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G8V FI failure?

jlburgess

Tuned and Synch'ed
Joined
Jan 31, 2009
Messages
41
So my bike came to a sudden stop a couple weeks back. Won't idle, but fired up at 40% throttle and limped home. Seems to fire on only the left cylinder and will idle if the right spark plug is removed, defeating the purpose of a V twin ;)

I take it to my local MG genuises and it seems there is some sort of fueling issue to the right cylinder. I think I screwed up the spark plug boot in my field diagnostic attempt while stranded, as it began arcing to the head.
It looks like the pulse to the right injector is intermittent or it is partially clogged.

Any known problems like this? The dealer thinks it's a loose wire.

I bypassed the PC-V and still no good. TPS has 5 volts at red wire. It has a Roper loaded 068 map and was running perfectly until time of failure. Both plug wires are 4.9 k ohms. The right plug look normal grey and there is no smell of fuel on it. The engine seemed to run on both cylinders above 4k rpm.
Thanks!
 
Check for arcing at the plug caps John. Take theovers off and fire the bike up in the dark. Try moving the HT leads around. If you see sparks or it bites you? That's the problem!!

Pete
 
There was a tiny hole found at the bottom of the boot. A temporary repair was made with electrical tape, but it still runs poorly at lower rpm and dies at idle. There are no error codes on the dash or Axeone.
 
Problem solved. After leaving the bike at Cascade MC for 8 days with no results, I brought the bike home, vowing never to frequent their shop again.
After 1.5 hr diagnosis, I found the spark plug had carbonized due to the boot arcing to ground. Problem solved.
I had not touched the plug wire boot for at least 2000 miles.
In hindsight, 8V riders will be keen to pack a spare plug and wire in their tool kit.
Pete's comment about the plug wire biting you was also spot on since the spark had nowhere else to go.
 
It had the replacement plug wires installed at the time of the cam recall about 12k miles ago.
 
jlburgess said:
It had the replacement plug wires installed at the time of the cam recall about 12k miles ago.

Get a set of NGK SB05E caps, Haven't heard of those failing, Yes they will angle around the plug hole

http://www.amazon.com/NGK-SB05E-Spark-P ... B0018JXLSK

21rhV8inLCL.jpg
 
draidt said:
jlburgess said:
It had the replacement plug wires installed at the time of the cam recall about 12k miles ago.

Get a set of NGK SB05E caps, Haven't heard of those failing, Yes they will angle around the plug hole

http://www.amazon.com/NGK-SB05E-Spark-P ... B0018JXLSK

21rhV8inLCL.jpg

I suppose those are easier to pull off as well right?
I was looking at the NGK-XB05F caps... They angle out about the same degree than the factory uses and are the same specs as the SB05E.
Anyone running those here?
 
I think there will be problem with the wire cover cap not fitting flush on the valve cover.
 
draidt said:
I think there will be problem with the wire cover cap not fitting flush on the valve cover.

I'll try them and if it doesn't work, I'm sure they'll fit the wife's 2V no?
 
Duhh!!!
I'm a moron... I was blinded by the angle fact of said cap rather than the fact that the 2V is a totally different set-up.
I will look into NGK caps for that bike though (inner and outer).
 
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