jambojeef
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| posted on 14/3/09 at 02:44 PM |
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Very odd VFR800i Problem - Geniuses, this one's for you
Right then,
Gonna need some help here! Just bought a 2001 Honda VFR800 as a project bike - its been mucked around with it bit but getting to the bottom of the
matter it doesnt start.
There is no spark and the "FI" light is on.
Fuel pump doesnt prime when the ign is first turned on which it should - and heres the weird bit - if you just leave the ign on and scratch your head
(believe me Ive tried!) it clicks a bit and then the fuel pump runs for a few seconds - during which time its filled one of the front cylinders with
fuel!
Whats going on? Have checked the resistance of the injectors and they are all within range + ive tested virtually all of the sensors and they are also
within range.
Any help extremely gratefully received!!
Geoff
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owelly
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| posted on 14/3/09 at 02:48 PM |
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Fuel rail pressure switch cut out?
Having a haed that clicks can't be helping...
http://www.ppcmag.co.uk
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owelly
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| posted on 14/3/09 at 02:49 PM |
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Have you whipped the injextor out and tried them?
http://www.ppcmag.co.uk
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jambojeef
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| posted on 14/3/09 at 02:59 PM |
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Cheers for the suggestion - no I havent taken the injectors out - the reason being I can't connect the tank and take the injectors out at the
same time owing to the HP fuel hose being really short.
Also - just checked the wiring diagram and there isnt a pressure "swtich" as such - just a regulator on the end of the fuel rail.
Geoff
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jambojeef
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| posted on 14/3/09 at 03:53 PM |
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Ok, after a bit more poking around - the injectors are constantly open when connected to their harness.
I have yet to discover whether they are doing this because they're being told to by the ECU or there is a short in the wiring...
A job for tomrrow perhaps!
(Hope it is the ECU - Ive just ordered another one and it wasnt cheap!!)
Geoff
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stevebubs
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| posted on 14/3/09 at 04:24 PM |
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quote:
Originally posted by jambojeef
during which time its filled one of the front cylinders with fuel!
Sounds like a short in the injector wiring. Had this on my dad's Rover 75 when some muppet didn't route the wiring loom properly after
fixing a cooling problem.
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omega 24 v6
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| posted on 14/3/09 at 04:26 PM |
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It's normal for the inj to be switched negative through the ecu. Easy enough to unplug the loom ???? If so meter between the inj neg and ground
if it reads clear your OK if not you've got a short.
BUT if it's clear (and i don't no owt about bikes) when the looms disconnected at the ecu then I'd suspect the internal ecu
transistors the do the switching  Sorry i hope it's not that.
If it looks wrong it probably is wrong.
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jonno
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| posted on 14/3/09 at 07:47 PM |
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quote:
(Hope it is the ECU - Ive just ordered another one and it wasnt cheap!!)
Geoff
sorry cannot help but theres one on ebay !!
http://cgi.ebay.co.uk/GENUINE-HONDA-VFR800-VFR-800-VFR800F-CDI-IGNITER-ECU_W0QQitemZ370168191630QQcmdZViewItemQQptZUK_Motorcycle_Parts?hash=item370168
191630&_trksid=p3911.c0.m14&_trkparms=72%3A1683%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318
having fun on a budget 
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tks
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| posted on 15/3/09 at 10:44 PM |
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quote:
Originally posted by omega 24 v6
It's normal for the inj to be switched negative through the ecu. Easy enough to unplug the loom ???? If so meter between the inj neg and ground
if it reads clear your OK if not you've got a short.
BUT if it's clear (and i don't no owt about bikes) when the looms disconnected at the ecu then I'd suspect the internal ecu
transistors the do the switching Sorry i hope it's not that.
mhh you ned to specify more clearly what you are measuring voltage???resistance???
if you just put contact on you need to measure 12volts on both of the terminals.
has the 2001 bike got hiss??
If the FI light stays lit i would do a read up...because it needs to turn off after a while...
You need to join the 2 wres close to the ecm its the diagnose mode connector. join them and then put contact on.
if you do it right the light will start blinking. small blinks are ones, large blinks are tenths for example
2x short blinks and a large one means
12 = "Injector number 1 failure"
if it stays lit, then you can have a number of failures.
[Edited on 15/3/09 by tks]
The above comments are always meant to be from the above persons perspective.
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