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Old June 24th, 2015   #11
Wjbertrand
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Default Re: Ignition problem?

Update: There's both good and bad news to report. First the good news: The aftermarket Honda car TPSs work fine on the ST1300, they are electrically and physically identical. make sure to record the voltage outputs for your old TPS before replacing it so you can use them to calibrate the new TPS. The other option is to use the standard Honda spec of 0.45V throttle closed and 4.5V throttle fully open. This might be a good Wiki note if anyone ever needs to replace the TPS, though I suspect this will be extremely rare. Here's the one I used:

http://www.ebay.com/itm/201358243368...%3AMEBIDX%3AIT

The bad news is that the result is - no change in the miss-firing problem at all. I tried running the bike at the troublesome RPM with my garage darkened to see if there were any arcs or leaks from the high tension leads of the coils, but there were no fireworks. I'm moving on to the coils as my primary suspect(s). Also, I think I recall seeing a post somewhere for cheap aftermarket fuel pump replacement?
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Old June 24th, 2015   #12
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Default Re: Ignition problem?

Search:
Fuel Pump and Related Part Numbers
Sept 17 2013

Or the source.

http://www.highflowfuel.com/ag-81184...1300a-efi.html

Paul

Last edited by PaulRB; June 24th, 2015 at 12:21 PM.
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Old June 24th, 2015   #13
Wjbertrand
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Default Re: Ignition problem?

Thanks Paul. Interesting, looks like they are actually located in Ventura!
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Last edited by Wjbertrand; June 24th, 2015 at 02:46 PM.
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Old June 25th, 2015   #14
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Default Re: Ignition problem?

Had these fuel pump links stored in my "useful info" archives:

http://www.st1300.us.com/showthread....ight=fuel+pump

http://www.amazon.com/HFP-382-Intank...dp/B004MUI7OA#
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Old June 25th, 2015   #15
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Quote:
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Thanks Mick! Good information here. This will be my next step after sussing out the coils and spark plug wires. I've been googling for "light throttle stumble at highway speeds" and getting a few hits on various Ford Crown Vics and GMs with the 3800 V6 where similarly described behavior was fixed changing the coils. Kind goes against my experience where coils & HT wires are more like likely to falter under high load (maximum cylinder pressure) than what I'm experiencing. But with these computerized systems today, who knows?
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Last edited by Wjbertrand; June 25th, 2015 at 08:33 AM.
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Old June 25th, 2015   #16
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Default Re: Ignition problem?

A stumble at a fairly specific RPM doesn't seem like a fuel delivery issue to me so I'm thinking it sounds electrical.
I've seen loose battery terminals show up similar to a stumble on Magnas in the past and they would drive through the stumble and clear.

I would assume during your connectors check you looked at the battery but how about the other end of the ground cable.
I'm not sure where the other end is even attached.
I would assume at the master ground on the frame but I don't recall paying much attention to what is actually attached there.


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Old June 25th, 2015   #17
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Default Re: Ignition problem?

Quote:
Originally Posted by PaulRB View Post
A stumble at a fairly specific RPM doesn't seem like a fuel delivery issue to me so I'm thinking it sounds electrical.
I've seen loose battery terminals show up similar to a stumble on Magnas in the past and they would drive through the stumble and clear.

I would assume during your connectors check you looked at the battery but how about the other end of the ground cable.
I'm not sure where the other end is even attached.
I would assume at the master ground on the frame but I don't recall paying much attention to what is actually attached there.


Paul
I of course checked the battery cables first, I can see were the (+) one goes to the starter relay and that is all clean and tight. Even with both farings, the fuel tank, air box assembly and throttle bodies removed I still cannot see to trace were the (-) attaches, presumably to the frame or engine somewhere. Too much stuff in the way. I still need to run this down and make sure it's tight and clean.
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Old July 2nd, 2015   #18
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Default Re: Ignition problem?

Latest Update:
Thanks to Joe for the loan of a known good coil. Tried it on both the left and right sides with no joy, misfire problem remains. In addition to the coil test, I unscrewed each spark plug cap from its lead, snipped about 1/4" off and screwed the wire back into the cap, renewing the connections. I swapped out the fuel cut relay, inspected the cam position sensor and harness, disconnected and cleaned all 4 injector connectors. Disconnected and cleaned every connector I could access. I've inspected every inch of harness that I can see. Nothing looks suspicious.

The last idea I have is the fuel pump, but I'm bothered to explain the bouncing behavior of the tachometer needle when the misfiring occurs if it's the fuel pump though...
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Old July 2nd, 2015   #19
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Default Re: Ignition problem?

Worst case scenario is you end up with a spare fuel pump.

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Old July 2nd, 2015   #20
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Default Re: Ignition problem?

Did you drain and flush the lower tank, or inspect the interior?
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