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    1997 C1500 P0307 Misfire

    Leak down test resulted in less than 5% on cyl 7 same on cyl 5. I checked valve train and noticed the exhaust was tight. Loosened about 1/8 turn. In the process of swapping plugs I noticed #7 had oil/fuel seeping around the metal and outer ceramic insulator. I snapped the plug and noticed what...
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    1997 C1500 P0307 Misfire

    Thank you Shurkey. I have a free weekend to do the leak down test and inspect the valve train to make sure the valves are opening. I’ve swapped plugs with no change to the misfires. I got plugs from the ebay seller in TX as well. I suspect they were fake AC Delco. Every plug was equally...
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    1997 C1500 P0307 Misfire

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    1997 C1500 P0307 Misfire

    I know another misfire thread… lots of details I could use some help with my truck that has had a history of misfires that I have always been able to resolve, with the experience from GMT400 owners from this site. I’ve followed the factory service manual to diagnose the misfires. Found several...
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    98 5.7 fuel pump intermittent no prime / dies while driving

    I have had the same issues you described twice. Both had separate causes. This first time it was the wiring harness from the Crank position sensor shorting to the block. The scan tool did not have any codes. My mechanic noticed intermittent signals coming from the CPS during a test drive...
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    Threw a Rod. How can this happen in 2023

    Agree with this 100%. My BIL and I swapped a crate motor into my 97 c1500 over a weekend… it could have been done inside of 8 hours but my sister made him go to her friends wedding on Saturday LOL. The bigger PITA was replacing the motor mounts. Had to R&R the lower control arms to access the...
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    At my wits end.. Looking for any idea.

    I have had this happen twice with my 97 vortec truck... different fuel and cpu systems but may have some similarities. First time was the wiring harness going to the crank sensor shorting to the block. This tool several trips to the dealer to resolve. The second time I had just completed a tune...
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    Sun visor replacement for 1997 GM truck ... options?

    I adapted a set of early 2000’s Astro visors with Vanity, Primary swivel visor and a secondary front flip down visor to my 97 silverado. Had to redrill the mounting holes but other wise fit well, grey cloth even matched my interior.
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    Crack in head, can it be reused.

    I was in your boat about ten years ago. Overheated my 97 Vortec and cracked both heads(cyl 5&6 between the valves IIRC) at 215k. Dealer wanted $1800 to replace the heads. I found a GM long block crate motor for $1600 shipped with the 3year warranty and installed it myself for ~$2000 including...
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    Salvage yard recommends

    Hwy 67 Truck Dismantlers 12650 CA-67, Lakeside, CA 92040 67truck.com I helped a friend re-cab a rusted out 76. Good prices, clean as a salvage yard can be. They let us walk the yard to pick out a cab. Pulled it for us to pick up the next day and loaded it. Cheap too; clean, straight and rust...
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    New Dorman and Cardone master cylinders

    Alternative to the GMT800 master is the master used for the somewhat rare 2000 GMT400 2WD Tahoe SS, also used on LEO Tahoes. AC Delco part number 174-722 GM Part number 18029968 It will provide a firmer pedal by increasing pressure to the rear brakes. Bolts right up with no adapters, works...
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    vortec with occasional stumble

    I think you have two issues. Fuel pressure dropping to 45psi may cause the rough stumble you described. CMP retard should be 0* +-2*. 10* or more will throw a P1345 code. If you have over 100k Miles your distributor gear is likely worn and the distributor(cam position sensor) is not holding...
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    Need a pro to Diagnose

    Sounds like bad timing caused by a worn or improperly positioned distributor... could also be caused by worn timing chain. I would check the distributor first. My 1997 vortec backfired and failed to start, as you describe, when my distributor(actually a cam position sensor since the cpu controls...
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    98 c2500 suspension problems HELP PLS!

    You may need ball joint spacers to correct the camber. That's what the alignment shop recommended for my c1500 with 2" coil spacer lift. Mine is within spec but just barely. I replaced every suspension component at the time I installed the coil spacers and still have the camber problem. My tires...
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    rebuilding stock vortec heads

    Sounds like a good plan. Don’t forget the torque angle gauge to final torque the head bolts. I picked mine up last minute at the Zone. FWIW: I grew up near Guthrie, Ok. My brother took my 218k Vortec short block and dropped it into his Cabellero with Summit Vortec heads, edelbrock intake and...
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    rebuilding stock vortec heads

    Word of advice. Get the heads magnafluxed before you install the new parts! It should not cost you more than $50 if you disassemble and clean the heads before having them magnafluxed. Also have the machine shop check your valve guides for wear it’s a good time to have those replaced if they are...
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    Is their a way to get Transmission Temps from a OBD2 port

    Works for my 97 C1500 as well. Bonus: Dashcommand does Cam Retard Cmp offset. That alone is worth the cost of the adapter and app.
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    Still chasing why my truck keeps dying

    Sounds like you got it fixed. I just wanted to share that I had a very similar issue with all the same symptoms except my shift interlock was not clicking and I had an additional symptom, the engine would shut down while driving... no code. This went on for some time, GM tech finally found the...

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