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Hi wallen and chip, I"ll check the ignition switch next time I'm in the garage, but have already tried the "wiggle the key" test and it didn't have any effect. There's actually nothing hanging off the key, my wife just uses the bare key, no key ring. I'm in Plano (north of Dallas).
As to troubleshooting, the Lexus dealer wants $100 just to look at it, with diagnostics going up from there at $120 per hour, so I'm going to keep plugging away at this for a while before going that route. Thanks for your suggestions; keep 'em coming!!!
If you were in Houston, I could recommend an independent shop that I know would be able to properly troubleshoot and fix the problem (not simply throw parts at it and get lucky ).
The ignition switch is one of the few things I can think of that could cause both intermittent no-crank and stalling problems. It might take more than a wiggle test
Edit: Are there any engine performance or drivability issues once started and running?
Hey wallen,
Interesting; didn't think a bad ignition switch could cause stalling....How can it do that?? Will definitely check that. Wish I knew of an honest shop up here; most don't know any more about the car than I do, which is pretty sad! I've got a couple of guys that I have fix things on my Suburban that I don't want to mess with, but the wife's dang Lexus is a different beast.....
Engine stalling without turning on the check engine light, the first thing that comes to mind is a crankshaft position sensor. However a failing CKP sensor will not cause a no-crank problem.
Failing electrical contacts within the IGN switch can mimic a switch that has been physically turned off.
I have to plead some ignorance with Lexus, as most of my knowledge is with the German built stuff. But the basics are the same (or awfully similar ).
Edit: I'm not saying the switch is the problem, it's just where I would start (no pun intended).
Using a test light and checking for power at the input of the starter relay, while a helper moves the key to the "start" position is a relatively quick test. If you don't get power here, then move to the IGN switch.
I recently bought Lexus GX 470 and I have the exact same problem as you. I would like to know what was done or if it was resolved? I have no idea how to fix it and I would appreciate a response for help.
Yes dying issues can be many from Battery dying, ECM dying , Start Generator slowly dying or Fuel Filter being clogged, Fuel delivery flow lines clogged, Fuel Injectors clogged, the Port fuel Flow injection may experience clogging, Low fuel pressure from the tank, low Fuel Pump resistance. You will never get Warning or any codes on the ECM. I have been thru this. I had to start from the MAF and then slowly go all the way and found that the Fuel pressure was fine but not delivering enough volume to compensate and the fuel lines were clogged with some white sediments. I had to clean the entire Fuel Tank assy, the fuel breather pipes The fuel suction pump, the connectors , I had to replace the retainers as they broke along while disconnection. There was a bit of debris within the tank. Completed the fuel tank job and the others connected to fuel delivery to the engine. And the truck began to run smooth since then.
I had exhausted all options and then finally this nailed the issue. Maybe not you will have the same issue like mine, but you have quoted was similar to the defects I had.
Fortunately, this is a common source of what you describe: A non-click, no start after the car has been driven and gotten hot, then it will start once it is allowed to cool. Unfortunately I put in a new starter motor on my GX470 only to drive away from the shop to have it not start when I stopped in at the Grocery Store - right after I drove from the auto shop. Fortunately TNT Auto Repair came and got the car, and while it would not start, they were able to attempt a diagnostic on the car, only to find that they could not get the car to communicate. From there the mechanic was able to test to see if any juice was coming out of the port, nothing, so they immediately suspected a blown fuse. Fortunately for me, they only spent a half hour researching this before they found the blown fuse. New fuse a 69 cent part the size of a kernel of corn, and the car runs and starts up just fine. I took a pic of the fuse and the shop that quickly found it. I have read horror stories of cars sitting at the dealership for days while they searched for the cause of the non-start charging people $120 per hour.. yikes! Start with the fuse first, it is the cheapest and I have several forums where people found out it was their fuse too.. i.e. http://www.clublexus.com/forums/gx-1...starter-2.html
I hope this is my only electrical issue. Mine has happened 3 times since September. It always seems to be during the heat of the day, but sometimes with less than 5 minutes of driving. My fuse has not blown, but take a look at it. It is well worn on 1 "prong" (when standing on the driver side, this is the Right-Hand side of the fuse) and barely scratched on the other (L-H side). I wonder if the "contacts" in the fuse box are out of spec, and need to be cinched tighter... What do you think? And I have not yet checked if the other fuses look like they wear unevenly like this.
I apologize for the poor quality of the close-ups with my cheap phone camera.
Just replace it, they are 69 cents at Kragen... Your fuse looks like it got hot and melted, so it probably is the source of your problem as there is not a good connection..
08-23-14, 01:01 PM
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It is a burnt out EFI Fuse
