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1996 Silverado problems continued.
I currently have no code. However I took data on my scanner twice. The
truck sputtered and ran a little rough as soon as I left the driveway. It seem though the further I went it started to get better. Truck has had a catylist system efficiency below threshold for a number of months. I assumed it was a catalytic converter and would not be related. Truck has 342,000 miles. New plugs, wires, cap and rotor in April. Today I replaced Ignition control module and ignition coil. Ensured continuity with battery ground on the ICM harness. Ensured continuity on the white wire from computer to ICM. Problem started as what felt like "slipping" several weeks ago when leaving for work. Did not seem to be getting as many miles pertank either.) Never had that problem again for the rest of the day. This lasted for a few weeks. I put two bottles of fuel injection cleaner in tank and filled up tank. A few days later went out to start and took forever to start. Once did ran rough. Got the code P1351. Did above diagostics. Getting 6 colts to the ICM harness. (calls for 1-4 in book). Checked crank sensor. It is supposed to output "approximately" 5 volts but is outputting 4. Cleaned with a wire brush chasis ground. Code has not come back yet but I have not driven truck other than to do the data test a few minutes ago. (And still seem to be exhibiting problems). On a whim I checked fuel pressure. It was within specs at 64 psi. (Calls for 60-65). However, when turning the key off the pressure drops down a great deal. In 5 minutes it dropped 30 psi. I think my Haynes manual says this is abnormal but not sure. is the truck safe to drive to work? It seems to get better as it warms up but I dont want to get stranded. It is my daily driver and I dont know what to do. Here is the data I downloaded: Location #1 (Test 1) DTC-cnt 0 Fuel Sys 1 OL Fuel Sys 2 OL Load_PCT(%) 4.7 ETC (F) 108 Shrt Ft1 (%) -3.1 LongFt1(%) 0.0 Shrt FT2 (%) -3.9 LongFT2 (%) 0.0 MAP (in HG) 11.5 RPM (/min) 668 VSS (MPH) 0 Spark ADVC -19 IAT (F) 70 MAF (1b/min) 1.198 TP (%) 0.0 02sB1S12—B2S12— O2B1S2 (v) 0.230 SHRTFTB1S1 (%) -3.9 O2B1S2 (v) 0.340 O2B2S1 (V) 0.130 SHRT FT B2S1 (%) -5.5 O2B2S2 (v) 0.070 OBD OBD2 Location #2 (Test 2) DTC-cnt 0 Fuel Sys 1 CL Fuel Sys 2 CL Load_PCT(%) 17.6 ETC (F) 205 Shrt Ft1 (%) 1.6 LongFt1(%) 0.0 Shrt FT2 (%) 1.6 LongFT2 (%) 0.0 MAP (in HG) 26.6 RPM (/min) 1505 VSS (MPH) 41 Spark ADVC -15 IAT (F) 70 MAF (1b/min) 8.279 TP (%) 42.4 02sB1S12—B2S12— O2B1S2 (v) 0.100 SHRTFTB1S1 (%) 3.9 O2B1S2 (v) 0.670 O2B2S1 (V) 0.110 SHRT FT B2S1 (%) 3.1 O2B2S2 (v) 0.800 OBD OBD2 |
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