Sign in to follow this  
clacey

Clean Valves And Lifters?

Recommended Posts

I just bought a 91 LS 400 with 213,000 mi. I just replaced the Starter, & PCV Valve. The engine makes a tapping noise when under acceleration. When I replaced the PCV Valve, I noticed that it seemed pretty sluggy in there. Would it help to remove the valve covers and clean the valves and lifters? If so what should I use? I know that in 97 the dealership ran some GM Top Engine Cleaner through it to remove a tapping sound. I wonder if I should try that again? Has anyone used this stuff on thiers? The three causes of this seem to be:

1. Sticky valves

2. Valve adjustment

3. Exhaust leak

4. Timing advanced

Do you have to reset the timing when you replace the timing belts?

I have a lot to do to this thing. Any input is appreciated.

Thanks,

CL

Share this post


Link to post
Share on other sites

WHy waste all that time ,just buy a bottle of engine flush and run it then replace the oil (and filter) with cheap stuff for a week then replace with synthetic to make sure all the flush is gone.

Share this post


Link to post
Share on other sites

They work amazing i have used tehm on my wifes sunfire my civic ,lexus and the list goes on.

I use the penzoil one they all are pretty much the same

The lifters getting unstuck makes the biggest power and noise difference.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this