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1997 Chevy Blazer engine stalls

Tiny
WOWBW7
  • MEMBER
  • 1997 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 105,000 MILES
Engine starts and idles fine. When I apply power the engine stumbles and stalls at about 1/3 throttle. Installed new fuel pump (twice), fuel filter, pressure regulator (2000 miles ago). No codes show up. Removed cat converter, no change. Fuel pressure shows 53lb at idle and increases to 60lb when throttle is slowly increased until engine sputters and dies at about 1/3 throttle.
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Tuesday, September 9th, 2008 AT 8:20 AM

7 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi wowbw7
Possible TPS Throttle position Sensor located on throttle body. It sends info to PCM as to throttle angle. If it is defective the PCM when it hits 1/3 make think it is at idle and back off fuel and timming advance. There is no adjustment or repair for a TPS and you would need to have engine scaned to confirm if it is defective. What happens if you nail it? If stumble only occurs at1/3 throttle then TPS maybe the culprit. Let me know
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Tuesday, September 9th, 2008 AT 10:21 AM
Tiny
WOWBW7
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  • 4 POSTS
Wouldn't faulty TBS throw a code?
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Tuesday, September 9th, 2008 AT 12:59 PM
Tiny
WOWBW7
  • MEMBER
  • 4 POSTS
Wouldn't a faulty TPS throw a code?
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Tuesday, September 9th, 2008 AT 1:00 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Not as long as ECM is getting input signal, thst is why you need it on a scanner
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Tuesday, September 9th, 2008 AT 1:05 PM
Tiny
WOWBW7
  • MEMBER
  • 4 POSTS
TPS checks out using a digital volt meter, with 0.6 volts at idle to 4.8 at full throttle. Any suggestions as to where to look? Thanx
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Sunday, September 14th, 2008 AT 1:55 PM
Tiny
LUKEVAN
  • MEMBER
  • 10 POSTS
Could be your Mass Air Flow sensor. Try cleaning it with a Q-Tip because I had the same problem!
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Tuesday, September 23rd, 2008 AT 8:44 AM
Tiny
NOEY BLAZE
  • MEMBER
  • 1 POST
CHECK THE BUTTERFLY IN YOUR THROTTLE BODY, MAKE SURE YOU DONT HAVE CARBON BUILD UP, USE THROTTLE BODY CLEANER IF SO, CHECK THE VACCUM LINES ON THE CAR ALSO, SPRAY THE CLEANER ON THE LINES IF YOU HEAR A DIFFERENCE IN THE IDLE THEN YOU KNOW YOU HAVE A LEAK, BUT CHECK INSIDE THE THROTTLE BODY FIRST. GOOD LUCK!
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Tuesday, October 21st, 2008 AT 9:46 PM

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