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11-06-2014, 07:27 PM | #1 | |
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Rough Idle, Acceleration miss
1996 Chevy Corsica Basic 3.1 150,000 miles
Vin: 1G1LD55M3TY272843 PO300 Random Misfire Code Somewhat rough idle, engine hesitates, Misses, sputters, when Throttle opened fast Here is what I have done so far. Replaced Plug Wires Replaced Plugs Replaced Coolant Temp Sensor Checked for Vacuum Leaks Replaced PVC Valve Tube Assembly Did Vacuum Test (15-hg Steady) (Snap throttle open test) go's to 5, 0, returns to 15-hg, (Deceleration: Goes to 25 or so then returns to 15 -hg Replaced Fuel Filter Replaced Fuel Pressure Regulator Replaced Both Oxygen Sensors 2 Out of 3 Coils Replaced (did swap coils around, no change) Checked Fuel Pump Pressure 38 to 40lbs Things I have not done Have not Checked Injectors Have not done a close inspection to see if antifreeze is leaking around the intake manifold (Not readily apparent) Have not checked EGR Valve (no codes) Have not checked MAF Sensor (no codes) Have not checked MAP sensor (no codes) Thanks for any suggestions Last edited by Railroader; 11-06-2014 at 08:11 PM. |
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11-06-2014, 07:45 PM | #2 | |
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Re: Rough Idle, Acceleration miss
See how it feels with the maf disconnected.
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11-06-2014, 08:47 PM | #3 | |
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Re: Rough Idle, Acceleration miss
It looks like the Intake Manifold is leaking, pool of antifreeze in the valley under the thermostat, and this is a known problem with the 3.1 engine. guess it is gasket change time. Did not appear to be any antifreeze getting into the oil though. Thanks
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03-01-2015, 05:37 PM | #4 | |
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Re: Rough Idle, Acceleration miss
That problems fixed, replaced intake manifold gaskets. Got another problem now.
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