2003 5.4 Engine Stutter While Turning
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Mountain Pass
Joined: May 2004
Posts: 201
Likes: 1
From: El Paso, TX
2003 5.4 Engine Stutter While Turning
My 2003 f150 5.4l has developed a slight stutter when I turn from a stop or go from reverse to drive or vise versa. I had thought it was the IAC so I replaced it but the issue is still there. There are no engine codes and it does not miss fire at idle or while driving. The problem appears to be happening only when the a/c is on. Could the belt be the cause? Has anyone ever experienced this before? Thanks in advance!
Cross-Country
Joined: May 2015
Posts: 83
Likes: 2
From: Atlanta
Fleet Mechanic
Joined: Aug 2008
Posts: 1,446
Likes: 9
From: NE Iowa JD Country
DO you have your foot on the brake when changing directions? F to R, and R to F? It maybe that you have a slight vacuum leak. Vacuum line to the brake booster , was it changed or checked too?
Doubt that bad belt would cause a hesitation, as you put it stutter...more likely a bad bearing if its lugging it down. Try this....with the engine off, slip the Serpentine bet off. Then spin the individual belt driven components listening and feeling for drag and roughness. With key on and engine off, turn the A/C on and off as well, testing how free the A/C compressor turns for each. Yes with it on it should turn stiffer but not ragged or rough.
Another thing to check is that the heater hoses are not leaking on the rearward most spark plugs.
Last edited by enriched&beyound; Oct 9, 2015 at 06:19 AM. Reason: more info
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jfowler1
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