Stumble, stall, hard starting... TBS?

[chivvalry]

Something is still wrong. She's smoother, idles better... But stalled her pulling out of the driveway (almost dropped her) and, though I was trying to convince myself that was operator error since she seemed better behaved, when I pulled in to work she stalled again. Restarted her and she stalled out almost immediately. Turned the key off and came inside. Idle is between 950-1000 and screw is full clockwise.

Carb tuner gets here Monday and I will try the TBS. Hope she doesn't let me down between now and then.

 

[Hornet Pilot]

I had a some what similar problem when my Power Commander 3 was failing. If you have a PC installed you might try disconnecting it and configuring the bike cables like OEM and see if that helps. The PC folks confirmed that my unit had gone bad and replaced it. Anyway, good luck!

 

[chivvalry]

Hmm... I do. Okay, that gives me something to do while I wait on the carb tuner as well. I didn't install the PC so I will have to figure out how to back it out.

 

[ionbeam]

Hmm... I do. Okay, that gives me something to do while I wait on the carb tuner as well. I didn't install the PC so I will have to figure out how to back it out.

Under the tank, at the fuel injector, unplug the PC connector from the FJR harness, unplug the PC connector from the fuel injector; plug the FJR harness connector onto the fuel injector. Repeat for all cylinders. Plug the O2 sensor connector back together (you can run your FJR without doing this to determine if the PC is causing your problems, it will run just fine without the O2 sensor being plugged in).

 

[chivvalry]

Okay, only one big plug under there for the PCIII... appears to handle all cylinders. Couldn't locate the O2 sensor in the time allotted as I was being rushed by someone who thought I had to come to dinner and then take the dog to the vet. Buttoned her back up and she started no problem at all as many times as I wanted with no stalls or stumbles.

Rode to work this morning and I'm feeling low acceleration surging... However, NO stalls, NO hesitant/hard starts, NO stumbling. If she continues to behave at lunch and this afternoon then if I can get the time I will open her back up this evening and plug in the O2 sensor. (Alternatively I am considering replugging the PCIII and seeing if the problems return.)

I guess maybe I need to call about getting a new PCIII...? Since I'm not the original owner of the bike (it had around 1700 miles on it when I bought it) and didn't purchase the PCIII do you think they will help me out with a replacement or am I going to be screwed?

 

[Mihalis fjr]

Replugg the PCIII again and check carefully the black negative wire of the PCIII if it is in good condition!This black wire can cause all these troubles if it has cropped somewhere..!To confirm it better,start the engine with the wire in the battery,and start again the engine without the wire in the battery terminal.With this trick you will see if is is somewhere cropped inside and you can't see it where..

 

[chivvalry]

Replugg the PCIII again and check carefully the black negative wire of the PCIII if it is in good condition!This black wire can cause all these troubles if it has cropped somewhere..!

Ευχαριστώ I did inspect the PCIII wiring... the plug wiring as well as the wiring all the way to the battery... and they all looked good. Not saying there might not be a bad wire... but without breaking out a multimeter and checking resistances... it looked good.

 

[Mihalis fjr]

Well,if the negative wire is sure in good condition,and when you replugg the PCIII and the trouble continue,probably the PCIII has a problem..Not sure,my opinion...

 

[chivvalry]

Well,if the negative wire is sure in good condition,and when you replugg the PCIII and the trouble continue,probably the PCIII has a problem..Not sure,my opinion...

Can't hurt to do a little more experimentation! Probably won't get to it tonight though.

 

[Intech]

Ken,

If they stand behind their product it shouldn't matter about who bought it. You don't, necessarily, have to tell them that you didn't buy!

 

[chivvalry]

Ken,If they stand behind their product it shouldn't matter about who bought it. You don't, necessarily, have to tell them that you didn't buy!

Ha, good point! Bike is running fine now with the PCIII disconnected. Didn't get a chance to experiment with hooking it back up last night but I hope to have some wrench time this weekend to test it out once more. Also my carb tuner showed up (wasnt expecting that until Monday!) so even though there is no obvious need I will perform the TBS just so I can say it's done. I'll likely do the RDCUA TBS as well... just cause I can.

I'm getting real good at yanking my tank.

 

[chivvalry]

mmm`k.... in the garage right now...

went to reconnect the o2 sensor and discovered that it was, and always has been it seems, still connected. Hmm, says I. SO, I hooked the PCIII back up, disconnected the o2 sensor and while under there calibrated my brand new sync pro carb tuner and then did the TBS. I also did the RDCUA TBS.

Going to button her back up with the PCIII connected and o2 sensor disconnected and see how she behaves. Ill try and get a quick ride in tomorrow.

I know... riveting, right?

 

[Niehart]

I know... riveting, right?

Actually it is. Kind of like your a test pilot for a problem fix.

 

[chivvalry]

Note to the unwary... or slow like me... it`s a little WARM under there trying to get the little rubber caps back on the vacuum takeoffs if you dont bother waiting for the engine to cool down after doing the TBS followed by the RDCUA TBS. Had to disconnect and reconnect some of those stupid big black exhaust recirculating hoses (I think thats what they are) to get to the vacuum nipples.

Those little itsy bitty tiny clips on the rubber caps are just decoration, right? `cause one of them vanished...

 

[chivvalry]

The shot of bourbon I took right before going up to take a shower may be the genesis of this idea... But I wonder if they reconnected the o2 sensor when they did the recall....?

 

[Donal]

Note to the unwary... or slow like me... it`s a little WARM under there trying to get the little rubber caps back on the vacuum takeoffs if you dont bother waiting for the engine to cool down after doing the TBS followed by the RDCUA TBS. Had to disconnect and reconnect some of those stupid big black exhaust recirculating hoses (I think thats what they are) to get to the vacuum nipples.
Those little itsy bitty tiny clips on the rubber caps are just decoration, right? `cause one of them vanished...

Not much use to you now but.............. I always attach a short length of brightly coloured wire to those clips before attempting to remove them. Makes them much easier to find when they go walkabout...........

 

[Intech]

Note to the unwary... or slow like me... it`s a little WARM under there trying to get the little rubber caps back on the vacuum takeoffs if you dont bother waiting for the engine to cool down after doing the TBS followed by the RDCUA TBS. Had to disconnect and reconnect some of those stupid big black exhaust recirculating hoses (I think thats what they are) to get to the vacuum nipples.
Those little itsy bitty tiny clips on the rubber caps are just decoration, right? `cause one of them vanished...

Not much use to you now but.............. I always attach a short length of brightly coloured wire to those clips before attempting to remove them. Makes them much easier to find when they go walkabout...........

Even better, get some good quality hose and take those caps off and make a little manifold. Then the caps are larger and much easier to access. Mine come over by the #1 cylinder side. Takes a lot of time off the TBS procedure.

 

[chivvalry]

I actually looked around for some wire small enough to tie off those clips but didn't have anything...

The manifold idea is inspired.

Once I wake up a bit I'm going to run her around the block and see how she feels/behaves.

I'm a little surprised no one has laughed at me for doing the normal TBS and the RDCUA TBS since the second defeats the first...

 

[Fred W]

Best solution for those little clips is to throw them as far as you can and never worry about them again. Those are vacuum caps. What possible good can the clips serve when the vacuum is trying to suck the caps in?

And before someone mentions a vacuum cap being blown off of their 1975 Triumph Bonneville (or some such) back in the day, when was the last time you heard your FJR backfire?

 

[chivvalry]

Test ride done. Stalled pulling out of driveway and stalled again when I stopped in a parking lot... At this point I am calling it a bad PCIII. Figuring out how to get the PCIII out of there is going to be tricky. Why the hell wouldn't they think to put a nice thin, skinny connector where the wire bundle meets the actual PCIII box?? Would make running the wires a helluva lot easier.

Hmmm... Does anyone know if they have some sort of special diagnostic program before I partially disassemble the subframe to get it out?