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"MAP Whack" How-To Learn How To "Whack It" Here :D

#1 User is offline   NVMY4N 

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Posted 09 December 2007 - 04:44 AM

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
-n00bs Click Here.
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#2 User is offline   vincewchan 

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Posted 17 February 2009 - 01:24 PM

:thumbup:
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#3 User is offline   Olegator 

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Posted 17 February 2009 - 06:55 PM

:) great! Now I know how to "Whack it!"

#4 User is offline   s2k aok 

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Posted 17 February 2009 - 07:16 PM

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)...
:troll:
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#5 User is offline   spectacle 

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Posted 18 February 2009 - 03:44 AM

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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#6 User is offline   Olegator 

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Posted 18 February 2009 - 07:04 AM

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.

#7 User is offline   foxy_s2k 

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Posted 10 May 2009 - 04:49 AM

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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#8 User is offline   S2k Eire 

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Posted 11 May 2009 - 03:55 AM

Whats the purpose of the zip ties??? Is the harness clip not enough?

#9 User is offline   foxy_s2k 

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Posted 11 May 2009 - 04:12 AM

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.

#10 User is offline   Picturepro 

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Posted 17 August 2009 - 07:43 PM

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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#11 User is offline   spectacle 

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Posted 18 August 2009 - 09:16 AM

No you won't lose your "tune". It is only effective in open loop anyway. Nothing to worry about.

I hope everyone realizes that you don't need to "whack" anything. Please read my post above.

#12 User is offline   Picturepro 

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Posted 18 August 2009 - 01:48 PM

but it sound fun to "Whack the map"

I pull the Back up fuse later today, thanks for the info

#13 User is offline   ajv85483 

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Posted 23 April 2010 - 06:33 PM

Dumb question here: Can we spray the MAP sensor with brake cleaner?


the OP said "Pinch the clip on the top of the wiring harness and slowly wiggle it back and forth to remove it. (At this time you may want to use some electrical plug cleaner, yes there is a specific name for this stuff but I can�t remember it. If you have Honda Brand Brake Cleaner, it will work � that�s what I use - if you do not do this step first be sure there is plenty of time for it to dry thoroughly)"

but where exactly do we spray the cleaner?? into the plug? the sensor??

#14 User is offline   Hero 

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Posted 12 August 2010 - 11:35 AM

another stupid question:

are you spraying the plug or the sensor? both?

:)

#15 User is offline   epicanthal 

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Posted 16 October 2010 - 11:20 PM

Did this tonight. I picked up CRC brand "Electronic Contact Cleaner" from Pepboys...$5.99. The hesitation on acceleration seems to be fixed, but the jury is still out since the problem was intermittent just like the service bulletin says.

FWIW, I did notice a pattern where the hesitation occurred:

1) If I started in 1st gear flooring it all the way to VTEC (~6200 RPM or whatever the norm is for our AP1), I had no problems with hesitation in 1st gear or shifting to 2nd, 3rd, etc. and letting VTEC engage or staying there. i.e. shifting in the 7K-9K range.

2) If I cruised first in 2nd or 3rd at low RPM (around 3-4K), then floored it getting to the point where VTEC should engage (again 6200), it wouldn't. Then somewhere between 6500-7000, the engine would hesitate. Almost like that feeling of missing a shift and my body getting thrown forward due to sudden loss of acceleration. Of course the immediate reaction is to let off on the gas.

I would say in the last couple of months, I had this problem happen about a half dozen times. I knew about this fix since the first time it happened maybe a year ago, but I don't drive the car often and I was just too lazy until tonight. All I have to say is "Thank you S2KI community!"....Awesome.


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#16 User is offline   zeroptzero 

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Posted 17 October 2010 - 07:02 PM

I used electrical contact cleaner on mine , plus I sprayed some down the small hole that goes to the manifold from the MAP sensor. It seemed to work perfectly, didn't need to worry about whacking it at all.
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#17 User is offline   whiteflash 

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Posted 17 October 2010 - 10:11 PM

I used carb cleaner since... you know, it is carbon we're trying to get rid of. Food for thought.
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#18 User is offline   PWRMKR 

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Posted 17 October 2010 - 11:05 PM

Quote

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.


Where are you getting this from?


The "MAP WACK" was a kind of/sort of fix for engine hesitation at high rpm. Honda checked it out and released Service Bulletin 04-073, "Intermittent Hesitation During Hard Acceleration" back in 2004.

Read the link the OP provided at the top of the page. :rolleyes:

If it makes you feel good wack and spray away. I’ve not wacked or sprayed mine in years.
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#19 User is offline   SorakS2K 

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Posted 07 November 2010 - 10:47 PM

I just did the "MAPwack"on my03. :thumbup:
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#20 User is offline   lilsharky 

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Posted 19 January 2011 - 03:29 PM

i tried the map whack and iac cleaning yesterday night. everything was fine after resetting the ecu but it came back after about 10 mins of driving. would i need to get the map sensor now? will this work? http://cgi.ebay.com/ebaymotors/NEW-DENSO-M...sQ5fAccessories

#21 User is offline   lilsharky 

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Posted 21 January 2011 - 04:10 PM

^^anyone can chime in?

#22 User is offline   PWRMKR 

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Posted 21 January 2011 - 06:04 PM

Quote

http://cgi.ebay.com/...sQ5fAccessories

This listing (2705559236) has been removed, or this item is not available.
Please check that you've entered the correct item number
Listings that have ended 90 or more days ago will not be available for viewing.


If you think it's the MAP just get a new one from Honda.

#23 User is offline   lilsharky 

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Posted 21 January 2011 - 08:01 PM

i dont know the part number for it..the one i found here was for 118 that comes with map sensor package??

edit: just tried the link heres the new one they put up http://cgi.ebay.com/ebaymotors/NEW-DENSO-M...=item3efe63c4ae that is $15 more!!

This post has been edited by lilsharky: 21 January 2011 - 08:06 PM


#24 User is offline   americandrug 

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Posted 31 January 2011 - 01:04 AM

honda dealership would be the way to go. not saying all sources on ebay are horrid but i've had my fair share of bad parts, mostly electronics; wrong part, cracked/chipped, wouldn't work.. def get it from honda.
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#25 User is offline   j2damilla 

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Posted 04 February 2011 - 11:05 PM

When I had my is300, I ran into a similar problem which I needed to clean the MAF sensor with electronics cleaner. Could I use the same electronics cleaner to clean the MAP sensor in my AP1? It's the kind that leaves no residue.
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