| Author | Message | ||
     Helltaco |
Hello all, I'm trying to get a 99 X1 Carbon Fiber edition running in top condition again. I picked it up a few weeks ago, and it looks like it was well loved by the original owner and then neglected by the last guy. It had a Force intake and full exhaust, and the exhaust broke off at the muffler inlet. The PO continued riding it for a while with no muffler. Then the front head started ticking and he decided to sell it. I replaced the front lifters, put a stock exhaust back on, and generally tried to tidy it up. It started OK but bucked and popped like crazy from off idle to 3/4 throttle. Always runs great at WOT. I reset the TPS and had the same problem, so I went out and got a new TPS from Autozone (I saw in previous posts that a TPS from a 93 Ford Mustang 5.0 would work so that's what I got, it seems exactly the same as OEM), installed it, reset the TPS again, and took it out. Still has the same problem. Now I check the TPS reading in ECMSpy, and I notice that while the readings seem normal and smooth with the engine off, when the bike is running the TPS readings jump around a lot. At idle, the reading goes from 5% to 20% and it constantly jumping around. The TPS connection to the wiring harness seems clean and tight. Any ideas where I should go from here? | ||
| Natexlh1000 |
Have you inspected your throttle butterfly shaft? They have a tendency to break at the screw holes. Mine did at about 45-55 thousand miles. Back when I fixed mine, the throttle body assembly was under $100 and came with the TPS already on it. | ||
| Helltaco |
I was messing with the butterfly when I replaced the TPS and it seemed OK. It opened and closed normally when I twisted the throttle. If I had to guess I'd say it seems like a wiring issue. I think I just want to make sure there's not something I haven't thought of before I take the tank off and inspect everything again. | ||
| Natexlh1000 |
When the shaft goes, it's pretty damn obvious so if you gave it a visual and it checked out, then it's some other damn thing. Is it possible that the Ford part's little key doesn't line up the same as the Buell one? All the TPS is is a potentiometer (variable resistor) you can check it out with an ohm meter. | ||
| Firemanjim |
What was your AFR? And did you check your intake seals. Is TPS setting jumping at a steady idle? What exhaust are you running? | ||
| Jcs64 |
Brand new here, and Ill be following this one close since my "new to me" '00 X1 is doing the same thing as far as the way its running. I dont have any software or cable to see whats going on w/ the sensors yet, hopefully santa will come thru  Jeff | ||
| Helltaco |
I haven't checked the intake seals yet. I think AFR was right around 100, maybe 101. I'll check when I look into it again tomorrow. The idle is uneven, it surges a little bit. What it looks like, is that the TPS reading is bouncing around, and the ECM is therefore sending erratic amounts of gas, causing the engine to bounce back and forth from rich to lean and occasionally running OK just by coincidence. I put a stock exhaust on, header and muffler. I guess really my question is, if I'm watching ECMSpy and the TPS reading is bouncing all over the place no matter what the engine speed, is that most likely a problem with the TPS or it's wiring, or does that also happen with other problems like intake leaks, timing problems, bad grounds on sensors, etc.? Thanks for all the help. | ||
| Two_seasons |
Check to make sure your O2 sensor is working. Engine temp sensor too. | ||
| Rich |
Check your cam position sensor, too. They melt a little sometimes.  (Message edited by Rich on November 29, 2011) | ||
| Kalali |
I would check the TPS with the engine off (ignition on) and first check the reading with the throttle closed. It should read around 4.5-5.5%. Then slowly twist the throttle and see if the values increase smoothly up to 100% with the throttle fully open. If that looks good I think you can rule out the TPS (and the wiring) as potential culprits. | ||
| Helltaco |
I opened everything back up to take a closer look with all this stuff in mind, and the butterfly shaft is definitely broken. It didn't look like it because it still opened and closed fine, but the end that's attached to the TPS was broken so the TPS wasn't turning as much as the butterfly was. Thanks Nate. Can you still buy this part from the dealer? Or do I have to go digging around for a used one? | ||
| Jcs64 |
kinda funny you found this today. Just this morning I figured I would check mine too and found the butterfly ready to fall off! Both screws were backing out. Ill go for a test ride tomorrow and see if that was it, but it couldnt of been helping. Jeff | ||
| Firemanjim |
Somebody here was making them, if not I think Terry had his done at BC Gerollamy in Sacramento. | ||
| Natexlh1000 |
Try to get one from the dealer. They updated it by making the screws smaller, leaving more meat for the shaft. (Meaty shaft...... I won't say it) | ||
| Kalali |
Last time I checked you had to buy the TB assembly as a unit. A little over $120. Make sure you order the two seals; one between the nose cone and one between the TB and the intake, while you're at it. You'll most likely damage them during removal. | ||
| Natexlh1000 |
WD40 those seals and they pop together like buttah! | ||
| Helltaco |
Just wanted to follow up. I bought a used throttle body with the updated butterfly shaft (smaller screws than the original). After installing, resetting the TPS, getting it started and then taking it for a burn-in ride, everything is great. Thanks for the help. | ||
| Jcs64 |
thanks for updating, It sucks when you follow a post and never hear what works or dont. jeff |
