460 engine problems
Thread Starter
Pole Position
Joined: Nov 2001
Posts: 318
Likes: 0
From: Hamburg, Germany
460 engine problems
Hi,
I know this is the LS forum, but i guess this engine is more common in the LS than the GS.
Car is a 2010 Lexus GS460 180k miles.
My engine keeps stalling when engine is hot. No warning lights, reading errors says running lean. Sometimes it has trouble starting only with the accelarator pushed the engine stays on.
The car trys to keep the engine running but at idle speed the car stalls,
Revving the hell out of it solves the problem for a short time.
Errors are bad cats, running lean.
Maf changed
Temp sensor changed
fuel pump changed
throttle body changed
spark plugs changed
Christian
Any hints?
Thanks Chris
I know this is the LS forum, but i guess this engine is more common in the LS than the GS.
Car is a 2010 Lexus GS460 180k miles.
My engine keeps stalling when engine is hot. No warning lights, reading errors says running lean. Sometimes it has trouble starting only with the accelarator pushed the engine stays on.
The car trys to keep the engine running but at idle speed the car stalls,
Revving the hell out of it solves the problem for a short time.
Errors are bad cats, running lean.
Maf changed
Temp sensor changed
fuel pump changed
throttle body changed
spark plugs changed
Christian
Any hints?
Thanks Chris
CL Community Team
Joined: Mar 2007
Posts: 4,264
Likes: 481
From: MA
My wife's Jag had this problem at around 165K miles. My mechanic did a smoke test and it turned out the gasket(s) to the intake manifold was shot.
Pole Position
Joined: Oct 2014
Posts: 2,561
Likes: 365
From: New Hampshire
Sounds like a vacuum leak that only occurs when the engine is hot, so something is expanding when it's hot and revealing a leak and then contracts when it's cold and closes the leak...cracked intake? Intake gaskets? Exhaust manifold?
Trending Topics
Pole Position
Joined: Oct 2014
Posts: 2,561
Likes: 365
From: New Hampshire
If the cats are bad - in the sense that they aren't functioning - then the post o2 sensors/sensor, wouldn't fluctuate, it would stay a little too steady. You'd need a scan tool to know if that's happening. I suppose you could you use an infrared thermometer to measure the temps of the exhaust pre and post cats, that would help you determine if they are "working", but it wouldn't be as accurate.
A lean condition could cause problems with your o2 sensors, then again bad 02 sensors could cause a lean condition. And an exhaust leak could also cause your o2 sensors to interpret your engine as lean, when it's really just your exhaust (causing driveability issues).
I'd have someone hook a scan tool up to it and see what's going on. Then I'd like to have them smoke test my exhaust and intake to check for leaks.
ClubLexus Stories
Celebrating Lexus & Toyota from Around the Globe
8 Tips for Improving Your Hybrid or Plug-in Hybrid's Efficiency!
Michael S. Palmer
10 Best Lexus Models No One Remembers
Joe Kucinski
TRD Off-Road Premium: Best 2026 4Runner, Except This One Thing
Michael S. Palmer
Top 10 Lexus & Toyotas to Drive Before You Die!
Joe Kucinski
Top 10 Lexus/Toyotas With The LEAST 5-Year Depreciation
Joe Kucinski
Lexus LC500 Convertible Auction: A Preview of Rising Values?
Brett Foote
GX 550 vs TX 550: Best 3-Row Luxury Lexus Family Hauler
Michael S. Palmer
9 Best Lexus Models You Can Buy for Half Price (And 1 You Shouldn't!)
Joe Kucinski
2026 Lexus NX Buyer's Guide: Models, Features, Prices & More!
Brett Foote
Pole Position
Joined: Aug 2015
Posts: 299
Likes: 31
From: NJ
Both pre-cat O2 sensors should be replaced by now based on mileage as well as the engine temp sensor. Pre-detonation / and or pinging is more common with carbon issues. All 3 of these sensors can be sending bad readings to the ECU without a CEL. As others mentioned, double check for for vacuum and exhaust leaks.
Last edited by Lexuslsguy; Aug 13, 2017 at 08:38 AM.
Thread Starter
Pole Position
Joined: Nov 2001
Posts: 318
Likes: 0
From: Hamburg, Germany
Hi,
the car already went to the dealer twice!
First thought temp sensor,
second thought MAF
Both were not solving the problem.
How could the cats be clogged when the visual inspection looks fine and the car runs perfect in between?
Thinking about deleting the back cats.
Dealer was reading the o2 sensors they work perfectly.
Christian
the car already went to the dealer twice!
First thought temp sensor,
second thought MAF
Both were not solving the problem.
How could the cats be clogged when the visual inspection looks fine and the car runs perfect in between?
Thinking about deleting the back cats.
Dealer was reading the o2 sensors they work perfectly.
Christian
