IAC valve?
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New User
Joined: Oct 2004
Posts: 16
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From: Malvern AR
IAC valve?
I changed the IAC valve today because of hard starts. Before, it would start and die start and die. I could give it a little gas and it would run to get going, or peck a little on the IAC valve to temporarily fix it. No codes would come up. Now after I changed the IAC it runs High and low and comes up with a P1506 code. Un known powertrain DTC (manufacturer controlled: vehicle speed... The rest of the details are cut off of my scanner tool. Any ideas?
Thread Starter
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New User
Joined: Oct 2004
Posts: 16
Likes: 0
From: Malvern AR
Yes, after I did this it codes P0171 and P0174. System too lean on bank 1 and 2. Now I am really lost. It still idles high and low from 400 to 1500 rpms in park and dies to trying to runaway in drive. any help?
Senior User
Joined: Aug 2004
Posts: 304
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From: Connecticut
P0171 and P0174 have been posted here as a common problem about PCV elbow that leaks. The said elbow is about the same area where the IAC valve is, so it's possible you have a rotting elbow and you somehow 'touched' it while working on IAC valve and made any impending leak/hole worse.
Search the board for PCV elbow or P0171 and P0174, there should be a lot of information you can use.
Personally never had this problem, and in fact, tried hard to find this elbow and couldn't find it, mine seems to have a straight reducing rubber connector and not an elbow in the general area described above.
Good luck.
Search the board for PCV elbow or P0171 and P0174, there should be a lot of information you can use.
Personally never had this problem, and in fact, tried hard to find this elbow and couldn't find it, mine seems to have a straight reducing rubber connector and not an elbow in the general area described above.
Good luck.
