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| stumbles for some reason? (Page 3/4) |
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Xenoblast
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SEP 03, 01:27 PM
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| quote | Originally posted by katie80:
I'll start replacing ignition components if this video doesn't help with anything.
https://youtu.be/MjsGA54mvT4
I just took this, it lurches when I let off the throttle while I'm cruising. it started doing it at low speeds too.
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atleast for the v6's, the icm is what controls the tachometer. if the tachometer glitches like that i would think it would be the icm having problems. make sure it has a good ground, clean the mounting screws, clean the mating surface to the distributer housing, put computer thermal paste there.
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Patrick
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SEP 03, 01:43 PM
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| quote | Originally posted by katie80:
I'll start replacing ignition components if this video doesn't help with anything.
I just took this, it lurches when I let off the throttle while I'm cruising. it started doing it at low speeds too.
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Are you able to retrieve any Trouble Codes after the CEL flashes like that?
Similar to what Xenoblast has stated...
Occasionally when an ICM "fails", it's actually just a poor connection. Take off the distributor cap, unplug the pickup coil from the ICM, clean the connections, apply dielectric grease, and re-connect. Do the same with the external connections to the ICM and to the ignition coil.
Spoon brought up some good points Here as well.
If none of that resolves the issue, and no other faults can be found, replace the ICM and pickup coil. Make sure to use proper heat sink compound between the ICM and the base of the distributor.[This message has been edited by Patrick (edited 09-03-2021).]
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katie80
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SEP 03, 03:03 PM
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katie80
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SEP 03, 03:09 PM
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| quote | Originally posted by Patrick:
Are you able to retrieve any Trouble Codes after the CEL flashes like that?
Similar to what Xenoblast has stated...
Occasionally when an ICM "fails", it's actually just a poor connection. Take off the distributor cap, unplug the pickup coil from the ICM, clean the connections, apply dielectric grease, and re-connect. Do the same with the external connections to the ICM and to the ignition coil.
Spoon brought up some good points Here as well.
If none of that resolves the issue, and no other faults can be found, replace the ICM and pickup coil. Make sure to use proper heat sink compound between the ICM and the base of the distributor.
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I don't get any codes. I checked the pickup coil resistance, it was around 950 ohms. I cleaned the connections on the ICM and the issue still persists. I have a feeling it isn't an electronic component, since the issue stops as soon as the transmission is either not in gear or in neutral. Honesty I might take it to a shop at this point. this might be beyond me. I think I'll check fuel pressure again (I swear to god if I have to replace the fuel pump or something I'll drive this car off a cliff.)
edit: I still haven't tried revving it and messing with wires yet so I will try that when I get the chance.[This message has been edited by katie80 (edited 09-03-2021).]
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Patrick
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SEP 03, 03:52 PM
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| quote | Originally posted by katie80:
I have a feeling it isn't an electronic component, since the issue stops as soon as the transmission is either not in gear or in neutral.
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When the transmission is taken out of gear, the engine shifts position somewhat. I suspect (similar to Spoon's suspicion) that your issue is a poor electrical connection of some sort which is possibly cutting power to the ignition... or maybe even to the fuel pump.
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katie80
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SEP 03, 04:10 PM
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| quote | Originally posted by Patrick:
When the transmission is taken out of gear, the engine shifts position somewhat. I suspect (similar to Spoon's suspicion) that your issue is a poor electrical connection of some sort which is possibly cutting power to the ignition... or maybe even to the fuel pump. |
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it's possible, I meant I don't think it's a bad sensor. could certainly be wiring. I'll try and diagnose it tomorrow or Sunday.
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katie80
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SEP 04, 03:37 PM
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| quote | Originally posted by Patrick:
Are you able to retrieve any Trouble Codes after the CEL flashes like that?
Similar to what Xenoblast has stated...
Occasionally when an ICM "fails", it's actually just a poor connection. Take off the distributor cap, unplug the pickup coil from the ICM, clean the connections, apply dielectric grease, and re-connect. Do the same with the external connections to the ICM and to the ignition coil.
Spoon brought up some good points Here as well.
If none of that resolves the issue, and no other faults can be found, replace the ICM and pickup coil. Make sure to use proper heat sink compound between the ICM and the base of the distributor.
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https://youtu.be/XHke4Ee0dlU
I had my partner hold the revs up to pull on wires but it immediately started doing it again, no wires were being moved at all. I drove on the route I've been driving to test it and it didn't do it at all till I got back onto my street (up to temp + 15 mins of driving). it didn't do it til I was trying to accelerate in 2nd gear again, like the other video. the shift light was also blinking? is my ECM bad maybe? I wasn't in gear or moving.
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Patrick
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SEP 04, 04:28 PM
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| quote | Originally posted by katie80:
the shift light was also blinking? I wasn't in gear or moving.
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Hmmm... I find it very strange that the Shift light is also blinking while this issue is occurring, especially when the engine is not in gear.  That might mean something to someone who understands the Shift light/ECM programming better than me.
Does the Shift light work normally when the engine is running properly?[This message has been edited by Patrick (edited 09-04-2021).]
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katie80
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SEP 04, 04:57 PM
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| quote | Originally posted by Patrick:
Hmmm... I find it very strange that the Shift light is also blinking while this issue is occurring, especially when the engine is not in gear. That might mean something to someone who understands the Shift light/ECM programming better than me.
Does the Shift light work normally when the engine is running properly?
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yes the shift light works just fine normally. it didn't seem to work the other day when it was freaking out in 2nd gear. I got to like 3k at half throttle and the shift light didn't come on.
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katie80
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SEP 16, 12:48 AM
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incase anybody else has this issue, replacing the ICM completely fixed the issue.
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