"MAP Whack" How-To - S2KI Honda S2000 Forums



"MAP Whack" How-To

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Old 12-09-2007, 01:44 AM   #1
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Default "MAP Whack" How-To

DISCLAIMER - I do not guarantee any procedures or products demonstrated below are the best for your specific situation, as I cannot be there beside you to watch your every move. Please Read Very Carefully, feel free to PM me with Questions.
So basically what I'm trying to say is - if you screw something up - it's not my fault.

December 3, 2004 Service Bulletin 04-073, "Intermittent Hesitation During Hard Acceleration". Install new map sensor and holder kit
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Old 02-17-2009, 10:24 AM   #2
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Old 02-17-2009, 03:55 PM   #3
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great! Now I know how to "Whack it!"
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Old 02-17-2009, 04:16 PM   #4
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i was wacking it for a while before, car wouldn't engage into vtec. i bought another brand new map sensor but i fixed it with the zip ties. so, i have an extra map sensor. definitely this before buying another map sensor (which may be unnecessary)...
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Old 02-18-2009, 12:44 AM   #5
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The map whack is a myth. The root problem is carbon buildup in the channel that leads from the map sensor down to the throttle body. The "whack" loosens the deposits there temporarily and allows the sensor to read correctly, which is why the symptoms return after time.

Remove the map sensor and clean the channel with brake cleaner. Problem solved.
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Old 02-18-2009, 04:04 AM   #6
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actually that is not quite true.
If you consider that the MAP sensor is a MEMS device (micro electric mechanical system), then hitting it has a bossibility of loosing a moving part. MEMS biggest problem is contamination and sticking.
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In retrospect, carbon build up seems more realistic.
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Old 05-10-2009, 02:49 AM   #7
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This worked perfectly for me, when I had the exact same symptoms. Wanting to stall pulling away from lights, random fuel cut offs between 4 and 6000 rpm.

Not only that, but my idle is lower and smoother than ever, and I'm sure I have more power between 4 and 6000rpm now.

I did the whack and the ecu reset simultaneously, so I don't which had the biggest effect.
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Old 05-11-2009, 01:55 AM   #8
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Whats the purpose of the zip ties??? Is the harness clip not enough?
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Old 05-11-2009, 02:12 AM   #9
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It's a safe assumption, since if you buy a new MAP sensor from honda, a specially shaped heavy duty zip tie is included. This was not on original models.
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Old 08-17-2009, 05:43 PM   #10
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quick Question

I've whacked my map and now wanting to reset the ecu

Will I lose the Apexi vtec tune?? It is plugged into the "Frog harnes"
no extra wires were cut or spliced
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