1993 Chevy Blazer

Tiny
GOOBER1222
  • MEMBER
  • 1993 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 165,000 MILES
I have a 93 s10 blazer, 4.3 vortech v6, runs great when cold as soon as it starts to warm up it runs bad and I have fuel leaking into my oil, any ideas ?
Do you
have the same problem?
Yes
No
Tuesday, May 25th, 2010 AT 8:16 PM

2 Replies

Tiny
INTERNETMECHANIC
  • MEMBER
I'd use a gage and check fuel pressure. Also, check that the pressure doesn't drop like a rock when the key is turned off. Maybe the fuel pressure regulator is leaking? Any applicable trouble codes? Some of the national brand auto stores used to loan out a fuel pressure gage, if you don't have one.
Was this
answer
helpful?
Yes
No
Wednesday, May 26th, 2010 AT 8:46 AM
Tiny
CONSAKA
  • MEMBER
I suspect a temp sensor switch isnt working and thus the car is running too rich since the computer never comes out of open loop mode.
There are only two ways that fuel can get in the oil.
1. If you have a manual fuel pump and it fails then gas can get in the oil.
2. Your vehicle has raw gas running down the cylinder walls from either a malfunctioning injector or just plain running way to rich.

Now cold engines need more gas to run then warm engines. Also the o2 sensors need to be hot to operate. The result is that the computer will run in a rich open loop mode until it gets the message that the engine has warmed up enough to go to closed loop mode where the computer will then use the O2 sensor to determine whether the engine is getting enough fuel or not. That year also uses a MAP sensor to help determine the fuel requirements and those can also go bad.
I believe that either your temp sensor came unplugged or has failed. OR perhaps your thermostat stuck open and it never really does warm up enough for the computer to start working.
Was this
answer
helpful?
Yes
No
Wednesday, May 26th, 2010 AT 10:07 AM

Please login or register to post a reply.

Recommended Guides