Engine: 2.5-liter I-5
Mileage: 93,000 +
Problem:
When I start my engine after a few hours of inactivity (or after a night of rest), my RPM jumps up to 1400 upon starting. After a minute, it will drop back down to 800. This occurs even in Texas summer condition. If I engage gears before the RPM drops down to 800, the car will lunge in the direction. (i.e. D = lunge forward, R = lunge backward).
I have regularly changed my engine oil, just got my transmission fluid changed, air filter and cabin filter changed (all of these are for preventative maintenance).
Is this cause for concern? And if I wanted, what are some fixes I can consider?
Thanks!
try my video make your car run better with a little spray cleaner and pray that helps and it's not some kind of electronic failure in the warm-up system.
Update:
I went to watch your video on how to do some maintenance with a spray cleaner [www.youtube.com/watch?v=NWCKvU2FmDc]! And i really enjoyed it. I also went to perform those activities following the instructions you gave! It was really satisfying although.. some parts were quite hard to remove on a VW. Thank you so much for your guidance and I really appreciate it.
Just wanted to share some stuff in case anyone ever stumbles onto this post. On a 2.5-liter I-5 engine, the Mass Air-Flow (MAF) is called Manifold Absolute Pressure (MAP) sensor. The same CRC MAF sensor cleaner can be used to clean the MAP sensor too [www.youtube.com/watch?v=o0P5MwJ6kWQ]. If you are going to clean your MAP sensor, most of the time, you should also go and clean your throttle intake!
Point of Clarification:
@scottykilmer How do i check if it is not some kind of electronic failure in the warm-up system?
Also, it would seem that this high initial rpm on a cold-start on a 2.5L inline engine is common [ https://forums.vwvortex.com/showthread.php?5481339-Cold-starting-where-did-my-initial-high-rpm-idle-go ], can I check with you on your professional opinion? Or if this is fake news?
Thanks!