2000 F150 5.4 Automatic. Intermittent problem. Starts OK, then sometimes dies immediately. Runs OK for several days, then starts with lousy idle. No hard codes set, took it to a tuning place and they said that it needed the MAF sensor replaced. So I let them. 2 days later, same problem, still no codes set. Finally after 3 weeks of this intermittent idling, it sets a code-P1507 which I believe indicates an problem with the Idle Speed Control sensor. I am suspicious of their motives. They told me it set a P1510 and Advance Auto told me it is a P1507. P1510 I think is for a BMW and P1507 is for a Ford. Now they are telling me that they need to replace the MAF again. P0171 and P0174 I think are the codes for the MAF problems(but that was not what set). Is is possible that they have made a misdiagnosis and charged me $350.00 for a MAF when they s/b looking at the IAC?? Any thoughts or how to proceed? I thought about just letting them go ahead and replace the MAF again and see if they do any other work(like on the IAC) at the same time.
Jim

 

0171 and 0174 are lean codes. Not sure on the exact cause of them. The IAC would have been the first place I checked. The MAF probably could have been cleaned not replaced, unless it was truely faulty. I'd take it back and tell them that the MAF was not the fix, so they should fix it correctly at no charge, since they were sure it was the MAF. Or change out/clean the IAC on your own. Really not that difficult. I posted a couple of pics of when I did the IAC on my 2000. For what it is worth though, I still have intermittent idle issues. I'm still trying to track down the problem.

 

Can you tell me where the pics are you posted so I can find my IAC. I am having trouble finding it on my truck as their is so much crammed under the hood. Looks like its back behind the under the top of the firewall. thanks for the reply.

 

All you have to do is use the search bar -

Lean codes - Ford checks these in order.

MAF - Usually just dirty

PCV - Leak

Intake gaskets.


That's what Ford checks according to Oasis.

This gets posted twice a day, search it out.. - Here the most common is the PCV leak back by the firewall - 90 degree elbow.

It's not easy detecting this leak because that elbow develops PIN HOLES - I mean very small ones, look for the red dot in the pic -

 

IAC Thread

Here you go...

 

Great PICS! Exactly where I was assuming it was but none of the other pics I had showed it there, but it does look like the part. You said you like to clean the throttle body also. Being lazy , is that the part the IAC is connected to and if so, is it fairly easy to clean too?? Thanks a bunch for the pics, now I'm ready to go to work on that thing or at least I'll know if they mess with it when I go back to have them fix the problem at no charge!!
Jim

 

You lube up the IAC's mechanicals with WD40 and work them back and forth with a screwdriver or small pair needle nose pliers.

Keep in mind , that isn't the reason for your lean codes..Seperate issue I explained above.

 

Here you go


Follow jbrews advice regarding the problems, this is only for the TB

 

Thanks a bunch. We'll see how it goes. It's a pretty clean truck to have 83M miles on it, but that's just on the outside!! You've been very helpful. Merry Christmas!!!!!!!!
Jim

 

OK, here's the update and I would like some opinions on this. The place that did the original repair work said to come back in and they would replace the MAF sensor(this is after they told me it had a code of P1510, which I believe is for a faulty IAS on a BMW, it really read P1507, so they knew they were wrong, and still told me that the code meant a faulty MAF). I went back in after marking the MAF and the IAS control valve. I watched them work and they never got near the MAF. Then a parts driver came in and delivered a part to my mechanic and he proceeded to go staight to the IASC valve. They gave it back to me without any paperwork and told me to my face that they replaced the MAF. I had taken pics of the before(dirty IACS valve), and when I got home, the same MAF was there and there was a brand new IASC valve on my truck. I took more pics and got a witness before and after. I called them and the manager(who is the one who handed the mechanic the new part) told me he would have to talk to the mechanic about it cause he didn't know anything about it. I told him I was going to give him the opportunity to do the right thing, which, in my opinion should be no charge as I do not think the MAF was bad to start off with-$350.00 for parts and labor. What do you think I should do??
Jim

 

What you are doing now is the right thing. Give them a chance to make it right. If they do not, then you escalate it. If you paid for a new MAF and they never got you a new one, and knowingly charged you for it, that's theft. Let them make it right, then find a much better and reputable shop. How much did the charge you for the IAC, out of curiousity?

 

They never charged me for the IAC, they just said that they had replaced the MAF and I drove away without any paperwork. They are trying to disguise their first move (of putting the MAF in initially) by replacing the IAC(which is what was defective to start off with). They had no idea that I was watching them and had marked all of the parts before I went in. I think they should give me a credit for the first work they did, which was installing the MAF and I agree to not pursue it any further with their corporate headquarters. I am really POed about them lying to me and telling me that they replaced the MAF and instead put in a new IAC. That just ain't right. They need to pay the piper for lying to me, but we will see if they own up to it or not. It was not my intention to have to go to these measures, but they could have just owned up to it and said they were wrong and would not charge me for the MAF and I would have paid for the IAC, although I really think I could have cleaned it or replaced it myself.