Misfiring/No Start After Long Drive (10 Viewers)

[NeedaLX]

2006 LX 470 with 93,000. At the end of a 450 mile, 9 hour drive it starts misfiring. This occurred specifically after 45 mins-1 hour in stop and go traffic in 90 degrees heat

I don't recall exactly if I cut the engine off or it died but it wouldn't start back up. After 1 hour of waiting for a tow I decide to to try and start it again. It started up immediately with no misfire or engine lights

From there I had it towed straight to a shop that I was planning on taking it to next week for maintenance items (timing belt being one). I'll find out more next week but mainly curious what others think it could be in the meantime

The temp gauge was good at the time of misfires. My initial thought and what I'm hoping for is that the truck is on the original plugs still and a coil went bad. I only have myself to blame if that was the case

I'll report back any findings..

 

[OEMGUY0720]

Are you able to plug in an OBD reader and pull codes?

 

[NeedaLX]

Are you able to plug in an OBD reader and pull codes?

No, I had it towed straight to a shop that I was scheduled to take it to on Monday

Just wondering what it sounds like it was, to others familiar with this platform (which I realize could be a lot of things). I should have a proper diagnosis in the next day or two

I'll be honest, when it occurred my mind immediately jumped to the worst case scenario (timing belt let loose). Getting it to restart with no CEL made me feel a lot better

 

[OEMGUY0720]

Hopefully it’s not a timing tooth jump related issue. It can be one of 06/07 related misfire issues that can be attributed to fuel delivery - fuel pump / fuel filter / fuel injectors, or O2 sensor related, or MAF/vacuum hoses related one causing bank1/2 system lean (not enough air-to-fuel mixture).

 

[NeedaLX]

Hopefully it’s not a timing tooth jump related issue.

Well now I'm worried again

Could it start again seemingly fine if timing related?

It can be one of 06/07 related misfire issues that can be attributed to fuel delivery - fuel pump / fuel filter / fuel injectors, or O2 sensor related, or MAF/vacuum hoses related one causing bank1/2 system lean (not enough air-to-fuel mixture).

Was going to be my next guess

I assume the long running time/heat to be a contributing factor in the issue

 

[2001LC]

06-07 have a weak fuel pump. The way to test: Is best on a hot sunny day ~90f, accelerate (climb hill, entering HWY, passing, etc.) getting RPMs over 3K (fuel pump, is put into high speed) and hold that RPM for a few minutes or more. Let off gas pedal dropping RPM below 2K. Engine dies! Dies from fuel starvation. If watching fuel trims, they be very lean after RPM drop. Often if one, scans for DTC (codes) check, before IG key turned off. We'll see BK1 and BK2 lean DTC.

We park a let cool down ~20 minutes. Engine start and runs fine.

 

[OEMGUY0720]

Well now I'm worried again

Could it start again seemingly fine if timing related?

Yes, “if” it had skipped timing that can easily be readjusted back to factory spec. If you’re doing it by yourself, you will need an SST aka Special/Specific Service Tool - but thats after you cross the bridge.

Was going to be my next guess

I assume the long running time/heat to be a contributing factor in the issue

It’s likely those wear items, considering your truck’s mileage is still sub 100k mileage. Every summer season we get all sorts of fuel delivery-related and misfiring-related concerns, and it has become a typical trend here in the forums also seeing the 100 series going in to the 2 decade mark.
Basic checklist:
•check fuel pump
•check fuel filter
•check gas cap (should not smell strong fuel vapor smell after a drive -indicates gas cap is not venting properly, just replace it with OEM).
•check MAF (try known good MAF)
•check vacuum hose lines (should be leak-free)
•check airbox and intake hoses for any cracks especially between the MAF and throttle body.

Advanced checklist:
•check spark plugs and coils
•check injectors
•check throttle body

 

[NeedaLX]

Now we're talking. Anything but a catastrophic engine problem please lol

I'm eager to find out. On one hand it was some pretty bad timing for this to occur...

On the other, glad the problem presented itself. Better than it happening on a true vacation or a trip where getting it sorted would be an issue

 

[SLiggwood]

I had similar issues in 06 LX.
Fuel pump fixed it.
Cheap and easy.