Will the IAC in a 99 throw a code?
Thread Starter
|
Tuned
Joined: Feb 2003
Posts: 392
Likes: 1
From: New Jersey
Truck would barely idle this morning on the way to work. Low 50s with rain and the trucks idle stayed at 400 RPM the whole 45 minute ride. I was actually surprised the truck did not stall and that the idle was steady.
Went to AutoZone at lunch time and of course the truck ran fine.
Pulled a P1507 code.
1. Engine vacuum leak
2. failed IAC valve
3. open or short electrical condition
4. air inlet plugged
I’ve ruled out 1 and 4 since I don’t believe this would happen intermittently. So as soon as the rain stops I’ll have to check the connections and pick up a new IAC valve.
Went to AutoZone at lunch time and of course the truck ran fine.
Pulled a P1507 code.
1. Engine vacuum leak
2. failed IAC valve
3. open or short electrical condition
4. air inlet plugged
I’ve ruled out 1 and 4 since I don’t believe this would happen intermittently. So as soon as the rain stops I’ll have to check the connections and pick up a new IAC valve.
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,242
Likes: 758
From: Houston, Texas
Sound like the IAC and maybe one of your vacuum hoses got disconnected or is loose.
I wouldn't waste money on a new IAC valve. My girl's truck was exhibiting the same symptoms a few weeks ago and it turned out to be a disconnected vaccum hose and an extremely dirty IAC valve.
When you get off of work tonight, stop by autozone and pick up a can of Berryman's B12 and a can of non-flammable electrical cleaner. Spray your IAC with some B12 until you don't see any black gunk coming out of it. Either that or you can soak it for a few hours with the fuel additive version and get at it with a toothbrush. Either way, follow it by spraying it with the electrical cleaner so you don't have any B12 on the IAC anywhere then let it airdry. Get up a little earlier, put it back on, and you should be good to go unless it's something else, although I doubt it....
I wouldn't waste money on a new IAC valve. My girl's truck was exhibiting the same symptoms a few weeks ago and it turned out to be a disconnected vaccum hose and an extremely dirty IAC valve.
When you get off of work tonight, stop by autozone and pick up a can of Berryman's B12 and a can of non-flammable electrical cleaner. Spray your IAC with some B12 until you don't see any black gunk coming out of it. Either that or you can soak it for a few hours with the fuel additive version and get at it with a toothbrush. Either way, follow it by spraying it with the electrical cleaner so you don't have any B12 on the IAC anywhere then let it airdry. Get up a little earlier, put it back on, and you should be good to go unless it's something else, although I doubt it....
Elder User
Joined: Jan 2008
Posts: 605
Likes: 1
You can monitor the IAC counts with a scan tool. You can do a snap throttle to see if the counts go up and down as they should. You can also monitor STFTs while spraying the rubber hoses looking for vacuum leaks(cracked hoses). When you hit a leak the STFTs will jump POS immediately.
Thread Starter
|
Tuned
Joined: Feb 2003
Posts: 392
Likes: 1
From: New Jersey
My truck was built in August of 1999 and it threw a P1507 code.
Cleaned the IAC real good with throttle body cleaner and it worked. The truck is still running good. 4/7/10
Cleaned the IAC real good with throttle body cleaner and it worked. The truck is still running good. 4/7/10
Last edited by Shernius; Apr 7, 2010 at 07:14 PM. Reason: Update
Thread
Thread Starter
Forum
Replies
Last Post
shad9876
6.4L Power Stroke Diesel
2
Jan 30, 2014 08:49 PM
damicofuel
1999 - 2003 7.3L Power Stroke Diesel
4
Dec 18, 2009 08:17 AM
