1997 LS400 170K miles, Coolant Leaks, alternator not charging, ... - Page 3 - Club Lexus Forums


Go Back   Club Lexus Forums > Lexus Model Forums > LS Models > LS - 1st and 2nd Gen (1990-2000)
Log In 

1997 LS400 170K miles, Coolant Leaks, alternator not charging, ...

Reply
 
 
 
 
Thread Tools Search this Thread
Old 03-29-14, 05:56 PM   #31
ychen
Driver School Candidate
Trader Score: (0)
 
Join Date: May 2006
Location: TX
Posts: 27
Default

I am in big trouble now!! When I tried to remove the upper right (passenger side) freeze plug, it slipped off my channel plier and dropped down the pipe. It seems this plug is for the oil passage. Cowboy & other experts, where does the plug possibly go? From what I could see it dropped to the oil pump area or even down to the oil pan. I don't think I could leave it there since once the engine runs chances are it will hit and cause damage. Please help! Thanks in advance.
ychen is offline   Reply With Quote
Old 03-29-14, 09:16 PM   #32
LScowboyLS
Lexus Champion
Trader Score: (0)
 
Join Date: Dec 2011
Location: Birmingham, AL
Posts: 4,078
sixtek @vatoloco
Send a message via Yahoo to LScowboyLS
Default

yes, you have to get it out before turning crank (or starting engine of course)

but do not panic, it is not such a big deal to retrieve

you need a borescope to find where it went, and the right tool to retrieve it

I will post some links on where to buy these tools for a good deal in a few minutes

first check another one of the freeze plugs and determine whether it is ferrous (will a magnet stick to it?) and let me know

Last edited by LScowboyLS; 03-29-14 at 09:19 PM.
LScowboyLS is offline   Reply With Quote
Old 03-29-14, 09:26 PM   #33
LScowboyLS
Lexus Champion
Trader Score: (0)
 
Join Date: Dec 2011
Location: Birmingham, AL
Posts: 4,078
sixtek @vatoloco
Send a message via Yahoo to LScowboyLS
Default

cheap borescope - there are really nice ones out there if you are well off, they are handheld with a great camera, but the cheapie will work for this

pick-up retrieval tool
LScowboyLS is offline   Reply With Quote
Old 03-29-14, 10:16 PM   #34
ychen
Driver School Candidate
Trader Score: (0)
 
Join Date: May 2006
Location: TX
Posts: 27
Default

Thanks, Cowboy. Yes, the freeze plug is ferrous! I was able to make simple tool with a magnet to fish it out. Thanks again.
ychen is offline   Reply With Quote
Old 04-02-14, 12:13 AM   #35
ychen
Driver School Candidate
Trader Score: (0)
 
Join Date: May 2006
Location: TX
Posts: 27
Default

I replaced 3 freeze plugs (bought 4) (two corroded ones and another good one. Since the upper ones are for the oil passage, after removing the upper right one, It appeared that it was in perfect shape, so I skipped the upper left one). replaced 3 seals (2xcam+1crank). Also I replaced the P/S reservoir o-ring. Yesterday I drained the oil, I found the oil drain plug is not the OEM one. It has "1/2" in the cap of the bolt (see pic). My guess is that at some point the oil pan was stripped. Should I be concerned regarding the oil pan & the drain bolt? Thoughts? Thanks.
Attached Thumbnails
1997 LS400 170K miles, Coolant Leaks, alternator not charging, ...-img_8539.jpg  
ychen is offline   Reply With Quote
Old 04-02-14, 01:03 AM   #36
LScowboyLS
Lexus Champion
Trader Score: (0)
 
Join Date: Dec 2011
Location: Birmingham, AL
Posts: 4,078
sixtek @vatoloco
Send a message via Yahoo to LScowboyLS
Default

the real question is does the current drain bolt/gasket setup leak now, and will it leak after future oil changes, if it doesn't leak now or start leaking in the future, then replacing the oil pan is not necessary. Unless it just bugs you to have a standard rather than a metric fastener on your car in a commonly accessed place, assuming that is what it even is. Did you measure it and verify that the 1/2 on the fastener is indeed referring to 1/2" ? - I have some doubt, because fasteners almost never have their head size printed on them but sometimes the thread diameter is. (i.e. it could be 1/2" thread diameter, but that would be one meaty drain bolt!)

Last edited by LScowboyLS; 04-02-14 at 01:13 AM.
LScowboyLS is offline   Reply With Quote
Old 04-20-14, 04:53 PM   #37
ychen
Driver School Candidate
Trader Score: (0)
 
Join Date: May 2006
Location: TX
Posts: 27
Default

I finally have put together everything together. New timing belt, Water pump & etc. Coolant leak has been fixed. Alternator has been fixed as well. When I tried to start today, it cranks, but won't start. A little refresh of the memory. When I bought the car 4 month ago, the car did not start easily. For example, it won't start the night before, an then it starts fine next mooring. Any suggestions would be greatly appreciated.
ychen is offline   Reply With Quote
Old 05-24-14, 11:15 AM   #38
ychen
Driver School Candidate
Trader Score: (0)
 
Join Date: May 2006
Location: TX
Posts: 27
Default

The car starts fine now. It was due to the distributor rotor being 180 degree off. Now I am trying to resolve the error code P1600. I have changed the ECU capacitors with the recommended capacitors by Cowboy & Yamae. But the error code P1600 remains. Also the idle is low (500-600 rpm). It often dies when braking. Another problem is that I can't fill the gas tank up. I can only fill a couple of gallons of gas. Any help would be greatly appreciated.
ychen is offline   Reply With Quote
Old 05-24-14, 03:52 PM   #39
Yamae
Lexus Test Driver
Trader Score: (0)
 
Join Date: Aug 2011
Location: Japan
Posts: 1,238
Default

The code P1600 is generated when the back-up memory power supply circuit is not functioning.
To fix this needs a special skill analyzing the regulator circuit if the +B is properly supplied to the ECU terminal. Amateur DIYers only can make up to check the voltage at the terminal.
Yamae is offline   Reply With Quote
Old 05-24-14, 04:48 PM   #40
ychen
Driver School Candidate
Trader Score: (0)
 
Join Date: May 2006
Location: TX
Posts: 27
Default

Thanks for the info. I bought another ECU from another 97 LS400. But I can't test it since 97 requires flashing. So my options is limited: Either send the current ECU to repair or try with the spare ECU and flash the key. Plus the spare ECU doesn't appear to be any better. In fact the spare one has more leak at capacitor C120.
ychen is offline   Reply With Quote
Old 05-24-14, 06:02 PM   #41
Yamae
Lexus Test Driver
Trader Score: (0)
 
Join Date: Aug 2011
Location: Japan
Posts: 1,238
Default

It has been already 17 years since the car was made and it is natural that those capacitors are not in good condition anymore especially at places where the temperature is high. You can't expect a lot for a used ECU and also a 97 needs to rewrite the key code.

Did you already check the voltage at the pin #14 of connector A of the ECU? It is coming from the EFI fuse and it should be at the same DC level with the battery or a bit low. Less than 10V there often causes the P1600 problem. If it's higher than 10V, you need to check inside of the ECU but this needs an extra skill.
Yamae is offline   Reply With Quote
Old 05-24-14, 10:27 PM   #42
ychen
Driver School Candidate
Trader Score: (0)
 
Join Date: May 2006
Location: TX
Posts: 27
Default

No, I have not checked the voltage of #14 pin in connector A. I don't know how to check it. Is connector A the larger one of the 4 connectors? How do you identify #14? Thanks.
ychen is offline   Reply With Quote
Old 05-25-14, 01:10 AM   #43
Yamae
Lexus Test Driver
Trader Score: (0)
 
Join Date: Aug 2011
Location: Japan
Posts: 1,238
Default

That's the basic first step. If you can't act, you'd better ask a tec who can do it. The second step is much harder.
Yamae is offline   Reply With Quote
Old 05-25-14, 03:14 PM   #44
ychen
Driver School Candidate
Trader Score: (0)
 
Join Date: May 2006
Location: TX
Posts: 27
Default

Ok, I did the test of the voltage according to this http://us.lexusownersclub.com/forums...-trouble-code/. I has a voltage of 12.5v. So the harness is good. I opened the ECU again, I notice there is some corrosion at the pin next to the pin I tested (but not at the pin tested). what's my potion, clean up the corrosion? Would cleaning solve the problem? Thanks again.
Attached Thumbnails
1997 LS400 170K miles, Coolant Leaks, alternator not charging, ...-img_8676.jpg  
ychen is offline   Reply With Quote
Old 05-27-14, 10:39 PM   #45
ychen
Driver School Candidate
Trader Score: (0)
 
Join Date: May 2006
Location: TX
Posts: 27
Default

In addition to error code P1600, it misfires. I was hoping the new capacitors would resolve the misfire problem. I just did a compression test today. All cylinders except cylinder #3 have 180+ PSI. When I tested cylinder #3, it would just continue one crank without stopping. Does this mean the valve is bad? I think the valve was bad before I changed the T-B. I was very certain that I did not bend the valve when I did the T-B. Before the T-B, the car had two coolant leaks (freeze plugs), Should I have performed the compression test before the T-B. Also, the old timing belt had cracks, but not broken and the engine ran (but poorly). So how did the valves at #3 cylinder get damaged? Overheat maybe, But then again, the engine doesn't appear to be leaking any longer. One more thing, though, I did notice that some water comes from the exhaust pipe when I first started it in the morning a few times. Head gasket blown (maybe) which caused the valve damage? I have wasted 6 months and $400 poorer? Any thoughts? Thanks in advance.
ychen is offline   Reply With Quote
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Water pump took a vacation... RainaES350 ES - 5th Gen (2007-2012) 12 06-01-15 11:02 PM
Coolant leak from back of engine DonMolina LS - 3rd Gen (2001-2006) 2 07-01-14 05:32 AM
1997 LS400 Won't start ychen LS - 1st and 2nd Gen (1990-2000) 0 04-20-14 06:42 PM
2000 GS400 transmission fluid ATF leak from dipstick filler pipe year2000 GS - 2nd Gen (1998-2005) 5 02-17-14 10:42 PM
06 RX330 Coolant Leakage richonline RX - 1st Gen (1999-2003) 8 10-11-13 12:48 AM


Tags
1997, 400, alternator, bad, coolant, coolany, killing, leak, lecus, lexus, ls, places, power, pump, steering

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -7. The time now is 12:18 PM.

Copyright © 2000-2015 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS