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| Jerks off and on acceleration; with video | |
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| Tweet Topic Started: Sep 23 2013, 01:55 AM (928 Views) | |
| 2000Firefly1.3L | Sep 23 2013, 01:55 AM Post #1 |
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video coming soon. recently dialed in my tps, and idle speed. problem has been occurring ever since i installed my transmission. for a process of elimination i drive it without the O2 sensor plugged once, no change. also in the vid i did one 'lap' without the tps plugged, other with it again no difference there. two out of the three engine mounts are urethane-filled. other one is stock. jerks the most under 2K rpm, on/off throttle and letting out the clutch. engine components are weighted and balanced, flywheel crank and pulley resurfaced/balanced transmission and clutch come out of my donor car (did a 5 speed swap) which was 1995 firefly 1.3L . i had inspected the clutch this spring and still within tolerance. this problem occurred on the donor car before but was exacerbated probly by a out of spec tps or iac . i have fixed most big problems in this car, now i'm moving onto the little ones that i have to solve. only thing i can think of it being the actual clutch pad and plate - but these show no obvious signs of wear. clutch does not slip. i installed it with the centering tool. opinions > |
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| HughJazz | Sep 23 2013, 06:13 AM Post #2 |
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i smell like fish
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LOL sometimes thread titles are hilarious! |
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| jonathan180iq | Sep 23 2013, 12:19 PM Post #3 |
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Not Really All That Smart
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Yes please!
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| 2000Firefly1.3L | Sep 23 2013, 10:26 PM Post #4 |
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here it is. 720p size http://www.youtube.com/watch?v=sMpbAGjI1aQ |
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| JADEDSL2 | Sep 23 2013, 10:43 PM Post #5 |
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Resident WraithSlayer
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Your trans makes a ridiculous amount of noise man. Honestly, we have the same powertrain, and I don't have the issue like you have. My engine has never been trouble. You said the problem has been occurring since the trans install. I would personally lean towards something being wrong with your trans. My .02 may not be worth much in this situation though.
Edited by JADEDSL2, Sep 23 2013, 10:46 PM.
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| Flash | Sep 23 2013, 10:55 PM Post #6 |
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53 mpg last trip
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Too much background noise: rain, wipers, AC on full. Hard to hear the motor. |
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| m4ick | Sep 26 2013, 09:20 AM Post #7 |
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Clutch spring? I know you checked them but that's all i can think of that would make the driveline "springy" like that.
Edited by m4ick, Sep 26 2013, 09:22 AM.
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| 2000Firefly1.3L | Sep 26 2013, 08:09 PM Post #8 |
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i didn't check my clutch spring - only the clutch pad thickness. i am unaware on how to check or measure the clutch springs. it is equally 'springy' with gas on/off between 2K and 2.5K rpm. |
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| 2000Firefly1.3L | Sep 26 2013, 08:15 PM Post #9 |
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after watching this youtube video i now understand the purpose of the clutch pad springs, and this could actually be the symptom. perhaps my symptom is behaviour of a defective unit, or all have this effect ? Edited by 2000Firefly1.3L, Sep 26 2013, 08:15 PM.
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| 2000Firefly1.3L | Sep 26 2013, 08:30 PM Post #10 |
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my clutch plate only has four springs. |
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| 2000Firefly1.3L | Oct 3 2013, 09:48 PM Post #11 |
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installed a new upstream O2 sensor today, BOSCH premium oxygen sensor #13500 . ain't cheap, but old one gave out a DTC this morning. we'll see if this has anything to do with some of my symptoms. |
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| JADEDSL2 | Oct 3 2013, 11:01 PM Post #12 |
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Resident WraithSlayer
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It could. An old sensor, even one that works, gets "lazy" and slow to react to the changes, which slows the signal to the PCM as well. Any new sensor is always better than an old one, even one working perfectly. |
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| 2000Firefly1.3L | Oct 4 2013, 10:31 PM Post #13 |
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Makes no difference. I can really feel the springy from the clutch springs though. |
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| 2000Firefly1.3L | Oct 16 2013, 11:09 PM Post #14 |
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well i can vouch that the new O2 sensor has made an improvement. not a complete fix but better. |
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| JADEDSL2 | Oct 16 2013, 11:16 PM Post #15 |
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Resident WraithSlayer
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Well better is better than no change. At least it's a start.
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At least it's a start.

2:18 PM Jul 11