Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
2004 trailblazer no crank, intermittent, gauges jump and dash lights flicker when problem is present.
[SY1]You do not need these dots.
I am sorry you are having problems. First things first. Check the battery cables at the battery posts to make sure they are very clean and very tight. Check the negative battery cable where it attaches to the engine to make sure it is clean and tight. Check the large cable to the alternator to make sure itsit is tight.Then check the cable to the starter to make sure it is clean and tight.
Do you have a voltmeter available?
Ok good. First lets check the battery voltage with the car not running. should be no less than 12.5 vdc.
Voltage seems ok what is the next step?
Ok, now with the voltmeter still connected to the battery, monitor it while cranking the engine. It should not go below 9.7 volts.
Okay, the truck will not spin over now, it is intermittent, and yesterday it would spin but not crank today and no spin.
any clicking? tapping? any noise?
There is no noise but speedometer needle will raise up and stick also rpm needle etc, jump bounce erratically sometimes.
I haven't tried that yet, what would that be an indicator of?
If it would happen to crank, then it would indicate that your battery cranking amps are dissipated.The battery voltage can be good, but cranking amps may be shot. If it still is not doing anything after this, then the ignition switch will need to be replaced. I have seen this a lot (intermittent operation). I was just trying to eliminate all the basic electrical stuff first and save you some money, but that is what the problem is going to be.
battery voltage can be good, but cranking amps can be shot
it it still isnt doing anything after this, then the ignition switch will need replaced. seen this alot( intermittent operation). i was just trying to eliminate all the basic electrical stuff first and save you some money. but thats what the problem is going to be
keep me posted. thanks
hi could you give me a link to this part maybe? i have shopped off of ebay many times if this is an acceptable place...
sure, give me a sec
once you installed the iginition switch, you will need to have a new key made and coded at the dealer so the computer recognizes the new key. just call the local gm dealer parts department and they will tell you what you need to bring them i.e. vin etc....
ok i thought the switch was separate from the key cylinder, is this not right
it is. but they key cylinder goes through the switch.
ok how much are these keys usually
it has to be cut to they ignition switch, so the computer recognizes that its cut correctly.... not really coded.
no numbers off the switch. you have to go to the dealer and have them cut a new key. they will need the vin. you replaced the cylinder too right?
does it start?
is it cranking?
when you say spin, what do you mean?
so its cranking... but not turning over
in other words its trying to start but not starting?
ok...you had me confused this whole time. we have to check for spark, if thats good then wneed to check for fuel. before all of that, sitting in the truck, turn the key to the "on" position and listen to see if you can hear the fuel pump running for a few seconds.
can`you hear the fuel pump running?
ok. if you pull the starter relay. put a voltmeter in each slot(with the key to the "on" position to find where there is 12 volts. there should be 2 slots with 12 volts and 2 slot with 0 volts.