Low compression
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Driver School Candidate
Joined: Jul 2017
Posts: 2
Likes: 0
From: WA
Low compression
2001 Lexus RX300 with CEL and VSC light. OBDII Code P0302. 257k mi. Replaced plugs, coil pack and VVT solenoids and #2 fuel injector...no help. Runs great at road speeds but rough idle (with CEL and VSC). Also removed and cleaned IACV. Noid test good. Compression on cylinder #2 low 60 psi (dry). 150-160 psi on #4. My question is ...Can a bad Idle Air valve cause all this? Ran great right after cleaning the valve, but after 3 miles the lights came back on. Thanks
Intermediate
Joined: Feb 2014
Posts: 499
Likes: 71
From: FL
You could try something called Engine Restorer, which is supposed to increase cylinder compression. Not sure what you have to lose at this point with such low compression in a cylinder. Maybe someone else can weigh in on using it.
Lexmex, a longtime poster here, said he used it in his RX300 in this thread:
https://www.clublexus.com/forums/gs-...-restorer.html
the material
https://www.restoreusa.com/index.php
A real world example
Lexmex, a longtime poster here, said he used it in his RX300 in this thread:
https://www.clublexus.com/forums/gs-...-restorer.html
the material
https://www.restoreusa.com/index.php
A real world example
Intermediate
Joined: May 2016
Posts: 483
Likes: 84
From: Indiana
Sounds like a burnt exhaust valve. Try some sea foam thru the pcv hose to clean the valve seats. Top end cleaning. It may not be too late to have the valves re shimmed.
Last edited by Drcoffee; Aug 12, 2017 at 05:06 AM.
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