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Old 02-05-2005, 01:21 AM   #1
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jmedlin6 is on a distinguished road
Join Date: Jun 2004
Posts: 15
Default 2000 LS1 misfire/poor fuel economy

Ok so here it goes. I bought my 2000 LS1 used. All recalls have been done to the car. *Even the one where they replaced the engine*

Here is my issue. I am having an intermintant misfire. I am also getting poor gas mileage. There is no ck engine light! I have replaced the following items:
  • Fuel Filter
  • Air filter
  • Upstream O2 sensor
  • Ignition Coil 2nd time *it was replaced before w/ the recall*
  • New plugs
  • New plug boots
  • Down stream O2 was replaced a few months back *ck engine light w/ this one*

My mechanic hooked an OBDII up to it and we drove around. All of them would misfire sometimes. Usually when we were stationary #3 would misfire. It usually doesn't miss unless I am stopped at a light, the car is in drive and the A/C compressor is on. (I am thinking it us just making a greater load and causing the engine to miss easier)

When I had my PA emissions done a few months back my car passed but it stated:

"Based on the information gathered during an attempt to prefor an Onboard Diagnostic test, NO RPM signal was available from the Onboard Diagnostic computer system. This vechicle should produce an RPM signal from the Onboard Diagnostic computer system." Could this be my problem?

Also if I sit at the light and I give my car alittle gas and rev the engine up, it is smooth and won't mis. Anyone have any ideas?

This is driving me crazy!

Oh and Saturn checked it out and said everything was ok!


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