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Engine Management, Fuel, Spark, EGTs, and Air/Fuel Ratios This forum includes general electrical, modification, tuning, repair, replacement, identification and restoration of all components mentioned above including SMEC, SBEC, Logic Modules, aftermarket engine management, etc. Nitrous oxide posts go in here. This is the place

Thread: Odd thing with my Omni fuel pump... Reply to Thread
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  Topic Review (Newest First)
09-10-2019 08:55 AM
NAJ
Re: Odd thing with my Omni fuel pump...

Quote:
Originally Posted by Canty13 View Post
When you guys say repair the HEP circuit, what does that mean? Just replace the HEP? Or check other wires too? I think that may be why I am getting no spark but I swapped the HEP and still no spark. So what else in the "circuit" do I need to check?
Please stop just replacing parts.
Follow the steps in the diagnostics I posted in post #15, that will lead you to the circuit that is creating the problem.
Once we know what circuit is causing the problem we can then diagnose the circuit to find the cause of your no start.
09-09-2019 03:16 PM
Canty13
Re: Odd thing with my Omni fuel pump...

When you guys say repair the HEP circuit, what does that mean? Just replace the HEP? Or check other wires too? I think that may be why I am getting no spark but I swapped the HEP and still no spark. So what else in the "circuit" do I need to check?
09-08-2019 09:49 PM
Canty13 I have looked at them, grabbed them and tugged on them. I guess I need to do a continuity check across them.
09-08-2019 09:38 PM
going4speed
Re: Odd thing with my Omni fuel pump...

Have you checked all the fusible links on the car?
09-08-2019 04:24 PM
Canty13 Okay what's my next step? I replaced the coil, I get voltage on positive coil terminal with ASD grounded but I am getting no spark from the coil when I turn it over. What would my next step be?
08-30-2019 01:03 PM
Canty13 Thanks NAJ and everybody who has helped. I'm out of town this weekend. I'll test it when I return and post the results.
08-29-2019 08:32 AM
NAJ
Re: Odd thing with my Omni fuel pump...

The ASD circuit provides power to the Fuel Pump, + Coil and Injectors.

Here are the No Start/No Spark diagnostics.
Post back where the diagnostics lead or if you have any questions/problems/concerns.

No Start/No Spark Diagnostics
https://www.turbododge.com/forums/f4...k-84-90-a.html
08-26-2019 07:31 PM
Canty13
Re: Odd thing with my Omni fuel pump...

Is there anywhere on the car that the fuel pump and spark circuit are together? If not maybe a location where they have wires in a close vicinity? I ask because at one point during my tests I got the fuel pump to work correctly on it's own. I wonder if I didnt wiggle the right wire somewhere. I also wonder if I didnt wiggle something lose. My wife and I will go through NAJ's steps for locating a no spark issue. But any input would be appreciated.
08-26-2019 07:18 PM
Canty13
Re: Odd thing with my Omni fuel pump...

Replaced the HEP and still no spark.
08-25-2019 01:07 AM
tryingbe
Re: Odd thing with my Omni fuel pump...

Try a different HEP sensor.
08-24-2019 08:37 PM
Canty13
Re: Odd thing with my Omni fuel pump...

I want to find the actual problem, however, would splicing into the grey ground wire and running it to its own body ground do the same thing as it running through connectors and splices to get to a ground? I would like to begin building the Shelby 2.2 T2 I have in the garage and at that time I could get better access to the wires behind the shock tower. Just curious if that could be a temporary fix.

On a side note, if I read the schematics correctly, the ground moves through multiple locations and ends at the "Panel ground (on left panel roll up panel)" Any idea where that is located?
08-24-2019 08:00 PM
Canty13
Re: Odd thing with my Omni fuel pump...

Sorry guys, I have been pretty busy this week in between rain showers so I haven't had much time to work on the Omni. However, I did tonight. I removed the interior so I could easily see the wires under the carpet. The ground wire from the fuel pump connector runs all the way up to a connector under the dash just behind the fuse block. I did a continuity check and that wire was good. So, I decided to go ahead and reinstall the pump into the tank since I knew the wires were good, and then the darn Gremlin started playing again. The fuel pump now runs when the ASD relay is grounded. Once the ground is removed the pump stops.

So since the pump was running I thought "why not, lets start it and let it run since it hasn't ran in a long time". It did run last fall, but not anymore. I have no spark now. Ugh!

Well, I am a little lost now, any ideas? I am about to look in my service manuals to try to follow the schematics but does anyone know where the ground goes to after the connector under the dash?

Any idea what to look for to get spark back?
08-21-2019 08:50 AM
NAJ
Re: Odd thing with my Omni fuel pump...

AFAIK only the fuel pump power feed runs from the front of the car to the rear of the car, the ground should only run from the connector to the body.

I would not worry about the other relays clicking when you manually actuated the ASD.

One thing at a time, get you pump circuit problem corrected, get the tank back in the car, add fuel and attempt to start the car and we will go from there or...
If the car starts and runs...
08-20-2019 07:24 PM
Canty13
Re: Odd thing with my Omni fuel pump...

Oh, one more thing. When I had the ASD grounded, the relay(s) on the driver side shock tower clicked. I expected things to click since they were being energized, but odd thing is they cycled. They would click every few seconds even if nothing was touched. The cooling fan would spin once then shut off too, a few seconds later it would spin again. I hope this car doesn't have a lot of wire gremlins...
08-20-2019 07:21 PM
Canty13
Re: Odd thing with my Omni fuel pump...

I may have found the issue. I did the continuity check on the GREY wire. I thought the Green was the ground so when I checked it yesterday I didn't pay much attention to it. However, when I checked it I found it as an open wire. So, to test this, I took a long wire, looped it around the grey wire terminal and connected the fuel pump connector. I then ran the wire to the negative side of the battery and then grounded the ASD relay and it kicked in. I then disconnected my ASD ground and just cycled the key and it worked. So, I think I have a bad ground wire. So can anyone give detailed instructions where that wire runs through the car? I will say that I moved the carpet on the passenger side and saw a rats nest of "stereo" wire. Something is bolted under the passenger seat and has all kinds of wires coming out of it for the aftermarket stereo that was in it. Thanks for the help so far everyone.
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