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Guest haliant

THROTTLE POSITION SENSOR/ MAP SENSOR

9 posts in this topic

My X11 is seven years old and has covered 43,000 trouble free miles, until now. It now has a very erratic running problem at 5000 rpm in top gear approx 80 mph. The throttle seems unresponsive until moved to a certain point and then it feels like nitrous has kicked in, the bike then accelerates up to about 100 mph. The bike is totally standard apart from race cans which were fitted when the bike was purchased new.

Honda main dealers have advised that the fault is the throttle position sensor or as they call it the "map snsor" and this small potentiometer is priced at £221 + vat! any answers or ideas will be greatly appreciated. cheers.

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Does your FI light flash at you, with the engine running and side stand down?

If yes, count the flashes and post back... note there may be differences in the flash rate, ie long ones and short ones!

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The TPS and map sensors are two different things, both send signals back to the ECU. The TPS is just what it says it is a potentiometer that is fixed to the shaft that runs through the throttle bodies that the butterfly valves fasten to, it sends a signal back to the ECU to relay the position or degree of opening of the throttles. The potentiometer is basically a variable resistor and the resistance alters as the throttle is opened and closed, this is how the ECU works out where the throttle position is. The TPS is a common failure on some bikes because the sensor gets worn if the bike is held in a certain position for long periods (motorway cruising)

The TPS can be tested by putting an ohm meter on the terminals and opening and closing the throttle, the middle pin is usually common with the outer pins giving a reading in opposite directions (high resistance when open, low resistance when closed). Be very careful if the TPS is removed, it's original position must be marked exactly otherwise the bike will need to have the TPS reset because it wont see 0-100%, this will have to be done on a dyno to get it spot on. As far as iam aware Honda don't sell the TPS as an individual spare, but if you find out differently please pass that info on.

The MAP sensor is basically a pressure switch that measures the Manifold Absolute Pressure, i have never had any experience of these failing but as Eddy points out the number of flashes on the FI indiccator will identify which sensor is faulty. My gut feeling is that the TPS is the more likely cause because you can ride through it and come out at a higher engine revolution with good performance, The stuttering may be the TPS struggling to work out what position the sensor is at due to wear on that one spot then when the throttle opens a bit more it gets a good signal to the ECU.

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Just like "Standish honda" says: As far as iam aware Honda don't sell the TPS as an individual spare, but if you find out differently please pass that info on.

Copy that, we had one 900 Hornet that was suffering some problems, it ate plugs like bread etc, didnt give any fault codes.

Tps was faulty, offical importer delivered us new whole throttle body with sensor (by warranty), they told us that Honda dont give those sensors like Yamaha and some other brands. Ok, we didnt change whole thing, just the sensor, measured ohms when throttle was closed and when it was fully open (from the brand new assembly). Then we changed the sensor and adjusted it like it was. Problem solved, and it was ok with the offical importer. Whole thing costed something like 8-9 hundred euros, lucky that the warranty was ok. Now i have brand new throttle body without sensor...

If we had to change the whole thing we would have to drop off the engine from that Hornet, it is so tight place where the throttle body was surrounded by the frame.

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As Henri has said it is a complete throttle body or a second hand TPS, the problem could be that gong down the second hand route is a lottery as you ould be buying the same problem but in a differentr throttle position. As all throttle body sensors seem to made differently even for Honda models it means the X11 only shares the same sensor as the blackbird and a second hand blackbird sensor will have a flat spot slightly higher in the rev range due to different gearing. The cheap fix is to cut the back off the sensor and claen it with contact cleaner but that is not a gauranteed fix because normally the track is damaged in the sensor. Honda want £1500 for a set of new throttle bodies.

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Honda want £1500 for a set of new throttle bodies.

Where do they get this shit from.... fer fooks sake you can buy a tidy(ish) 2nd hand x11 for that! Gits...

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Most breakers will only sell the complete set of throttle bodies, they wont split the sensor from the body as they probably know one is useless without the other. The blackbird throttle bodies are the same as the X11 i'am 99% sure, best way to check is to go to a dealer or someone with the part fiche and check before spending on second hand.

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Hi....Hope this helps.....The small electronic gizmo on the throttle bodies is described as "Sensor Assembly Map" and the part number for the X is 37830-MAT-E01 which is the same part number as on all injected Blackbirds.However the throttle bodies are NOT the same part numbers........but that doesn't mean to say they won't fit though........Steve

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Some throttle bodies for sale on that world famous auction site Item No 150290546709 £99.99 buy it now or make an offer.Don't know if they're complete but the guys phone number is displayed in the ad....Steve

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