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Starting issues

Truck won't start (sometimes)

Starting issues

Postby T-Bub65 [OP] » Oct 23 2012, 5:59am

I have an 04 silverado 5.3L that wont start sometimes. When I turn the key everything comes on but it wont turnover. After trying several times and sometimes using a different key it will crank up and usually not give any more problems for a few days, sometimes weeks. It started over a year ago and kept getting worse till someone told me it might be the security chip in the key. So I started using my extra key and no problems for almost a year. a couple months ago the problem came back so I went to the dealership to get a new key and they informed me that I don't have the security chip in it. I bought a new key and it helped but it still does it. I think it might be the ignition switch but I don't want to spend $100 if I'm not sure. I haven't had a chance to check anything with a meter because I never know when it will act up.
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Re: Starting issues

Postby masterem88 » Oct 24 2012, 12:21am

if all your accessories turn on in the run position and when you go to the start position and you dont hear anything, (starter solenoid click,starter start to engage, or anything) i would first think of ignition switch. but i would check power to the solenoid when this occurs to make sure its not an intermittent solenoid problem. ive only had a handful or 99-up chevy trucks with bad ignition switchs. but the 98-older were more than notorious for ignition switches not just starting but actually supplying power to accessories through switch. so if i was you i would remove plastic trim around steering column and check output voltage of ignition switch to verify.
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Re: Starting issues

Postby T-Bub65 [OP] » Oct 24 2012, 12:30am

I'm gonna try to check the output voltage next time it happens I just have know idea when it will be. I guess I'll just ride around with my steering column apart till then.
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Re: Starting issues

Postby DanR7985 » Oct 25 2012, 3:31am

I just had this problem with my 2003 4.8. I took it to a stealership and they replaced the passlock and the ignition switch and none of that fixed it. The main problem was that it would never throw a code so they had no idea what to do. I ended up taking it somewhere else and they said the starter was bad in one spot. If it tried from to start from the bad spot it would no crank no start, but if it was anywhere else in the starter it would work fine. They also said that the wire from the starter to the solenoid was corroded so bad that when you would try to start it you could visually see a spark. The mechanic said they have tried to start it 100 times and it worked every time. I also have been starting it and have not had any trouble.
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Re: Starting issues

Postby Frank Monchun » Nov 05 2012, 4:10am

Just had the same problem and after doing the Passlock bypass and checking everything else w/o any success I found that mice had made a nest in the engine fuse box and wet it enough to corrode the relays. Cleaned them up, cleaned the whole fuse box, and everything is running fine now. Glad I didn't replace the fuel pump or any other suggested fixes.
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Starting issues

Postby Machster69 » Nov 05 2012, 2:17pm

Well Frank, you should never start changing parts without a diagnosis on that part. Ie: You shouldnt buy a fuel pump without verifying the circuit is open when its to be closed or pressures are not meeting spec...
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