fuel pump? or was that at idle?

so it did end up being the MAF?

[PopPop]

did you just check it with priming the fuel pump? or was that at idle?

so it did end up being the MAF?

Wes it was at Idle after I had released Fuel pressure with fuse removal and priming and restarting. Yes MAF got it started and back on the road just curious about the fuel pressure

[maxnix]

Plus what is the proper setting for the IAC turns out on adjustment screws on a bone stock Q and does this change if using a Nico ECU. I'm stock as of now!

2.5 ±.5 turns out regardless of ECU, which don't change anything below 2500 rpm.

[PopPop]

Thanks B!

2.5 ±.5 turns out regardless of ECU, which don't change anything below 2500 rpm.

[Q45tech]

If it takes more than 3.5 turns out from bottomed, then there is not standard [low air] flow under the closed throttle plate [dirty TB].

The air has only 2 normal ways into plenum at idle [under Throttle plate or thru IAC]........... at cruise PCV and EGR are additional air paths.

Actually PCV can add a small amount of air at idle [kind of rpm dependent] fast idle could be like cruise vs warm idle minor amount.

[PopPop]

If it takes more than 3.5 turns out from bottomed, then there is not standard [low air] flow under the closed throttle plate [dirty TB].

The air has only 2 normal ways into plenum at idle [under Throttle plate or thru IAC]........... at cruise PCV and EGR are additional air paths.

Actually PCV can add a small amount of air at idle [kind of rpm dependent] fast idle could be like cruise vs warm idle minor amount.

If It takes more than 3.5 turns out from the bottom to acheive what D? I know on some other models I have worked on they don't recommend U adjust IAC until 10 minutes or more has passed at initial start up and depending on air temp. U are probably like me in that when I take something apart especially my own I take extra care in replacing or atleast cleaning all dirty parts before reassembling.

[texasoil]

a failed (leaking) fuel pressure regulator will dump LOTS and LOTS of fuel into the intake manifold. You would be astonished how much gasoline will flow through a 1/8" vacuum line with 30 psig pushing it.