Originally Posted by Virtus_Probi
Originally Posted by Trav
The Cadillac N* was famous for this racket at cold start but it was not piston slap in most cases it was carbon buildup. It may be slap but its worth trying to rid the engine of excess carbon.
Get two bottles of top engine cleaner for a V8, one of these will do.
https://www.amazon.com/Genuine-Toyo...mp;psc=1&refRID=8RB4AR1YNC005NEMNM9D
https://www.amazon.com/Subaru-Genui...4&keywords=subaru+top+engine+cleaner
T into a vacuum source and manipulate the flow by kinking the hose with the engine running at 2K RPM, shut the engine off let it cool and remove the plugs. Spray this into each cylinder, soak it down good..
https://www.amazon.com/Genuine-Chrysler-Accessories-4318001AD-Combustion/dp/B00BV4D97K
Let it sit overnight then tighten the plugs and fire it up, warm it up and run it hard for a few min. The N* engines I did this way were quiet as a church mouse the next cold start and remained that way. If it is slap, forget it nothing with help it much.
Subaru sells a special tool for introducing their cleaners through a vacuum line if you care to track one down and shell out for it...took me a bit to find one, ended up ordering it from a dealer in Colorado (believe it was the Heuberger seen in Trav's link).
I have found it to be very handy for that kind of cleaning process...they actually sell two types of cleaner, the Carbon Clean and Top Engine Cleaner. The former has an overpowering bleach smell while the latter has a typical hydrocarbon stench.
Yes they sell one but a piece of thin rubber of PCV tubing does the job fine, just kink the tube as much or little as needed. Its sort of a solution to a problem that doesn't exist.
https://www.amazon.com/Genuine-Toyo...mp;psc=1&refRID=TN0SXJGZBG5D6F8ABX5H
Originally Posted by Trav
The Cadillac N* was famous for this racket at cold start but it was not piston slap in most cases it was carbon buildup. It may be slap but its worth trying to rid the engine of excess carbon.
Get two bottles of top engine cleaner for a V8, one of these will do.
https://www.amazon.com/Genuine-Toyo...mp;psc=1&refRID=8RB4AR1YNC005NEMNM9D
https://www.amazon.com/Subaru-Genui...4&keywords=subaru+top+engine+cleaner
T into a vacuum source and manipulate the flow by kinking the hose with the engine running at 2K RPM, shut the engine off let it cool and remove the plugs. Spray this into each cylinder, soak it down good..
https://www.amazon.com/Genuine-Chrysler-Accessories-4318001AD-Combustion/dp/B00BV4D97K
Let it sit overnight then tighten the plugs and fire it up, warm it up and run it hard for a few min. The N* engines I did this way were quiet as a church mouse the next cold start and remained that way. If it is slap, forget it nothing with help it much.
Subaru sells a special tool for introducing their cleaners through a vacuum line if you care to track one down and shell out for it...took me a bit to find one, ended up ordering it from a dealer in Colorado (believe it was the Heuberger seen in Trav's link).
I have found it to be very handy for that kind of cleaning process...they actually sell two types of cleaner, the Carbon Clean and Top Engine Cleaner. The former has an overpowering bleach smell while the latter has a typical hydrocarbon stench.
Yes they sell one but a piece of thin rubber of PCV tubing does the job fine, just kink the tube as much or little as needed. Its sort of a solution to a problem that doesn't exist.
https://www.amazon.com/Genuine-Toyo...mp;psc=1&refRID=TN0SXJGZBG5D6F8ABX5H
