Forum: Diagnostics & Troubleshooting

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...

I just bought a nice 01` shortbed with 200k seems to run ok but has a shake in engine po300 code and po308 put new plugs and wires ,switched coil...

I have a 99 4,8 silverado that has a check engine light that I think was thrown when I installed long tube headers on the truck , I have no cats and...

127xxx, runs great. Just got it 3 weeks ago. Took it straight to oriellys and ran codes, co265,po171 po300, po420,po442,po446,po174. I replaced power...

Hi every one I am having trouble figuring this one out. The problem I am having is weird. The truck runs fine at start up. Then after I drive for a...

so I posted a thread a while back about having some overheating issues when towing my new to me boat and still have not resolved the issue. I still...

127xxx, runs great. Just got it 3 weeks ago. Took it straight to oriellys and ran codes, co265,po171 po300, po420,po442,po446,po174. I replaced power...

fresh install crate LSA in a 94 chevy 1/2ton....the throttle quit working (drive by wire), wiring is good, any idea on how to decide whether it's ...

I have a 95 c1500 with an 01 4.8 and 4l60e (both from same donor vehicle, trans is new but spec'd for donor truck. My first issue is coolant temp...

I've had my truck swapped with a h/c/i 5.3 for a while now and have driven it everywhere with no real issues....aside from these 2 and I've had...