Runs Bad when Hot

[scuba dave]

My car has been hesitateing once the engine gets up over 200 degrees on the temp gauge. I have changed the crank sensors and unplugged the cam sensor and it still runs like the timming is bad. Do these 1995 auroras run in default until warm? I am wondering if my MAP sensor gets sporatic when it gets hot. I checked it out with vacuum pump and seems to be in range. The only things thzt showed up on the engine scan were, Map sensor low voltage, both crank sensors, and low voltage at the cam sensor. I am thinking of putting a new MAP sensor in it. See post below about Fuel filter and Camsensor for more explanation of my problem. Thanks for any advice or suggestions.

Dave A.

[aarcuda]

i had a similar problem that I just solved. it was the fuel pump. ran great when the outside temp was cool but bad when hot.

yours appears to happen when the motor is hot so maybe it is a sensor up in the engine. \


but check the fuel pressure. at least its a possibility. http://www.automotiveforums.com/vbul...hlight=aarcuda

[corning_d3]

Don't all those sensors share a 5 volt reference from the PCM? If the PCM voltage regulator was failing, it could make all them act up at once..

[lynzoid]

Originally Posted by scuba dave

My car has been hesitateing once the engine gets up over 200 degrees on the temp gauge. I have changed the crank sensors and unplugged the cam sensor and it still runs like the timming is bad. Do these 1995 auroras run in default until warm? I am wondering if my MAP sensor gets sporatic when it gets hot. I checked it out with vacuum pump and seems to be in range. The only things thzt showed up on the engine scan were, Map sensor low voltage, both crank sensors, and low voltage at the cam sensor. I am thinking of putting a new MAP sensor in it. See post below about Fuel filter and Camsensor for more explanation of my problem. Thanks for any advice or suggestions.

Dave A.

Was a coil for me ! Same symtoms after wires/plugs change !!! Like a misfire. Mind 95's can't detect misfire and indicate by MIL light.
Check grounding of ICM and PCM.
In my case engine heating up lead to bad contact and coil burned, resulting in intermittend weak spark in cyl 2+5.
It all started in a very big rain, so i deducted it's electrical.