Better yet, suck on it. LOL.

Well, here's another way to test that:

-Remove the coil wire AT THE COIL.

-Have someone crank her for one to two secs

-Watch the coil. It should ARC to case or ground.

<IF> there's no power seen at the COIL secondary / output, then, you've got an issue and, it's going to be one of the following:

- FAULTY COIL How do I test for this?
Take a meter (OHM or DMM) and measure across the primary / input side and note the reading. SPEC on that should fall between ~ 1 OHM - to 1.20 OHMS both types of COILS here.

Measure secondary: measuring from one pin on the primary side to the output terminal (secondary) you should see a reading of oh, 11.3K - 15.3K OHMs.

NEXT: NO POWER TO THE COIL

The supply to the coil is not there. Taking a DMM, backprobe the HOT SIDE of the connector at the INPUT / PRIMARY side of the COIL. What is backprobing? Take a paperclip, attach it to the RED probe and GENTLY insert it into the OR/GN wire through the backside of the connector. DO NOT REMOVE connector. It needs to be done while connected and, inserted from underneath.

Next; take the BLK lead (GROUND) and ground that to the chassis at the headlight ground screw. Use sandpaper to get a good reading. DO NOT INSERT the probe into the connector ground. WHY? DEAD SHORT may result due to the use of NON-insulated paperclips that may inadvertently SHORT.

Use chassis ground.

Now, lets's just say that you don't have power to the EFI system and, a failsafe event has triggered the auto shut down command at the PCM LEVEL.

What I want / need you to do is:

- have someone turn the key to <ON> BUT DO NOT START IT. KEY <ON> and place your head at the fuel pump and listen for it whining.

<IF> you do not hear any whining- that means that NO power is being sent to the fuel pump. I know that if you've got no spark and, the fuel pump is not being powered on, that there's a failsafe event that has occurred thus shutting power down to the entire EFI system.

<IF> YOU DO hear the pump kick on, well, such is not the case and, you start looking at the supply to the coil and the coil itself. 99% of the time, the coil goes out.

Try that and report back.

EDIT: Since it was working PRIOR to the plenum change, I have another possible failure mode: possibly disconnected wire / ground and or CKPS sensor wire or SHORTED CKPS or CPS harness under the intake in the rear of the intake. Look back there with a mirror and verify that no wires were pinched / trapped between the intake and block. I've read about that happening. Just something that just came to mind here.

CM

 

I had the same problem before and it actually ending up being because I needed a new pcm

 

was it runnning fine before u did the plenum?

 

Make yourself some jumper wires. One positve, to feed power to the coil, and a ground wire. Do the same trick with the sparkplug in the coil wire. Apply power to the coil, and then ground it, when you REMOVE the ground, the coil should fire.

Are you getting power TO the coil?

 

Ok I have power to the coil for about 2 seconds wen the key is turned on wen I try yo crank it there is no power to the coil at all..wuts goin on there

 

What is happening there is this:

In the event of a failsafe event (such as the fuel pump shorting), or, if the CKPS (Crankshaft Position Sensor) or CPS (Camshaft Sensor) goes out or is shorted at the harness, the PCM is programmed to AUTO SHUT down all power to the entire EFI system thus, no power to the fuel system, no power to the ignition system and no power to any of the sensors as well.

That's what I was referring to before. This is why it's important to gather information as to if you've got power to the coil and, for HOW LONG. Now we know it's NOT getting power after 2 - 3 seconds. If it's cutting out after 2-3 seconds, most likely, a failsafe event has occured thus the PCM shuts power off the ASD relay thus, shuts power off to the EFI system.

In order to determine what's going on and, at what level, this can take some time and some troubleshooting.

I would revisit that area for, when changing a plenum, it's very easy to accidentally pinch the CKPS sensor wire under the rear of the intake thus SHORTING the harness or, cutting it thus, creating an OPEN CKT.

Start there. The CKPS comes off the rear of the bell housing down under the firewall, on the PASS side of the engine. THe harness comes up from there, behind the dizzy, and routes to a connector just to inner side of the DRIVER side valve cover in the rear.

You also didn't report back on whether or not you hear the FUEL PUMP turn on. That will help us determine even more if a failsafe event has occurred.

Since, you're losing voltage to the COIL AFTER 2-3 seconds, one more thing to do here would be to actually KEY <START> and listen for the fuel pump. If it too DROPS out after 2-3 secs, we now know with almost 100% certainty that a failsafe event has occured thus shutting down the EFI system.

Do that and then report back.


CM

 

hey guys, turns out i didnt have something toward the rear of the engine plugged in (not sure wut) so i plugged it in and that did the trick. now i have power to the coil wen cranking, however i still lose power to the coil after 2-3 seconds with the key turned to the "on" position, is this normal? i did not have the engine running and did not attempt to start it, i have to put the plugs back in and i just didnt feel like tackeling that tonight anymore

 

Perfectly normal. Power to the coil will be restored if you then turn the key to the Start position. Go for it.

 

Where was this located that you forgot to reconnect? The Drivers Side by any chance? If so, it was most likely the CPS or CKPS sensor. That's why it wouldn't start for ya. That's the main sensor that the PCM uses as a reference for the entire EFI system.

THe PCM is programmed to AUTO SHUTDOWN via the ASD (automatic shutdown relay) when certain conditions are not met:

- the engine is not running

- there's no CKPS reference voltage at the PCM input

- there's no CPS reference voltage at the PCM input

and, there's a few more however, in normal cases, with the KEY <ON> event only, the criteria is met (no engine running) and, all power is CUT.

It's part of the normal operation of the failsafe mechanism programmed into the PCM.

CM

PS: let me know what it was that you forgot to connect (location and color of connector)

 

black connector on the driver side off to the side of the distributor