996.2 F.C. P0491 P0492
10-05-2018, 12:46 PM
#1
Rennlist Member
Thread Starter
996.2 F.C. P0491 P0492
OK, the only time I get these two Faults is after driving to full operating temperature and having to stop at a red light and idling more than a minute and half, both F.C activate, engine stay's running smooth, I reset the F.C. and nothing again till the same thing happens again, never comes on unless at idle for period of time at full temp. any idea's
10-14-2018, 02:01 AM
#4
Rennlist Member
Thread Starter
Thanx Guy's, finally got to work on the car, for the fault codes I started on doing a vacuum test and found a leak from the Changeover valve 1 line going to the Vacuum reservoir. PIA to get too, but done and no other leaks.
12-24-2018, 11:33 AM
#6
Rennlist Member
Damn it, now it's my turn to trouble shoot this.
01-16-2019, 04:11 PM
#7
Rennlist Member
I just posted on this problem with an earlier thread, now I find a newer thread. 808Bill, will follow your success with great interest.
So, while this is a PITA to have to watch the CEL and clear codes, is there a risk of damage to the engine by delaying fixing this? I just need to know where to prioritize against other projects.
So, while this is a PITA to have to watch the CEL and clear codes, is there a risk of damage to the engine by delaying fixing this? I just need to know where to prioritize against other projects.
Trending Topics
01-16-2019, 05:04 PM
#8
Rennlist Member
I have not had to code pop up since I cleared it but I'm ready to tackle it next time it pops up.
01-20-2019, 01:47 PM
#9
Rennlist Member
Found a vacuum line that was pulled out of a fitting, reconnected it and drove it yesterday without any CEL. It was the line that runs in front of the alternator between the changeover valve #1 and the one-way check valve Bought new hose and "y" and elbow fittings to replace with new. Hopefully no leaks further back and i can avoid pulling the alternator/throttle body. Sounds like a good preventative for a later day.
01-20-2019, 01:49 PM
#10
Rennlist Member
Found a vacuum line that was pulled out of a fitting, reconnected it and drove it yesterday without any CEL. It was the line that runs in front of the alternator between the changeover valve #1 and the one-way check valve Bought new hose and "y" and elbow fittings to replace with new. Hopefully no leaks further back and i can avoid pulling the alternator/throttle body. Sounds like a good preventative for a later day.