. . =3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D snipped-for-privacy@comcast.net (Roger=A0Rabbid) . I have a problem with my 96 S10 (vin X 4.3)
This is what's been done.
The engine was rebuilt 25K mile ago. The fuel pump has approximately 40K on it.
I just replaced the.... ignition coil cap, rotor, wires, plugs, MAF sensor, MAP sensor, air filter, and the fuel filter.
The truck runs like crap at highway speed, and stumbles, and has completely lost it's get up and go. I've used dry gas and injector cleaner in it, and it still runs poorly. I hooked up an OTC scanner to it and watched the readings. The timing jumps from -20 degrees at idle to -40 when under throttle.
=A0=A0I'm one match away from burning this truck... HELP!!!
=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D When you had the OTC hooked up..... What was the STFT and LTFT readings? What did MAP frequency look like? Did the O2 readings look good? O2 cross counts? TPS readings? NO CODES?
answer the above.... or.....
Check compression.
Check vacume at idle and under cruise, pay attention to needle fluctuations AND readings. Check exhaust for excessive backpreasure.
Check alternator output.
Check for good ground connections.
Check the ignition module and pickup.
Check the Temp Sensor.
Check the O2 Sensor.
Check the TPS.
Check the IAT sensor.
Test, remove, inspect, and clean the IAC and the EGR, or replace, and go for another test drive.
Test fuel flow rate and preasure at high rpms.
Check the ECM.
repair or replace as needed, or post results for further help. Feel free to test in any order you see fit.
respectfully submitted for your consideration, ~:~ MarshMonster ~passes you a box of Diamonds~ =3D=3D=3D=3D=3D =3D=3D=3D=3D=3D