more EGT Sensor problems..

[Mikey-S]

I've recently fitted a bank 1 EGT sensor due to a permanent short to ground fault code. After that the car was fine to drive with no flat spots etc.

I've been out for a blast today and it seemed to have flat spots again, so I've done a fault code check and found 2 faults:

EGT sensor 1 implausable signal: intermittent.
EGT sensor 2 short to ground: intermittent.

I guess the bank 2 sensor may have now failed, but can anyone help with a reason for the new bank 1 sensor giving out an implausable signal??

Help much appreciated!

Mike

[Doug_S2]

if you log it it might read under 945 and that is the implausable signal. If you have replaced a sensor and you are getting the codes again you have something else wrong.

[Mikey-S]

Thanks Doug, but you lost me!! Can you explain the 945 bit? I have replaced sensor 1 and after a week I'm now getting an implausible signal fault on it. Do you think I could have a dodgy sensor?

Mike

[Doug_S2]

i think you have another problem with the car that is causing the car to run too hot (like maf) or you have an earth problem to the manfiold (hte brown wires on the same bolt to the egt electronics - are they connected?)

[Mikey-S]

Funny enough I did find those earth wires loose when I fitted the EGT sensor, so I know they're tight. Silly question, but are high temps anything to do with having straight through downpipes?

[Doug_S2]

is the car chipped? some chips do not like low backpressure in the exhaust - as they run far too high egts.

log the maf and egt on a 3rd to 4th wot run and post it up.

[Mikey-S]

It isn't chipped. I'll try to post a log tonight, cheers.

Mike

[Doug_S2]

you won't know what egts are doing because you have a c box ecu - we need tpo put a c box ecu in with egts switched on.

log block 003 and 020
then 003 and 115

[yorkie]

I have a similar problem, repaced bank 1 egt about a year ago, get "short to ground intermittent" every so often.

Clear the code and sometimes it will go a month without coming back but sometimes will also come back within a day.

I had replaced the maf at the same time as Doug warned me a failing maf could kill the egt's.

Checked/cleaned earth to manifold connection at the same time and was ok.

Ran some logs today and had peak boost of 1820 and maf of 224 so I don't think I have any leaks.

Now thinking I should check the connection to the egt.

[Mikey-S]

Doug, here's the log you suggested I do. Have you any ideas?

I ran it today with the MAF disconnected after advice from Grizz (thanks Grizz) and it still held back slightly. I also checked the fault codes and now both EGT sensors are showing an implausible signal fault code.

Mike






Monday 16 June 2008 18:57:19
8D0 907 551 C 2.7l V6/5VT 0002

Group A: '003 Group B: '020 Group C:
Engine Speed Mass Air Flow Throttle Valve Angle Ignition Timing Retardation Timing Retardation Timing Retardation Timing Retardation
TIME (G28) (G70) Timing Angle TIME Cylinder 1 Cylinder 2 Cylinder 3 Cylinder 4 TIME
Marker STAMP /min g/s % °BTDC STAMP CF CF CF CF STAMP
0.59 1080 16.64 10.2 -5.3 0.28 0 0 0 0
1.19 1200 20.17 15.3 18.8 0.88 3.8 3.8 3.8 0
1.79 1880 27.42 15.7 16.5 1.49 0.8 0.8 0.8 0
2.39 2560 30.83 14.1 10.5 2.1 0.8 0.8 0.8 0
2.99 2280 6.64 4.7 38.3 2.69 0 0 0 0
3.6 1880 43.22 72.9 18.8 3.29 1.5 1.5 1.5 1.5
4.21 2360 66.56 91 20.3 3.9 0.8 0.8 0.8 0.8
4.8 2960 105.17 76.1 18 4.51 3 0 0 3
5.41 3600 128.08 47.8 16.5 5.12 3 3 0 3
6.02 4240 148.58 48.2 17.3 5.72 0 0 0 0
6.67 4880 180.47 50.2 18 6.34 0 3 0 3
7.36 5560 188.67 52.5 16.5 7.01 2.3 6 0 4.5
8.05 5200 8.64 6.7 23.3 7.71 0.8 0.8 0.8 0.8
8.68 4040 144.67 47.5 15 8.37 3 3 3 6
9.31 4280 160.11 47.8 17.3 8.99 1.5 4.5 1.5 3.8
9.93 4560 163.72 49 13.5 9.62 0 3 0 2.3
10.58 4840 171 50.6 18 10.25 3 3 0 2.3
11.25 5120 187.22 51 17.3 10.91 3 2.3 0 1.5
11.94 5360 187.36 52.2 17.3 11.59 3 5.3 3 1.5
12.64 5640 195.61 52.9 16.5 12.29 3 5.3 3 4.5
13.37 5920 188.64 53.3 19.5 13 2.3 5.3 3 4.5
14.1 6120 190.03 55.7 12 13.73 2.3 4.5 2.3 4.5
14.79 4960 189.72 49 15 14.46 0 0 0 0
15.46 5040 174.14 50.6 17.3 15.13 4.5 9.8 7.5 6
16.14 5200 187.61 51.4 19.5 15.8 0 5.3 3 1.5
16.82 5360 184.36 51.8 20.3 16.48 0 5.3 3 1.5
17.52 5480 186.44 51.8 21 17.17 0 4.5 2.3 0.8
18.23 5640 190.78 52.9 21.8 17.87 0 4.5 2.3 0.8
18.94 5720 201.06 53.3 21.8 18.58 0 3.8 1.5 0
19.66 5880 198.92 52.9 22.5 19.29 0 3.8 1.5 0
20.38 6000 184.03 53.7 20.3 20.03 0 3 0.8 0
21.12 5880 0 5.5 35.3 20.75 0 2.3 0 0
21.79 5040 182.53 50.6 14.3 21.46 3.8 4.5 3.8 3.8
22.46 5000 10.53 8.2 44.3 22.13 3 8.3 2.3 6.8
23.12 4880 12.61 7.5 27.8 22.79 0 0 0 0
23.77 4640 12.69 7.5 15 23.45 0 0 0 0
24.41 4440 12.75 7.1 14.3 24.09 0 0 0 0
25.03 4200 12.22 7.1 14.3 24.73 0 0 0 0
25.64 4000 10.81 6.7 13.5 25.34 0 0 0 0
26.24 3800 11.44 6.7 14.3 25.94 0 0 0 0
26.85 3760 12.75 6.7 13.5 26.54 0 0 0 0
27.46 3720 11.61 6.7 13.5 27.15 0 0 0 0
28.05 3640 12.25 6.7 13.5 27.75 0 0 0 0
28.66 3600 12.5 6.7 13.5 28.35 0 0 0 0
29.26 3560 12.28 6.3 13.5 28.96 0 0 0 0
29.87 3520 12.06 6.3 13.5 29.56 0 0 0 0
Monday 16 June 2008 19:00:22
8D0 907 551 C 2.7l V6/5VT 0002

Group A: '003 Group B: '115 Group C:
Engine Speed Mass Air Flow Throttle Valve Angle Ignition Engine Speed Engine Load Boost Pressure Boost Pressure
TIME (G28) (G70) Timing Angle TIME (G28) (specified) (actual) TIME
Marker STAMP /min g/s % °BTDC STAMP /min % mbar mbar STAMP
0.04 800 4.25 2.7 1.5 0.31 800 16.5 1000 1000
0.61 760 3.92 2.7 3.8 0.91 760 16.5 1000 1000
1.21 760 3.94 2.7 8.3 1.51 760 16.5 1000 1000
1.81 760 3.97 2.7 5.3 2.12 800 17.3 1000 1000
2.42 800 3.61 2.7 1.5 2.73 840 44.4 1000 1000
3.02 1280 3.67 0 -9 3.32 1080 16.5 1000 1010
3.63 960 10.11 7.1 18.8 3.92 880 51.9 1000 1010
4.23 880 15.58 10.2 -4.5 4.53 1080 49.6 1000 1010
4.83 1320 17.03 9.8 23.3 5.14 1600 44.4 1000 1020
5.44 1880 27.39 14.5 24.8 5.74 2200 47.4 1000 1030
6.04 2640 49.47 27.1 27 6.34 3160 70.7 1000 1100
6.66 3720 103.86 25.5 6 6.95 3680 10.5 1000 1300
7.25 3320 9.22 5.5 15 7.56 3160 71.4 1350 1010
7.86 2480 69.61 54.9 21 8.16 2840 104.5 1520 1430
8.45 3160 108.64 58.4 16.5 8.76 3480 119.5 1530 1530
9.06 3840 132.14 47.5 18.8 9.37 4160 120.3 1500 1510
9.68 4480 165.36 49 13.5 10 4800 124.1 1470 1480
10.34 5120 191.64 51.4 18 10.69 5440 120.3 1430 1440
11.04 5760 200.92 52.9 22.5 11.41 6040 115 1410 1410
11.78 5960 0 5.1 25.5 12.12 5360 16.5 1120 1120
12.43 4280 152.58 45.9 9.8 12.76 4360 122.6 1490 1510
13.06 4480 161.78 48.2 16.5 13.39 4640 122.6 1480 1490
13.71 4760 174.67 49.8 18 14.05 4920 120.3 1460 1480
14.38 5040 175.67 51 16.5 14.71 5160 121.1 1450 1460
15.05 5320 185.39 51.4 18 15.41 5480 120.3 1430 1440
15.76 5600 191.33 52.5 19.5 16.11 5720 119.5 1420 1430
16.48 5880 200.03 53.3 19.5 16.83 5680 9.8 1000 1490
17.16 5160 11.81 7.8 45.8 17.51 4680 113.5 1470 1350
17.83 4760 170.81 49.8 12.8 18.14 4840 122.6 1460 1490
18.48 4920 170.28 50.2 15 18.81 5000 120.3 1460 1460
19.14 5080 184.86 50.6 15 19.48 5160 122.6 1450 1450
19.83 5240 188.42 51.8 15.8 20.17 5280 120.3 1440 1440
20.51 5360 188.17 51.8 15 20.86 5480 118 1430 1450
21.21 5480 72.33 12.5 -0.8 21.54 4960 9 1000 1220
21.86 4560 11.89 6.7 20.3 22.18 4520 9.8 1000 1090
22.5 4400 13.06 7.1 14.3 22.81 4320 9.8 1000 1070
23.13 4200 12.11 7.1 14.3 23.42 4080 9.8 1000 1060
23.73 4000 12.64 6.7 13.5 24.03 3880 9.8 1000 1060
24.33 3800 12.53 6.7 13.5 24.63 3680 10.5 1000 1050
24.93 3600 10.86 6.3 13.5 25.23 3480 10.5 1000 1050
25.54 3360 10.25 5.9 13.5 25.84 3240 10.5 1000 1050
26.14 3080 10.58 5.9 13.5 26.44 2640 11.3 1000 1040
26.75 2240 7.58 4.3 9.8 27.04 1920 10.5 1000 1030
27.34 2360 6.44 4.3 12 27.65 3240 10.5 1000 1030
27.96 3640 12.22 7.1 13.5 28.26 3480 11.3 1000 1040
28.55 3280 10.28 6.3 13.5 28.86 3120 11.3 1000 1040
29.16 2920 8.83 5.5 13.5 29.46 2760 11.3 1000 1040
29.76 2640 8.67 5.1 13.5 30.06 2640 11.3 1000 1040
30.36 2600 8.31 5.1 39 30.67 2560 11.3 1000 1030
30.96 2560 8.56 5.1 13.5 31.27 2520 11.3 1000 1030
31.57 2480 7.94 4.7 12.8 31.87 2480 11.3 1000 1030
32.18 2480 50 35.7 11.3 32.48 2600 75.2 1510 1120
32.78 2680 82.17 92.2 17.3 33.08 2800 111.3 1520 1510
33.39 2920 99 68.2 10.5 33.69 3080 113.5 1530 1540
34 3200 106.47 55.7 12.8 34.29 3320 120.3 1530 1530
34.59 3480 117.89 48.6 19.5 34.9 3600 115.8 1520 1530
35.2 3720 131.92 47.5 12 35.51 3840 118.8 1510 1530
35.81 3960 140.58 47.1 15 36.11 4120 120.3 1500 1520
36.42 4240 149.83 48.2 10.5 36.73 4320 122.6 1490 1520
37.03 4480 157.44 48.6 12 37.36 4560 123.3 1480 1500
37.68 4680 167.33 49 11.3 38 4840 121.8 1470 1480
38.34 4960 171 50.2 14.3 38.67 5040 120.3 1450 1450
39.01 5160 186.44 51 12.8 39.35 5280 119.5 1440 1440
39.7 5440 185.92 51.8 19.5 40.05 5520 118 1430 1440
40.43 5640 191.33 52.5 18 40.76 5760 118.8 1420 1430
41.12 5640 0 5.1 17.3 41.45 5080 9 1000 1190
41.78 4640 11.44 6.7 26.3 42.09 4200 9.8 1000 1080
42.4 3080 8.94 5.5 13.5 42.7 3120 9.8 1000 1050

[S4]

Mike I am no expert on the logs, but you need to rev it a bit more than that.... if you look at a lot of the old logs they are well into the 6k rmp.


Darren

[Mikey-S]

The first run goes over 6k and the second tops at 5880... I thought that would be plenty?

Mike

[yorkie]

MAF readings look low to me but Doug will soon tell you.

If they are you could have cooked your egts.

Wish I could sort mine out, may resort to buying another egt although I'm not convinced this one is faulty.

[Doug_S2]

If you have egt codes and other issues you should not run the car with the maf disconnected - it can run lean - and it looks like you could have damaged the other EGT.

it is hard to say from the logs what is up. We would use one of our ecus to see egts.

tell me what block 032 is saying. Are there any leaks?

[S4]

most keep going into around 6400 +

http://www.rs246.com/index.php?name=PNp ... light=logs

http://www.rs246.com/index.php?name=PNp ... light=logs

http://www.rs246.com/index.php?name=PNp ... light=logs

I see that yours are starting to drop before that.. I that is around 250bhp so that is a low reading.... I am not really up on this but I was thinking near 220 is a good reading. yours is not massively low, i have seen 170.... did you clear all the codes then blast it? mine has go into crap mode before, around 7 psi!!

Darren