Recent Posts

1

Rear Drivelines, Drive Axles and Gearing / Re: TH350 Dead

« Last post by Shifty on Today at 11:34:23 am »

Sounds like you have a plan, keep us updated!

2

Electrical / Re: ECM 1 fuse blowing 1987 chevy

« Last post by bd on Today at 02:00:04 am »

See below.

3

Rear Drivelines, Drive Axles and Gearing / Re: TH350 Dead

« Last post by 1980K20 on Today at 12:00:30 am »

The torque converter was blown.  The rear drum was worn, should have been replaced in the first build.  Seals in transfer case leaking.  Oil pan appears to be leaking. Will replace rear main seal on engine just in case.  There’s a coolant leak, likely from intake manifold (which i have to do myself).

They’re fixing everything except intake.  Cha-ching.  At least it will work.

Maybe get it home next week?  Then for the break in.

4

Electrical / Re: ECM 1 fuse blowing 1987 chevy

« Last post by Yellowcat on September 02, 2025, 09:03:04 pm »

The multimeter buzzes and goes to 0 when the probes are touched.. the EGR and EAC tested both at 37ohms. The truck will not start and run because I can't get power to fuel relay like it's suppose to have or power to the pump when I tried to  jump it from the pigtail on the fuel relay. Why is there no power to the green and white wire on e fuel pump relay when you turn ignition on??

5

Electrical / Re: ECM 1 fuse blowing 1987 chevy

« Last post by bd on September 02, 2025, 06:45:33 pm »

What does the meter indicate if you touch the two ohmmeter probes together?

6

Electrical / Re: ECM 1 fuse blowing 1987 chevy

« Last post by bd on September 02, 2025, 06:43:20 pm »

You didn't say if the EGR and EAC solenoids measured greater than 10 ohms...?

7

Electrical / Re: ECM 1 fuse blowing 1987 chevy

« Last post by bd on September 02, 2025, 06:41:21 pm »

Don't be alarmed by the 'OL' measurement on your meter.  OL means overload, indicating the circuit is effectively open from the perspective of the ohmmeter.  The ESC module, unlike the EGR solenoid and EAC valve solenoid, contains an integrated circuit with very high internal impedance that conducts microamps of current.  The EGR and EAC solenoids are electromagnets with moderately low impedance flowing approximately 1 amp each.  That's 6 orders of magnitude difference.  The primary concern was to discover whether the ESC module is shorted.  It is not. 

Simply for the sake of interest, recheck the ESC pins reversing the probe polarities to see if there is any difference and let us know. 

Regarding the fuel pump, will the engine start and run?

8

Electrical / Re: ECM 1 fuse blowing 1987 chevy

« Last post by Yellowcat on September 02, 2025, 06:38:25 pm »

Also as I have stated before the wires going to the fuel relay do not have power when turning the ignition key on the only wire that has constant power when the key is off is the orange wire

9

Electrical / Re: ECM 1 fuse blowing 1987 chevy

« Last post by Yellowcat on September 02, 2025, 06:13:23 pm »

I touched the probes on all different pins of the ESC  just to see if anything would happen...... it every time it just stays on the letters OL. I done all these three separate tests with the ignition key switch off

10

Electrical / Re: ECM 1 fuse blowing 1987 chevy

« Last post by Yellowcat on September 02, 2025, 06:09:55 pm »

More