1998 Chevy Blazer stalls and sputters

Tiny
TJOHN36
  • MEMBER
  • 1998 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Hi my 1998 blazer will momentarily stall when I'm driving, it won't die but will stall for a second or so, it has also shut off when I've let it warm up. Today while I let it warm up after work it would idle way down, it sounded like it was going to shut off than it would idle back up. I put a new fuel filter in it, checked the pressure which was good, I've added heet to the tank the last two times I've filled up and its still doing it, also no codes showed up when we plugged it into the computer at the repair shop. Also no problems starting it, I was letting it warm up before I went to work the other night, it died after idling for a couple of minutes, I restarted it and it fired right up. My mechanic and I are both really confused about it.
Tuesday, January 26th, 2010 AT 8:40 AM

9 Replies

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
OK first give me some history. You replaced the fuel filter and say the fuel pressure is good. What is the fuel pressure? What else have you replaced? What else have you checked? Let me know so I can try to help. Thanks.
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Tuesday, January 26th, 2010 AT 10:05 AM
Tiny
TJOHN36
  • MEMBER
  • 6 POSTS
Thanks for replying. I'm not sure what the fuel pressure was, my mechanic said it was good. I did put a new fuel pump in about 35,000 miles ago, 15,000 miles ago I did a tuneup (plugs, wires cap and rotor, fuel and air filter) and we just put a new fuel filter in last week, I thought that might be the problem this time, but that didn't help. He plugged it into the computer, no codes showed up. It runs and sounds great, it doesn't appear to be leaking anything, however there seems to be a little more water coming out of the tailpipe, although it has been a little colder outside(I'm from central MN).
Hopes this helps. Thanks
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Tuesday, January 26th, 2010 AT 1:11 PM
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok if you would stop at the local parts store and pick up a can of mass air flow cleaner. Then remove the mass air flow unit (pic below) and spray it out inside and reinstall it. Let me know if there is any change in how it runs. I also would like ot know when it stalls out does it seem to happen at the same temp all the time or is it just speratic.


https://www.2carpros.com/forum/automotive_pictures/249564_808321_1.jpg

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Wednesday, January 27th, 2010 AT 10:38 AM
Tiny
TJOHN36
  • MEMBER
  • 6 POSTS
Its sporatic, it will happen right after I start it in the morning or it will happen twenty miles down the road, I will get that mass air flow sensor cleaner tomorrow, lets hope that works. Thank You
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Wednesday, January 27th, 2010 AT 5:35 PM
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok sounds good let me know how it goes. It may or may not fix it but it is not expensive to try. Let me know how it goes and we will take it from there. We may have to check the coil and module ok.
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Thursday, January 28th, 2010 AT 10:09 AM
Tiny
TJOHN36
  • MEMBER
  • 6 POSTS
Got the mass air flow sensor cleaned, looks like new, it's still stalling. What do you think?
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Thursday, January 28th, 2010 AT 4:30 PM
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok if you would pay attention to the gas pedal position when it stalls out. If you lower or raise the pedal position does it stop stalling out? If so then I would like to check the TPS (throttle position sensor). You will need a digital multi meter to do this.
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Friday, January 29th, 2010 AT 10:19 AM
Tiny
TJOHN36
  • MEMBER
  • 6 POSTS
I will do that monday and get back to you.
Thank You
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Friday, January 29th, 2010 AT 5:50 PM
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok that will work thanks.
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Monday, February 1st, 2010 AT 11:36 AM

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