| Author |
Message |
    
Mstrfrz
| | Posted on Wednesday, August 03, 2011 - 10:09 am: | 
|
99 X1, race ecm, V&H muffler. K&N filter. 36k miles.
Rear cylinder misses. VERY noticeable at low speeds/rpm under a load. New plugs, wires, and coil didn't help. Changing the ecm didn't help. Swapping injectors didn't change anything. Fixed an intake leak but no change. HELP!!!! |
Kalali
| | Posted on Wednesday, August 03, 2011 - 11:29 am: |
|
Remove and clean all the grounds and see if that helps. The two locations are the junction box below the seat next to the oil tank and the other is where the rear hugger mounts to the swing arm pivot area. |
Reepicheep
| | Posted on Wednesday, August 03, 2011 - 12:02 pm: |
|
Do the 99 X1's have a head temp sensor? |
Mstrfrz
| | Posted on Wednesday, August 03, 2011 - 01:18 pm: |
|
Yes, there's a temp sensor on the rear cylinder. Don't know about the front. The front cylinder runs like a champ.
Tossed the hugger fender ages ago... Why would a bad ground affect one cylinder and not the other? Will clean them tonite, though: it couldn't hurt. |
Reepicheep
| | Posted on Wednesday, August 03, 2011 - 01:33 pm: |
|
I'd make sure that temp sensor is working then. Maybe not the problem, but an easy test. |
Mstrfrz
| | Posted on Wednesday, August 03, 2011 - 06:19 pm: |
|
How easy? |
Harleyelf
| | Posted on Wednesday, August 03, 2011 - 07:19 pm: |
|
Temp sensor wouldn't make just one misfire. Cam position sensor might. Skips several impulses, fires.... might have forgotten how to count. Mine failed on my '99 S3 and was all kinds of grief to diagnose as it fired erratically. |
Mstrfrz
| | Posted on Thursday, August 04, 2011 - 06:38 am: |
|
How do I check that? |
Harleyelf
| | Posted on Thursday, August 04, 2011 - 07:30 am: |
|
First, unplug the 3-wire connector near the battery and check for shorts between them on the sensor side. Then see if the red pin on the module side has 12 volts with the key and kill switch on. Briefly short the two non-red wires on the module side together with the key on and check for spark. If spark is good and no shorts exist, drill the rivets out of the timing cover plate and unscrew the plate under it and sniff for burnt smell. After that, it's replace and re-try. |
Reepicheep
| | Posted on Thursday, August 04, 2011 - 08:50 am: |
|
The X1 doesn't have some kind of skip spark mode when it thinks it is too hot?
Cam position sensor is another great suggestion. |
Kalali
| | Posted on Thursday, August 04, 2011 - 11:10 am: |
|
"The X1 doesn't have some kind of skip spark mode when it thinks it is too hot? "
Yes it does but it only "skips" not stop.
As for the bad ground, the problem is the symptoms of a "bad" ground are unpredictable and can can range from dimming headlights to poor signal from ECM.
(Message edited by kalali on August 04, 2011) |
Mstrfrz
| | Posted on Thursday, August 04, 2011 - 01:55 pm: |
|
Ok, sounds like some work ahead. How much is a cam sensor going for? |
Harleyelf
| | Posted on Thursday, August 04, 2011 - 07:02 pm: |
|
A dual fire sensor, which will not work with your module, can be had online for $40 - you will have to go to the dealer and pay. Have you cleaned the battery ground strap where it bolts to the frame? The sensor will be much less than the ECM you already bought. |
Mstrfrz
| | Posted on Friday, August 05, 2011 - 01:19 pm: |
|
Dual-fire sensor? I take it that is different than what I have now? So $40 for a sensor: how much for a compatible module? And I'll have to go back to the stock ecm? |
Harleyelf
| | Posted on Saturday, August 06, 2011 - 08:55 am: |
|
The sensor for the fuel injected ecm modules (both stock and race) has a rotating trigger rotor with five or six slots in it instead of the two used with carburetor type modules. It fires once per revolution and the other slots are for steps in the fuel injection process. If you want to use the cheap sensor you have to ditch the fuel injection. I did just that and have been very happy with the results. Also changed the coil for a dual fire model, plugged the fuel pump holes in the gas tank with bolts and flat nylon washers, drilled a new hole for the petcock, and installed a Sportster intake manifold with a rebuilt SU carburetor. I found a good M2 module on flea bay but an XL one will work just as well. |
Mstrfrz
| | Posted on Saturday, August 06, 2011 - 09:47 am: |
|
Wow. Lots of good info. I like the FI. Apart from the ECM, I've not really needed and more performance mods. I really just want to get back to riding!
So far, the consensus seems to be the cam sensor. The breather reroute sounds like something I should do anyway. I'll update once I've done some cam sensor tests. |
Two_seasons
| | Posted on Sunday, August 07, 2011 - 04:26 am: |
|
Did you read out your DTC's? Diagnostic Trouble Code
Here is a way to check that...
http://www.badweatherbikers.com/buell/messages/476 23/644657.html?1312676648
Look for my posting on Saturday, August 6th @ 8:08pm for details on how to check your codes if you have any. |
Mstrfrz
| | Posted on Sunday, August 07, 2011 - 09:37 am: |
|
NICE! THIS is what I was looking for! Out of town right now, but will check the codes ASAP! |
Mstrfrz
| | Posted on Friday, August 12, 2011 - 01:14 pm: |
|
OK... Made a fancy jumper wire and everything, even lost the rubber plug for 20 minutes. Got the light flashing: code 13. What is 13?!?! |
Terrys1980
| | Posted on Friday, August 12, 2011 - 01:24 pm: |
|
O2 sensor
Turn ignition OFF and reconnect oxygen sensor. Turn ignition
ON and start engine. Allow engine to reach operating temperature.
Does voltage quickly fluctuate between 0.1-0.8 volts? Or does it stay around 0.5 volts?
(Message edited by TerryS1980 on August 12, 2011) |
Mstrfrz
| | Posted on Friday, August 12, 2011 - 02:46 pm: |
|
Voltage where? |
Terrys1980
| | Posted on Friday, August 12, 2011 - 03:12 pm: |
|
O2 sensor voltage |
Mstrfrz
| | Posted on Saturday, August 13, 2011 - 10:42 am: |
|
0.66-0.68VDC. An O2 sensor wouldn't cause the rear to miss, though... |
Terrys1980
| | Posted on Saturday, August 13, 2011 - 11:38 am: |
|
Be sure you are checking for codes properly.
Even though you have an X1 you can still use the '03 or '05 service manual, which are available for download, as the process of troubleshooting is the same.
Usually a misfire is caused by either coil, plugs or wires but can be a combination of other things.
Here is a short list of other things.
Starts But Runs Irregularly or Misses
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and shorting.
3. Spark plug gap too close or too wide.
4. Ignition coil not functioning.
5. Ignition module not functioning.
6. Ignition sensor not functioning.
7. Battery nearly discharged.
8. Damaged wire or loose connection at battery terminals
or coil.
9. Intermittent short circuit due to damaged wire insulation.
10. Water or dirt in fuel system and throttle body or filter.
11. Vapor vent valve plugged.
12. Throttle controls improperly adjusted.
13. Air leak at intake manifold or air filter.
14. Damaged intake or exhaust valve.
15. Weak or broken valve springs.
16. Incorrect valve timing.
17. Oxygen, IAT or ET sensors damaged or malfunctioning.
See dealer.
18. TP Sensor not set properly. See dealer.
19. Fuel level too low. Add gasoline.
20. Inoperative fuel injector. See dealer.
21. Obstructed fuel tank vent valve or pinched vent tube.
See dealer.} |
Mstrfrz
| | Posted on Saturday, August 13, 2011 - 02:52 pm: |
|
Ignition module? Where is it and how do I test/check it? The rest of the ignition system is new (coils, wires, plugs). Only the REAR cylinder misses.
Where can I download a service manual? I have a 99 manual for an S1, which hasn't been helpful in this case. |
Terrys1980
| | Posted on Saturday, August 13, 2011 - 03:05 pm: |
|
I am pretty sure that is referring to the ECM as it controls the ignition coil. |
Mstrfrz
| | Posted on Saturday, August 13, 2011 - 03:11 pm: |
|
If that is the case, then that is not the problem, as the miss occurs even when I change the ECM. That brings us back to the cam sensor... It's really the only thing I haven't been able to swap out yet. I've really gone over the wiring and can find no evidence of a short or broken wire. The problem doesn't get worse when it's all wet either. |
Terrys1980
| | Posted on Saturday, August 13, 2011 - 03:23 pm: |
|
Yea the cam sensor is about all that's left. |
Two_seasons
| | Posted on Saturday, August 13, 2011 - 11:49 pm: |
|
Make sure that you check that connector for the O2 sensor.
Make sure all the wires (sockets and pins on each side) that go into the connector are in all the way. It sometimes happens that while checking wiring, you inadvertently pull a wire out of the connector that isn't properly locked (secured) at the pin/socket.
P.S. sorry for the error in the codes with the link above. I've corrected it in the thread, but could not edit the post. |
Mstrfrz
| | Posted on Wednesday, August 17, 2011 - 01:39 am: |
|
Picking up a cam sensor Friday. I hope that fixes it, otherwise I'll have a spare. Anybody need a coil? 1/2 price! |
Troubleshooting (Poor Starting/Running/Handling/Ride Issues) »
Archive through November 06, 2011 »
HELP!! HELP!! Rear cylinder misses »
Archive through August 17, 2011