dilley
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| posted on 11/1/11 at 09:15 PM |
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Hayabusa running problem
I have the Hayabusa buggy running but it is not great...I have cleaned the injectors, fitted new plugs and gapped them, I am running an after market
sausage type Pipercross filter, art race cans, airbox has been removed, pair system removed, I only have the vacum pipes going to the MAP sensor. At
full throttle the engine seems fine, low revs are jerky with what seems to be a miss fire, poor idle. If I disconnect the MAP sensor the engine idles
fine and the revs seem smooth throughout the rev range, I have only tried this with the buggy in the garage and not driving down the road, I have
tried a differentMAP sensor and I have the same problem!! I have checked the wiring and all seems fine!
Andrew.
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cosmick
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| posted on 11/1/11 at 10:13 PM |
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Hi Andrew,
If your engine runs better with the MAP sensor disconnected, I presume you mean electrically disconnected and not just disconnecting the vacuum?
The MAP sensor needs to read a strong vacuum at idle and the chances are that the reason your engine is running worse with it connected is because
there is either a low vacuum or the wrong information is being picked up.
Are you sure that the MAP sensor is connected to all 4 manifolds and not the Atmospheric sensor connected to all 4 manifolds? If these 2 sensors are
back to front, the engine will run terribly rich.
I would suggest that the engine is running very rich until you disconnect the MAP sensor.
Disconnecting it will bring in a default programme which will make the engine run nearly perfect without the MAP pressure reading.
Can you tell me the colour of the wires going to the MAP sesnsor and the Atmospheric sensor?
Can you tell me the part number of the MAP sensor and Atmospheric sensor?
Has this engine been apart for any reason?
A photo of the sensors would help.
If it can't be fixed with a hammer then its probably an electrical problem.
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dilley
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| posted on 11/1/11 at 11:20 PM |
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Hi cosmick, Yes, MAP sensor electricaly disconected...My engine is 99-2000 spec, The MAP sensor and atmospheric plugs are different and cannot be
mixed up. The engine came from Malc but was recassed in 2005 by Holeshot Racing according to a sticker on the back of the engine. wires to the Map
sensor are-red, brown/black,green/black, (from memory!) I will check in the morning.
Andrew.
ETA- MAP sensor has 2 codes on it -15620-02f00,
100798-4210.
[Edited on 11/1/11 by dilley]
Atmospheric sensor has red, brown/black, green/yellow.
[Edited on 12/1/11 by dilley]
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cosmick
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| posted on 12/1/11 at 09:54 PM |
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OK,
According to your colours, the sensors are correctly connected. Do you have all 4 hoses connected to the MAP sensor?
Try running the engine with the MAP sensor connected electrically but sucking the hose with your mouth instead of connecting it to the manifolds. try
increasing and decreasing the suck without changing the idle speed. I want to know if the idle improves with high or low vacuum.
If it can't be fixed with a hammer then its probably an electrical problem.
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dilley
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| posted on 12/1/11 at 10:03 PM |
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Hi cosmick, yes all 4 vacum hoses are connected, I have tried sucking and blowing into the sensor and it appears to make no difference....I am
wondering if the ECU is faulty?? or maybe the engine is non standard?
Have also checked the water temp and inlet temp wiring,again this is wired correctly.
[Edited on 12/1/11 by dilley]
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cosmick
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| posted on 12/1/11 at 10:31 PM |
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Hi Andrew,
Well, I don't understand. Even if the engine was non standard, the MAP sensor should still read vacuum. I am lost to help any further at the
moment. I would gladly have a look at it but Suffolk to Sussex is quite a way.
cosmick
If it can't be fixed with a hammer then its probably an electrical problem.
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dilley
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| posted on 13/1/11 at 02:01 PM |
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I have double checked this... If I suck the pipe on the map sensor the revs increase and tick over is better, I can just about reach the throttle and
it seems to rev clearer.
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