Continuing - So what did you do to your bike today...?

[Kiwifruit]

Hope you've found it Eric   

[Endless]

Been following this, would be huge relief if it's as simple as a plug. I've had mine in the shop waiting for me to register after passed inspection. Been raining near non stop for 3 weeks, finally got to RMS to register, after 4 hours due to some error on Allianz' behalf that even they couldn't understand, she's ready. Bike mechanic is reluctant to entertain a conversation about any other possibility of the bike running rough other than the PC3. They placed the fouled plugs in a ziplock bag for me to look at, along with a heap of water.. Will collect the bike run it for a bit, pull plugs and go from there.

[Eric GSX1400K3]

Picked up the new plugs today, unfortunately haven't had the time to fit them,  but I did check their resistance straight out of the box, all 4 a steady 4.48k Ohm, which is correct by all accounts for R type plugs. Let's see what today brings...

[Endless]

All the digits crossed for you mate!

[grog]

Eric, sure hope its the fix. We need to hear an ending, a happy ending. Ive named your bike Bilbo, one of the longest stories weve had😂😂

[GSXKING]

@Grog Greg you just made me laugh out loud 😂😂😂😂
Bobbie saying what's so funny 😜😜😜

[Eric GSX1400K3]

Well, OK, Bilbo it is, and yes its indeed a saga of epic proportions.

So today Bilbo got 4 brand new plugs to go along with the 4 new injectors already fitted. Rechecked vac lines, ht lines and battery voltage. Hit the starter and. . .




No f#$%&(#@g change. Still stumbles and carries on, won't idle properly and when increasing revs, spits and pops.

Also checked the fuel pump relay, as thats also in the last section 4 of the manual

It says to check for continuity across terminals 1 and 2 without power, and then applying 12v to the relay checking again

I did that and got o.l on my multi meter on both occasions, indicating that the fuel pump relay is toast, however i get pump priming, suffient flow rate and bike runs (albeit not well).

Still getting the backfire/miss through the airbox, like the cam timing is off, so next is to pull the rocker cover and check where the cam sensor picks up.

Sorry to disappoint...

[Hooli]

I'm starting to wonder about the crank sensor under the RH engine cover too.

Although I can't see how it's that or the cam sensor as they're hall effect & I believe tend to fail at higher revs first as they get less time to react on each pass of the trigger.

I know you've checked it all, but low revs/throttle & working at higher speeds does point to the MAP sensor as that isn't used above a certain rev/throttle position (not that Suzuki has ever told us what that point is).

Must be very frustrating for you.

[Eric GSX1400K3]

Cheers Hooli, the crank sensor had a broken magnet, but I've glued that back together and seems ok, but right now doubting everything.  Agree re MAP sensor, will see if I can rig up a vac pump ( I have a vac rig for the BMW cooling system) and test both the IAP and MAP, I see they aren't cheap to replace either...

The manual also mentions a cam sensor pin, not sure what thats referring to, so need to check up on that.

[Hooli]

I think I've got a spare MAP sensor from when I suspected mine too far to post or anything though, probably much cheaper from webike Japan. Just thinking it through, I think you've already covered this though. The PAIRs valve, if still fitted, isn't leaking vacuum? Plus the actual holes on the TBs the vacuum pipes go on to are clear?

Not sure on the cam sensor pin, maybe it means the 'lump' on the intake cam that triggers the sensor on each revolution?

[Eric GSX1400K3]

Good tips mate, the vac ports on the tb's are clear, as i pull one off, the idle changes, can do that for each one.  Will check the pairs reed valves think they are still in, plus their blocked off hoses.

[Hooli]

I was thinking the Pairs valve the vacuum pipe goes too, I'd assume it's possible for them to fail internally and leak.

Something I've just thought of, if you disconnect the MAP sensor electrically what happens? It'll throw a FI light & run with a default pressure reading, but if it's still rough & spluttery it rules out the vacuum system as the fault because you've said the pipes are ok so there's no leak.

[Eric GSX1400K3]

Something I've just thought of, if you disconnect the MAP sensor electrically what happens? It'll throw a FI light & run with a default pressure reading, but if it's still rough & spluttery it rules out the vacuum system as the fault because you've said the pipes are ok so there's no leak.

Will check  Pairs removed long ago, std covers in place, but will check them again tomorrow.

With disconnecting MAP, yes FI code will pop up. Thinking this through, if it drops into a default pressure reading and still stutters, then this effectively rules out the MAP being defective, as with a set pressure, it should idle steadily.  I will still check and try my vac pump idea.

Really appreciate all the ideas and encouragement, I'm sure I'll get it fixed.

[Hooli]

It's a puzzling one for sure.