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1-9 of 9 Results
  1. Chevy C/K Truck Forum
    I have been having a lot of problems with my 1996 K3500 5.7l The truck has about 220K miles on it. I recently had problems with it running very rough. I found out I had low compression on two cylinders, So I decided to get a new Long Block. I replaced a lot of other parts with it. -Blackbear...
  2. GM Powertrain
    have a 2000 Silverado with a 5.3 and have a p0300. cylinders 1 & 8 are dead misfires at idle but when you get the rpms up the misfire moves and starts jumping around to all cylinders. have new plug wires and plugs have also had the injectors test and cleaned. tested wires from ecm to each...
  3. Chevy Silverado Forum (GMC Sierra)
    Hi all! Hopefully there is someone out there that can help me! I have a 2006 Silverado w/t 4.3L v6. I've been trying to diagnose a random / multiple misfire code for a few weeks now and have exhausted all my options (at least all that I know). The truck will start, run, drive, then randomly lose...
  4. Chevy Blazer Forum (GMC Jimmy)
    2000 blazer 4wd Got this code over a month ago. Started off by replacing the O2 sensors since they looked old. No change. Replaced a lot of bad vacuum tubing. Didn't change anything. Got a cheap but effective smoke machine. Found the upper plenum was leaking at the gasket. Replaced gasket and...
  5. Chevy Silverado Forum (GMC Sierra)
    New to the forum and at a loss. Starting with a 2000 Silverado 5.3 275k never had an issue till about 2 months ago..started witha couple hard starts..then subsequent engine light indicator. Put an obd on it and got a p0300 random misfire. Changed plugs and wires since they were probably due...
  6. Chevy S10 Forum (GMC Sonoma)
    Hello, I am having issues with my truck and I need help. I have a 1999 GMC Sonoma and it is misfiring bad. I was reduced to a part swapper and spent loads of $$ like an idiot to no avail. The truck has new spark plugs & wires, new injectors, injector harness and fuel filter, and I also put on a...
  7. Chevy Suburban Forum (GMC Yukon XL)
    So a few days ago I went to start up my car and it was running about as good as a beached whale running a triathlon. So i used my code reader and got 2 P0300 codes which is random multiple misfire. I looked up the causes and parts that could fail (most of the parts on my engine are original) and...
  8. Chevy Suburban Forum (GMC Yukon XL)
    Hey all, going to throw this out there out of desperation. I can tinker on vehicles but I am not a mechanic by any means. Getting the p0300 code for random miss. I have replaced all plugs, wires, and coils before figuring out this code is misfire on random cylinders, so probably fuel or an air...
  9. Chevy Silverado Forum (GMC Sierra)
    2008 Silverado 5.3 V8 with AFM with 180,000 miles Current issue is flashing check engine light with code p0300, snap-on scan tool reading missfires on cylinders 1, 2, 4, and 7 Before current issue the truck had slight lifter ticking sound and white smoke upon every start up which would go away...
1-9 of 9 Results
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