Car dies randomly

**bjmsam** · 11-16-2011, 06:34 PM

My '94 TT has been cutting out recently. It usually happens within the first two miles of a cold start, though it has happened a few times when at full operating temperature 30 miles / minutes into a trip. Here's what it looks like when logging:

Code:

Normal deceleration:

Time	RPM	Knock	O2vF	O2vR	IPW	TPS	Trim 	Load	Timing	AirFlow	IDC	Boost
320.16	1500	0	0.00	0.00	0	10	100	8	19	31.45	0	-11.48
320.43	1500	0	0.00	0.00	0	10	100	8	19	31.45	0	-11.29
320.66	1500	0	0.00	0.00	0	10	100	8	19	31.45	0	-11.48
320.92	1500	0	0.00	0.00	0	10	100	8	19	37.74	0	-11.48
321.14	1469	0	0.00	0.00	0	10	100	9	19	37.74	0	-11.48
321.41	1469	0	0.00	0.00	0	10	100	9	19	31.45	0	-11.29
321.64	1469	0	0.00	0.00	0	10	100	9	19	31.45	0	-11.29
321.9	1469	0	0.00	0.00	0	13	100	9	18	37.74	0	-11.09
322.12	1469	0	0.00	0.00	0	15	100	12	18	44.03	0	-10.51

Easing back into the throttle:

Time	RPM	Knock	O2vF	O2vR	IPW	TPS	Trim 	Load	Timing	AirFlow	IDC	Boost
322.38	1438	0	0.00	0.00	1.536	16	80	13	18	50.32	2	-10.12
322.61	1438	0	0.00	0.00	1.792	18	101	20	24	62.9	2	-9.54
322.9	1469	0	0.04	0.04	2.304	18	108	22	28	69.19	3	-8.95
323.11	1438	0	0.06	0.06	2.304	18	113	23	28	69.19	3	-8.76
323.36	1406	0	0.06	0.08	1.792	18	119	13	27	56.61	2	-8.56
323.6	1438	0	0.02	0.02	1.792	19	80	12	28	37.74	2	-7.98

Here's where it cuts out.
TPS shows that I am modulating the throttle.
Load and Airflow suggest that MAF is working.
IPW suggests that ECU is calling for fuel.
O2v suggests that there is no combustion.
Trim values are odd.

Time	RPM	Knock	O2vF	O2vR	IPW	TPS	Trim 	Load	Timing	AirFlow	IDC	Boost
323.86	1406	0	0.00	0.00	1.28	19	80	8	28	37.74	1	-7.59
324.08	1375	0	0.00	0.00	1.536	19	80	9	27	31.45	2	-7.59
324.37	1375	0	0.00	0.00	1.28	21	80	9	27	44.03	1	-6.42
324.6	1375	0	0.00	0.00	1.536	30	80	11	27	37.74	2	-1.75
324.86	1344	0	0.00	0.00	1.28	40	80	21	27	50.32	1	-0.39
325.07	1313	0	0.00	0.00	2.048	47	80	13	27	37.74	2	0.00
325.35	1344	0	0.00	0.00	1.28	56	100	22	27	50.32	1	0.20
325.59	1344	0	0.00	0.00	1.792	65	100	13	27	37.74	2	0.20
325.87	1313	0	0.00	0.00	2.816	14	80	12	27	37.74	3	-6.81
326.09	1313	0	0.00	0.00	1.536	16	80	9	27	31.45	2	-7.98
326.36	1344	0	0.00	0.00	3.584	35	101	20	28	44.03	4	-0.58
326.59	1250	0	0.00	0.00	1.792	45	80	11	27	37.74	2	0.00
326.86	1344	0	0.00	0.00	2.56	14	102	14	26	44.03	3	-5.45
327.08	1313	0	0.00	0.00	1.792	15	80	11	27	37.74	2	-7.78
327.35	1344	0	0.00	0.00	2.56	38	102	15	28	44.03	3	-0.19
327.57	1250	0	0.00	0.00	1.792	44	80	12	26	69.19	2	0.00
327.85	1313	0	0.00	0.00	3.84	18	107	43	25	88.06	4	-4.09

Everything abruptly returns to normal:

Time	RPM	Knock	O2vF	O2vR	IPW	TPS	Trim 	Load	Timing	AirFlow	IDC	Boost
328.07	1406	0	0.04	0.04	2.816	15	114	28	28	75.48	3	-7.78
328.45	1375	0	0.76	0.06	5.12	32	122	53	21	150.96	6	-0.39
328.69	1375	0	0.82	0.80	5.12	37	114	62	20	157.25	6	-0.19
328.97	1406	0	0.74	0.70	5.12	38	105	64	20	169.83	6	0.20
329.19	1406	0	0.68	0.53	5.12	38	105	65	20	201.28	6	0.59

So I assume there is fuel but no spark. ProwlerGT's Sensor Review / Sputter and Hesitation Troubleshooting Guide is an excellent resource and I'm looking for suggestions on where to start. The O2 sensors, plugs, wires, coil packs and FP relay are all relatively new. I don't suspect the TPS since I'm seeing values in the log (and I don't suspect the ISC / IAC Servo since it happens off idle). Is the CAS a likely culprit? 2G ECUs don't suffer from leaky caps, right?

**bjmsam** · 11-17-2011, 05:07 PM

Today's log below. I didn't reformat the numbers this time since it's easier to see the problem this way (O2V should be 0 only when IPW is 0).

Code:

Time	RPM	Knock	O2vF	O2vR	IPW	TPS	Trim 	Load	Timing	AirFlow	ISC	IDC	Boost
230.78	1688	0	0.0585	0.078	1.536	15	80	13	31	56.61	55	2	-11.09
231.08	1688	0	0.0585	0.2535	1.536	15	80	13	31	56.61	55	2	-11.09
231.33	1688	0	0.0585	0.078	1.536	15	80	13	31	56.61	55	2	-11.09
231.61	1688	0	0.0585	0.078	1.536	15	80	13	31	56.61	55	2	-11.09
231.86	1688	0	0.0585	0.0975	1.536	15	80	13	31	56.61	55	2	-11.09
232.13	1719	0	0.0585	0.078	1.536	15	80	13	31	56.61	55	2	-11.09
232.39	1688	0	0.0585	0.078	1.536	15	80	13	31	56.61	60	2	-11.09
232.67	1719	0	0.0585	0.078	1.536	16	80	14	31	62.9	55	2	-10.9
232.91	1719	0	0.0585	0.0585	2.304	19	101	21	30	81.77	55	3	-9.73
233.19	1688	0	0.039	0.1755	2.56	19	109	24	30	88.06	55	4	-9.34
233.42	1719	0	0.819	0.8385	2.816	21	104	28	30	75.48	57	4	-8.17
233.71	1719	0	0.1755	0.156	2.816	21	104	29	30	81.77	57	4	-7.98
233.95	1719	0	0.117	0.0585	2.048	21	112	21	30	56.61	57	3	-7.78
234.24	1719	0	0.0195	0	2.048	22	80	11	31	44.03	57	3	-7.39
234.48	1719	0	0	0	1.28	14	80	9	31	31.45	55	2	-9.15
234.78	1688	0	0	0	1.28	13	80	9	20	31.45	55	2	-11.09
235.02	1656	0	0.0195	0.0195	0	13	100	8	20	37.74	55	0	-11.29
235.32	1656	0	0	0	0	15	100	9	20	31.45	57	0	-10.9
235.57	1656	0	0	0	0	26	80	14	30	50.32	64	0	-5.25
235.87	1625	0	0	0	1.28	41	80	8	30	31.45	73	2	-0.78
236.11	1625	0	0	0	2.816	45	102	13	30	44.03	72	4	-0.58
236.42	1625	0	0	0	1.28	13	80	9	30	37.74	55	2	-8.76
236.68	1625	0	0	0	1.28	14	80	9	30	31.45	58	2	-10.32
236.96	1594	0	0	0	4.864	40	102	45	25	163.54	73	6	-0.78
237.21	1563	0	0.0195	0.0195	4.608	14	119	47	26	106.93	65	6	-6.23
237.54	1656	0	0.9165	0.9165	2.048	13	115	23	29	75.48	55	3	-10.51
237.78	1625	0	0.897	0.897	1.792	16	109	14	30	69.19	59	2	-10.32
238.1	1656	0	0.2535	0.2925	5.12	34	103	55	24	207.57	71	7	-1.36
238.35	1656	0	0.741	0.429	4.864	38	100	63	22	226.44	72	7	-0.58
238.67	1656	0	0.0195	0.0195	1.792	43	113	21	30	56.61	73	2	0
239.03	1656	0	0	0	1.024	14	80	3	29	18.87	55	1	-7.98
239.33	1719	0	0.0195	0.0195	3.84	34	101	17	30	56.61	72	6	-1.36
239.6	1688	0	0	0	3.328	47	80	13	31	44.03	73	5	-0.19
239.91	1750	0	0	0	3.328	15	100	0	6	0	56	5	-7.39
240.16	1813	0	0.0195	0.039	1.28	36	80	8	31	25.16	74	2	-0.78
240.44	1781	0	0	0	10.496	49	100	0	7	0	54	16	0
240.67	1813	0	0.9555	0.9555	8.704	34	100	0	6	0	53	13	-0.97
240.96	1844	0	0.8775	0.4095	0	15	100	10	22	62.9	64	0	-7.59
241.21	1781	0	0	0	2.048	13	101	16	22	62.9	55	3	-10.51
241.54	1813	0	0.8775	0.9165	1.28	15	80	10	32	50.32	55	2	-11.29
241.81	1813	0	0.8385	0.78	3.584	26	101	31	32	125.8	65	5	-6.03
242.14	1875	0	0.702	0.2925	5.12	39	105	61	24	257.89	73	8	-0.58
242.4	1906	0	0.078	0.741	5.632	45	112	69	22	289.34	74	9	0.39
242.74	1969	0	0.6825	0.6825	5.888	49	98	75	21	320.79	73	10	1.56
243	2000	0	0.7995	0.156	3.328	16	99	49	27	144.67	70	6	-6.23
243.31	2031	0	0.9555	0.9555	1.792	13	89	15	33	62.9	55	3	-10.51
243.6	2031	0	0.936	0.936	1.28	13	80	8	33	44.03	55	2	-11.87
243.92	2031	0	0.8775	0.858	0	13	100	9	23	44.03	55	0	-11.87
244.18	2063	0	0.0195	0.0195	0	13	100	9	23	44.03	55	0	-12.07
244.52	2063	0	0	0	0	11	100	9	23	44.03	55	0	-12.07
244.78	2063	0	0	0	0	10	100	9	23	37.74	55	0	-12.07
245.07	2063	0	0	0	0	10	100	9	23	37.74	55	0	-12.07
245.32	2063	0	0	0	0	10	100	9	23	37.74	55	0	-12.26
245.62	2063	0	0	0	0	10	100	9	23	37.74	55	0	-12.07
245.87	2031	0	0	0	0	10	100	9	23	37.74	55	0	-12.26
246.18	2063	0	0	0	0	10	100	9	23	37.74	55	0	-12.07
246.43	2031	0	0	0	0	10	100	9	23	37.74	55	0	-12.07
246.72	2031	0	0	0	0	10	100	9	23	37.74	55	0	-12.07
246.97	2031	0	0	0	0	10	100	9	23	37.74	55	0	-12.07
247.26	2031	0	0	0	0	10	100	9	23	44.03	55	0	-12.07
247.52	2000	0	0	0	0	14	100	8	23	50.32	55	0	-11.68
247.83	2000	0	0	0	0	16	100	10	23	56.61	55	0	-11.29
248.08	2000	0	0	0	0	16	100	12	23	62.9	55	0	-10.9
248.38	2000	0	0	0	0	17	100	13	23	69.19	55	0	-10.51
248.65	1969	0	0	0	1.792	18	80	14	27	69.19	55	3	-10.51
248.97	1969	0	0.039	0.039	3.072	25	103	28	33	106.93	61	5	-7.39
249.22	1969	0	0.6435	0.8385	2.56	15	105	26	33	88.06	56	4	-9.54
249.53	2031	0	0.858	0.741	1.536	13	80	10	33	50.32	55	3	-11.68
249.78	1906	0	0.273	0.858	1.28	15	80	10	31	50.32	56	2	-11.09
250.29	1531	0	0.039	0.0585	3.84	25	108	36	29	132.09	78	5	-5.25
250.55	1594	0	0.8385	0.819	3.84	27	101	50	25	150.96	81	5	-2.92
250.86	1594	0	0.6825	0.078	4.352	33	104	59	22	207.57	82	6	-1.16
251.13	1594	0	0.039	0.117	4.864	33	118	61	22	207.57	83	6	-0.78
251.43	1594	0	0.0975	0.741	4.864	33	107	63	21	213.86	68	6	-0.58
251.8	1594	0	0.7605	0.195	5.12	33	109	64	21	220.15	68	7	-0.39
252.09	1625	0	0.1365	0.624	4.864	33	100	64	21	226.44	68	7	-0.19
252.35	1656	0	0.819	0.624	5.12	33	108	65	22	226.44	68	7	0
252.68	1656	0	0.702	0.663	4.864	30	99	62	23	213.86	66	7	-0.97
252.93	1656	0	0.8385	0.8385	3.584	25	92	51	25	144.67	63	5	-2.92
253.21	1656	0	0.8775	0.7605	3.84	22	82	46	26	132.09	60	5	-5.64
253.57	1656	0	0.9165	0.897	3.328	19	73	32	30	88.06	57	5	-8.17
253.86	1656	0	0.8775	0.7995	2.304	18	64	26	30	81.77	54	3	-9.15
254.1	1656	0	0.8775	0.2925	2.304	18	63	23	30	75.48	54	3	-9.54
254.39	1656	0	0.702	0.117	2.048	18	73	21	30	56.61	54	3	-9.54
254.65	1625	0	0.039	0.039	1.28	18	80	8	30	37.74	54	2	-9.54
254.97	1625	0	0	0	1.536	18	80	8	30	31.45	54	2	-9.34
255.22	1594	0	0	0	1.024	15	80	9	30	37.74	55	1	-10.32
255.54	1625	0	0	0.0195	1.28	32	80	9	30	31.45	68	2	-2.33
255.78	1625	0	0	0	3.84	35	80	16	30	50.32	72	5	-1.16
256.09	1594	0	0	0	1.28	48	80	8	30	31.45	74	2	-0.19
256.33	1594	0	0	0	2.304	49	103	13	30	44.03	73	3	-0.19
256.64	1563	0	0	0	1.28	36	80	9	30	69.19	72	2	-0.97
256.88	1563	0	0	0	1.792	45	80	11	30	37.74	73	2	-0.19
257.18	1563	0	0	0	1.28	14	80	10	29	44.03	70	2	-7.78
257.42	1563	0	0	0	2.048	14	80	13	30	50.32	64	3	-9.93
257.71	1531	0	0.0195	0.039	1.792	21	80	21	29	94.35	63	2	-7.98
257.98	1594	0	0.039	0.0975	5.12	38	106	58	22	201.28	73	7	-0.78
258.28	1531	0	0.234	0.078	5.376	50	113	66	21	220.15	74	7	0.39
258.54	1563	0	0.078	0.8385	5.376	49	113	68	20	232.73	74	7	0.59
258.85	1563	0	0.8385	0.429	3.072	49	112	50	25	100.64	74	4	0.98
259.09	1531	0	0.0195	0	4.096	43	124	48	26	100.64	72	5	0.39
259.4	1563	0	0	0	1.536	14	136	13	29	44.03	69	2	-7.78
259.66	1531	0	0	0	1.024	13	80	8	29	31.45	54	1	-9.93
259.93	1563	0	0	0	1.024	13	100	0	5	0	50	1	-10.9
260.17	1563	0	0.0195	0.039	0	15	100	5	20	18.87	54	0	-10.9
260.47	1563	0	0.039	0.0195	0	24	100	8	19	25.16	61	0	-6.03
260.72	1531	0	0	0	0	30	100	9	19	31.45	62	0	-2.14
261.03	1656	0	0.0195	0.039	0	31	100	6	20	18.87	71	0	-1.16
261.26	1469	0	0	0	0	38	100	8	19	25.16	71	0	-0.78
261.57	1531	0	0	0	1.536	14	80	17	29	69.19	68	2	-7.2
261.8	1500	0	0	0	1.792	13	80	11	32	44.03	54	2	-9.73
262.1	1531	0	0	0.0195	1.28	13	80	8	29	37.74	54	2	-10.9
262.35	1500	0	0	0.0195	0	13	100	8	19	31.45	54	0	-11.09
262.64	1500	0	0	0	0	13	100	9	19	44.03	54	0	-10.9
262.88	1500	0	0	0	1.28	24	80	9	21	31.45	65	2	-6.42
263.15	1500	0	0	0	1.28	31	80	9	29	31.45	68	2	-1.75
263.37	1469	0	0	0	0	35	100	9	19	0	67	0	-0.97
263.67	1563	0	0	0.0195	0	38	100	33	28	106.93	71	0	-0.58
263.91	1531	0	0.0195	0.0195	4.608	36	109	46	25	88.06	70	6	-0.58
264.2	1469	0	0	0	2.304	14	118	23	29	75.48	67	3	-7.39
264.44	1469	0	0.0195	0.0195	2.304	13	125	17	29	50.32	54	3	-9.93
264.72	1469	0	0.078	0.6825	1.28	13	80	12	29	44.03	54	2	-10.9
264.97	1469	0	0.039	0.039	1.536	13	80	11	29	37.74	54	2	-11.09
265.26	1469	0	0.039	0.039	1.792	22	80	20	28	94.35	63	2	-7.98
265.51	1531	0	0.039	0.039	2.304	31	105	26	28	69.19	71	3	-1.55
265.77	1500	0	0	0	3.84	40	112	48	24	138.38	72	5	-0.58
266.01	1469	0	0.0195	0.0195	4.608	26	122	53	23	132.09	70	6	-2.53
266.31	1500	0	0.8775	0.8385	3.072	14	119	35	28	75.48	62	4	-7.78
266.56	1500	0	0.936	0.936	2.304	13	115	25	29	75.48	54	3	-9.93

 ...

374.83	1438	0	0.0195	0.0195	3.072	15	116	32	28	81.77	70	4	-6.42
375.09	1438	0	0.039	0.0195	2.56	15	123	22	29	69.19	67	3	-8.95
375.33	1375	0	0.078	0.429	3.328	29	126	41	26	94.35	66	4	-3.11
375.64	1375	0	0.0585	0.0195	1.792	36	126	15	28	44.03	71	2	-0.78
375.89	1469	0	0	0	1.28	36	100	0	4	25.16	68	2	-0.97
376.2	1281	0	0.0195	0.0195	1.536	33	80	8	27	31.45	68	2	-0.97
376.46	1469	0	0	0	1.28	22	80	9	28	37.74	65	2	-4.47
376.76	1406	0	0	0	1.536	14	80	13	28	50.32	62	2	-8.76
377	1406	0	0	0	2.56	19	101	23	27	75.48	60	3	-8.17
377.3	1375	0	0.039	0.0585	3.328	25	109	41	26	106.93	64	4	-4.09
377.56	1375	0	0.7995	0.741	4.608	36	102	59	20	150.96	71	5	-0.78
377.87	1406	0	0.234	0.2535	4.864	36	111	63	20	163.54	71	6	-0.39
378.11	1406	0	0.7995	0.741	4.608	36	104	63	20	169.83	71	5	-0.39
378.4	1438	0	0.117	0.156	5.12	36	112	64	20	201.28	71	6	0
378.66	1469	0	0.624	0.819	4.864	36	109	65	20	207.57	71	6	0.2
378.97	1469	0	0.078	0.351	4.864	36	109	66	21	213.86	71	6	0.39
379.21	1500	0	0.7215	0.78	5.12	36	111	66	21	213.86	71	6	0.39
379.53	1531	0	0.2535	0.4485	5.12	36	107	67	21	220.15	71	7	0.59
379.79	1563	0	0.819	0.4485	5.632	42	112	70	20	239.02	73	7	1.37

**PharmEcis** · 11-17-2011, 06:02 PM

Jim,

As I stated in my email to you, the 94's don't use a CAS. They have seperate cam and crank sensors. It could be the power transistor failing and cutting spark. If you lost RPM signal I would say crank sensor, but that doesn't seem to be the case.

I'll see you Monday!

**rawavr4** · 11-17-2011, 06:28 PM

What gear was this in?

**bjmsam** · 11-17-2011, 09:46 PM

Originally Posted by PharmEcis

It could be the power transistor failing and cutting spark.

Sounds plausible considering the capacitor was not reconnected when the coil pack was replaced and it was run that way for a full year and thousands of miles.

Originally Posted by rawavr4

What gear was this in?

It usually happens in a high gear when cruising. It has happened once at idle and once in second gear (which was not a fun experience).

**Roybatty** · 11-23-2011, 05:46 PM

any updates to this? Curious to the fix.

**rawavr4** · 11-23-2011, 09:13 PM

Yes, i thought I posted it. My ground wire pin in the coil pack connector(engine harness side) was damaged and i was getting an intermittent ground which is why it shut off at random times. I replaced the pin with one I had from another connector and problem solved.

**rawavr4** · 11-23-2011, 09:14 PM

Well thats my fix, I dont know if you were talking about the other guys problem.

Thread: Car dies randomly

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