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Engine starts then immediately dies (No codes)

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Old Apr 18, 2023 | 02:08 PM
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rikkd's Avatar
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Rock Crawling
Joined: Mar 2021
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From: sf bay / western oregon
Post Engine starts then immediately dies (No codes)

Well I had an eventful night. I was driving to get some food and when moving my phone to the dashboard my charger caught the shifter and my attempts to untangle it without looking failed. Managed to shift it to sport then gear 1 causing the engine to rev to 7,000 RPM. engine died and I coasted to a stop 1/4 a mile from campus. Of course my AAA had expired and forgot to renew so I was forced to figure out how to fix it on the side of the road.

Anyways here's a short write up on what happened as I haven't found much information on this.

Symptoms
7k rpm the engine died and coasted to a stop
Engine light comes on
On first restart check engine turns on and the engine dies. With the key in the second position check engine, battery, and oil light comes on. NO codes.
Observations
On 2nd and further restarts engine starts up just fine, hits 2k rpm and dies. I could use the throttle for maybe 1/2 a second before the ECU cuts it off.
No codes were present at any time, with a non GAP tool.
Hard reset didn't work.
Notes
After finding no faults I pulled relays and disconnected transmission temp sensor (rat chewed through it in February and put quick disconnects as I had them on hand) and that threw codes for that problem, and prevented starting. I think this is because that issue was either recognized first, or was a "priority problem" but after starting it died due to the issue at hand.
I did replace MAF 2 weeks ago after the original one starting having issues after 18 years.

Solution
MAF sensor was bad. I'm still looking into what part of the sensor failed. I swapped my old MAF and that got me up and running back to my parking spot. I did find online that it may a bad ground for the sensor but swapping it solved it so it must be a problem on the sensor. Correct me if this logic is wrong or ideas of what could have gone bad.

I'll update this when I have the time to dig deeper into the issue but for now this is what I've found.
 
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