2004 Lexus LX470 Is Haunted... (also timing belt stuff)

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As per the usual arrangement, of course I can't have any peace during christmas. Coming back 2 nights ago from christmas shopping with the family, front A/C on, rear A/C on, high beams on, horn working, and then suddenly the car starts the dreaded "low voltage" beeping, center console TV starts flickering on and off, A/C starts pulling power, horn pitch goes down and basically isn't working anymore, generally everything electric stops working properly and it looks like the car is haunted (oddly enough the high beams never dim even a bit). This happened (although with differing symptoms) a few months ago and cleaning battery terminals and negative terminal ground cleared it up immediately but I don't think that will cut it this time.

I'm speculating it's the alternator: usually the voltage is sitting at 14v on the dash but this time (when all the electrical madness was taking place) the voltage dropped down to 9v and would fluctuate up to 14v as you build up engine power (i.e. as RPMs increased). My dad said this could happen when the accessory belt is slack and I don't know when or how that could have happened basically during the same trip. We were out and about for a good half of the day with the A/C on full blast the whole time and there was never an issue. And then just as we are nearing home, all this madness occurs as we are sitting in traffic.

Also worth noting that sometimes (this has only happened 3 times) when I step on the gas all the way down and the engine fires up to the max, it's worth noting that a grinding sound occurs, not grinding per se, but like gnashing? Each time it happened I immediately let off and the noise would follow suit and stop. It's hard to describe but it sounds like it could be a belt or pulley that's out of whack and vibrating in a way it shouldn't be. There's a big question mark there for me.

I tried separating everything into paragraphs to organize my thoughts. What could be causing the electrical haunting? How is my theory on the alternator angle of this looking? Should I take off the accessory belt and inspect it along with all the pulleys? As usual I'm more or less completely noob at this so hand-holding will be much appreciated.

P.S. It's time to change the timing belt. If anyone has done this before, do you think it's a fairly easy DIY job? Timing is something you have to be super careful about, and if you know the horrors I've endured in the past due to lack of care, you will know that I do NOT want anyone else doing this job but at the same time I don't want to spend 3 days doing it only to rush on the last step and **** up.
 
Sounds a lot like a bad alternator. I would replace it and the belt, and spin the idler pulleys and check for any noise. You can change the alternator without digging into the timing belt stuff.
 
Welp, just my luck then. I know I can replace the alternator without touching the timing belt, the timing belt is kinda just its own different thing.
 
P.S. It's time to change the timing belt. If anyone has done this before, do you think it's a fairly easy DIY job? Timing is something you have to be super careful about, and if you know the horrors I've endured in the past due to lack of care, you will know that I do NOT want anyone else doing this job but at the same time I don't want to spend 3 days doing it only to rush on the last step and f*** up.

If you know your way around the tools it's not that bad of a job. Slow and steady (and meticulous) puts you at around the 8hr mark.

Easy to pre-game, which speeds things up a ton: .
That's part 1, and there are more videos in the series (2 parts I think, with maybe one or two tips videos also.)

Can't be as bad as a steering rack! :rofl:
 
Before you get in too deep it might be a good idea to have your battery tested….

^^^ This. I've seen a shorted battery cause all kinds of electrical gremlins.
 
Before you get in too deep it might be a good idea to have your battery tested….
Yeah, I'm planning on doing that. We've had that battery on the car for over 2 years now so will definitely get it checked first.
Can't be as bad as a steering rack! :rofl:
Thanks for the vid and time estimate and don't remind me lmao.
 
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As per the usual arrangement, of course I can't have any peace during christmas. Coming back 2 nights ago from christmas shopping with the family, front A/C on, rear A/C on, high beams on, horn working, and then suddenly the car starts the dreaded "low voltage" beeping, center console TV starts flickering on and off, A/C starts pulling power, horn pitch goes down and basically isn't working anymore, generally everything electric stops working properly and it looks like the car is haunted (oddly enough the high beams never dim even a bit). This happened (although with differing symptoms) a few months ago and cleaning battery terminals and negative terminal ground cleared it up immediately but I don't think that will cut it this time.

I'm speculating it's the alternator: usually the voltage is sitting at 14v on the dash but this time (when all the electrical madness was taking place) the voltage dropped down to 9v and would fluctuate up to 14v as you build up engine power (i.e. as RPMs increased). My dad said this could happen when the accessory belt is slack and I don't know when or how that could have happened basically during the same trip. We were out and about for a good half of the day with the A/C on full blast the whole time and there was never an issue. And then just as we are nearing home, all this madness occurs as we are sitting in traffic.

Also worth noting that sometimes (this has only happened 3 times) when I step on the gas all the way down and the engine fires up to the max, it's worth noting that a grinding sound occurs, not grinding per se, but like gnashing? Each time it happened I immediately let off and the noise would follow suit and stop. It's hard to describe but it sounds like it could be a belt or pulley that's out of whack and vibrating in a way it shouldn't be. There's a big question mark there for me.

I tried separating everything into paragraphs to organize my thoughts. What could be causing the electrical haunting? How is my theory on the alternator angle of this looking? Should I take off the accessory belt and inspect it along with all the pulleys? As usual I'm more or less completely noob at this so hand-holding will be much appreciated.

P.S. It's time to change the timing belt. If anyone has done this before, do you think it's a fairly easy DIY job? Timing is something you have to be super careful about, and if you know the horrors I've endured in the past due to lack of care, you will know that I do NOT want anyone else doing this job but at the same time I don't want to spend 3 days doing it only to rush on the last step and f*** up.
Had that happen to a Highlander once and it was a bad battery that caused it.
 
Had that happen to a Highlander once and it was a bad battery that caused it.
Noice. I mean bad for the Highlander but at least it doesn't have to be the alternator. The battery has been on the car for over 2 years at this point, I haven't done any further investigation on this issue because the car's been behaving and I'm doing the "stick my head in sand, hope it all goes away" trick. Working so far. :hmm:
 
Noice. I mean bad for the Highlander but at least it doesn't have to be the alternator. The battery has been on the car for over 2 years at this point, I haven't done any further investigation on this issue because the car's been behaving and I'm doing the "stick my head in sand, hope it all goes away" trick. Working so far. :hmm:
Still playing at being an ostrich or were the guys right about it being the battery?
 
I've had a loose negative battery terminal cause all of the above. Made my day when I realized that was all it was!
 
Still playing at being an ostrich or were the guys right about it being the battery?
Oddly enough, being an ostrich isn't so bad. Car's been working fine. Voltage gauge is still fluctuating with the revs, but I guess it can be overlooked if everything is working normally at face value.
 
Ok, so being an ostrich isn't the best. Stuck in a gridlock for about an hour last night with the high beams on the whole time. At the end of the hour, when we were about the take our exit off the blocked up highway, the car nearly died, screen was flickering on and off, interior button lighting was flickering, however, we weren't getting any beeping like I originally described. The voltage gauge was reading (probably below) 9 volts and the red battery light on the dash came on. I turned off all headlights, even turning on turn signals almost killed it (the batery). So I had to wing it off the highway and as soon as I was building revs up (because road space beget road use in my country), the gauge climbed back to 14 volts and everything was apparently normal for the rest of the way home. Alternator or nah? Got a mini-VCI cable in today so we'll see what we will I guess.
 

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