Help on diagnosis

[nczimmerman2]

Hey guys, Thanks in advance

I have a 1994 SC auto that I am letting my daughter use for her first car. It has been very good, but I have a problem now that I can't figure out. It idles good, but has no power, in or out of gear. It won't even pull up on a set of ramps. It happened about two weeks ago, it started runnung bad, and spluttering when I accelorated. THe Actron computer I have said the MAF was out of range. So I pulled one off the 1995 SC I have and put it on the 1994. Problem solved......for two days. Now It has no power, and when I make a WOT run, the manifolds, converters, pipes and resonator glow cherry red. I asked my mechanic, and he said it sounded like the MAF had gone bad again, so I bought a new one and swapped them out. Reset the computer. No change. I have gradually replaced over time as normal maintainance, the O2's, egr, egr solenoid, fuel filter, plugs wires coil. Fuel pressure is 30ish at idle, not sure at wot. I have a fuel pump to install to see if that is it. Can any of you look at the data stream frames below and tell me if you see anything wierd? My mechanic then told me it sounda like its running lean. I dropped the exhaust to see if that changed anything like plugged cats. It didn't


I see the knock sensor may be bad, I have a new one of those, to put on, and a new EGR pressure sensing switch.

1 of 2
332
ENG
EGR Flow
Insufficient

2 of 2
225
ENG
Dyn Response Test
Knock Sensor Not
Detected


Vehicle Data List

ECT(V) 0.4
ECT(øF) 218
ENGINE SPD 704
EVR(%) 0
FUELPW1(mS) 3.6
FUELPW2(mS) 3.6
IAC(%) 41
IAT(V) 0.8
IAT(øF) 178
LOOP STATUS Clsd
MAF(V) 0.8
O2SEN 1(V) 0.38
O2SEN 2(V) 0.10
SPARK(ø) 20
ST FTRM1(%) -5
ST FTRM2(%) -4
TP MODE C/T
TPS(V) 0.8
VPWR(V) 13.1
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame:-5 Time:-7.7
ECT(V) 0.4
ECT(øF) 218
ENGINE SPD 704
EVR(%) 0
FUELPW1(mS) 3.6
FUELPW2(mS) 3.6
IAC(%) 41
IAT(V) 0.8
IAT(øF) 178
LOOP STATUS Clsd
MAF(V) 0.8
O2SEN 1(V) 0.11
O2SEN 2(V) 0.70
SPARK(ø) 19
ST FTRM1(%) -4
ST FTRM2(%) -6
TP MODE C/T
TPS(V) 0.8
VPWR(V) 13.2
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame:-4 Time:-6.2
ECT(V) 0.4
ECT(øF) 217
ENGINE SPD 708
EVR(%) 0
FUELPW1(mS) 3.6
FUELPW2(mS) 3.6
IAC(%) 41
IAT(V) 0.8
IAT(øF) 178
LOOP STATUS Clsd
MAF(V) 0.8
O2SEN 1(V) 0.20
O2SEN 2(V) 0.71
SPARK(ø) 19
ST FTRM1(%) -4
ST FTRM2(%) -6
TP MODE C/T
TPS(V) 0.8
VPWR(V) 13.1
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame:-3 Time:-4.6
ECT(V) 0.4
ECT(øF) 217
ENGINE SPD 708
EVR(%) 0
FUELPW1(mS) 3.6
FUELPW2(mS) 3.6
IAC(%) 41
IAT(V) 0.7
IAT(øF) 178
LOOP STATUS Clsd
MAF(V) 0.8
O2SEN 1(V) 0.12
O2SEN 2(V) 0.72
SPARK(ø) 19
ST FTRM1(%) -3
ST FTRM2(%) -5
TP MODE C/T
TPS(V) 0.8
VPWR(V) 13.1
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame:-2 Time:-3.1
ECT(V) 0.4
ECT(øF) 216
ENGINE SPD 800
EVR(%) 0
FUELPW1(mS) 19.3
FUELPW2(mS) 19.0
IAC(%) 57
IAT(V) 0.7
IAT(øF) 178
LOOP STATUS Open
MAF(V) 2.3
O2SEN 1(V) 0.87
O2SEN 2(V) 0.85
SPARK(ø) 2
ST FTRM1(%) 29
ST FTRM2(%) 29
TP MODE P/T
TPS(V) 2.4
VPWR(V) 13.1
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame:-1 Time:-1.5
ECT(V) 0.4
ECT(øF) 216
ENGINE SPD 1856
EVR(%) 0
FUELPW1(mS) 1.4
FUELPW2(mS) 1.4
IAC(%) 44
IAT(V) 0.7
IAT(øF) 179
LOOP STATUS Clsd
MAF(V) 0.9
O2SEN 1(V) 0.85
O2SEN 2(V) 0.86
SPARK(ø) 35
ST FTRM1(%) 10
ST FTRM2(%) 9
TP MODE C/T
TPS(V) 0.8
VPWR(V) 13.1
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame: 0 Time:0.0
ECT(V) 0.4
ECT(øF) 215
ENGINE SPD 1816
EVR(%) 0
FUELPW1(mS) 23.2
FUELPW2(mS) 23.2
IAC(%) 57
IAT(V) 0.7
IAT(øF) 182
LOOP STATUS Open
MAF(V) 3.0
O2SEN 1(V) 0.83
O2SEN 2(V) 0.83
SPARK(ø) 5
ST FTRM1(%) 27
ST FTRM2(%) 27
TP MODE WOT
TPS(V) 4.5
VPWR(V) 13.0
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame: 1 Time:1.5
ECT(V) 0.4
ECT(øF) 214
ENGINE SPD 3572
EVR(%) 0
FUELPW1(mS) 28.9
FUELPW2(mS) 28.9
IAC(%) 60
IAT(V) 0.7
IAT(øF) 189
LOOP STATUS Open
MAF(V) 3.8
O2SEN 1(V) 0.85
O2SEN 2(V) 0.69
SPARK(ø) 13
ST FTRM1(%) 49
ST FTRM2(%) 49
TP MODE WOT
TPS(V) 4.5
VPWR(V) 12.8
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame: 2 Time:3.1
ECT(V) 0.4
ECT(øF) 215
ENGINE SPD 4144
EVR(%) 0
FUELPW1(mS) 30.5
FUELPW2(mS) 30.5
IAC(%) 61
IAT(V) 0.6
IAT(øF) 195
LOOP STATUS Open
MAF(V) 4.0
O2SEN 1(V) 0.86
O2SEN 2(V) 0.41
SPARK(ø) 15
ST FTRM1(%) 54
ST FTRM2(%) 54
TP MODE WOT
TPS(V) 4.5
VPWR(V) 12.8
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame: 3 Time:4.6
ECT(V) 0.4
ECT(øF) 216
ENGINE SPD 4348
EVR(%) 0
FUELPW1(mS) 30.2
FUELPW2(mS) 30.2
IAC(%) 62
IAT(V) 0.6
IAT(øF) 200
LOOP STATUS Open
MAF(V) 4.0
O2SEN 1(V) 0.84
O2SEN 2(V) 0.46
SPARK(ø) 15
ST FTRM1(%) 54
ST FTRM2(%) 54
TP MODE WOT
TPS(V) 4.4
VPWR(V) 12.8
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame: 4 Time:6.2
ECT(V) 0.4
ECT(øF) 217
ENGINE SPD 4316
EVR(%) 0
FUELPW1(mS) 29.9
FUELPW2(mS) 29.9
IAC(%) 62
IAT(V) 0.5
IAT(øF) 206
LOOP STATUS Open
MAF(V) 4.0
O2SEN 1(V) 0.84
O2SEN 2(V) 0.44
SPARK(ø) 14
ST FTRM1(%) 54
ST FTRM2(%) 54
TP MODE WOT
TPS(V) 4.4
VPWR(V) 12.8
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame: 5 Time:7.7
ECT(V) 0.4
ECT(øF) 218
ENGINE SPD 4272
EVR(%) 0
FUELPW1(mS) 29.8
FUELPW2(mS) 29.8
IAC(%) 61
IAT(V) 0.5
IAT(øF) 211
LOOP STATUS Open
MAF(V) 3.9
O2SEN 1(V) 0.83
O2SEN 2(V) 0.51
SPARK(ø) 14
ST FTRM1(%) 54
ST FTRM2(%) 54
TP MODE WOT
TPS(V) 4.4
VPWR(V) 12.9
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame: 6 Time:9.2
ECT(V) 0.4
ECT(øF) 219
ENGINE SPD 4244
EVR(%) 0
FUELPW1(mS) 29.7
FUELPW2(mS) 29.7
IAC(%) 61
IAT(V) 0.4
IAT(øF) 216
LOOP STATUS Open
MAF(V) 3.9
O2SEN 1(V) 0.82
O2SEN 2(V) 0.58
SPARK(ø) 14
ST FTRM1(%) 54
ST FTRM2(%) 54
TP MODE WOT
TPS(V) 4.4
VPWR(V) 12.8
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame: 7 Time:10.8
ECT(V) 0.4
ECT(øF) 220
ENGINE SPD 4156
EVR(%) 0
FUELPW1(mS) 30.0
FUELPW2(mS) 30.0
IAC(%) 61
IAT(V) 0.4
IAT(øF) 221
LOOP STATUS Open
MAF(V) 3.9
O2SEN 1(V) 0.81
O2SEN 2(V) 0.80
SPARK(ø) 11
ST FTRM1(%) 54
ST FTRM2(%) 54
TP MODE WOT
TPS(V) 4.4
VPWR(V) 12.9
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame: 8 Time:12.3
ECT(V) 0.4
ECT(øF) 221
ENGINE SPD 4008
EVR(%) 0
FUELPW1(mS) 30.2
FUELPW2(mS) 30.2
IAC(%) 61
IAT(V) 0.4
IAT(øF) 225
LOOP STATUS Open
MAF(V) 3.9
O2SEN 1(V) 0.80
O2SEN 2(V) 0.78
SPARK(ø) 12
ST FTRM1(%) 52
ST FTRM2(%) 52
TP MODE P/T
TPS(V) 2.4
VPWR(V) 12.9
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame: 9 Time:13.8
ECT(V) 0.4
ECT(øF) 222
ENGINE SPD 2836
EVR(%) 0
FUELPW1(mS) 1.1
FUELPW2(mS) 1.1
IAC(%) 45
IAT(V) 0.4
IAT(øF) 221
LOOP STATUS Clsd
MAF(V) 0.9
O2SEN 1(V) 0.80
O2SEN 2(V) 0.78
SPARK(ø) 35
ST FTRM1(%) 3
ST FTRM2(%) 3
TP MODE C/T
TPS(V) 0.8
VPWR(V) 13.1
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame:10 Time:15.4
ECT(V) 0.4
ECT(øF) 222
ENGINE SPD 1504
EVR(%) 0
FUELPW1(mS) 1.3
FUELPW2(mS) 1.3
IAC(%) 43
IAT(V) 0.4
IAT(øF) 219
LOOP STATUS Clsd
MAF(V) 0.9
O2SEN 1(V) 0.76
O2SEN 2(V) 0.77
SPARK(ø) 35
ST FTRM1(%) -5
ST FTRM2(%) -5
TP MODE C/T
TPS(V) 0.8
VPWR(V) 13.1
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame:11 Time:16.9
ECT(V) 0.4
ECT(øF) 222
ENGINE SPD 1936
EVR(%) 0
FUELPW1(mS) 23.5
FUELPW2(mS) 23.5
IAC(%) 57
IAT(V) 0.4
IAT(øF) 218
LOOP STATUS Open
MAF(V) 3.0
O2SEN 1(V) 0.76
O2SEN 2(V) 0.76
SPARK(ø) 4
ST FTRM1(%) 28
ST FTRM2(%) 28
TP MODE WOT
TPS(V) 4.5
VPWR(V) 13.0
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame:12 Time:18.5
ECT(V) 0.4
ECT(øF) 224
ENGINE SPD 3840
EVR(%) 0
FUELPW1(mS) 29.9
FUELPW2(mS) 29.9
IAC(%) 61
IAT(V) 0.4
IAT(øF) 223
LOOP STATUS Open
MAF(V) 3.8
O2SEN 1(V) 0.80
O2SEN 2(V) 0.80
SPARK(ø) 12
ST FTRM1(%) 52
ST FTRM2(%) 52
TP MODE WOT
TPS(V) 4.5
VPWR(V) 12.8
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame:13 Time:20.0
ECT(V) 0.4
ECT(øF) 223
ENGINE SPD 3992
EVR(%) 0
FUELPW1(mS) 29.7
FUELPW2(mS) 29.7
IAC(%) 61
IAT(V) 0.4
IAT(øF) 230
LOOP STATUS Open
MAF(V) 3.9
O2SEN 1(V) 0.79
O2SEN 2(V) 0.75
SPARK(ø) 12
ST FTRM1(%) 54
ST FTRM2(%) 54
TP MODE WOT
TPS(V) 4.5
VPWR(V) 12.8
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame:14 Time:21.5
ECT(V) 0.4
ECT(øF) 224
ENGINE SPD 3960
EVR(%) 0
FUELPW1(mS) 29.5
FUELPW2(mS) 29.5
IAC(%) 61
IAT(V) 0.3
IAT(øF) 233
LOOP STATUS Open
MAF(V) 3.8
O2SEN 1(V) 0.78
O2SEN 2(V) 0.77
SPARK(ø) 12
ST FTRM1(%) 52
ST FTRM2(%) 52
TP MODE WOT
TPS(V) 4.5
VPWR(V) 12.8
VREF(V) 5.0
VSS(MPH) 0
WOT A/C OFF Off
Frame:15 Time:-9.9

[99GSXR750]

Have you check the balancer?

[nczimmerman2]

No but I will thanks, just curious
, why would it be the balancer?

[99GSXR750]

If the balancer moved the timing could be off. Balancers are known to fail on these cars.

[nczimmerman2]

HMMMM that could also explain the new oil leak, and the new scrunching noise at the front. I need to check that

[KMT]

Shows RPM vs. TPS Voltage as:

704 ~ 0.8 (TP MODE C/T)
708 ~ 0.8 (TP MODE C/T)
800 ~ 2.4 (TP MODE P/T)
1856 ~ 0.8 (TP MODE C/T)
1816 ~ 4.5 (TP MODE WOT)
3572 ~ 4.5 (TP MODE WOT)
4144 ~ 4.5 (TP MODE WOT)
4348 ~ 4.4 (TP MODE WOT)
4008 ~ 2.4 (TP MODE P/T)
2836 ~ 0.8 (TP MODE C/T)
1504 ~ 0.8 (TP MODE C/T)
1936 ~ 4.5 (TP MODE WOT)
3840 ~ 4.5 (TP MODE WOT)

Most of these events looked to be 1 or 2 minutes apart...were you constantly running/gunning the throttle up and down while testing? Or did you move and hold?

>scrunching noise at the front
Oh no....ouch. That does sound like a balancer problem.

[nczimmerman2]

I did vary the throttle. It would not hit the rev limit even at WOT. I will check the balancer tonight

[transam396]

Could it possibly be clogged converters? my son got a 91 F250 for free from his dad cause the truck would idle great but did not have anypower, Turned out that converter was clogged punched some holes in and drove it from alabama to Ga no probs....so just a thought

[nczimmerman2]

Bad balancer it was. Zoom Zoom, now it will burn out through 1st and chirp second Thanks for all the responses.

[99GSXR750]

Originally Posted by nczimmerman2

Bad balancer it was. Zoom Zoom, now it will burn out through 1st and chirp second Thanks for all the responses.

Good to see you got it running. Where did you find a balancer on a Saturday?

[TinManSC92]

i don't even bother with those part changers we call mechanics today. i could make a better guessing game out of these cars than they could......well maybe.$$$$$