Hello, I have a 90 Pontiac 6000LE with 3.1MPFI engine 3spd transmission. My Problem is Im running EXTREMELY rich, as in 1/4 tank of gas for a 10 mile drive! I replaced down the list (O2 sensor, MAP Sensor, IAC Valve, Coil Packs, Ignition Module, Fuel pump, Coolant Temp sensor, Crank Sensor, New Vac lines, Intake manifold gasket changed, EGR Valve, New Plugs/Wires) I had my Fuel Pressure Regulator checked and its fine at 38PSI, Aside from the TPS every sensor has been changed on this engine to my knowledge. The problem I have is when you let it idle after 5 min or so the engine will shake very badly, I will get pops out the exhaust and white'ish smoke.. I know thats head gasket sounding but its not in this case. Also within the past 5 months the Timing Gears and chain were replaced so its not a timing issue. I am stumped as to what it could be tho. ECM is working fine as when you d/c MAP sensor it throws codes that way, Not leaking Gas but bad gas smell, catalytic converter changed to.
1990 Pontiac 6000LE 3.1MPFI Problem TPS?
with a voltmeter check the wires on the tps i had a short in the plug and it was throwing 5 volts to the reference wire back to the computer. showing full fuel all the time. this was alright at start up because engine was cold but when it warmed up it had the same exact symptoms. should have three wires hot reference and ground. check these with key on engine off reference wire should have .5 volts open throttle to wide open and it should come up to 4.8 to 5.0 volts. also make sure you actually have vaccum to the map sensor. changing the sensor is useless if you don't have vaccum to it. hope this helps.
Reply:5.5 volts is too high. this is a problem. 5 volts on all the sensors is the maximum for the computer. 5.5 volts will allow it to throw more fuel into the system. sorry i didn' get back to you sooner.
trevor s
fourinthefloorfifthunderseat@y... Report It
Reply:thermostat could have a hole in it or its not closing any more.
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