Stalling 2003 F-150, 4.6L - Engine Troubleshooting


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Stalling 2003 F-150, 4.6L

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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

michaelpy
New User

Jul 3, 2014, 8:10 AM

Post #1 of 4 (1611 views)

Stalling 2003 F-150, 4.6L

Hi and thanks.
2003 F-150, 4.6L W/95k miles. Had codes pulled at Advanced Auto Care, lean mixture on both banks. Nothing done recently to precipitate stalling issue in drive and stopped at lights. No power issues at open throttle or acceleration. Seems to occur after short warm up period. Disconnected vacuum lines at manifold locations individually, no change in rpm. Valve(?) in center rear of throttle body supply manifold to intake manifold, (which has a coolant line and and a right bank valve cover vacuum line attached), has an elbow drawing air and hisses from vacuum, when covered idle is smooth. Should that hole be there, and what do think the fix would be? Thank you for your support.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 3, 2014, 8:27 AM

Post #2 of 4 (1606 views)

Re: Stalling 2003 F-150, 4.6L

Check for cracked intake manifold which I think is plastic and somewhat common to leak coolant more than this but corners can crack and would be sealing vacuum as well. Might not see it but intake vacuum might be universally low or off in a way that confuses how it runs with wrong info to engine control computer? A maybe,

T

michaelpy
New User

Jul 3, 2014, 11:01 AM

Post #3 of 4 (1593 views)

Re: Stalling 2003 F-150, 4.6L

Found probablem, small hole on vacuum line at rear of maniflod. An elbow that is at the intake end of the PVC hose assembly where I heard the hiss.

(This post was edited by michaelpy on Jul 3, 2014, 11:03 AM)

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 3, 2014, 11:11 AM

Post #4 of 4 (1590 views)

Re: Stalling 2003 F-150, 4.6L

Glad you found it. If like ones I've found there are more and another type large Ford truck all of the elbows were lousy at about the same age so check any others. Closed as solved and can re-open by any moderator upon your request,

T

(This post was edited by Tom Greenleaf on Jul 3, 2014, 11:12 AM)

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