rough idle and throwing codes! Help!
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Joined: Jan 2012
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From: Spokane, Washington
rough idle and throwing codes! Help!
I have a 2000 V10, 170,000 miles. It all started with a slightly surging idle, I checked and it was throwing codes 03-p1000, 02-p0171, and 01-p0174. I cleaned the MAF sensor, seemed to run good for a couple days and then got worse. Decided to replace it, somehow runs even worse? Surges during idle, dies eventually, idles fine for a moment on startup then goes down to 500 and surges. Seems to drive fine, but I do notice now when I let off the gas it drops down to 500 rpm. I replace the fuel filter recently, plugs about 10,000 miles ago. I don't notice a power loss really, just can tell its not running right. Anyone have any ideas? PCV is going to be my next check. I really don't want to have to take this to the dealer! Thanks, any help is appreciated!
Elder User
Joined: Feb 2006
Posts: 545
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From: FL
Reset your PCM codes as suggested (if you have not done so already during MAF sensor cleaning ) unplug your battery (-) pole few minutes . Did you re-install MAF sensor plug tightly back into air filter housing ? MAF sensor electrical plug installed correctly ?
You can purchase a fuel gage (+ fittings ?) for schrader valve onthe fuel rail and check the fuel pressure ( both ignition on engine not running and idle fuel pressures - I am guessing - the pressures should be in the neigborhood of 35-45 psi ) .
Also check all your vacuum hoses for leak ( including the PCV valve hoses-both sides of the head and elbow on throttle)
Good luck,
You can purchase a fuel gage (+ fittings ?) for schrader valve onthe fuel rail and check the fuel pressure ( both ignition on engine not running and idle fuel pressures - I am guessing - the pressures should be in the neigborhood of 35-45 psi ) .
Also check all your vacuum hoses for leak ( including the PCV valve hoses-both sides of the head and elbow on throttle)
Good luck,
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New User
Joined: Jan 2012
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From: Spokane, Washington
Got it figured out, the PCV hose was split in two places under the throttle body where it goes into the intake manifold. I replaced the hose and PCV valve. Man what a difference that makes! I've had declining fuel mileage and power over the last year, just thought the truck was getting old! Power is back and running about 500 less RPM's so I should see my mileage return. Read some articles about tranny shifting and the PCV affecting it, I can say that is very true,no slipping and drives like a new truck again! Thanks for the ideas, the vaccume leak idea got me thinking. Looking at the old hose going into the intake it looks like a pretty generic rubber that deteriates easily and the old PCV rattled, but definatly didn't seal up and work as it should. Thanks again!
Senior User
Joined: Apr 2009
Posts: 194
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From: South Carolina
How did you connect to the throttle body?
Heated PCV valve connections
<HR style="BACKGROUND-COLOR: #d1d1e1; COLOR: #d1d1e1" SIZE=1 itxtNodeId="1691"><!-- / icon and title --><!-- message -->My 2000 Excursion V10 has exactly this set up. There are two hoses for heating the PCV valve and one vacuum connection from the PCV valve to the throttle body.
Does anyone know how to remove the throttle body vacuum hose? Is it just pressed in? I am looking to replace the PCV valve and the three hoses, however, I am not certain of the vacuum connection to the throttle body. In my EX the hose to the throttle body is a straight hose with no L connection. It enters a metal pipe like connector about the diameter of a quarter. Looks like it might plug over a nipple within the connector.
If I don't get any feedback I will cut off the old hose at the throttle body and get some stiff 3/8" hose to replace it from the throttle body to the heated PCV valve.
Any thoughts!
<!-- / message -->
<HR style="BACKGROUND-COLOR: #d1d1e1; COLOR: #d1d1e1" SIZE=1 itxtNodeId="1691"><!-- / icon and title --><!-- message -->My 2000 Excursion V10 has exactly this set up. There are two hoses for heating the PCV valve and one vacuum connection from the PCV valve to the throttle body.
Does anyone know how to remove the throttle body vacuum hose? Is it just pressed in? I am looking to replace the PCV valve and the three hoses, however, I am not certain of the vacuum connection to the throttle body. In my EX the hose to the throttle body is a straight hose with no L connection. It enters a metal pipe like connector about the diameter of a quarter. Looks like it might plug over a nipple within the connector.
If I don't get any feedback I will cut off the old hose at the throttle body and get some stiff 3/8" hose to replace it from the throttle body to the heated PCV valve.
Any thoughts!
<!-- / message -->
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Senior User
Joined: Apr 2009
Posts: 194
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From: South Carolina
Cut it off and plugged in new hose
Ok...I just vertically cut the hose to throttle body and pulled it off. The replacement just pushes on over the lip of the male tube. Hope this improves my vaccum and maybe eliminates my random crank but no fire problem.
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