Does your '07 hesitates when lightly blipping throttle when cold?

[ELP_JC]

Noticed my bike idles smoothly, but if I blip the throttle normally (didn't try it aggressively, since motor had 0 miles), it hesitates (stutters, in other words). Did it again in my house after a 35 mile run, which should be enough for the ECU to adjust.

It's obviously running lean, hence the hesitation. ECU is not enriching the mixture enough for proper cold motor operation. Same problem my BMW had, but after an ECU change, it responded instantly, even if just started in much cold weather than now.

I bet the +4 CO change corrects this. BUt the question is if it's part of the stumbling/surging problem. We're getting closer gentlemen. For now, please let the board know if you have that hesitation, to finish connecting the dots. Thanks.

JC

 

[C&C]

The ECU is programed to not allow quick throttle blips until it comes off of cold idle. This is built in protection. If you are experiencing a noticable lag, after warmup, then perhaps it's time to bring it back to the dealer.

 

[noob]

JC I had a reputable mechanic tell me that fuel injected bikes should not have the throttle blipped when it's warming up. He said it's what causes the starter valves to become whacked.

I've had others say that was BS, but they do become whacked some how, that's why we do TBS. Anyway, every fuel injected bike I've had has run very well, and I attribute part of that to never blipping the throttle until the engine has warmed up at least part way.

Regards,

 

[ELP_JC]

Thanks for the responses guys. Every FI vehicle should respond to throttle input smoothly, even when just started. Try it on your car and you'll see it revs smoothly.

Anyway, I was just blipping it a little bit when cold (not even 2K rpm); nothing's going to happen. And by 'cold' I mean 80º+ gentlemen; I'm in TX.

Well, engine hesitates when blipping even when fully hot (fans engaged), which is a clear sign of too lean of a mixture. I have no choice but to increase the CO levels to richen the mixture a bit. Idle is a bit erratic as well, so a TB synch is in order too.

So now let me rephrase the question to avoid 'controversy': when your engine is hot, if you quickly blip and release the throttle, does your engine hesitates? Thx.

JC

 

[PA1195]

Thanks for the responses guys. Every FI vehicle should respond to throttle input smoothly, even when just started. Try it on your car and you'll see it revs smoothly. Anyway, I was just blipping it a little bit when cold (not even 2K rpm); nothing's going to happen. And by 'cold' I mean 80º+ gentlemen; I'm in TX.

Well, engine hesitates when blipping even when fully hot (fans engaged), which is a clear sign of too lean of a mixture. I have no choice but to increase the CO levels to richen the mixture a bit. Idle is a bit erratic as well, so a TB synch is in order too.

So now let me rephrase the question to avoid 'controversy': when your engine is hot, if you quickly blip and release the throttle, does your engine hesitates? Thx.

JC

BM +4 helped mine lots but I can sometimes still beat the FI if I move it fast enough off idle when showing 4 Bars...at higher RPM's never a hiccup in or out of gear...a sweet running machine but no big hills nearby...my goal when I get my Staintune cans soon is to run a CO sniff on the stock can and on one of the Staintunes at the same time to see what +5 gives me from each and adjust from there...not too sure though what value to shoot for but 1-2% at idle from the Staintune seems reasonable, but also not sure what the second Cat in the stock can or will do (no thread hijack intended).

Gary in Fairbanks

 

[Heet]

I own a 06 and I have noticed the hesitation when it is warm outside. In the morning on the way to work I have no problem and it runs smoothly. When I go to leave around 4-5 pm when it is in the mid to upper 80's the bike runs really rough. If I slowly turn the throttle I can see the tachometer jump between 1k and 3k rpms. I took it to the dealer; the said it did not sound like the throttle position sensor. The took out the air filter and the bike still did it; then we took off the tank and changed the spark plugs, bike still does it. We went out and the checked an 07 on the floor and it also has the hesitation. The only thing I was not able to duplicate at the dealer was the bike running really rough when it is in the upper 80's. The dealer wants to sell me a power commander or the cobra; he thinks this will fix the hesitation. Any thoughts?

 

[dwilli]

So now let me rephrase the question to avoid 'controversy': when your engine is hot, if you quickly blip and release the throttle, does your engine hesitates?

Yes

 

[Heet]

I guess I should clarify my question/comment. I did not research the hesitation issue prior to taking it to the dealer. The dealer did not seem aware of it either. But my main concern is the extemely rough idle and engine reaction to the heat. I was not able to duplicate this issue while I was at the dealer and was wondering if anyone also has this extreme issue; besides the normal throttle blip.

 

[markjenn]

If your complaint is only noticeable when "blipping" the throttle, I'd chalk it off to normal lean hesitation due to emissions tuning. If it does it in normal driving, I'd probably think you have an issue to be addressed. Regardless, I'd wait until you're out of break-in and have had the break-in service before making a final assessment.

- Mark

 

[ELP_JC]

Hey gang, was on vacation, but am back.

Glad to hear ALL of the new FJRs seem to run overly lean. I learned that FJRs and FZ1s are 'world' bikes, which means they're made to the stringest emissions, which currently are Euro3. These are much tougher than even CA right now.

That explains the overly lean running we're experiencing. Euro3 also calls for ALL FUEL cut off on decel, which means a really abrupt off/on throttle transition. Nothing we can do about that even with CO adjustments, but it's reduced with a richer mixture. Coming from a BMW, I'm an expert in throttle control, so I can live with the touchy throttle fine, but not stumbling, jerking, or surging.

I'm going to bump up the CO levels 4 for now, and see how the bike runs. THen will take it to the mountains and see what happens. I was going to wait until the mountains, but bike seems excessively lean, and don't like my motor running that hot in this 100+ degree heat. I figure with a 4 bump in CO it should be at CA levels, right? Why have it even leaner? Opinions welcome. Hope to make it to the mountains by Wednesday. Bike currently has 60 miles on the odo. Take care gang.

JC

 

[painman]

Do it right and use a dyno. PM. <><

 

[ELP_JC]

Do it right and use a dyno. PM. <><

And drill holes for the EGR??? Somebody already did, and I read of an '07 owner who got the best results with +7, so I just did that this afternoon. Will try it out in the morning, and towards the end of the week in the mountains, which will be the real test. Bumping 7 numbers the CO still meets CA emissions, so I don't have any problem with that mod. Plus it's reversible in a minute.
By the way, my stock CO numbers on my '07 (1/07 build date) were 5,18,18,21. Later.

JC