Not running right

Tiny
KHOLTIN
  • MEMBER
  • 1990 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 254,000 MILES
My 1990 265 4.3ls10 blazer is not runing good when I am driving I will have the pedle all the way to the floor and it will be going like 5 mph and then the rpms will go way up and still nothing then they will drop my dad sais it is the catalitic converter.
Thursday, March 17th, 2011 AT 2:40 PM

9 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If the rpms are high and not moving, sounds like a tranny issue? Tranny fluid ok? How long since a tune-up? Any applicable mil codes?

Drop the exhaust from engine for testing, except for being louder, any different?
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Thursday, March 17th, 2011 AT 4:56 PM
Tiny
KHOLTIN
  • MEMBER
  • 6 POSTS
I just got a new tranny and I foud out it does not have a catalitic converter and it is not reving the rpms just stay at 1500 when the pedle is at the floor and it wont stay running when in ldle when trying to drive it is slow the pedle is to the floor and sometimes will rev up and still be driving slow
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Thursday, March 17th, 2011 AT 10:49 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Use a gage and check fuel pressure. Any applicable mil codes, you can check those yourself. Use a jumper wire at the A & B terminals at the datalink connector. Turn key just till dash lites come on, no further, no crank. The mil starts flashing, you count the flashes to get the codes, if any. Your looking for two digit codes. Let us know what you find.
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Thursday, March 17th, 2011 AT 11:37 PM
Tiny
KHOLTIN
  • MEMBER
  • 6 POSTS
There were two code I think it repeted 1, 2 a couple times then went to 2, 4 a couple more times then went back to the 1, 2
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Friday, March 18th, 2011 AT 9:25 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Code 12 probably just means your in diagnostic mode, I don't usually worry about that code.

Code 24 is the vehicle speed sensor located on the transmission tail-housing.
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Saturday, March 19th, 2011 AT 4:12 PM
Tiny
KHOLTIN
  • MEMBER
  • 6 POSTS
So what do I do
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Saturday, March 19th, 2011 AT 7:55 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I don't know how old that code? I'd replace the sensor, but, if that is an old code or a problem with wiring circuit, replacing the sensor may not fix it? I can't tell much from here.
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Saturday, March 19th, 2011 AT 8:03 PM
Tiny
KHOLTIN
  • MEMBER
  • 6 POSTS
Ok thank you for trying
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Monday, March 21st, 2011 AT 1:10 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
No problem, hope you get it going your way.
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Monday, March 21st, 2011 AT 3:19 PM

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