Lexus IS Forum banner

1 - 3 of 3 Posts

·
Premium Member
Joined
·
10,234 Posts
Discussion Starter #1
About 3 months ago, I noticed that while cruising at approximate 75-80 mph I noticed my RPM is at about 3100 RPM, which I believe is a problem because it use to be lower. I then decided to do a compression test on all cylinder, 1 to 5 didn't have much variances but #6 was very low and had a big difference compared to all the other cylinders (approx 50% diff). Currently I am losing coolant about a 1/2 pint every month or so, I am unsure about oil consumption.

At the moment I am thinking it's a headgasket but does anyone know what other possible problems?

The motor has 122k on it.
 

·
Premium Member
Joined
·
10,234 Posts
Discussion Starter #3
I hope this is the case. Sometime this week I will get a chance to do a leakdown test. If it is just a headgasket, it should be a simple fix. This issue is holding me back from boosting.
 
1 - 3 of 3 Posts
Top