1998 expedition help!!
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1998 expedition help!!
my 98 5.4l has been acting up lately
first set a p0171 and p0174 code hesitating and missing bad
found the pcv hose vaccum leak now that code is gone (cleared the computer and it never came back)
then have a p0102 (maf sensor/low circuit output) put on a new maf sensor and it still studders and stumbles
it also studders around 50-60 mph
there is a funny knocking noise coming fro mthe top of the motor
could the egr valve be causing my miss and funny knocking noise?
any help is appreciated
thanks
nate
first set a p0171 and p0174 code hesitating and missing bad
found the pcv hose vaccum leak now that code is gone (cleared the computer and it never came back)
then have a p0102 (maf sensor/low circuit output) put on a new maf sensor and it still studders and stumbles
it also studders around 50-60 mph
there is a funny knocking noise coming fro mthe top of the motor
could the egr valve be causing my miss and funny knocking noise?
any help is appreciated
thanks
nate
Fleet Owner
Joined: Apr 2008
Posts: 24,322
Likes: 5,132
From: 0,0,1
You first might want to take a look at the cam sensor as the problem. It's driven off the cam and controls injector timing. If it's cracked or broken this could explain the sound you're hearing and it will also make the engine stumble.
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where is the cam sensor located?
would it cause the knocking,pinging sound that im hearing.........after i shut the truck off the egr makes a funny noise and i tapped it a couple times and the sound changed everytime i hit it
thanks
nate
would it cause the knocking,pinging sound that im hearing.........after i shut the truck off the egr makes a funny noise and i tapped it a couple times and the sound changed everytime i hit it
thanks
nate
Fleet Owner
Joined: Apr 2008
Posts: 24,322
Likes: 5,132
From: 0,0,1
Yes, if the EGR is slightly open you will get a lean condition. A lean condition under heavy acceleration will cause pinging, misfires, and lack of power.
