| Author | Message | ||
     Saturnsabian |
Hello all! I need some help brainstorming. I have a 2000 S3 that was in need of a tps reset. As I was zeroing the thottleplate, the remote adjuster snapped... I loosened the tank and moved it out of the way just enough to get the screw out. Replaced the ajuster, reset tps to 5.1% open and attempted to fire. I backfired out the exhaust and pop in the intake. Checked the obvious offenders - spark, injector pulse, fuel pressure, battery, fuses, grounds, wire harnesses, bypass side stand, intake leaks, compression, tps range thru ecmspy, etc. I cannot find anything that says "I'm the problem". I've been chasing this for about 2 weeks and Ive come up empty. I'm hoping someone can help. I understand the fuel injection and how it works but I'm baffled. Also, viewing the ecmspy data, all looks to be functioning as normal. For those who know what a distributor that is a 180 out or a few teeth out, that's what it sounds like while cranking. Plugs are wet... | ||
| Readyxb |
Did you have the backfiring and pop issues before attempting the TPS reset? | ||
| Harleyelf |
You sure it needed a TPS reset and not a CPS diagnostic? Random firing is a classic symptom of CPS failure. | ||
| Saturnsabian |
Thanks for the quick response! It ran okay prior but had a flat spot at about 35 mph and irratic idle at times; i thought there was an intake leak but could not find with wd40, propane, etc... so I figured I'd start with a tps rested since it wasn't done for years. That seemed to fix the gremlins with my X1. I was thinking the CPS may have gotten stupid but I have spark and injector drive. Plus toggling 0-5 on the ecmspy tab. I can't find any chafed wires or voltage anomalies at the CPS, either. It looks like the timing is still set to its original placement as there are no other marks on the plate from the attachment bolts. The HD dealers within 100 miles of me look at me like had 3 heads every time I say Buell. I've started just saying I have a 96 sportster so I can get gaskets if needed in a pinch. Is there a part number specific to the CPS and does anyone know the TPS part code used on these (looks like there are 3 available from ford). Thanks all. I appreciate the help! | ||
| Two_seasons |
Do another TPS reset. Make sure you "have the keys on" and set it again for approx 4.8 to 5.1 %. Make sure that when you roll from 0-100 that there are no flat spots in the entire range of travel. You will be able to see that. Are you sure your throttle cable isn't binding? | ||
| Saturnsabian |
Thanks. I'll try it again. I have heated grips so a possible slow pull throttle pull back may be an issue. I'll check it and report back. I'm going to pull the injectors out one more time and pressurize to see if there is a leaker - A fleeting thought on my way home today as I was mentally retracing my steps. | ||
| Two_seasons |
Had a Bueller over here about a year ago. No real power, sluggish mover. Turned out he had a leaking o-ring on an injector. About the TPS reset...allow for about a 10 minute at-idle relearn, then ride and keep below 3800 rpms (keeps bike in the closed-loop mode) and have some fun with it. | ||
| Firemanjim |
Did you make sure your throttle plate was closed completely-- you can feel the "stick" when you roll the throttle back on! And did the reset with Spy? Looking at the TP gauge and adjusting it back out? And try more than 5.1, some bikes don't like that little.Once the TP is reset properly that number is meaningless as long as bike idles well. | ||
| Preybird1 |
That sounds spot on jim. And i have done that on my bike and at my altitude its more 5.8-6.8 then my bike starts fine any less and just some pops and air pump sound these bikes make with no ignition. | ||
| Saturnsabian |
Hello again. I readjusted the tps again and tried higher tp opening setting and nothing worked. I swapped out the ecm, no luck. New CPS, still no start. I pulled the injectors and mocked up the setup outside the intake - no leaky injectors, good spray. I rechecked all the power feeds from the ignition switch, all good. Could the TPS gone bad? I get a slight voltage variance at closed throttle; toggles about .01 volts @ rest. | ||
| Steveford |
It's been so long since I've had one of those apart I'm not sure on the tube frames but on the XBs you can rotate the TPS a little bit to preload it when it wears. Doing that on my Useless cured the bucking and surging problems that finally resulted in a broken belt. Maybe look into doing that? | ||
| Saturnsabian |
I'll try that once I'm able to get it started. I can't get it to run as of yet. I'm stumped. | ||
| Kalali |
A slight fluctuation in the TP % or voltage is normal especially if the setting is on the border of two adjacent values. It looks like you've ruled out all the possibilities. At this point I'd visually make sure the throttle plate moves freely and is fully closed at the zero reset. If the TP sensor values increase linearly as you open the throttle, it is probably ok. You might have broken a wire inside the insulator as you tugged on various components. (Message edited by kalali on June 22, 2015) | ||
| Two_seasons |
"You might have broken a wire inside the insulator as you tugged on various components." That happened to me on my 2000 X1. If you run your thumb and finger along the insulation, you feel it when the wire is broken inside. | ||
| Ltbuell |
..do a wiggle test while running....and while at idle.Move along the harness and move the harness,connection points,ground points while having a meter hooked up.Try doing same thing with "key on,engine off" as well.Definitely check powers and grounds(possible corrosion between ground tabs and contact points).Any slight power drop will have an effect.Just my .02 cents worth.LT | ||
| Kalali |
By the way, you need to rule out fuses and relays as well. Those could fail without any notice. Keep us posted. | ||
| Firemanjim |
And the plugs have good spark and are not fouled?---Just read they are wet-- toss em!New plugs are in order. If you have compression, spark, and fuel it should run. | ||
| Buelldualsport |
FiremanJim You have a PM | ||
| Saturnsabian |
Two Seasons, what wire(s) did you find broken? I haven't been able to find any as of yet. Firemanjim - I've put 6 plugs in it already, all get wet... | ||
| Steveford |
When you did your TPS reset, was the bike cold, did you have maximum slop in the cables, did you snap the throttle open/closed 3X, hold the throttle fully shut, back off the adjuster cable until the voltage stopped going down and then did one full turn out on the adjuster and THEN hit Reset TPS, Reset AFV? If not, try doing it that way. | ||
| Kalali |
Don't mean to start a debate but based on my experience you can reset the TPS with the engine cold but need to adjust the idle later when the bike is warm. In your case, do what Steve suggested, especially the visual inspection of the throttle plate and if none of this works, I would suspect something is wrong with the fuel maps. Try an older map and see what happens. Do your head temperature and inlet air temperature readings match on ECMSpy? (Message edited by kalali on June 26, 2015) | ||
| Firemanjim |
If plugs are wet---something is up And you pulled the plugs and made sure you have good spark at each? And does each cylinder still have good compression. If you have spark, fuel, and compression it should do something---have you tried starting fluid? | ||
| Saturnsabian |
Sorry for the delay. I pulled off of this to work on leaking intake seals on my X1. I have still have not been able to find any broken or pulled wires. I'm not sure how mapping would have been affected. One thing I did notice, the TPS was changing while cranking. I duplicated it once. The throttle plate has no slack and the cables have not been adjusted. Both IAT and Head Temp match when trying to start. No codes, still. Driving me nuts... | ||
| Saturnsabian |
Trying to resurrect this feed. It's been a year now that this S3 has been down. I have gone over every inch of wiring, switches, electronics, etc and cannot get it to start. Does anyone have mapping for this where I can compare values? I've tried swapping the ECM and resetting the TPS, but have the same problem. | ||
| 96s2t |
Did you ever get the S3 running? |
