Ranger Noise Problem
I will include in this post what the Auto Shop stated to me yesterday.
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mso-style-priority
9; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} </style> <![endif]--> We meaning Mathewson’s and I are stumped by a problem we are having with the truck and wanted to tell ask about it in case someone has run into it before. This is the message I received from Mathewsons Automotive in Renton WA.TROUBLESHOOT NOISE,TEST DROVE REPEATEDLY And CHECK , FOUND THAT AT IDLE WHEN ENGINE IS UNDER LOAD FROM AC COMPRESSOR THAT THE IDLE AIR CONTROL MOTOR ACTION MAKE'S A BONGO DRUM TONE THRU AIR INTAKE , AT TIMES THE CONTROL TRIE'S TO COMPENSATE FOR CHANGE IN IDLE CAUSING A MORE RAPID SUCCESSION OF BONGO DRUM TONE'S. Dave at explorer express may of heard of this problem before. I can be annoying though it it will not hamper performance. Has anyone run into a problem like this?
The truck on the dyno shows 368 HP 313 Torque, AFR Avg: 12.1. Came with the new 3015 SCT Programmer, New fuel Injectors 39lb cobra, changed original gears from 3.55 to 4.10. can't think what else. If only the noise wasn't their it would be perfect.
with the AC on the IAC motor will adjust the idle , is there any carbon build up in there ?
is there any thing loose on the AC compressor , bolts brackets ?
could the IAC motor be bad ?
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http://www.explorer4x4.com/iac.htm
Let us know how you make out.
Last edited by michigan66; Nov 12, 2011 at 07:15 PM. Reason: Added info
Ford Trucks for Ford Truck Enthusiasts
I will try taking it apart and due the cleaning that was suggested by another member.
I only have 10K miles on the truck, and it runs great. Took it to the track here in WA did 134mph in the 1/4.
Thanks again
Dave
IAC noise is a common problem. My 99 makes a Woooooo sound when the A/C cycles on, or when the engine rpm is between idle & about 2000 rpm. It doesn't hurt anything, it's just annoying. Some folks have had success cleaning them as has been suggested, or replacing them to get rid of the noise. Replaced my IAC for hanging up idle, but the aftermarket IAC Wooooo's also!!!!! The Ranger is wired such that "Vent" & "OFF" is the only setting that the A/C compressor doesn't cycle.
More thoughts for pondering, let us know if cleaning helps.









