- This topic has 6 replies, 4 voices, and was last updated 9 years, 1 month ago by
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So, I bought my son a POS 1999 Monte Carlo last year for $1,000.00. 3.1 V6. We’ve been able to get about 20k miles out of it, I can’t really complain. Problem is the body is pretty sound, and not too bad to drive for a college student. Also, I’m pretty sure the engine is not original and the prior owner did a crappy job of replacing the engine. Pretty sure the engine was from a pre OBDII system and they attempted to convert the engine to OBDII. However, I have to make it last for another year or two until he’s out of college. First off, it had a CEL and drivability is terrible. Feels like it has no power, and has difficulty accelerating.
I plugged my scan tool in and got a camshaft position sensor fault, and a P1111 and P0113 which are the codes for the intake air temp sensor. I replaced the camshaft position sensor & found the connector to the IAT sensor was bad. Put a new connector on and all is good with those codes. Cleared codes and the IAT and Camshaft sensor is good to go.
But now those are fixed it has thrown a P0171 on bank 1. I looked at the fuel trim at idle and is 26.4. Points to a vacuum leak. I sprayed some carb/choke cleaner at the intake between cylinder 3&5 and the RPM’s bumped up a little bit. Also, son reports a very slow coolant loss issue. I looked at the back of the engine it appears wet and got a very slight whiff of coolant. I think I have an intake gasket leak. Want to run that by the forum to see what it thinks.
Onto the plugged cat issue, I have an exhaust leak on the manifold at cylinder #1. I got the engine up to operating temp, and up to 2,000 RPMS. The #2 O2 sensor was all over the place. It would drop down to .268 kick up to .65, back down to .3 back up etc. would not hold hat .5 volt.
I have a vacuum gauge on the way from amazon to confirm scan tool readings. I’ll hook it up Wednesday night and see what that is. But, the exhaust leak, and crazy reading from the O2 sensors are pointing me to plugged cat. Below is some data that I recorded:
OBD2 STAT CA
———————
FRAME: 92 TM: 42.4
ENG SPEED(RPM) 2096
COOLANT(°F) 225
O2S11(V) 0.765
O2S12(V) 0.545
OBD2 STAT CA———————
FRAME: 93 TM: 42.9
ENG SPEED(RPM) 2089
COOLANT(°F) 225
O2S11(V) 0.755
O2S12(V) 0.615
OBD2 STAT CA———————
FRAME: 94 TM: 43.3
ENG SPEED(RPM) 2109
COOLANT(°F) 225
O2S11(V) 0.700
O2S12(V) 0.640
OBD2 STAT CA———————
FRAME: 95 TM: 43.8
ENG SPEED(RPM) 2105
COOLANT(°F) 225
O2S11(V) 0.510
O2S12(V) 0.645
OBD2 STAT CA———————
FRAME: 96 TM: 44.2
ENG SPEED(RPM) 2092
COOLANT(°F) 225
O2S11(V) 0.155
O2S12(V) 0.595
OBD2 STAT CA———————
FRAME: 97 TM: 44.7
ENG SPEED(RPM) 2086
COOLANT(°F) 225
O2S11(V) 0.190
O2S12(V) 0.575
OBD2 STAT CA———————
FRAME: 98 TM: 45.1
ENG SPEED(RPM) 2105
COOLANT(°F) 225
O2S11(V) 0.150
O2S12(V) 0.400
OBD2 STAT CA———————
FRAME: 99 TM: 45.6
ENG SPEED(RPM) 2076
COOLANT(°F) 225
O2S11(V) 0.190
O2S12(V) 0.515
OBD2 STAT CA———————
FRAME:100 TM: 46.0
ENG SPEED(RPM) 2072
COOLANT(°F) 225
O2S11(V) 0.135
O2S12(V) 0.360
OBD2 STAT CA———————
FRAME:101 TM: 46.5
ENG SPEED(RPM) 2066
COOLANT(°F) 225
O2S11(V) 0.160
O2S12(V) 0.415
OBD2 STAT CA———————
FRAME:102 TM: 46.9
ENG SPEED(RPM) 2096
COOLANT(°F) 225
O2S11(V) 0.540
O2S12(V) 0.590
OBD2 STAT CA———————
FRAME:103 TM: 47.4
ENG SPEED(RPM) 2099
COOLANT(°F) 225
O2S11(V) 0.725
O2S12(V) 0.435
OBD2 STAT CA———————
FRAME:104 TM: 47.9
ENG SPEED(RPM) 2089
COOLANT(°F) 226
O2S11(V) 0.740
O2S12(V) 0.330
OBD2 STAT CA———————
FRAME:105 TM: 48.3
ENG SPEED(RPM) 2105
COOLANT(°F) 226
O2S11(V) 0.740
O2S12(V) 0.325
OBD2 STAT CA———————
FRAME:106 TM: 48.8
ENG SPEED(RPM) 2092
COOLANT(°F) 226
O2S11(V) 0.735
O2S12(V) 0.340
OBD2 STAT CA———————
FRAME:107 TM: 49.2
ENG SPEED(RPM) 2096
COOLANT(°F) 226
O2S11(V) 0.735
O2S12(V) 0.315
OBD2 STAT CA———————
FRAME:108 TM: 49.7
ENG SPEED(RPM) 2112
COOLANT(°F) 226
O2S11(V) 0.680
O2S12(V) 0.605
OBD2 STAT CA———————
FRAME:109 TM: 50.1
ENG SPEED(RPM) 2116
COOLANT(°F) 226
O2S11(V) 0.415
O2S12(V) 0.600
OBD2 STAT CA———————
FRAME:110 TM: 50.6
ENG SPEED(RPM) 2122
COOLANT(°F) 226
O2S11(V) 0.220
O2S12(V) 0.530
OBD2 STAT CA———————
FRAME:111 TM: 51.1
ENG SPEED(RPM) 2096
COOLANT(°F) 226
O2S11(V) 0.225
O2S12(V) 0.525
OBD2 STAT CA———————
FRAME:112 TM: 51.5
ENG SPEED(RPM) 2105
COOLANT(°F) 226
O2S11(V) 0.150
O2S12(V) 0.515
OBD2 STAT CA———————
FRAME:113 TM: 52.0
ENG SPEED(RPM) 2096
COOLANT(°F) 228
O2S11(V) 0.225
O2S12(V) 0.570
OBD2 STAT CA———————
FRAME:114 TM: 52.5
ENG SPEED(RPM) 2105
COOLANT(°F) 226
O2S11(V) 0.205
O2S12(V) 0.560
OBD2 STAT CA———————
FRAME:115 TM: 52.9
ENG SPEED(RPM) 2099
COOLANT(°F) 228
O2S11(V) 0.150
O2S12(V) 0.500
OBD2 STAT CA———————
FRAME:116 TM: 53.4
ENG SPEED(RPM) 2102
COOLANT(°F) 228
O2S11(V) 0.145
O2S12(V) 0.440
OBD2 STAT CA———————
FRAME:117 TM: 53.8
ENG SPEED(RPM) 2099
COOLANT(°F) 228
O2S11(V) 0.165
O2S12(V) 0.515
OBD2 STAT CA———————
FRAME:118 TM: 54.3
ENG SPEED(RPM) 2109
COOLANT(°F) 228
O2S11(V) 0.135
O2S12(V) 0.380
OBD2 STAT CA———————
FRAME:119 TM: 54.7
ENG SPEED(RPM) 2109
COOLANT(°F) 228
O2S11(V) 0.300
O2S12(V) 0.325
OBD2 STAT CA———————
FRAME:120 TM: 55.2
ENG SPEED(RPM) 2116
COOLANT(°F) 228
O2S11(V) 0.515
O2S12(V) 0.295
OBD2 STAT CA———————
FRAME:121 TM: 55.6
ENG SPEED(RPM) 2096
COOLANT(°F) 228
O2S11(V) 0.735
O2S12(V) 0.490
OBD2 STAT CA———————
FRAME:122 TM: 56.1
ENG SPEED(RPM) 2096
COOLANT(°F) 228
O2S11(V) 0.755
O2S12(V) 0.495
OBD2 STAT CA———————
FRAME:123 TM: 56.6
ENG SPEED(RPM) 2109
COOLANT(°F) 228
O2S11(V) 0.710
O2S12(V) 0.635
OBD2 STAT CA———————
FRAME:124 TM: 57.1
ENG SPEED(RPM) 2116
COOLANT(°F) 228
O2S11(V) 0.700
O2S12(V) 0.615
OBD2 STAT CA———————
FRAME:125 TM: 57.5
ENG SPEED(RPM) 2119
COOLANT(°F) 228
O2S11(V) 0.410
O2S12(V) 0.635
OBD2 STAT CA———————
FRAME:126 TM: 58.0
ENG SPEED(RPM) 2099
COOLANT(°F) 228
O2S11(V) 0.460
O2S12(V) 0.635
OBD2 STAT CA———————
FRAME:127 TM: 58.5
ENG SPEED(RPM) 2096
COOLANT(°F) 228
O2S11(V) 0.300
O2S12(V) 0.580
OBD2 STAT CA———————
FRAME:128 TM: 58.9
ENG SPEED(RPM) 2105
COOLANT(°F) 228
O2S11(V) 0.155
O2S12(V) 0.455
OBD2 STAT CA———————
FRAME:129 TM: 59.4
ENG SPEED(RPM) 2105
COOLANT(°F) 228
O2S11(V) 0.260
O2S12(V) 0.530
OBD2 STAT CA———————
FRAME:130 TM: 59.8
ENG SPEED(RPM) 2105
COOLANT(°F) 228
O2S11(V) 0.315
O2S12(V) 0.620
OBD2 STAT CA———————
FRAME:131 TM: 60.3
ENG SPEED(RPM) 2099
COOLANT(°F) 228
O2S11(V) 0.220
O2S12(V) 0.590
OBD2 STAT CA———————
FRAME:132 TM: 60.8
ENG SPEED(RPM) 2092
COOLANT(°F) 228
O2S11(V) 0.455
O2S12(V) 0.505
OBD2 STAT CA———————
FRAME:133 TM: 61.2
ENG SPEED(RPM) 2092
COOLANT(°F) 228
O2S11(V) 0.475
O2S12(V) 0.535
OBD2 STAT CA———————
FRAME:134 TM: 61.7
ENG SPEED(RPM) 2102
COOLANT(°F) 228
O2S11(V) 0.695
O2S12(V) 0.665
OBD2 STAT CA———————
FRAME:135 TM: 62.1
ENG SPEED(RPM) 2116
COOLANT(°F) 228
O2S11(V) 0.725
O2S12(V) 0.665
OBD2 STAT CA———————
FRAME:136 TM: 62.6
ENG SPEED(RPM) 2105
COOLANT(°F) 228
O2S11(V) 0.715
O2S12(V) 0.600
OBD2 STAT CA———————
FRAME:137 TM: 63.1
ENG SPEED(RPM) 2112
COOLANT(°F) 228
O2S11(V) 0.490
O2S12(V) 0.625
OBD2 STAT CA———————
FRAME:138 TM: 63.5
ENG SPEED(RPM) 2089
COOLANT(°F) 228
O2S11(V) 0.140
O2S12(V) 0.480
OBD2 STAT CA———————
FRAME:139 TM: 64.0
ENG SPEED(RPM) 2082
COOLANT(°F) 228
O2S11(V) 0.145
O2S12(V) 0.335
OBD2 STAT CA———————
FRAME:140 TM: 64.5
ENG SPEED(RPM) 2092
COOLANT(°F) 228
O2S11(V) 0.195
O2S12(V) 0.415
OBD2 STAT CA———————
FRAME:141 TM: 64.9
ENG SPEED(RPM) 2082
COOLANT(°F) 228
O2S11(V) 0.555
O2S12(V) 0.255
OBD2 STAT CA———————
FRAME:142 TM: 65.4
ENG SPEED(RPM) 2086
COOLANT(°F) 228
O2S11(V) 0.515
O2S12(V) 0.245
OBD2 STAT CA———————
FRAME:143 TM: 65.8
ENG SPEED(RPM) 2089
COOLANT(°F) 228
O2S11(V) 0.420
O2S12(V) 0.300
OBD2 STAT CA———————
FRAME:144 TM: 66.3
ENG SPEED(RPM) 2072
COOLANT(°F) 228
O2S11(V) 0.655
O2S12(V) 0.335
OBD2 STAT CA———————
FRAME:145 TM: 66.8
ENG SPEED(RPM) 2082
COOLANT(°F) 228
O2S11(V) 0.740
O2S12(V) 0.385
OBD2 STAT CA———————
FRAME:146 TM: 67.2
ENG SPEED(RPM) 2066
COOLANT(°F) 228
O2S11(V) 0.720
O2S12(V) 0.265
OBD2 STAT CA———————
FRAME:147 TM: 67.7
ENG SPEED(RPM) 2072
COOLANT(°F) 228
O2S11(V) 0.720
O2S12(V) 0.275
OBD2 STAT CA———————
FRAME:148 TM: 68.1
ENG SPEED(RPM) 2059
COOLANT(°F) 228
O2S11(V) 0.760
O2S12(V) 0.370
OBD2 STAT CA———————
FRAME:149 TM: 68.6
ENG SPEED(RPM) 2086
COOLANT(°F) 228
O2S11(V) 0.745
O2S12(V) 0.445
OBD2 STAT CA———————
FRAME:150 TM: 69.0
ENG SPEED(RPM) 2059
COOLANT(°F) 228
O2S11(V) 0.730
O2S12(V) 0.325
OBD2 STAT CA———————
FRAME:151 TM: 69.5
ENG SPEED(RPM) 2063
COOLANT(°F) 228
O2S11(V) 0.705
O2S12(V) 0.270
OBD2 STAT CA———————
FRAME:152 TM: 69.9
ENG SPEED(RPM) 2069
COOLANT(°F) 228
O2S11(V) 0.755
O2S12(V) 0.340
OBD2 STAT CA———————
FRAME:153 TM: 70.4
ENG SPEED(RPM) 2072
COOLANT(°F) 226
O2S11(V) 0.750
O2S12(V) 0.455
OBD2 STAT CA———————
FRAME:154 TM: 70.9
ENG SPEED(RPM) 2069
COOLANT(°F) 226
O2S11(V) 0.755
O2S12(V) 0.590
OBD2 STAT CA———————
FRAME:155 TM: 71.3
ENG SPEED(RPM) 2066
COOLANT(°F) 226
O2S11(V) 0.755
O2S12(V) 0.485
OBD2 STAT CA———————
FRAME:156 TM: 71.8
ENG SPEED(RPM) 2056
COOLANT(°F) 226
O2S11(V) 0.755
O2S12(V) 0.380
OBD2 STAT CA———————
FRAME:157 TM: 72.2
ENG SPEED(RPM) 2066
COOLANT(°F) 226
O2S11(V) 0.720
O2S12(V) 0.320
OBD2 STAT CA———————
FRAME:158 TM: 72.7
ENG SPEED(RPM) 2063
COOLANT(°F) 226
O2S11(V) 0.755
O2S12(V) 0.460
OBD2 STAT CA———————
FRAME:159 TM: 73.1
ENG SPEED(RPM) 2069
COOLANT(°F) 226
O2S11(V) 0.765
O2S12(V) 0.515
OBD2 STAT CA———————
FRAME:160 TM: 73.6
ENG SPEED(RPM) 2066
COOLANT(°F) 226
O2S11(V) 0.725
O2S12(V) 0.330
OBD2 STAT CA———————
FRAME:161 TM: 74.0
ENG SPEED(RPM) 2046
COOLANT(°F) 226
O2S11(V) 0.750
O2S12(V) 0.345
OBD2 STAT CA———————
FRAME:162 TM: 74.5
ENG SPEED(RPM) 2050
COOLANT(°F) 226
O2S11(V) 0.730
O2S12(V) 0.305
OBD2 STAT CA———————
FRAME:163 TM: 74.9
ENG SPEED(RPM) 2037
COOLANT(°F) 225
O2S11(V) 0.680
O2S12(V) 0.300
OBD2 STAT CA———————
FRAME:164 TM: 75.4
ENG SPEED(RPM) 2053
COOLANT(°F) 226
O2S11(V) 0.630
O2S12(V) 0.230
OBD2 STAT CA———————
FRAME:165 TM: 75.9
ENG SPEED(RPM) 2028
COOLANT(°F) 226
O2S11(V) 0.295
O2S12(V) 0.260
OBD2 STAT CA———————
FRAME:166 TM: 76.3
ENG SPEED(RPM) 2034
COOLANT(°F) 226
O2S11(V) 0.205
O2S12(V) 0.380
OBD2 STAT CA———————
FRAME:167 TM: 76.8
ENG SPEED(RPM) 2034
COOLANT(°F) 225
O2S11(V) 0.320
O2S12(V) 0.425
OBD2 STAT CA———————
FRAME:168 TM: 77.2
ENG SPEED(RPM) 2021
COOLANT(°F) 225
O2S11(V) 0.460
O2S12(V) 0.290
OBD2 STAT CA———————
FRAME:169 TM: 77.7
ENG SPEED(RPM) 2028
COOLANT(°F) 225
O2S11(V) 0.460
O2S12(V) 0.470
OBD2 STAT CA———————
FRAME:170 TM: 78.2
ENG SPEED(RPM) 2025
COOLANT(°F) 225
O2S11(V) 0.740
O2S12(V) 0.410
OBD2 STAT CA———————
FRAME:171 TM: 78.7
ENG SPEED(RPM) 2021
COOLANT(°F) 225
O2S11(V) 0.755
O2S12(V) 0.665
OBD2 STAT CA———————
FRAME:172 TM: 79.1
ENG SPEED(RPM) 2012
COOLANT(°F) 225
O2S11(V) 0.720
O2S12(V) 0.675
OBD2 STAT CA———————
FRAME:173 TM: 79.6
ENG SPEED(RPM) 2021
COOLANT(°F) 225
O2S11(V) 0.630
O2S12(V) 0.590
OBD2 STAT CA———————
FRAME:174 TM: 80.1
ENG SPEED(RPM) 2012
COOLANT(°F) 225
O2S11(V) 0.675
O2S12(V) 0.385
OBD2 STAT CA———————
FRAME:175 TM: 80.5
ENG SPEED(RPM) 2003
COOLANT(°F) 225
O2S11(V) 0.745
O2S12(V) 0.390
OBD2 STAT CA———————
FRAME:176 TM: 81.0
ENG SPEED(RPM) 2000
COOLANT(°F) 225
O2S11(V) 0.715
O2S12(V) 0.595
OBD2 STAT CA———————
FRAME:177 TM: 81.4
ENG SPEED(RPM) 2012
COOLANT(°F) 225
O2S11(V) 0.715
O2S12(V) 0.605
OBD2 STAT CA———————
FRAME:178 TM: 81.9
ENG SPEED(RPM) 1994
COOLANT(°F) 225
O2S11(V) 0.760
O2S12(V) 0.565
OBD2 STAT CA———————
FRAME:179 TM: 82.3
ENG SPEED(RPM) 1982
COOLANT(°F) 225
O2S11(V) 0.735
O2S12(V) 0.355
OBD2 STAT CA———————
FRAME:180 TM: 82.8
ENG SPEED(RPM) 1988
COOLANT(°F) 225
O2S11(V) 0.715
O2S12(V) 0.360
OBD2 STAT CA———————
FRAME:181 TM: 83.2
ENG SPEED(RPM) 1982
COOLANT(°F) 225
O2S11(V) 0.690
O2S12(V) 0.355
OBD2 STAT CA———————
FRAME:182 TM: 83.7
ENG SPEED(RPM) 1973
COOLANT(°F) 225
O2S11(V) 0.590
O2S12(V) 0.305
OBD2 STAT CA———————
FRAME:183 TM: 84.2
ENG SPEED(RPM) 1964
COOLANT(°F) 223
O2S11(V) 0.200
O2S12(V) 0.245
OBD2 STAT CA———————
FRAME:184 TM: 84.6
ENG SPEED(RPM) 1967
COOLANT(°F) 225
O2S11(V) 0.315
O2S12(V) 0.285
OBD2 STAT CA———————
FRAME:185 TM: 85.1
ENG SPEED(RPM) 1964
COOLANT(°F) 225
O2S11(V) 0.145
O2S12(V) 0.300
OBD2 STAT CA———————
FRAME:186 TM: 85.6
ENG SPEED(RPM) 1967
COOLANT(°F) 223
O2S11(V) 0.155
O2S12(V) 0.400
OBD2 STAT CA———————
FRAME:187 TM: 86.0
ENG SPEED(RPM) 1985
COOLANT(°F) 223
O2S11(V) 0.135
O2S12(V) 0.415
OBD2 STAT CA———————
FRAME:188 TM: 86.5
ENG SPEED(RPM) 1979
COOLANT(°F) 223
O2S11(V) 0.135
O2S12(V) 0.440
OBD2 STAT CA———————
FRAME:189 TM: 87.0
ENG SPEED(RPM) 1958
COOLANT(°F) 223
O2S11(V) 0.150
O2S12(V) 0.490
OBD2 STAT CA———————
FRAME:190 TM: 87.4
ENG SPEED(RPM) 1979
COOLANT(°F) 223
O2S11(V) 0.130
O2S12(V) 0.405
OBD2 STAT CA———————
FRAME:191 TM: 87.9
ENG SPEED(RPM) 1973
COOLANT(°F) 223
O2S11(V) 0.165
O2S12(V) 0.525
OBD2 STAT CA———————
FRAME:192 TM: 88.4
ENG SPEED(RPM) 1955
COOLANT(°F) 223
O2S11(V) 0.305
O2S12(V) 0.510
OBD2 STAT CA———————
FRAME:193 TM: 88.9
ENG SPEED(RPM) 1955
COOLANT(°F) 223
O2S11(V) 0.310
O2S12(V) 0.420
OBD2 STAT CA———————
FRAME:194 TM: 89.3
ENG SPEED(RPM) 1973
COOLANT(°F) 223
O2S11(V) 0.675
O2S12(V) 0.455
OBD2 STAT CA———————
FRAME:195 TM: 89.8
ENG SPEED(RPM) 1958
COOLANT(°F) 221
O2S11(V) 0.705
O2S12(V) 0.450
OBD2 STAT CA———————
FRAME:196 TM: 90.2
ENG SPEED(RPM) 1961
COOLANT(°F) 223
O2S11(V) 0.415
O2S12(V) 0.390
OBD2 STAT CA———————
FRAME:197 TM: 90.7
ENG SPEED(RPM) 1964
COOLANT(°F) 221
O2S11(V) 0.150
O2S12(V) 0.300
OBD2 STAT CA———————
FRAME:198 TM: 91.1
ENG SPEED(RPM) 1964
COOLANT(°F) 221
O2S11(V) 0.165
O2S12(V) 0.340
OBD2 STAT CA———————
FRAME:199 TM: 91.6
ENG SPEED(RPM) 1967
COOLANT(°F) 221
O2S11(V) 0.420
O2S12(V) 0.555
OBD2 STAT CA———————
FRAME:200 TM: 92.1
ENG SPEED(RPM) 1958
COOLANT(°F) 221
O2S11(V) 0.690
O2S12(V) 0.365
OBD2 STAT CA———————
FRAME:201 TM: 92.5
ENG SPEED(RPM) 1964
COOLANT(°F) 221
O2S11(V) 0.660
O2S12(V) 0.410
OBD2 STAT CA———————
FRAME:202 TM: 93.0
ENG SPEED(RPM) 1888
COOLANT(°F) 221
O2S11(V) 0.070
O2S12(V) 0.565
OBD2 STAT CA———————
FRAME:203 TM: 93.7
ENG SPEED(RPM) 1180
COOLANT(°F) 221
O2S11(V) 0.050
O2S12(V) 0.140
OBD2 STAT CA=====================
View Freeze Data
Vehicle is not responding to freeze
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O2 Monitor Tests
O2 Bank1 Sensor1
RICH-LN Thresh
MOD $10
MAX —–(V)
MEAS 0.595(V)
MIN —–(V)LN-RICH Thresh
MOD $10
MAX —–(V)
MEAS 0.605(V)
MIN —–(V)Lo V for Switch
MOD $10
MAX —–(V)
MEAS 0.300(V)
MIN —–(V)Hi V for Switch
MOD $10
MAX —–(V)
MEAS 0.600(V)
MIN —–(V)RICH-LN Sw Time
MOD $10
MAX 0.11(s)
MEAS 0.00(s)
MIN 0.00(s)LN-RICH Sw Time
MOD $10
MAX 0.11(s)
MEAS 0.00(s)
MIN 0.00(s)Test $70
MOD $10
MAX 255
MEAS 0
MIN 40Test $71
MOD $10
MAX 255(counts)
MEAS 0(counts)
MIN 40(counts)Test $81
MOD $10
MAX 160
MEAS 0
MIN 16=====================
Vehicle Information
Vehicle information not available on
this vehicle.=====================
Modules Present
Module $10: VPW
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Those engines are well known for blowing their intake gaskets. Since it’s barely leaking, now’s the time to do it. If it’s left it could eventually cause the oil and coolant to cross contaminate and kill the engine. Or if any oil gets inot the cooling system, the rubber will be quickly destroyed.
One of the easiest ways to troubleshoot a clogged cat, is to remove the O2 sensor and see if the engine runs better.
For a vacuum leak rev the engine while watching your fuel trims. If they drop when you rev it then you have a vacuum leak if it gets worse then you have a fuel delivery problem. The Cat can be bad and not be clogged. generally when your cat is clogged up the engine wont have very much power and in extreme cases the vehicle will barley move.
[quote=”ArmedsouthernEr” post=156352]For a vacuum leak rev the engine while watching your fuel trims. If they drop when you rev it then you have a vacuum leak if it gets worse then you have a fuel delivery problem. The Cat can be bad and not be clogged. generally when your cat is clogged up the engine wont have very much power and in extreme cases the vehicle will barley move.[/quote]
Fuel trims drop when rev’d. I kicked it up to about 2,500 rpms, and fuel trim dropped to -3.4.
I’m leaning to the intakes manifold gaskets. I’ll try the propane test and see if anything happens with that.
Thanks for answering.
[quote=”DaFirnz” post=156329]Those engines are well known for blowing their intake gaskets. Since it’s barely leaking, now’s the time to do it. If it’s left it could eventually cause the oil and coolant to cross contaminate and kill the engine. Or if any oil gets inot the cooling system, the rubber will be quickly destroyed.
One of the easiest ways to troubleshoot a clogged cat, is to remove the O2 sensor and see if the engine runs better.[/quote]
Have not found any dex-cool snot yet, oil looks ok. Had to pull the filter the other day to hook up a new battery cable.
I’ll pull the upstream O2 and see what happens.
Thanks for the advice.
OP says – I have an exhaust leak on the manifold at cylinder #1 and a P0171. The exhaust leak may skew the O2 sensor setting P0171.
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