Having problems with your 1997 Chevrolet Lumina ?

I have a 1997 lumina with 3.1L. the problem started with loss of power under load and p0300 code. check coils and vacuum leaks both OK.change spark plugs and wires.[same problem] check compression OK.

\015 Problem with 1997 Chevrolet Lumina\012\012i have a 1997 lumina with 3.1L. the problem started with loss of power under load and p0300 code. check coils and vacuum leaks both OK.change spark plugs and wires.[same problem] check compression OK. change #1 02 sensor. engine starts,idles,drives and shifts smooth when cold,after temperature reaches 190 - 200 engine looses power under load [in park accelerates without any problems] .when in drive idles good and there is throttle responsein the first quater of the gas pedal travel, then there is no throttle response until the pedal is pushed all the way down, when the transmission downshifts and the engine revs to over 3000 rpm and the transmission upshifts,and i will maintain any speed it gets to until i have to change the speed , when the problem starts all over again. But if i disconnect the plug from #1 02 sensor and run it that way ,the problem disappears, the engine starts, idles and runs good, smooth shifting, smooth throttle up and down at any temperature and any speed, no misfire code and no loss of power.If i connect the plug of #1 02 sensor the problem comes back again.\015 Posted / edited by AnonymousUser on : 23-10-2017

Answers :

Since you changed the sensor we will assume it is working. When you disconnect it you put the computer in limp mode which stops it from using sensor values. If code 300 is the only code we will assume the coolant temp sensor and others are ok.
I would check fuel pressure with a gauge next.
Repair Help & Product Troubleshooting for 1997 Chevrolet Lumina

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