Vacuum leak in 1998 Expedition
#1
03-26-2004, 02:37 AM
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Vacuum leak in 1998 Expedition
am serious need of some help. I have a 1998 Ford Expedition 5.4.
I am getting a check engine light with the code of PO171 & PO174.
I have already changed the PCV valve, fuel filter, spark plugs, and air filter.
I then cleared out the codes in hopes that my problem was fixed but within a very short time the check engine light turned back on.
The car still runs great. The only problem is that when I am in idle speeds (stop light, stop sign) the car trembles alot and acts like it wants to turn off.
I am not sure what to do next.
Any help is greatly appreciated
I am getting a check engine light with the code of PO171 & PO174.
I have already changed the PCV valve, fuel filter, spark plugs, and air filter.
I then cleared out the codes in hopes that my problem was fixed but within a very short time the check engine light turned back on.
The car still runs great. The only problem is that when I am in idle speeds (stop light, stop sign) the car trembles alot and acts like it wants to turn off.
I am not sure what to do next.
Any help is greatly appreciated
#2
03-26-2004, 06:13 AM
Follow PCV tube to rear of engine and you will find a vacuum elbow to intake, right behind throttle body near firewall. go to dealer and get the whole pcv,tube, and elbow assy. Note there are two different tube assy's. One is a straight shot PCV to Intake.
The other has a y (fork) near pcv valve. These rubber connections always deteriorate and leak.
The other has a y (fork) near pcv valve. These rubber connections always deteriorate and leak.
#3
03-26-2004, 09:48 AM
Had the same issue with my '98 before I traded it in...it was what Troll45 mentions above.
Try this link...has all the info (see response on second page which has links for how-to)
https://www.ford-trucks.com/forums/s...t=check+engine
Try this link...has all the info (see response on second page which has links for how-to)
https://www.ford-trucks.com/forums/s...t=check+engine
#4
03-28-2004, 10:39 AM
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Update to previous problem
Hi guys I hope you can help. This is an update to my previous problem.
Before I started doing anything I figured why not go back to Autozone to verify the codes. LOw and behold I was shocked when they came back saying I have 6 codes.
PO171 - Fuel system for Bank 1 too lean
PO174 - Fuel system for Bank 2 too lean
PO136 - Electrical circuit for Oxygen sensor 2 in bank 1
PO156 - Electrical circuit for Oxygen sensor 2 in bank 2
P1151 - Lack of HO2S21 switch, sensor indicates lean
P1131 - Lack of HO2S switch, sensor indicates lean
Any help on what I should do is greatly appreciated. As I stated earlier the car in running great. It is only when I am at a stop sign or stop light where I notice the rough idle.
I have only changed the fuel filter, air filter, spark plugs, PCV valve and I have staring using supreme gas with a fuel injection cleaner additive.
Thank you in advance
Before I started doing anything I figured why not go back to Autozone to verify the codes. LOw and behold I was shocked when they came back saying I have 6 codes.
PO171 - Fuel system for Bank 1 too lean
PO174 - Fuel system for Bank 2 too lean
PO136 - Electrical circuit for Oxygen sensor 2 in bank 1
PO156 - Electrical circuit for Oxygen sensor 2 in bank 2
P1151 - Lack of HO2S21 switch, sensor indicates lean
P1131 - Lack of HO2S switch, sensor indicates lean
Any help on what I should do is greatly appreciated. As I stated earlier the car in running great. It is only when I am at a stop sign or stop light where I notice the rough idle.
I have only changed the fuel filter, air filter, spark plugs, PCV valve and I have staring using supreme gas with a fuel injection cleaner additive.
Thank you in advance
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