When starting the truck cold it will run at a slightly high idle approx 1300-1400 rpm then will go down to 1000 rpm after a few seconds. Without touching the throttle it will run smoothly for approximately 3-4 minutes then die. It will restart but not stay running unless I feather the throttle. It will not rev over 2500 rpm's no matter how I feather the throttle. I have completed a full tune up (plugs, cap, rotor, fuel filter, and wires) verified (twice) firing order 13726548. Fuel pressure test KOEO of 35psi and running 40psi, fuel pressure does not cut out when engine dies. Verified timing at 10 deg. TPS was tested (prior issue was that it would run for the 3-4 min then when the throttle was pressed the engine would die and not restart until engine was cold), TPS failed test and replaced. Still same results. IAC tested (failed by ohm test) replaced, same results. Checked for vacuum leaks by spraying ye old carb cleaner no change in RPM"s. Tried spraying carb cleaner down throttle body to see if RPM's would go higher, no change. Only DTC is 126, according to my source is that MAP sensor is higher or lower than expected. The only showing I have to test the MAP sensor is with a mulitmeter with hertz, the one item on my multimeter I do not have. I really detest "throwing parts" at a vehicle and want to make sure if there is another way to test the MAP. Or is there possibly something else a problem? Thank you so very much for what you guys do!
have the same problem?
Sunday, February 2nd, 2014 AT 7:41 PM