Having problems with your 2006 Ford Expedition ?

Stumble after take off in engine of 01 expedition. No codes are coming up when hooked up to computer. All spark plugs were just changed.

Posted / edited by AnonymousUser on : 22-10-2018

Answers :

Sounds like Mass Air Flow Sensor(MAF). While vehicle is running tap it lightly with a screw driver and see if there is a change in idle. Next inspect the air duct attached to it must be free of holes and cracks. The other thing you can do to see if its working properly is to restrict the flow of air going into it and measure the pulse width of a fuel injector to see if there was a change in fuel delivery. if there is a change its working.
Look at the old plugs for burn condition. This will show you if there are strange colors on the plugs from contaminated fuel. Do a fuel sample and change the fuel filter at the same time. Were the new plugs gapped properly? An osilliscope type of meter will show each plugs firing peak.
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\015\012Use a water spray around the intake manifold to check for vacuum leaks and a vacuum gauge to see how much vacuum you are creating. If still no help, temporarily plug the EGR vacuum line. It will code, but check performance with it disconnected.
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\015\012Most other electronics should code, you might have a weak spot on the TPS. It advances spark and fuel
\015\012flow and can cause stumble. Since it is a variable switch it may be bad and not code because of the wide range of opearation. They usually have to be shorted to code.
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Repair Help & Product Troubleshooting for 2006 Ford Expedition

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