Author Topic: Hesitation, surging and crap mpg. (Read 15136 times)

darrsi · « **Reply #50 on:** 03 December 2013, 10:54:23 pm »

Quote from: Lawrence on 03 December 2013, 10:41:33 pm

TPS has been replaced (with the carbs) but I can always swap back to make sure.

From what I understand about carb icing it's mainly when the engine is cold and in cold weather. When I'm leaving in the mornings now it's ~8C outside, my garage is around 15C and it does it constantly through my 1 1/4 hr commute. Also I'm pretty sure the carb heating pipes are ok as one of the rubber joiners split recently on the way to work (thankfully about 3 minutes before I got there) and was leaking coolant.

Just checked the battery voltages, engine off it was 12.18, warm idling it was 14.03 and at 2500rpm (I don't want to piss my landlord of too much...) it increased a fraction to 14.06. Are these ok?

My TPS broke down very gradually, rather than just stopped working one day, and it was only because a couple of other people were showing symptoms as well on here that i even got to learn about it.
Just before i changed it though the bike ran a bit lumpy and erratic, it was all a bit random really, it wasn't major but definitely not right.
And after reading somewhere earlier that it can cause fuel consumption problems i thought it all sounded a bit familiar that was all.
I randomly checked it a while back 'cos the bike didn't feel quite right, and the positioning was actually off, so it is noticeable when they're not spot on.

gryphongryphon · « **Reply #51 on:** 03 December 2013, 10:56:04 pm »

Been having problems with stuttering on acceleration, eventually came to conclusion it was crap petrol, it started after I filled up from a particular petrol station.

darrsi · « **Reply #52 on:** 03 December 2013, 11:06:56 pm »

Quote from: gryphongryphon on 03 December 2013, 10:56:04 pm

Been having problems with stuttering on acceleration, eventually came to conclusion it was crap petrol, it started after I filled up from a particular petrol station.

It's a possibility, but it can also be caused by several other things as well, air filter, air leak, blocked carb needles, blocked fuel filter, unbalanced carbs, etc......unfortunately nothing's that straight forward.

Torque · « **Reply #53 on:** 04 December 2013, 11:22:39 pm »

Quote from: gryphongryphon on 03 December 2013, 10:56:04 pm

Been having problems with stuttering on acceleration, eventually came to conclusion it was crap petrol, it started after I filled up from a particular petrol station.

I've also got similar issue: [size=78%]http://foc-u.co.uk/index.php/topic,10534[/size]

I think I've checked everything I could and I think that my issue could be fuel related.
I've replaced the fuel, it did not help, however I think it could be because my tank have drain pipe blocked (only breather pipe is connected to hose).

Now waiting for Isopropylene to add some to get the water from inside of the tank.

Lawrence · « **Reply #54 on:** 05 December 2013, 02:03:28 pm »

Don't think bad petrol is the case for me, I do a tank in two days (13 litres/day at the moment, ~35mpg

), have use several different petrol stations and have even tried super in it.

Swapped the plugs out for the old ones that were removed a couple of months back and there's no change. The plugs that came out are completely black.

I didn't get this before it started running like total shite so I'm very tempted to swap the original carbs back on.

Lawrence · « **Reply #55 on:** 06 December 2013, 08:48:14 am »

Just a thought, could a dying battery cause misfiring like this? I'd have thought it's be running off the generator over a couple of k rpm, but it wouldn't start this morning (turned over, but slowly) and needed 5 mins on a charger to get going.

Dead Eye · « **Reply #56 on:** 06 December 2013, 10:07:57 am »

The electrical circuit doesn't work like that on the Fazers due to how the current / voltage is delivered to the battery. If the battery is knackered, it will read closer to full and the reg/rec will dump the excess current to ground (that's what its supposed to do).

The battery numbers listed previously didn't seem awful, but maybe a tad low. Might be worth seeing if there is anyone local you can do a quick swap with... I would have, but I'm not local anymore

If its still the case, I'd try the reg/rec as well - just in case

His Dudeness · « **Reply #57 on:** 08 December 2013, 11:41:06 am »

Quote from: Dead Eye on 06 December 2013, 10:07:57 am

The electrical circuit doesn't work like that on the Fazers due to how the current / voltage is delivered to the battery. If the battery is knackered, it will read closer to full and the reg/rec will dump the excess current to ground (that's what its supposed to do).

The battery numbers listed previously didn't seem awful, but maybe a tad low. Might be worth seeing if there is anyone local you can do a quick swap with... I would have, but I'm not local anymore If its still the case, I'd try the reg/rec as well - just in case

I see from your post you got a thou

How does it compare to the 600?

gryphongryphon · « **Reply #58 on:** 09 December 2013, 09:46:17 pm »

Just sorted my Fazer from stuttering and hesitation , it was a coil, I detected it by pull off plug leads at idle 1 at a time, 2 and 3 when removed one at once the hardly caused a deterioration in idling.When I pulled off 1 or 4 plug cap, engine at idle speed nearly stalled. So changed coil to plugs 2 and 3 , problem solved ,genuinely runs better than ever because it has had a slight stutter from low revs ever since I have owned it.

Lawrence · « **Reply #59 on:** 10 December 2013, 08:36:26 am »

I've changed coils already, I thought they might've been ok at low revs and unable to provide enough juice to spark at high revs but it made no difference :/ I'm going to get the reg/rec and cdi off today and see if I can get them tested at my local dealer.

gryphongryphon · « **Reply #60 on:** 10 December 2013, 10:47:04 am »

Yes that would have been my next move if changing coil hadnt have worked,CDI , some on Ebay for about £25 when I looked, good luck with it, I assume you have changed plug leads and caps already.
Edit . There seems to be lots of bits for sale in the forsale /wanted section.

Edit 2 drained carbs as well first thing I did didnt help me , but may help in other cases.

Lawrence · « **Reply #61 on:** 10 December 2013, 01:12:58 pm »

Just tested for a good spark on all cylinders. Pulled each HT lead off in turn, stuck a spare plug in it and held against the head. Got a white/blue spark but not a 'fat blue' spark as they describe in Haynes. Oddly though, it started up exactly the same with only three plugs connected (any three) as it does with four. Took the reg/rec off and checked with a meter, all appeared to be ok; lowest 660, highest 685 with the others spread out between. Also tried it with the reg/rec disconnected and it still misses occasionally at 4k in neutral so it's not that.

What next? Anyone got a spare CDI I can borrow to test?

Torque · « **Reply #62 on:** 03 January 2014, 10:10:13 pm »

Quote from: Lawrence on 10 December 2013, 01:12:58 pm

[size=78%]What next? Anyone got a spare CDI I can borrow to test?[/size]

I've bought one and seller does not want returns, so if you are still interested PM me.
Unfortunately for me it works the same as my old ECU.

Quote from: gryphongryphon on 09 December 2013, 09:46:17 pm

Just sorted my Fazer from stuttering and hesitation , it was a coil, I detected it by pull off plug leads at idle 1 at a time, 2 and 3 when removed one at once the hardly caused a deterioration in idling.When I pulled off 1 or 4 plug cap, engine at idle speed nearly stalled. So changed coil to plugs 2 and 3 , problem solved ,genuinely runs better than ever because it has had a slight stutter from low revs ever since I have owned it.

Did you measure that bad coil? I am curious if ohms are correct. I've got similar issue I think, I measured the coils (and they are fine), but I am curious if they can be broken even if resistance does not show it.

EDIT

Quote from: Lawrence on 10 December 2013, 08:36:26 am

I've changed coils already, I thought they might've been ok at low revs and unable to provide enough juice to spark at high revs but it made no difference :/ I'm going to get the reg/rec and cdi off today and see if I can get them tested at my local dealer.

Maybe we can temporarily exchange ECU for coils?

I did not replace mine yet, but I did not want to buy a spare since ohms are correct.

Lawrence · « **Reply #63 on:** 05 January 2014, 07:56:37 pm »

I've just tried a cdi and it's made no difference :/ I've changed:

Carbs
Coils
Plugs
Plug caps
Cdi
Reg/rec unplugged (which should rule out the generator too I think)
Tps
Removed air filter

Rubber intake pipes/joins all seem to be ok but that would cause too much air/not enough fuel anyway.

What else can it be?

Fazerider · « **Reply #64 on:** 05 January 2014, 08:29:33 pm »

Defective wiring or poor connections in the ignition circuit? Pick-up coil?

Lawrence · « **Reply #65 on:** 06 January 2014, 12:42:18 pm »

Quote from: Fazerider on 05 January 2014, 08:29:33 pm

Defective wiring or poor connections in the ignition circuit? Pick-up coil?

I've checked wiring (what I can get to, at least) and there was nothing un-toward. Where's the pick up coil and how can that be tested?

Ta

Fazerider · « **Reply #66 on:** 06 January 2014, 02:19:29 pm »

It's inside the generator cover detecting the lump on the edge of the flywheel. The pickup coil is pretty much integral with the generator because the wires exiting the cover are all bonded together in a rubber seal. Since the generator/pickup is a bit fragile when removed from the cover, getting hold of the whole assembly is probably the best solution.
A resistance test is unlikely to show a problem. You know it's working most of the time already, an intermittent short between two turns isn't easy to spot without specialist equipment. If there's an obliging foccer near you, swapping generators would be the easiest way to check.

Lawrence · « **Reply #67 on:** 07 January 2014, 09:33:17 am »

Thanks for that, I'll see what I can do

Torque · « **Reply #68 on:** 17 January 2014, 06:28:21 pm »

@Lawrence
Hi mate, any update on your FZS?

Lawrence · « **Reply #69 on:** 19 January 2014, 11:46:22 am »

Not yet, I've not really had time to look at it lately. I'm going to check cam timing at some point too.