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Stalling and hard to start

Tiny
1042549
  • MEMBER
  • 2005 CHEVROLET TRAILBLAZER
  • 4.1L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 145,000 MILES
Replacing ECM, do I have to relearn the crankshaft position sensor? I was all ready to replace the ECM when I came across this information. I only have a actron 9600 tool, I do not think I can relearn the cps with it. My ECM has already been flash program.
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Saturday, May 14th, 2016 AT 8:07 AM

27 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Yes you would have to relearn the crankshaft position sensor.Your actron cannot do that. It takes a advanced scan tool to it.

This guide will help

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting

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Saturday, May 14th, 2016 AT 12:36 PM
Tiny
1042549
  • MEMBER
  • 15 POSTS
Thanks. I got the ECM installed, but I still have the same problems. I spent $2000.00. I have gone through three techs, still no fix. Kind of at the end of my rope. Thanks for listening.
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Sunday, May 15th, 2016 AT 2:12 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
So what is the problem your having? Please share.
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Sunday, May 15th, 2016 AT 2:15 PM
Tiny
1042549
  • MEMBER
  • 15 POSTS
Stalling and hard to start. I have had fuel pump, relays fuses, plugs, throttle body and ECM replaced. Also has p0410 code. Maybe oxygen sensor?
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Sunday, May 15th, 2016 AT 2:20 PM
Tiny
1042549
  • MEMBER
  • 15 POSTS
I also had the rim replaced. It is stalling and hard to start. On the interstate 60 mph it may just die, like I it is not getting fuel. Then will not start. I pulled a fuse or relay, plugged it back in. Bang, it starts and I can drive it for a while.
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Sunday, May 15th, 2016 AT 2:41 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
So when it stalls and dies what are we loosing spark or fuel pressure? Also have you thought about a bad fuse box or loose connection to the fuse box?
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Sunday, May 15th, 2016 AT 2:44 PM
Tiny
1042549
  • MEMBER
  • 15 POSTS
I think its fuel pressure. Whenever I pull fuel pump relay or fuse and plug it back in, it usually starts.
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Sunday, May 15th, 2016 AT 2:50 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
That does not really make sense unless your pushing on the fuse box causing it to start.
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Sunday, May 15th, 2016 AT 2:53 PM
Tiny
1042549
  • MEMBER
  • 15 POSTS
It does not make sense, yet it has been a seeming quick fix when I am stuck along the road. Sometimes I unplug the battery and it seems to do better. Maybe that one has nothing to do with the other, but when I am stuck out on the road with my wife I have to do something. These things seem to help. I like your thinking on the fuse box. It is something to look at.
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Sunday, May 15th, 2016 AT 3:04 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
I have seen open terminals going to the fuse box plus bad fuse boxes causing issues like that.
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Sunday, May 15th, 2016 AT 3:08 PM
Tiny
1042549
  • MEMBER
  • 15 POSTS
Thank you! I will look into these things and get back to you. Talking with you has calmed me some. Thank you again. Larry
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Sunday, May 15th, 2016 AT 3:15 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
You are welcome try just pushing on the fuse box while someone tries starting it. Also I would unplug all the connectors to the fuse box and look at the connectors looking for open terminals. If you compare them to the other connectors they really stand out.
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Monday, May 16th, 2016 AT 9:39 AM
Tiny
1042549
  • MEMBER
  • 15 POSTS
Thanks, I will try that. I am at work, so I will do it later this afternoon. Assuming it starts and I get home. Haha!
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Monday, May 16th, 2016 AT 9:48 AM
Tiny
RENEE L
  • ADMIN
  • 1,257 POSTS
Great job SATURNTECH9! We really appreciate your expertise and staying with Larry helping him get to the bottom of his car issue. Hopefully he will get back to you with his findings.
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Monday, May 16th, 2016 AT 11:50 AM
Tiny
1042549
  • MEMBER
  • 15 POSTS
Yes, Saturn has been great. The car was running and I pressed around on the fuse board. It died when I pressed on the fuel pump relay. I don't know if that's a problem or if it died because it does sometimes. Can the fuse board be taken off easily? What do you think?
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Monday, May 16th, 2016 AT 1:20 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Let's try to make it die one more time just to be sure? But it sounds like we're down to the things bad relay bad fuse box or open terminals on the wires to the fuse box.
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Monday, May 16th, 2016 AT 2:53 PM
Tiny
1042549
  • MEMBER
  • 15 POSTS
Well, new stuff. It doesn't, as of now, have a hard time starting nor does it die. I was driving it lurched and runs like a loose plug wires. Slight smell of sulphur. But it seems to start and not die.
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Tuesday, May 17th, 2016 AT 10:47 AM
Tiny
1042549
  • MEMBER
  • 15 POSTS
Code p0304. Cylinder4 misfire
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Tuesday, May 17th, 2016 AT 11:01 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
So is the misfire intermittent?Happen all the time? Also is it worse with the AC on if your AC works?
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Tuesday, May 17th, 2016 AT 12:28 PM
Tiny
1042549
  • MEMBER
  • 15 POSTS
Misfire all the time. How can it be that it starts all the time now, also it doesn't stall? This problem and the other we were working on related?
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Tuesday, May 17th, 2016 AT 12:35 PM

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