Where/how do I get that checked?

Thanks Eric.
I was looking for a plug that had a whole bundle of wires running into it. I think I can find that.
Was that Russian file in these forum pages or a completely different web site?

1) Using your VOM to pull codes from the connector behind the glove box. If you have no pulses, but just a solid 12 V, the ECU is bad.

2) Assuming you don't see the above, then the next step is to remove the ECU (it's in that box underneath the dash on the passenger side). Disassemble the box so you can see the circuit board and look for the large power supply capacitors (little blue can-like things). If there's brownish goo underneath/around them, they are leaking and need to be replaced ASAP. There's a good how-to out on the web -- you should be able to search for this, or I think Ray might have a copy on his website? Ray?

Or, you could go here: http://www.tmo.com/howto/ecu1g/caps.htm


I'm thinking it's your MPI control relay tho', since you've tapped on it and the truck is running. If your ECU was fried, there would be no running truck <img src="/forums/images/graemlins/cyclops.gif" alt="" />

Eric W.

Take the analog voltmeter and probe the upper right and lower left terminals with the catch on the connector up.

My first bet is the ecu coolant temp sensor, the one on the front top of the motor with two terminals in a tee shape. If the ecu can't see the CTS signal, it goes to a fallback fuel map that may not be rich enough to get the motor to fire. I could nurse mine into firing only by bumping the starter a whole bunch of times and letting the slight injector leak flood a little fuel into the manifold, then crank it again. Eventually it would fire, taking longer in cold weather. Until it got too damn cold, and would not fire like yours. If the control relay is not working at all, the ecu won't get juice and you won't have a spark. Two soleoid switches in that relay. One feeds ecu, other feeds fuel pump.

Read those codes.

Okay, found the data terminal. Plugged up my volt meter and it started sending out codes. <img src="/forums/images/graemlins/lol.gif" alt="" /> When it sends out multiple codes, what is the pause between codes? What is the pause before it starts at the beginning for a repeat of the codes?

Disregard that last post. I believe I got it figured out. Codes are showing the oxygen sensor and the Engine coolant temp sensor. Way to go fasteddy! <img src="/forums/images/graemlins/kewl.gif" alt="" />
jeff

Fasteddy is the man! <img src="/forums/images/graemlins/cheers.gif" alt="" /> Glad to hear you're on your way to a permanent fix!

Eric W.