2001 QX4 engine died 5 times in the Whataburger drive thru

Post by **Fosty** » Sun Aug 06, 2023 3:16 pm

Started back up again once I put it in park and turned off the key.
Battery and oil light come on, but the battery is still working because AC turns on and windows go up and down.

Here is a video of it happening after I got home (ignore the food munching)

What do you guys think it might be? I've heard it could be the Idle Air Control Valve, a transmission solenoid, or maybe even the fuel pump.

Post by **mdmellott** » Sun Aug 06, 2023 4:07 pm

The idle is steady and right at 750rpm where it should be so IACV is not likely. Not driving so transmission has got nothing to do with this. The battery and oil light come on because the car died. My guess is that it was choked out for lack fuel. At idle, your fuel pressure regulator should be wide open, sending most of the fuel delivered by the fuel pump, back into the fuel tank. A weak fuel pump will not create enough pressure to feed the engine. Misfires while driving with a weak fuel pump is typical but since you did not indicate that is happening, I can only guess. The way it choked out, I still think it might be a fuel delivery issue (weak pump, clogged filter, injector problem). Pressure test the fuel system and find out if that's the issue or not.

Post by **macgiver** » Sun Aug 06, 2023 4:09 pm

I think getting some streamed data , even codes scanning would help the "guys here " to zero in better for you , ask around , like I don't know IF you have a good 'data stream scanner" on you ? Tho

Post by **Fosty** » Sun Aug 06, 2023 4:26 pm

To be honest, I don't know what a misfire sounds or looks like, so I'm not sure if I'm experiencing it while driving. I changed the fuel filter this year, and also tested the injectors (albeit with a rather janky setup) this year too so I THINK they are okay.

I'll go do a code check in a minute. I didn't think to do it because I haven't got an engine light...yet.

Post by **macgiver** » Sun Aug 06, 2023 4:34 pm

Right - video shows an IMMEDIATE DROPPOUT ........like a 'spinal-cord hit' kinda quiet and very very abrupt ?? Is a "key".
My observation , now

I see misfire as a kind of " spitting / bumbling " while dropping out ? right ?........not your situation ??

Something just seems to cleanly , and VERY abruptly " LET GO "

p.s. was burger good ? Did it make up for some of this Szhitt ??

Post by **macgiver** » Sun Aug 06, 2023 6:08 pm

Also could be some kind MRI - like magnetic FIELD / EMP around the drivethrough , they take advantage of to SELL MORE " GREAT TASTING BURGERS " ? ( Samuel L Jackson

quote )
While your vehicle temporarily DEAD ? ?......................after all ...............ya finished yours IN the car ? Right ?
I'm just asking ...................ONLY at Whataburger............nah ......ya ????

Post by **macgiver** » Mon Aug 07, 2023 4:21 pm

Where again did you get that burgher ??
https://www.youtube.com/watch?v=Mnb_3ibUp38
a tasty drink....wash it down ... ??

Post by **Fosty** » Wed Aug 09, 2023 8:08 pm

Not getting any codes. A few times today at red lights it dropped down to 400 and shook a bit.

Also, I put a new MAF Sensor in a few months ago, so I don't think it's that. Air filter is still pretty new too.

Post by **mdmellott** » Wed Aug 09, 2023 9:57 pm

Pressure test the fuel system and find out if that's the issue or not. Here the the complete write up on how to do the fuel pressure tests.

Post by **Fosty** » Sun Aug 20, 2023 9:29 pm

So is this where I want to tie the fuel gauge in, or should it be before the damper?

Post by **mdmellott** » Sun Aug 20, 2023 10:16 pm

Fosty wrote: ↑
Sun Aug 20, 2023 9:29 pm
So is this where I want to tie the fuel gauge in, or should it be before the damper?

No. That's the vacuum line for the damper and there is no easy access to tap the line before the damper within the engine bay. As written up in the Haynes Repair Manual page I posted, tapping the fuel line at the fuel filter is the easiest access to installing the gauge.

Post by **mvmcali** » Tue Oct 03, 2023 7:41 pm

you know everybody read this post because of the whataburger reference

2001 QX4 engine died 5 times in the Whataburger drive thru

2001 QX4 engine died 5 times in the Whataburger drive thru

Re: 2001 QX4 engine died 5 times in the Whataburger drive thru

Re: 2001 QX4 engine died 5 times in the Whataburger drive thru

Re: 2001 QX4 engine died 5 times in the Whataburger drive thru

Re: 2001 QX4 engine died 5 times in the Whataburger drive thru

Re: 2001 QX4 engine died 5 times in the Whataburger drive thru

Re: 2001 QX4 engine died 5 times in the Whataburger drive thru

Re: 2001 QX4 engine died 5 times in the Whataburger drive thru

Re: 2001 QX4 engine died 5 times in the Whataburger drive thru

Re: 2001 QX4 engine died 5 times in the Whataburger drive thru

Re: 2001 QX4 engine died 5 times in the Whataburger drive thru

Re: 2001 QX4 engine died 5 times in the Whataburger drive thru

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