99 Navi running rough
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5th Wheeling
Joined: Aug 2013
Posts: 28
Likes: 0
From: Sanford, Fl
99 Navi running rough
Starts fine but when sitting at a light it drops from normal 750 rpm to 500 rpm and feels like there is a big cam in it. Don't notice any smoke or anything. SES light is on, just don't want to get hosed at mechanics....any suggestions? Thx
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
Lots of posts here on replacing plugs or coil paks or the coil pak boots.
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5th Wheeling
Joined: Aug 2013
Posts: 28
Likes: 0
From: Sanford, Fl
Codes
P0171.
P0174.
Which means bad or dirty MAF....should have known this. 2 of my sons have rangers and every time they hiccup we clean the MAF and problem goes away. I cleaned the one on the Navi and it did not work, I will double check tomorrow and if it doesn't clear......looks like I will be buying a new MAF.
P0174.
Which means bad or dirty MAF....should have known this. 2 of my sons have rangers and every time they hiccup we clean the MAF and problem goes away. I cleaned the one on the Navi and it did not work, I will double check tomorrow and if it doesn't clear......looks like I will be buying a new MAF.
Tuned
Joined: Mar 2011
Posts: 411
Likes: 7
From: Proctorsville VT
Could mean something other than MAF. Check for a vacuum leak before replacing.
PCV elbow first. If no problem there, then propane or smoke test.
PCV elbow first. If no problem there, then propane or smoke test.
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
X2 on the pcv elbow. If your 99 hasn't changed this yet, it's Big Time necessary.
Laughing Gas
Joined: Oct 2005
Posts: 1,226
Likes: 42
From: The OC
P0171.
P0174.
Which means bad or dirty MAF....should have known this. 2 of my sons have rangers and every time they hiccup we clean the MAF and problem goes away. I cleaned the one on the Navi and it did not work, I will double check tomorrow and if it doesn't clear......looks like I will be buying a new MAF.
P0174.
Which means bad or dirty MAF....should have known this. 2 of my sons have rangers and every time they hiccup we clean the MAF and problem goes away. I cleaned the one on the Navi and it did not work, I will double check tomorrow and if it doesn't clear......looks like I will be buying a new MAF.
Just Sayin
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5th Wheeling
Joined: Aug 2013
Posts: 28
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From: Sanford, Fl
Yes sir, I am grabbin a new PCV valve, grommet and 90 in the morning...can't hurt they have never been changed. Will keep you posted. Thx
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5th Wheeling
Joined: Aug 2013
Posts: 28
Likes: 0
From: Sanford, Fl
PCV Location
Uh, can someone tell me where it is located??? If I am looking at the engine from the front...left valve cover or right...keep in mind it is a 99 navi 32v intec, not a triton. Thx for the help
Tuned
Joined: Mar 2011
Posts: 411
Likes: 7
From: Proctorsville VT
You are not done looking for the vac leak. Search "propane test" for vacuum leak to learn how. Or you can also have a shop do a smoke test. This test positively identifies (or dismisses) a vacuum leak.
Absent a vac leak you can check out other DTC causes. How old is the fuel filter in this Expedition?
Absent a vac leak you can check out other DTC causes. How old is the fuel filter in this Expedition?
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5th Wheeling
Joined: Aug 2013
Posts: 28
Likes: 0
From: Sanford, Fl
Fuel filter is old, I crawled under to find it today before I went parts store. I have vertigo and went for a nice spin as soon as I was under there looking!! Gonna get my youngest son to take a look.at it for me...he is in his 3rd year if auto mechanics in high school...hope he can find it!!! Lol
You are not done looking for the vac leak. Search "propane test" for vacuum leak to learn how. Or you can also have a shop do a smoke test. This test positively identifies (or dismisses) a vacuum leak.
Absent a vac leak you can check out other DTC causes. How old is the fuel filter in this Expedition?
Absent a vac leak you can check out other DTC causes. How old is the fuel filter in this Expedition?
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
Just look at or about the drivers side seat location, under the the truck along the frame rail. Use a quick connect tool, 3/8" I believe to remove both fittings to replace.
Pretty easy to remove and replace.
Pretty easy to remove and replace.
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