1998 Ford Expedition Noise from engine area

WLDANGL79

MEMBER
1998 FORD EXPEDITION
V8
2WD
AUTOMATIC
226,834 MILES

My expedition is making a popping sound from the engine area. It only makes the sound when it is first started. The best description of the sound is a back-fire. I have been told to change the plugs, but wanted another opinion first.

Monday, July 5th, 2010 AT 1:01 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Has the check engine light come on?

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Tuesday, July 6th, 2010 AT 4:11 PM

WLDANGL79

MEMBER
2 POSTS

No, the check engine light isn't on.

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Tuesday, July 6th, 2010 AT 8:30 PM

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

If the plugs were bad and causing a misfire, the check engine light would have come on and told you what cylender is causing the problem. I need you to check for vacuum leaks on the engine, Remove the EGR and make sure it isn't carboned and it is working properly, and if all that is okay, we will need to check fuel pump pressure. I will provide directions when we get to that point.

Let me know what you find. PLEASE NOTE: The computer will identify a misfire. However, if it only lasts a few seconds, it will not set a code. If you haven't replaced the plugs in a long time, it won't hurt. It is just at this point, I don't think that is where the problem is coming from.

Joe

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Wednesday, July 7th, 2010 AT 10:41 PM