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Hey everyone,
I have an 02 Monte Carlo with the 3400, and have a friend with an 05 Grand Am with the 3400, and both have a similar problem. Sometimes, with just the bump of the starter, they’re running. Other times, it takes a few startup attempts to get them running. One time the Grand Am just didn’t seem like it wanted to start and I thought we were gonna need a tow truck. I was just wondering, is there a well known common issue on these that causes this? Or is this just how they are?
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I would start by checking fuel pressure when starting. Look up the specs for your vehicles and note that many vehicles spec higher pressure when starting than when running.
When it has a difficult start, does it run perfectly as soon as it starts, or does it hesitate/stumble for a few seconds or a minute?
Do the hard starts happen when the weather is cold, or randomly?
When you have trouble you might try turning the ignition switch from off to on and back several times without starting to insure the fuel pump is primed. If it starts better the fuel pump may be weak or the check valve bad.
Sorry for taking so long to reply.
The cars run perfectly once started, and the issue seems to be pretty random. And the Chevy is MUCH less of a problem than the Grand Am. So I’m thinking the 3400’s must have had a common issue all along to cause this and it just got progressively worse with each model year. I’m just wondering if anyone knew what this issue might be, if its any one thing or if there’s a million different things it could be in each case. And neither vehicle has a CEL nor any DTCs in memory.
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