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Old 08-07-2014, 09:06 PM   #1
Guzz OP
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Location: Tempe AZ, USA
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'00 1150GS issues

OK I'm at a loss for what to do now.

I decided to do some maintenance on my '00 GS. Oil, Oil Filter, Air filter, fuel filter, spark plugs. On the oil side, I moved to full synthetic (it was on sale, cheaper than dino).

The bike ran like shit.

I then took off the TB's and cleaned them all out (they were past due) and did a sync. Still ran like shit.

Adjusted the throttle position sensor. Still shit (verified that it is giving proper voltages on the low, and high side).

Adjusted the HES for timing. Still shit.

Replaced the O2 sensor. Still shit.

Reset the Motronic. Still shit.

Put some SeaFoam in the tank to clean the injectors and such. Still shit.

Doing the TB sync, I use an old mercury carb stick, and have them synced to a few millimeters at idle and at 4,000 RPM (actually the best I've ever done).

One thing I've noticed is that adjusting the idle air screws (Big Brass Screws) is that they really don't change the idle anymore like they used to. I could screw them all the way in, and the bike would die when at operating temp. Now, the bike keeps running. I can screw them out way past what they should be and the bike stays at 1100 rpm 50.

I've checked the manifold boots for leaks, nada.

What I'm experiencing is bad cold starts. Bad, really bad, hesitation when acceleration. Stalling when pulling away from a stop. Also really, really bad gas mileage. The spark plugs are to new to tell what's going on, as they are still white.

I'm at a loss. Anyone have anymore suggestions on what to try?
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Old 08-07-2014, 09:10 PM   #2
rockydrxrvr
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Cracked a spark plug?

You changed plugs. A small chance you cracked a insulator on the new plug installation?
Only happened to me once before.
Take a look, ---just fishing for a simple fix for ya.
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Old 08-07-2014, 09:18 PM   #3
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I can put in the old plugs tomorrow just for grins and giggles.

But I did pull the new ones today just to verify the gap, and looked them over for color. No noticeable cracks, but I know that sometimes the cracks can be smaller than what can be easily visible.
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Old 08-07-2014, 10:12 PM   #4
def
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Just FYI, I use Autolite 3923s in my '01....$2.00 each. I typically get about 40,000 miles from a set. Lifetime mileage for my GS is about 42.5 MPG and just recently began improving (44.2 MPG) when I changed oil and plugs.

Is your charcoal canister still installed? If so, with age, the canister may allow some carbon fines to be ingested into the engine through the TB vacuum ports. Mine does. Clean those ports with carb spray.

Next, remove the BBIABSs and clean the needles and the ports with carb spray.

Make sure that you have good o-rings everywhere especially the fuel injector o-rings at the engine (delivery) side. I lube them lightly before re-installing them.

Is an oil type air filter (K&N) installed?

Any obstructions in the air intake? I have found rodent nests in my airbox.

Have the factory idle screws been tampered with?

Good luck.

Go Sundevils.
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Old 08-07-2014, 10:25 PM   #5
def
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I just reread your post. You say you changed the fuel filter? Is your filter still inside the tank? If so, did you reverse or misfit a line? Possible that a line came off inside the tank. Did you replace the lines, clamps? If so, with what?

If OE, those lines are now what, 14 years old? They are cracked and you're likely not getting the correct fuel delivery.

I attended ASU when Frank Kush was head football coach. Grady Gammage was the head man and I studied Mechanical Engineering so, I know what I'm talking about. (Pay no mind to my wife who says I have no idea what I'm talking about).

Good luck
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Old 08-07-2014, 10:25 PM   #6
dogsrule
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Stick coils?
See discussion by Steptoe on checking them. 1150's are the best!

Tom

Good luck
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Old 08-07-2014, 10:26 PM   #7
def
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Originally Posted by dogsrule View Post
Stick coils?
See discussion by Steptoe on checking them. 1150's are the best!

Tom

Good luck
The '00 is single spark...no stick coils. The single spark oilheads use a wasted spark ignition system. You could hook up the sparkplug wires backwards and the engine would run just fine.
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Old 08-07-2014, 11:13 PM   #8
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Right side throttle cable not seated?
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Old 08-08-2014, 01:09 AM   #9
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Quote:
Originally Posted by Guzz View Post
OK I'm at a loss for what to do now.

snip

One thing I've noticed is that adjusting the idle air screws (Big Brass Screws) is that they really don't change the idle anymore like they used to. I could screw them all the way in, and the bike would die when at operating temp. Now, the bike keeps running. I can screw them out way past what they should be and the bike stays at 1100 rpm 50.

I've checked the manifold boots for leaks, nada.

What I'm experiencing is bad cold starts. Bad, really bad, hesitation when acceleration. Stalling when pulling away from a stop. Also really, really bad gas mileage. The spark plugs are to new to tell what's going on, as they are still white.

I'm at a loss. Anyone have anymore suggestions on what to try?
That sounds really close to the symptoms of an air leak I had in my intake tracks, at the TB ends, vs the manifold side.

The thing is on mine the manometer clearly showed an imbalance which you aren't seeing.
Does the manometer show a big change when the throttle is opened?
Or does it stay fairly even?

It could be that a fuel injector is dribbling or leaking, but you should see that on the plug.
Or if one of them is 'dead' (or dying)
Or if the fuel pressure is low (regulator or pump etc)

At least a few things to check.

JJ
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Old 08-08-2014, 08:06 AM   #10
cele0001
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water in the fuel tank
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Old 08-08-2014, 08:14 AM   #11
Tmaximusv
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Assuming you checked, did you check where the RH throttle cable goes into the ferrule? If it's not set in properly, you'll get a crappy running bike that won't idle. DAMHIK
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Old 08-08-2014, 08:24 AM   #12
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I assume the bike ran ok before you started the maintenance right?
What is your fuel pressure? Should be 43psi.
Low pressure = poor performance.
"U" hose inside tank is prone to splitting on this vintage.
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GS Addict screwed with this post 08-08-2014 at 08:41 AM
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Old 08-08-2014, 08:25 AM   #13
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Quote:
Originally Posted by Tmaximusv View Post
Assuming you checked, did you check where the RH throttle cable goes into the ferrule? If it's not set in properly, you'll get a crappy running bike that won't idle. DAMHIK
Almost a rite of passage
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Old 08-08-2014, 08:29 AM   #14
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Quote:
Originally Posted by SJSharkfan View Post
Right side throttle cable not seated?

Happened to me. Lost my mind!
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Old 08-08-2014, 08:37 AM   #15
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Upon closer reading I think this one will end with seating of the right side throttle cable.
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