Trailblazer won't start

Ju1nito · #1 10-05-2006, 11:38 AM

I have an 02 tblzr when i run it for less than 10 minutes and turn it off it will not re-start right of way it truns but won't start. any ideas what may be the cause?

rodeo02 · #2 10-05-2006, 12:37 PM

So the starter does crank the engine over, but the engine wont fire? Any SES light? At a blind guess, I'd suspect maybe a failling fuel pump?

Joel

Ju1nito · #3 10-05-2006, 01:01 PM

Had the pump tested by the dealer and they cleaned the injectors and throtlebody and still having the same issue. and no SES lights

rodeo02 · #4 10-05-2006, 02:13 PM

Have you tried leaving the key to 'run' (dont start the engine) for ~10sec prior to starting to see if it starts quicker then? That would indicate the fuel rail is loosing prime w/ the engine off. Usually that's a bad fuel pressure regulator.

Joel

Ju1nito · #5 10-06-2006, 08:25 AM

I gave it a try but didn't work. i noticed that when it's turning if i press on the gas pedal it tries to start but it hesitates.

maxwedge · #6 10-06-2006, 08:40 AM

Quote:

Originally Posted by Ju1nito

I gave it a try but didn't work. i noticed that when it's turning if i press on the gas pedal it tries to start but it hesitates.

This issue requires a full scan during the event to look at injector pulse, tps and iac settings and fuel pressure test all together to see what is happening at the time this occurs.

Ju1nito · #7 10-06-2006, 08:56 AM

Quote:

Originally Posted by maxwedge

This issue requires a full scan during the event to look at injector pulse, tps and iac settings and fuel pressure test all together to see what is happening at the time this occurs.

I had it scanned and the dealer siad it cleared all error codes and re-programed it , what ever that means and still nothing they told me they don't know what the cause is.

rodeo02 · #8 10-06-2006, 11:04 AM

It might be to your advantage to try another dealer or an independant shop. As far as troubleshooting it here, the more detail you can post, the better the chance at solving this. How does the truck run? any changes in performance or fuel economy? Do you have an aftermarket remote start or alarm system? No SES makes this tough. An ignition coil, sparkplug or throttle by wire issue will usually store a code. There is no idle air control with the electronic throttle control, the PCM actuates the throttle per software. I'd check for fuel pressure in the fuel rail prior to restart when the problem most occurs. I'd have to poke around for the location, but you will have a shraeder valve (test port) on the fuel rail to test for this.

Joel

Ju1nito · #9 10-06-2006, 11:41 AM

Quote:

Originally Posted by rodeo02

It might be to your advantage to try another dealer or an independant shop. As far as troubleshooting it here, the more detail you can post, the better the chance at solving this. How does the truck run? any changes in performance or fuel economy? Do you have an aftermarket remote start or alarm system? No SES makes this tough. An ignition coil, sparkplug or throttle by wire issue will usually store a code. There is no idle air control with the electronic throttle control, the PCM actuates the throttle per software. I'd check for fuel pressure in the fuel rail prior to restart when the problem most occurs. I'd have to poke around for the location, but you will have a shraeder valve (test port) on the fuel rail to test for this.

Joel

I will probably try another dealer . another thing this never happens when it seats over night. it starts right away I've also noticed that the truck is starting to shake when cold can this be that it needs new spak plug even though it you're not to replace them untill 100K i have 80K on it now.

maxwedge · #10 10-06-2006, 03:45 PM

Quote:

Originally Posted by Ju1nito

I will probably try another dealer . another thing this never happens when it seats over night. it starts right away I've also noticed that the truck is starting to shake when cold can this be that it needs new spak plug even though it you're not to replace them untill 100K i have 80K on it now.

What were the codes they cleared, any record of them?

Ju1nito · #11 10-09-2006, 03:43 PM

Quote:

Originally Posted by maxwedge

What were the codes they cleared, any record of them?

I'll try to find them, Any idea why the truck shakes when cold? should i replace the sparkplugs?

maxwedge · #12 10-09-2006, 06:41 PM

Wait till you get the codes, too many possibilities here.

jozuah · #13 10-10-2006, 10:40 AM

i have had alot of experiance with the 4.3 V6's and the fuel system, the cause that you explain is a bad fuel pump. checks out fine at the dealer when a guage is put on but you get it home and a nostart arises. its the fuel pump. conditions that you experiance are ....
* starts fine in the morning after sitting all night.
*the first nostart conditon you had was after fueling the truck with less than a 1/4 tank.
*the vehicle will run on carb cleaner **** CAUTION dont try this unless you know what your doing can cause fire and cat damage*****
* dealer says they cant find anything wrong.

have changed about adozen of these pump with exactly what i just described and it fixed it everytime.
will it fix yours. we can only hope. and if it dosent then you have a new fuelpump module installed.
Josh.

Ju1nito · #14 10-10-2006, 03:25 PM

Quote:

Originally Posted by jozuah

i have had alot of experiance with the 4.3 V6's and the fuel system, the cause that you explain is a bad fuel pump. checks out fine at the dealer when a guage is put on but you get it home and a nostart arises. its the fuel pump. conditions that you experiance are ....
* starts fine in the morning after sitting all night.
*the first nostart conditon you had was after fueling the truck with less than a 1/4 tank.
*the vehicle will run on carb cleaner **** CAUTION dont try this unless you know what your doing can cause fire and cat damage*****
* dealer says they cant find anything wrong.

have changed about adozen of these pump with exactly what i just described and it fixed it everytime.
will it fix yours. we can only hope. and if it dosent then you have a new fuelpump module installed.
Josh.

If it is the pump why doesn't it fail when driving the truck? how much to replace it? and my temp. guage jumps back and forth from 110 to 210 and then drops back to 110 any suggestion on why the eratic readings, dealer said they don't know what can cause this...

ponchonutty · #15 10-12-2006, 10:43 AM

jozah, this is not the 4.3 we're looking at here.

have you noticed the security light coming on or flashing while starting or driving?

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