Lexus'05 Phase 3 GS300 - Valves coked up? Diagnose & remedy?
Discussion
I thought perhaps I'd have a punt on the more specialist board before I open it up the wider forums...
I have a 2005 (phase 3 Soap bar shape) Lexus GS300 which I believe has direct injection. Currently at 115,000 miles.
After a frankly incredible run of reliability, it's started to use a little oil (~150ml/1,000 miles but TBC). It's also started noisey tapping from cold, this goes away once it's warmed up. On rare occasions it was a bit rough at idle, I'm unsure whether this is simply slightly low oil. I'm currently monitoring to see if it's using coolant.
Is there a way to diagnose coked up valves without removing the heads?
Is there a cost effective way to remedy this? The car is worth about £2,000, and I have little time to repair it myself.
I am keeping an eye out for HGF, and timing chains/tensioners. But all of these problems effectively write off the vehicle sadly.
Advice appreciated thanks.
I have a 2005 (phase 3 Soap bar shape) Lexus GS300 which I believe has direct injection. Currently at 115,000 miles.
After a frankly incredible run of reliability, it's started to use a little oil (~150ml/1,000 miles but TBC). It's also started noisey tapping from cold, this goes away once it's warmed up. On rare occasions it was a bit rough at idle, I'm unsure whether this is simply slightly low oil. I'm currently monitoring to see if it's using coolant.
Is there a way to diagnose coked up valves without removing the heads?
Is there a cost effective way to remedy this? The car is worth about £2,000, and I have little time to repair it myself.
I am keeping an eye out for HGF, and timing chains/tensioners. But all of these problems effectively write off the vehicle sadly.
Advice appreciated thanks.
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