I Have a 1999 Chevy suburban which I just put a reman engine in.
the truck starts real good and idels smooth but I keek getting the lean engine codes, and it runs bad when under a load.
I have replaced all the sensors but still the same codes.
Also have put in new fuel Injectors, spark plugs, wires.
still runs the same. can any one help me with this?
You have a vacuum leak. Did you use new intake manifold gaskets and torque the bolts according to the spec? Did you get all of the vacuum lines back on in the right places?
SOURCE: Hesitation and stumbling.
Before you do that, check which thermostat it has in it, if it has one that is letting it get too warm or not completely up to temp when the computer think it should be, it would cause this. My 2000 crown vic did the same thing and thats what it was.
SOURCE: 2001 Ford F150 V6, Truck started spitting and
i know that the 5.4l are known too misfire if you wash them because the water runs down between the coil and the heads. pull all your coilpacks and check for rust on the spring in the boot and use compressed air to blow any exessive mosture out of the coil to plug area.
SOURCE: Have a 2003 Taurus, 3.0 engine that has a misfire
Sound like an air / vacuum leak to me.
Re-check for an air leak on #2 cylinder inlet manifold.
Use a propane torch (unlit, of course) to flood propane gas around inlet manifold/head flange & gasket area.
If there is any change in idle speed during this test you have a vacuum leak.
SOURCE: Ford 150 runs rough when cold
Hi! Either the elbow at back of intake manifold is leaking or your intake gaskets are leaking. A very common occurance on both items and either one will set a lean code and illuminate the check engine light. Hope this info helps!
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What engine?
these are invalid codes
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