Trailblazer won't start

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?

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

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

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

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.

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.

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.

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

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.

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?

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?

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

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.

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...

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?

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?

No! no lights flashing.

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?
change the fuel pump.
K. I. S. S.

change the fuel pump.
K. I. S. S.
First it was the 4.3 issue, now it is change the fuel pump with no concrete reason or testing, slow down here , please.

Im not overstating this diag. this will be a phantom, always is , im simply stating that sometimes experiance will overcome testing that will not provide results.
i feel strongly that if the fuelpump module is changed the problem will go away.
the 4.3 refferance could have been a 3.1L 3.3L 2.8L or any other engine that is having this same problem.
I called the shop i used to work at and asked about this and after looking back there has been over 20 vehicles that were towed in after fueling below 1/4 tank this problem shows up. (simple to find data on since we are one of the only towers thee area that tow for this particular gas station and is is also a Napa Auto Care Center) alot of models of gm and ford product that a fuel pump change fixed the exact problem thats being described here in this post.

if i am still out of line please let me know how i should go about posting a reply to a blind intermittent no-start condition.

Well, then if it indeed is a fuel problem the easiest thing would be to check the pressure at the fuel rail when it won't start.

Well, then if it indeed is a fuel problem the easiest thing would be to check the pressure at the fuel rail when it won't start.

yes that would be the thing to do.

in your last post you said this isint a 4.3 we are dealing with, yor right , but be aware, vortec engines across the board are picky on fuel pressure, wo if you have a gauge that reads 63 pounds and it wont start and your manual says 64 pounds, it could still be the fuel pump.
this isnt car audio its hydrodynamic forces at play.

i wish the best for your TB no one wants to have a no-start.

josh

yes that would be the thing to do.

in your last post you said this isint a 4.3 we are dealing with, yor right , but be aware, vortec engines across the board are picky on fuel pressure, wo if you have a gauge that reads 63 pounds and it wont start and your manual says 64 pounds, it could still be the fuel pump.
this isnt car audio its hydrodynamic forces at play.

i wish the best for your TB no one wants to have a no-start.

josh
My suggestion here to eliminate the pump issue is both a fp test and/or spray carb cleaner into the intake see if it starts, but there still could be an intermittent problem with no injector pulse, these are all basic diagnostic steps.

My suggestion here to eliminate the pump issue is both a fp test and/or spray carb cleaner into the intake see if it starts, but there still could be an intermittent problem with no injector pulse, these are all basic diagnostic steps.

When it doesn't start i press the gas pedal to the floor ( i don't pump it) and it starts right of way

Did you get this figured out?

When it doesn't start i press the gas pedal to the floor ( i don't pump it) and it starts right of way

Really? That's odd. Most throttle by wire equipped engines will keep the fuel injectors from firing if the acellerator pedal is floored while trying to start the engine. I confirmed this with my 2005. It will crank but not start with pedal input. Although, the 2005+ 4.2's do have a different fuel system.

Joel

Well, he could have an injector that's bad and is spraying a lot of fuel in.

Well, he could have an injector that's bad and is spraying a lot of fuel in.

I've also have heavy engine vibration when the truck is in drive with my foot on the brake, could this be the motor mounts???

I've also have heavy engine vibration when the truck is in drive with my foot on the brake, could this be the motor mounts???
Start a new thread here, this is unrelated.

Did he fix it?? This is the stuff that irks me... starts a thread on troubleshooting and then no replys to what fixed it..makes these type of forums useless.:banghead:

Did he fix it?? This is the stuff that irks me... starts a thread on troubleshooting and then no replys to what fixed it..makes these type of forums useless.:banghead:
I'd go easy on the useless, speaking for myself here, I spend 2 hours a day in general to help out using 40 years experience, but we have no control over the type of people that come here and the lack of follow up on their part. In general this is not the case though.

I'd go easy on the useless, speaking for myself here, I spend 2 hours a day in general to help out using 40 years experience, but we have no control over the type of people that come here and the lack of follow up on their part. In general this is not the case though.


Maxwedge, you are truly an asset to this site :) I've read your posts over in the GMC forum. Little did I know you spread yourself all over the place. I checked the Pontiac Bonneville forum and you were over there too (recognized your signature picture). Your input is appreciated and definately very important to this site. Just wanted to let you know that.

I'd go easy on the useless, speaking for myself here, I spend 2 hours a day in general to help out using 40 years experience, but we have no control over the type of people that come here and the lack of follow up on their part. In general this is not the case though.

I know..I know.. it won't do any good, but hopefully some will get the message to practice common courtesy to show some appreciation for people, like yourself, for taking their time and using thier experience in helping out. It ,in turn,helps others. I read through the old and new threads,just to get an Idea of what I may be coming across later on with my TB. So far,it has done us well. Now,to get this Check eng. light prob. taken care of... that's another post,after I read them all , hopefully I'll figure it out.:)

Starting System - Engine No Start/No Crank Condition

Bulletin No.: 02-06-04-015A

Date: March 07, 2006

TECHNICAL

Subject:
Intermittent No Crank, No Start (Clean Battery Side Terminal Stripped Threads, Replace Battery Cable Bolt)

Models:
2001-2007 GM Passenger Cars and Light-Duty Trucks (Including Saturn)
2003-2007 HUMMER H2
2006-2007 HUMMER H3
2005-2007 Saab 9-7X

with Side-Mounted Battery Terminals

Supercede:

This bulletin is being revised to update the models and provide a new labor operation number for this repair. Please discard Corporate Bulletin Numbers 02-06-04-015 and 03-06-03-006A (Section 06 - Engine/Propulsion System).

Condition

Some customers may comment on an intermittent no crank, no start condition.

Cause

This condition may be due to poor battery cable connections. Cross-threaded/stripped battery cable bolts inside the battery side post terminals may cause poor battery cable connections.

Correction

To avoid replacing the battery , do the following steps:

^ Clean the threads in the battery side post terminals using a 3/8" (# 16) NC bottom tap.

^ Replace the battery cable bolt.


The battery cable bolt is serviced separately from the cable and is available from your Parts Department. Be sure to use the correct bolt.

Warranty Information





For vehicles repaired under warranty, use the table.

Warranty Information (Saab U.S. Models)





For vehicles repaired under warranty, use the table.



This fixed my problem w/ the "no start" I bought the battery posts from advanced for like 2 dollars so its a cheap and quick fix. Now if I could just get my headlight to stop flickering!

I have the same exact problem as the orginal post. also my ECT sensor goes back and fourth like its a bad connection or something. please let me know what fixes it if you find out. it is very annoying thanks everyone

This is a 2 year old dead thread, please start a new one per forum rules, thanks.