| Author | Message | ||
     Impala |
I have a 99 X1 which has a stumble at part throttle. I have EcmSpy and would like to see a map that someone has that is working well for them. I am running a K&N air filter, Race ECM and a D&D slip on pipe. No other modifications that I am aware of. It was lean with the stock ECM (surprise) but the race ECM has a stumble about 2000 rpm. Bike cruises fine without any hicups but if you short shift or wack the throttle at the lower RPM it will cough. TPS reset was no help. I bought the ECM used so I have no idea which revision it is. | ||
| Natexlh1000 |
Your problem isn't a problem. Downshift the bike and get on with your life.  | ||
| Mmmi_grad |
The reason other people say this didnt exist before I believe is because the factory timing was a little too far advanced. Giving a much crisper and immediate response. | ||
| Jos51700 |
Indicative of air intake seals leaking, and probably still non-ideal fuel mapping. So quick to blame the engine management, but you still need to verify the mechanical condition of the bike before diagnosing engine management. So, how are the intake seals, have you reset your timing, and what is your AFV? | ||
| Kalali |
I have a similar problem and was wondering where exactly are the "Intake Seals"? My intake is totally stock. Thanks. | ||
| Oldog |
the intake seals are on the inner faces of the cylinder heads around the intake manifold, they are held in place by an aluminum clamp around the manifold also you could have an air leak around the injectors 2 orings and a clip hold the injector assembley & fuel rail in place. | ||
| Kalali |
Thanks Oldog. | ||
| Oldog |
Your welcome BTW the "clip" I am refering to is on the intake manifold held by a screw you must also release clips on the injectors at the fuel rail assembly to remove them, when you have the tank off it will become obvious. | ||
| Jsimpkins |
First, I do not have a set of service manuals for my 02 X1. That being said, what should the timing be set to for idle and other RPM's? How do you change and or set the timing on a X1/XL engine? I can see the spark advance using VDSTS, but what should it be? Whats the best practice? I hate stumbles at low RPM, what can be done about that? Or is it just a function of a short stack and stroker engine? Also side note, I have for years had a cut out /stumble at highway speeds, found out that if I do a TPS reset and AFV reset at the same time it goes away. Latest results were that it came back at about 2500 miles, I did the routine again, and it went away. I did notice that the AFV value was 85.5. I think the issues is over leaning. Is there anyway to force the AFV to not exceed a min value, say 88 or 89? Is there anyway to map out that mid range to fatten the mixture up in the mid range? If so how? j- | ||
| Oldog |
JS Timing setting per FSM [ CONDENSED ] 1. Set front cylinder to TDC on compression stroke, (a mark is visible in the plugged hole right side base of cylinders) to align for tdc be sure that it is the front cylinder 2. remove rivited cover, loosen pickup mount plate to allow movement 3. connect volt meter to pins 3(+) or 7(-) on the grey plug, while still mated to ecm (from back) 4. move the timing plate until the reading changes to + 5 volts from about 0~1 volt this happens when the timing cup edge passes the sensor switching point 5. when set, snug screws then re assemble. This is the static timing set, } | ||
| Jsimpkins |
Oldog- Thanks. j- |
