Why does my vehicle RPM go up and down during cold start ups? And then the RPM level goes back to normal setting.
Feb 28, 2008 at 9:11 AM
1990 Ford Bronco RPM Flucuation during cold start
BLAZER99
- MEMBER
- 2 POSTS
several things could cause this. i would start by cleaning throttle body and idle air control valve. possible faulty coolant temp sensor.
Feb 28, 2008 at 9:14 AM
I had the same problem and i spent 4 months with it, after replacing a couple parts that werent it, it ended up being the M.A.P. sensor in the end once i put the new map sensor the problem went away completely
Mar 2, 2008 at 11:08 PM
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