[mustang_man_55]

problems starting even after battery and alternator change. All the cables are new and the starter appears to be good. No other noticeable issues with charging system. Gauge reads 14 volts. Help!

[akm]

probably your starter. does it sound weak? like its trying hard to start?

[mustang_man_55]

starter sounds fine once it has enough power to turn it

[hiimed]

Does it start easier when it's cold?

[mustang_man_55]

I'm in Phoenix, Arizona. This time of year our lows are only in the high 70's. It has had a problem right after shutting off and after setting all night. I have now pulled the starter and it checks out fine as do the cables. Any ideas?

[302 Z28]

Just a comment on a problem my wife's Tahoe had that drove me nuts for a couple of months. Her Tahoe would just quit while slowing down for a stop light or sign. It would not crank the first or second time you tried to restart it, but it eventually would. We have an alarm system on it that controls the door locks and a starter interupt. When it would quit the door locks would go up and down and the alarm would arm-disarm. Then the starter interupt would kick in and would not allow a restart until the alarm had been reset. Naturally I suspected the alarm system, and disconnected it as a test. My wife took of in the Tahoe and about 10 minutes later called me on her cell phone to tell me it died again, but restarted. I have to add that I never witnessed the problem. Well one Sunday morning as we were leaving for churh we got in the Tahoe and it was completely dead, nothing worked, no lights, nothing. I left the key in the on position and pulled the hood release. When I pulled the hood release everything started working. I raised the hood and started looking for something. Finding nothing glaringly wrong, I slammed the hood down and everything quit again. What it turned out to be was, the Tahoe has two positive battery cables on the positive battery post. They are stacked on top of each other with a long battery bolt. Tightening the bolt eliminated the problem for about a month. Next time it happend I was driving it. I exited the vehicle, raised the hood and giggled the positive battery cable, restarted and drove home. Upon completely removing the two positive battery cables I discovered a large abount of corrosion between the two cable ends were they layed on top of each other. I completely cleaned the contact points and reassembled the cables to the battery. It has been fine ever since.

I'm not saying this is your problem, just saying don't take it for granted that your cables are OK and you have a good contact at the battery. Check it closely and take nothing for granted.

Vince

[dave0002]

you might want to check out your main relay... the small amount of current from turning your key trips a relay making everything happen... likely a double action relay that should ctrl fuel/air mix, O2 sensor and everything right down to your fuel pump... this would explain why your alternator and starter are going strong but it won't start... it's probably cranking w spark but no fuel...
sometimes the coil on the relay will get stuck [especially in high heat situations like turning the car off to refuel then trying to start] and this could be causing intermittant starting problems...

just a guess... check this out w someone who knows more about the setup gm is running these days and see if this could be the problem...

regardless, hope it helped...