I've been having problems starting my trailblazer sometimes the engine will turn but it like it won't catch. I have to turn the ignition several times before the engine turns completly over. But it seems like the ignition is causing a delay I can turn the key but it a few second delay before the engine will actually respond???
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Usually a stalling problem in hot weather is caused by an electrical part getting overheated such as a coil or a relay, or a fuel problem. I doubt the O2 sensor would cause it to stall that quick. And if a sensor fails it should turn on the warning light. You might want to have the computer scanned for codes even tho the light has not come on. How many times do you have to start it before it keeps running ? Will it stay running if you open the throttle ?
When you say it won't start, do you mean it cranks but won't fire, or it just won't crank? If it just won't crank, you could be having an issue with the starter relay. The often become intermittent before failure. Many owners do not know there is a starter relay because it was added as a recall item i order to protect the iginition switch from burnout. The starter relay is located in the very front of the engine compartment, just to the left of the battery, on the back side of the radiator crossmember.
It sounds like your brake powerbooster is going out. If it has a vacuum leak or a seal that is bad it will loose the boost part of the brakes and basically comes to manual braking. It sounds as if the seal behind the diaphram, the side closest to the driver is bad allowing the vacuum from the engine to basically put the brakes on. Good luck and let me know.
Have you had the battery changed since you had the car. Have that checked for a full charge and no dead cells. Always have the air-conditioning completely off when starting the car. The starter takes a lot of amps to turn over and having the AC on doesn't help.
and another reason is the code didn't clear out completely. this tool can help you test the code.
YOU MAY HAVE A BAD DOOR AJAR SWITCH. HOWEVER, YO HAVE A TIMER THAT SHUTS OFF THE INTERIOR LIGHTS AFTER 300 MINUTES. IT'S CALLED A BATTERY SAVER FEATURE. TEST IT OUT.
THE EXTENDED CRANK MAY BE A CHECK VALVE IN THE FUEL PUMP IN THE TANK, ALLOWING PRESSURE TO DROP WHEN YOU TURN THE ENGINE OFF.
OR A BAD FUEL PRESSURE REGULATOR ON THE ENGIEN FUEL RAIL.
TRY THIS TEST, TURN KEY TO "ON" POSITION, WAIT 5 SECONDS, SHUT OFF KEY FOR 30 SECONDS. TURN KEY ON, WAIT 5 SECONDS, THEN START ENGINE. IF IT STARTS RIGHT UP, YOU ARE LOSING FUEL PRESSURE WITH ENGINE OFF.
THIS BUILDS UP PRESSURE IF IT DROPPED DURING SHUT DOWN.
REPORT TEST RESULTS.