Ever seen a log of bad caps?

[tpi_roc]

Would you say these swinging sensor inputs are from voltage instability of the capacitors?

Time	AirTemp	Baro	BattV	CoolT	RPM	TPS	Timing Advance (°)
0	50	1.1	11.63	45	0	9.8	5
0.45	43	1.02	11.41	60	0	9.8	5
0.91	28	1	12.88	37	0	9.41	5
1.36	43	0.9	11.56	45	0	10.59	5
1.81	50	0.97	11.56	52	0	9.8	5
2.26	39	0.92	12.88	46	0	10.2	5
2.71	28	1	11.41	52	0	10.2	5
3.17	35	0.91	11.41	50	0	9.02	5
3.62	28	0.97	12.88	46	0	10.2	5
4.07	35	1	11.56	37	0	9.8	5
4.52	35	1	11.41	45	0	9.8	5
4.98	43	0.9	11.93	45	0	9.41	5
5.43	49	0.92	11.49	60	0	10.59	5
5.88	43	0.9	11.49	48	0	9.8	5
6.33	17	0.97	11.41	48	0	9.02	5
6.79	19	1.02	12.95	37	0	10.2	5
7.24	19	0.97	11.93	37	0	9.02	5
7.69	50	1	13.46	48	0	9.02	5
8.14	50	0.91	13.46	45	0	9.8	5
8.6	28	0.97	11.56	50	0	10.59	5
9.05	43	0.92	11.93	50	0	10.59	5
9.5	43	1.02	11.41	52	0	9.02	5
9.95	43	0.9	12.88	50	0	9.8	5
10.41	46	0.92	11.41	37	0	10.59	5
10.86	46	0.97	12.95	52	0	9.02	5
11.31	50	1.09	11.93	50	0	9.02	5
11.76	35	0.92	12.88	50	0	10.98	5
12.22	28	0.92	12.95	52	0	9.02	5

 

[tpi_roc]

Nobody?

 

[bling5tatus]

0 rpms is a REALLY low idle... hahaha...

Hey, you know, there is one way to find out... you could take the ecu out and look at it.

 

[ArticNemesis]

0 rpms is a REALLY low idle... hahaha...

Or, he could be logging with the key in the on position, to show the variation in sensor inputs.

As stated, it wouldn't hurt to pull the ECU and look at it. (not really sure if failing capacitors would do this.)

Check your battery/harness grounds as well, bad grounds have a way of messing with automotive electrical systems.

 

[tpi_roc]

Or, he could be logging with the key in the on position, to show the variation in sensor inputs.

Thank you

Check your battery/harness grounds as well, bad grounds have a way of messing with automotive electrical systems.

Good idea, I'll take a look at the grounds if I get the same results after I solder in the new capacitors. I already knew they were leaking but the new ones are a week out in shipping and I wanted to see if my logs coincided with anybody else that had bad caps or If i'll have more problems when I'm done rebuilding the ECU.

We'll see on monday

 

[tpi_roc]

Caps came early

I replaced all 3 capacitors and the job went smooth. The board wasn't harmed and the original caps weren't bad. Went straight to logging and the problem still exists.

I then checked grounds, I checked the voltage at the batt with the ignition on, and also with the car running. I checked the power feeds in the ecm harness at the plug end. Voltages everywhere are stable but through a logger the data is all over the place.

If you notice the logs the sporadic sensor values do not follow the battery fluctuations in either direction, every value is completely random so I don't think its a power source issue.

Does anybody have any new ideas?