2001 blazer obdII code P0102

[soarjkelly]

the maf sensor is fine,though i saw some arching around the body of the coil i replaced the coil but still have the same problem,i have only 1 code P0300 random misfire,i did notice the alt is extremly hot to touch and the volts read 11-12 with everything on,i still dont know how to clear the comp

[BlazerLT]

Clear the comp by removing the negative battery cable and removing the ECM fuse from the fuse panel fo 5 minutes or so.

Clears everything for me.

Trace all the wiring go to and from the alt.

I still think the alt is shot for sure and will fail when it is warm. Bench testing it will not show this because they never test it with the temperature it is subjected to in the engine compartment.

[soarjkelly]

no more P0102 code- i c/o the alt and cleaned out the egr-but engine still wont tach past 2 and very little power-i get 2 codes both the same P0300 random or multiple misfires i'm pretty much besides myself on this

[BlazerLT]

Does your exhaust sound rather growly and loud?

Do you smell sulfer?

[soarjkelly]

no,i have pressure coming out at the tail pipe-though i did notice that the throttle body seems to be sucking in alot of air you can really hear it

[BlazerLT]

Check for a vacuum leak.

[soarjkelly]

any ideas as were to start? also should i consider c/o the cap and rotor? the car has only 48k

[BlazerLT]

Maybe check the cap and rotor for white corrosion.

Would be a good start. Also check your fuel pressure and see whether or not the fuel filter has ever been changed.

[soarjkelly]

rotor and cap weren't good so i changed them out i cleared the comp the misfire codes are gonr but that dam p0102 code is back-maybe a bad maf-which i c/o maybe they gave me a bad maf?-i don't have a way to check the fuel pressure so it looks like this car is going to have to see the man!

[BlazerLT]

Fuel pressure check will speak volumes.

Have you ever replaced the fuel filter?

[soarjkelly]

yeah i changed that out only 11$ but what a pain to c/o i'm going to have it towed to a shop that deals in gm's car and trucks,though i did talk to a guy yesterday that said his 2001 went through 3-fuel pumps

[BlazerLT]

Could be the pump or the fuel pressure regulator.

Lots of times the shops replace the pump when it is the regulator causing the problems.

Just keep it in mind.