badwrench
3/5/2008 6:29:23 AM
1985 S10 Blazer
2.5 Standard trans.
4,000 miles on rebuilt engine
Engine starts up fine, at 1st at higher RPMs as normal
Shortly later it idles down
Takes off OK as you shift to 3rd and sometimes as late as 4th gear the engine just stubles
push gas to floor no help
let up and it will try to run
dwn shift and engine still no power.
NEW PARTS
TPS
O2 Sensor
MAP Sensor
Coolant Sensor
Fuel pump and sock
Fuel pump
Fuel Pump relay
Distributor cap and Rotor
Plugs and plug wires
Carb. changed out from a different 2.5 that was runing ok
Coil changed out from a " " " " " " "
Votage input and output checked and OK on:
TPS
Map
O2
Alternator voltage is 15
EGR working OK
Field Service Mode--shows to be in closed loop
No check engine light after start up
No codes stored in ECM
Timing 8 degrees at idle after warm up--shows advancement
Fuel pressure of 11 PSI with engine runing
Today I am going to check the wiring to the ECM and make sure the various signals are reaching it but I'm sure they are because if you disconnect the TPA, or MAP or O2 sensor you will get a check engine light and a code. Going to also check for possible vacuum leak.
