Forum: Diagnostics & Troubleshooting

Hey guys been away a long time. We got finished rebuilding the LQ4 in my son’s ‘99 Silvy 2500. when I say rebuild, it was a FULL rebuild including...

I have an 08 silverado the dod ate a lifter so I decided to swap out the 5,3 for a lo mile 6.2 with a small btr cam .The truck ran for a few days...

I have been trying to track down a "Multiple Random Misfires" code P0300 since I got my truck a month ago, ignition is all new(does have upgraded...

Yes, I've searched and couldn't find a suitable thread, so here goes: My fuel pressure is reading 72 psi at idle and I need to know how to get it...

can the steam line on 5.3 hook up to over flow on radiator

I’m helping a friend with an ls swap in a 93 truck. The engine will fire up and run fairly well but when you switch the key off the engine keeps...

Hi all! New to the forum! I think this is the right spot to post a question regarding my 2015 Sierra 6.0 vortec? I have the L96 engine with VVT...

2000 Silverado 5.3L 2WD 1500 RCSB w/ ~165Kmi - all stock Fuel pressure still just under spec after new pump and more... I replaced the fuel pump...

Finally got my 4.8l Vortec conversion to start - but it will absolutely not idle and dies unless I keep foot on the throttle. Getting a strange IAT...

My 05 Silverado is throwing codes P0120, U0107, P0220, P0446, P1516 Have replaced throttle position sensor and wiring harness. Ran good for a few...

I purchased a '93 C1500 with a '00 4.8L Vortec conversion earlier this year. Put about 5000 miles on it and it died in the driveway last week. ...

I need some input on a spark knock issue under light acceleration for my 2003 4.8, manual trans silverado. Went to 89 octane. Changed PCV, plugs,...

so let me start out with what i have so my truck was already swapped with a lq4 and 4l60 so im in the process of swapping this 416ci and 4l80 combo...

I have a 2005 Silverado 4.8 I recently bought, and it has a mis on cyl 7. Replaced plugs, wires, and coil on cyl 7. Still miss's, checked spark...

Still having issues with mine cold starting, so I changed the fuel pressure regulator and now I have this buzzing/vibrating sound?

New guy here, of course with a problem... I have a 2000 Silverado 1500 ECSB that had a 4.8 and MG5 5-speed. At 252k on the clock it was time to...

My truck can’t go any faster than 35 m/h it switches first and second gear but doesn’t switch to third gear the speedometer works good the reverse...

96 chevy SBSC with L31R I have performed the repin for the 0411 per the spreadsheet from Lextech. I just got my flash/tune from Blackbear, and am...

Ok guys, I have an 05 Tahoe that has about 6k on it since rebuild. About two weeks ago I got a stumble while driving in town and the dreaded...

Helpppp.! I have a 1994 c1500/k1500 EFI converted to carburetor 305 short box stepside Frankenstein.. i recently noticed a shit ton of white smoke...