2008 SR5 Crew Max 5.7 - cranks but won’t start

Truck cranks over, 4 lo flashes and no communication to the OBII. Let it sit awhile it’ll start right up. Any advice would be awesome!!

Thanks!

 

Welcome from Ontario Canada , one of these great people will probably be able to give you some advise .

 

have your battery tested, do you have an immobilizer/alarm??

 

I have tried multiple keys and battery tests good. The blinking key light is. It flashing when the key is in the ignition.

 

Flex fuel? Could be the fuel pump. Mine is slow to start, but starts because of that issue.

 

Not guaranteed to work, but try to turn off the alarm, from what I was instructed place the key in the ignition and turn it over to ON, but don't turn it over. Do this quickly 3 times. If done correctly the red light on the left hand side of the dash will be flashing quickly as if the alarm was set off, but its just placing in the off-standby position.

Now try and turn it over and see if it starts this way.

To reactivated do the same 2 times and it will stop flashing and will reactivate your alarm.

 

I think flex fuels were offered later on, after the face lift, if I'm not mistaken. Roughly 2010-13,

 

It is not a flex fuel!

I will try turning the key and see what happens! Just weird, started today just fine, drove it 4 blocks and now wont start again.

 

how many miles on it??

Edit: Does it actually crank? or does it click and nothing happens??

 

Is sounds like the fuel pump.

 

90k. I would think fuel pump too but it won’t connect to OBDII and 4lo flashes. I’d also think it would have failed by now, this has been happening for about a year. I don’t drive the truck much at all. Maybe 3-4K a year.

 

Actually sounds electrical

Try this out... first video is the first thing I was able to pull up, I don't personally follow this cat, but its a good start and idea for what you may need to troubleshoot. Second link is to another Tundra site, but its for an 01 which break it more down, third link shows ways to read codes without a scanner... did you buy the truck used??
https://www.youtube.com/watch?v=IiIPyPiBc4g\ https://www.tundras.com/threads/rea...can-tool-2nd-gen-and-more.62732/#post-1641559

 

Yes I bought the truck used and has quite a few add ones, which are all electrical. Remote start, stereo, heated seats, flip down running boards, and TV in the head rests. The only thing I wonder is I’ve read trucks having the same issue that are all stock and mine has had all this stuff done for the last 60k miles.

I’ll watch those videos. Thanks a lot!!

 

check behind the obd2, some dealers add a gps link to used vehicles as well as vehicle disable devices on the starters, so they'll also attach a secondary obd2 connection and push the stock one back in the dash. A way for easy recovery for repos. Have fun.

https://www.youtube.com/watch?v=EiPFL8N8IwU

https://www.youtube.com/watch?v=wltkNDFKb28