Have Toyota Questions? Ask a Mechanic for Answers ASAP
Hi, I’m Ron and I can help you.I have been in the auto repair business with my own shops since 1975 and also teach automotive repair. I am confident we can resolve your problem together. Please understand that I don't know your skill level. In most cases when you have a problem with the way the vehicle performs, specialized tooling is required to acquire computer data/information or engine testing results. We didn’t build these complicated vehicles; we just diagnose and fix them. Also understand that I can't see, smell, hear, or touch the vehicle either, so it may take a few replies to get to satisfactory results. I am also going to direct you with the fastest, easiest and most common things to check first. Please be patient and permit me to do what I do best.I also try to give all of the information you may need, expecting a “positive rating” in return. I will also continue assisting you after you have rated me, if necessary. If there is any reason I cannot get a positive rating, please let me know why “in advance”, so I can go.
Check for spark at the plugs when cranking it, check fuel pressure with a gauge, check compression for possible valve timing being off. This covers the bases for no starts.
Okay, then it's starving for fuel. Check the fuel pressure with a gauge to confirm. You can have a bad pump or no power to it.
Thanks again, and please don't forget to rate me and keep this link in case you need me again later on.
Intermittent connection causing a loss of power and possibly a sticking relay, happens ALL the time.
Check for power to the injectors with a NOID light, maybe the security system is causing this.
Let's go backwards a touch and acquire the data I asked you to get for me. We don't seem to be getting anywhere right now without some testing being done. I will also continue assisting you after you have rated me too.
testing needs to be done and results from the testing. Being that you're in the repair industry, surely you understand where I'm coming from. There's no magic here, and guesswork is expensive.
Hi, Im a Toyota master diagnostic technician currently working at a dealership. The previous expert has opted out of this session, so I will take over. First thing, Do you see the security light flashing on the dash when the key is OUT of the ignition?
Does it stop flashing when you put the key in the ignition? I just want to rule out the immobiliser. Were there ever ANY codes stored in the computer? Even history codes could be helpful.
Any chance you still have those code numbers?
Does this Sequoia have a 4.7l or 5.7l engine?
Have you removed the intake oil control valves and checked them manually to see if they are working? They need to be checked by manually moving the spool valve to see that it is not sticking, and also electrically to see that they move when energized.
The codes point to an issue with the variable valve timing system. There are 2 valves on each bank, one for intake and one for exhaust. The ones we need to check are the intake valves. They are in the valve covers on each side. There are literally hundreds of possibilities for what we have going on here, just need to go one step at a time.