05 Expedition cleaned throttle body now will not stay running

[Jb14]

(FIXED) 05 Expedition cleaned throttle body now will not stay running

Hi folks, I have an 05 Expedition 5.4. cleaned my throttle body with throttle body cleaner. Now the engine will not stay running. I reset the computer a few times by disconnecting battery. Checked hoses for leaks (non found) when I unplug the MAF the engine will idle no problem then when plugged back in engine stalls. I replaced MAF and still same effect. Wondering if it could be the throttle body motor. Also checked all fusses and good. Any help is greatly appreciated.

 

[01yellerCobra]

Since it idles with the MAF disconnected I'm thinking everything is ok with the throttle body. Did you remove it to clean it? If so double check the gasket. Also double check your couplers. It's easy to miss part of the throttle body lip and cause a vacuum leak.

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[Jb14]

Thanks for the reply. No I did not take it off to clean. I've taken the aircleaner housing off three times since and rechecked everything associated to it to make sure everything is seated properly, and still the same.

 

[Whack]

Did you remove the Idle Air Control valve as part of your cleaning?

 

[Jb14]

No I did not

 

[Whack]

Sorry, 2005s don't have an IAC.

How much did you remove to clean it? Did you unplug both electrical leads on the TB?

Was the TB removed from the intake manifold?

Do you have any Check Engine lights or Message Center display?

 

[ZombieSoldier]

how did you clean it?

 

[Jb14]

Ive taken it to a mechanic and even though I replaced the MAF (which I returned) he replaced the MAF and got it to stay running but not when I start it up it runs perfect for literally 10 seconds then it cuts out and the message centers states check electronic throttle control. So now I do not know if I have to replace my throttle body or the throttle control on the side.

When I cleaned I did not disconnect TPS or control motor.

Thanks

 

[buildingdoc]

Same problem here. I had p0171 and p0174 codes. After everything you checked as well I found bank 2 cats were clogged sending exhaust back to the engine and forcing it to stall. I was getting atrocious fuel mileage as well. If temp drops across the cats as it's running and up to temp, it maybe the problem.

 

[Jb14]

Thats interesting I will check that out the odd thing is that it was running well and I just clean the throttle body and now just not the same truck

 

[toms89]

I will 2nd ZombieSoldiers question.

How exactly did you clean it?

Understand you used throttle body cleaner and.....


The process you took may help diagnose.


The stuff I am familiar with you either removed it and cleaned it or you made sure it was running, higher rpm so as not to stall it and burned the cleaner off. I have not used the stuff in many years so maybe the procedure has changed? The 2nd way can be a bit trickier with mass air. If you spray in a vacuum port it will do nothing for the throttle body so I assume you would have had to find a port between the throttle and the mass air sensor?!

 

[Whack]

Check 'Electronic Throttle Control' message is the PCM indicating the Thottle Position Sensor or Throttle Position Motor is jacked. This is a how the Expy will indicate a serious issue with throttle control.

I would lean heavily on the motor... which Ford calls the 'Electronic Throttle Actuator'

The only time the PCM will kill the engine is if it doesn't register control with the 'ETA' correctly.

My guess is with the MAF sensor disconnected, the engine will wait until it can test with other things to see what is happening... With the MAF in place, it can tell the throttle is jacked and kills the engine.

I would check the connector on the driver side of the throttle body... If there is a short or contamination the whole system can get messed up. I don't have easy access to a test procedure, but pulling it off and looking for damage may help.

 

[Jb14]

PROBLEM FIXED

I want to thank everyone for your replies. I here to say I got the issue resolved . I will state what happened so that hopefully this may help others not go through the pain and expense I did.

I had two issues the throttle body and and a broken wire that connected to the MAF.

So what happened when cleaning the throttle body I took off the airbox which included unplugging the connector to the MAF which loosed what ever was left of the wire touching that was in the wiring harness leading to the MAF. After the wire was fixed the truck ran worse, because the MAF was now working properly. So the throttle body was the next culprit which was replaced. With 124k the truck runs like brand new. No more rough idle and my milelage is is back to normal. So thats it.

Had I not been so frustrated I could have replace the throttle body myself but I can honestly say I would not have figure out the wire issue. The first machanic could not fix the issue.

So a special thanks to Kenny with the truck shop in Temecula CA. With 18 years as a Ford Mechanic and 7 years with his own shop he knows his stuff.

Good luck folks

 

[Stoned06]

A possibility of why the throttle body had to be replaced is the fact that the TPS is built into it. When that goes bad, the whole TB has to be swapped out. Glad you got it fixed.

 

[Jb14]

I very thankful to having it running well, actually runs better than when new.. The big mystery though was the broken wire in the MAF wiring harness.

 

[Whack]

The best ending:

The Expy runs well!!!

Glad to hear!