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03-11-2013, 10:43 PM #1194 Chevrolet K1500 4x4. 5.7L 350, 5-speed (AKA Betty) Or Rust Bucket...depends on if I'm mad at her.
03-12-2013, 01:13 PM #12
got to be external,right?besides dizzy swap,check power supply at dizzy,thinking fusible link?try wiggle test,and at starter too,any wire with expanded insul,i.e. either side of links,low volts to dizzy make for many diff. situations,keep me informed
03-13-2013, 10:07 PM #13
I was talking with a couple of the mechanics as were I work and each of them said Dizzy. I went ahead and installed the 305 dizzy, hooked it back up and ran it down the road. Ran fine, but sadly still back fires. I mean it's not like it causes any problems with the way it runs. Honestly even when I'm driving along at 70MPH, it's doing it every 3 seconds without a single variance in time between back fires, despite that it has no lag in forward momentum. Doesn't stop moving, hesitate or in anyway impede the trucks acceleration. It's just annoying and embarrassing. Oddly, doesn't do it at all under hard acceleration. Go balls to the wall in 4th gear at 60-75MPH and it doesn't do nothing. Throw it in 5th. *pop pop* I'll take a look at the wiring this weekend, though I'm sure all of that is fine :/ *sigh* I love chevys to death. I'd rather push a chevy then drive a ford. But that love ain't mutual it seems XD Also on the replacement dizzy I went ahead and used it's rotor, cap and ingnition module just to check if the originals I had were faulty. No change their either.
03-14-2013, 04:32 AM #14
Had a 87 cavalier that would missfire under a steady light load and clear up under moderate to heavy accelleration. Turned out to be a leaking EGR valve.2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear
03-14-2013, 06:10 AM #15
This one only does it under casual driving, up to moderate acceleration *depending upon which gear it's in* Doesn't ever under heavy. I replaced the vacuum advance on it last week or so as a last resort if that's what the EGR is, round black thing with a vacuum hose on it. Lol I usually don't know the name of every part, but I usually know what it does at least. The vacuum line on it is new as well. Now maybe the sensor it goes to is bad? I was looking at it here yesterday comparing it to another I have. It's not the one with a filter like this http://contentinfo.autozone.com/znet.../EVS3/image/4/ It's different. Don't know if that bothers anything.
05-10-2013, 08:34 PM #16
Finally resolved the problem. Wasn't the motor at all. Turned out it was the transfer case. The chain inside was busted and rattling and catching on stuff. Changed it out, haven't had a problem yet so far. Truck has no muffler and the I cut a hole in what's left of the pipe in front of the converter, so it's hard to tell where sounds are coming from over the roaring of the motor. Running alright so far (better stay that way to, the motor is all brand new by now lol)
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