Today I used the CRC intake valve cleaner for the first time. I have 28K miles and have had a rough idle and rough acceleration, so I decided to try an intake valve cleaner and bought the CRC product.
https://www.amazon.com/dp/ (commissions earned)
I followed the rather complicated instructions, warm the engine, introduce the spray into the engine after the MAF sensor, while a second person keeps the engine at 2000 RPM and spray in 30 second intervals. I assumed that meant to spray for 30 seconds and then wait for 30 seconds before spraying again, the instructions were not clear about how long to wait between sprays. When the can is empty raise the RPM to 3000 RPM, but not over 4000 rpm 3 times and then turn the engine off and connect the PCV hose. Again the instructions were unclear about this. Wait for 1 hour and then drive at expressway speeds for at least 10 minutes.
After an hour wait I drove to the expressway and when I accelerated to highway speeds, the engine stumbled and blew out a huge cloud of blue-white smoke, the flashing engine symbol light and the traction control light and the low tire pressure light all came on. The engine went into limp mode and I could barely go 40 MPH. I exited at the next off ramp and when I came up to a stop light the engine was idling so rough I thought that the engine would die, so I put it in neutral to rev it up to keep it running so I could drive home. Then the engine ran smooth and the flashing service engine light turned off! Since the car was running I got back on the expressway and drove back, but the low tire pressure light and the traction control light were both still lit. As I was driving I noticed that I was low on gas, so I stopped and filled up. When I started the car after getting gas all the warning lights were off! A bizarre experience for sure!
The car now runs very good, smooth idle and acceleration like when it was new! I don't know whether to recommend this product or not. The engine runs smooth, but what a way to get there!
https://www.amazon.com/dp/ (commissions earned)
I followed the rather complicated instructions, warm the engine, introduce the spray into the engine after the MAF sensor, while a second person keeps the engine at 2000 RPM and spray in 30 second intervals. I assumed that meant to spray for 30 seconds and then wait for 30 seconds before spraying again, the instructions were not clear about how long to wait between sprays. When the can is empty raise the RPM to 3000 RPM, but not over 4000 rpm 3 times and then turn the engine off and connect the PCV hose. Again the instructions were unclear about this. Wait for 1 hour and then drive at expressway speeds for at least 10 minutes.
After an hour wait I drove to the expressway and when I accelerated to highway speeds, the engine stumbled and blew out a huge cloud of blue-white smoke, the flashing engine symbol light and the traction control light and the low tire pressure light all came on. The engine went into limp mode and I could barely go 40 MPH. I exited at the next off ramp and when I came up to a stop light the engine was idling so rough I thought that the engine would die, so I put it in neutral to rev it up to keep it running so I could drive home. Then the engine ran smooth and the flashing service engine light turned off! Since the car was running I got back on the expressway and drove back, but the low tire pressure light and the traction control light were both still lit. As I was driving I noticed that I was low on gas, so I stopped and filled up. When I started the car after getting gas all the warning lights were off! A bizarre experience for sure!
The car now runs very good, smooth idle and acceleration like when it was new! I don't know whether to recommend this product or not. The engine runs smooth, but what a way to get there!