we have had the filter changed and the censor. It still starts some time and some time it won't. We have had the filter changed and the censor. They said the fuel pump is o.k. and do not need to be replaced. We are not hearing no noise. It may start in the afternoon but when going to work at 2:00 am it won't start. This happens all day long on and off on and off. This truck has been placed in the shop twice for repairs the mechanic thought what the issue was but it still doing the same thing. I just tried to start and it won't start.
What makes this problem better or worse?
It starts some time and some time it won't
How long has your 2004 GMC Sierra 1500 had this problem?
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Hi, this is Bo, an auto expert on RepairPal's Car Genius team!
Intermittent starting issues can be a real headache, especially when the problem likes to play hide-and-seek! Since the fuel pump has been cleared and the filter and sensor are new, let's turn our attention to some other common troublemakers. The ignition switch, starter relay, or even the battery connections could be the culprit. Sometimes a weak battery or loose cables can cause the truck to start only when it feels like it, especially in cooler early morning hours.
Another thing to consider is the crankshaft position sensor, which can cause no-start conditions if it’s failing intermittently. It might be worth testing or swapping it out. I’d also suggest checking for any trouble codes, even if the check engine light isn’t on, as they can give a clue about what's happening under the hood. Keep at it, and I hope this narrows things down for you!
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