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**hatzie** · 05-31-2019, 09:22 AM

When I first brought my 2005 home it would do this intermittently. It had some pending misfire codes after an extended cranking session... Extended being 5-8 seconds rather than instant fire.
I changed the spark plugs and wires with OEM Delphi wires and AC Delco platinum plugs.
I also changed the oil in the whole driveline along with the air and oil filters.
The oil pressure came up to the centre mark and stopped regardless of engine RPM. After the oil and filter was changed the gauge reacted to RPM changes and the pressure came up a bit faster.

For the 8.1L 496
I'd use the NGK TR55GP Platinum plugs or AC Delco 19299585 Platinum plugs. Delco plugs are still my first choice but NGK are high quality plugs as well. Iridium plugs aren't recommended for the engines in the GMT800 rigs.
Denso 6718064 plug wires. Delphi doesn't make 496 wire sets and the AC Delco wires are low quality made in China now.

05-31-2019, 09:22 AM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,916	Re: Hard starting '01 8.1L When I first brought my 2005 home it would do this intermittently. It had some pending misfire codes after an extended cranking session... Extended being 5-8 seconds rather than instant fire. I changed the spark plugs and wires with OEM Delphi wires and AC Delco platinum plugs. I also changed the oil in the whole driveline along with the air and oil filters. The oil pressure came up to the centre mark and stopped regardless of engine RPM. After the oil and filter was changed the gauge reacted to RPM changes and the pressure came up a bit faster. For the 8.1L 496 I'd use the NGK TR55GP Platinum plugs or AC Delco 19299585 Platinum plugs. Delco plugs are still my first choice but NGK are high quality plugs as well. Iridium plugs aren't recommended for the engines in the GMT800 rigs. Denso 6718064 plug wires. Delphi doesn't make 496 wire sets and the AC Delco wires are low quality made in China now. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 05-31-2019 at 07:15 PM.