LOPE AT IDLE

  • Tiny
  • ETERNAL
  • Chevrolet Blazer

I have a 1994 chevy s-10 blazer, 4.3L vortec v-6, 152726 miles. I just bought the truck 3 days ago and it ran fine. The next day it started to idle a little low and lope during idle. Also when you mashed the brake it would idle up for a second or two then lope again. To get it to crank you would either have to just hold it over or pat the gas a couple of times. When driving at normal speeds it would run fine. But when you stopped at a light or stop sign it would lope and try to go dead (sometimes it would die). Today I replaced the plugs, plug wires, distributor cap and rotor button. Nothing changed. My friend at the parts store said it could possibly be the catalytic converter, the idle/air control valve, or the throttle position sensor. He told me to pull the idle/air control valve and clean it with carb cleaner to remove the deposits from it and that might work. Did nothing at first but then kinda smoothed out a little but still idles a little low but not near as bad. Could it be the cat converter (hate those darn things) or one of the sensors my friend metioned. Also will my blazer run ok without the cat converter?

Do you
have the same problem?
Yes
No
Sunday, January 21st, 2007 AT 9:04 PM

3 Replies

  • Tiny
  • Bruce Hunt
  • Expert
  • 3,761 posts

Leave the cat alone and if it is the problem, I will never recommend replacing it.

Now, look at the coolant level of the vehicle. Make sure it is topped off, does not leak and that there is NO air in the system. Use a bleeder and purge the air out of the system.

Was this
answer
helpful?
Yes
No
Monday, January 22nd, 2007 AT 11:17 AM
  • Tiny
  • sponger
  • Member

Check for a vaccum leak. In particular, around the intake manifold. I heard the 4.3 engines are notorious for a leak there.

Was this
answer
helpful?
Yes
No
Sunday, January 28th, 2007 AT 4:49 PM
  • Tiny
  • skippyojen
  • Member

You might want to check the egr valve on it thats another thing the 4.3 has a problem with. Clean the carbon out of it.

Was this
answer
helpful?
Yes
No
Sunday, February 25th, 2007 AT 10:23 AM

Please login or register to post a reply.

Similar Questions