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Injector Output Circuit Not Responding - Gas Odor in Engine Bay - 93 Dakota


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Sappie19
New User

Nov 29, 2018, 10:04 PM

Post #1 of 10 (2249 views)
Injector Output Circuit Not Responding - Gas Odor in Engine Bay - 93 Dakota Sign In

Hi Everyone, verbatim code (from Haynes) "Injector output circuit not responding" Code 27

1993
Dodge
Dakota
5.2 V8 magnum 318 (from 96 RAM supposedly) in a V6 model of truck (old owner wanted V8 with stick which was not a stock option.)
214k

Aftermarket mopar ECM for an automatic truck - this is a manual, wiring harness was replaced.

I'm trying to self-teach repairs and would like some advice on my next step to tackle this issue.

I've replaced the injectors, cleaned all the contacts (corrosion everywhere) and it was running good for about a week or two with the above code. However now it idles poorly and accelerates poorly with strong gas odor in engine bay and appears to me gasoline leaking out of a crack in the exhaust downpipe (could be wrong). No similar odor or leak when truck was running well.

I am thinking my next step is to test the injector circuit to see if one of them has a ground and just stays open? I think this is how they work but correct me if i'm wrong. I believe the last owner sold it because of this same problem so seems unlikely two sets of injectors are bad. Also since it ran well for a week feels like it could be electrical.

Is this the route I should take?

I am getting three other codes but they are automatic transmission codes (as there isn't one) and EGR system code (also absent)


(This post was edited by Sappie19 on Nov 29, 2018, 10:07 PM)


Hammer Time
Ultimate Carjunky / Moderator
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Nov 30, 2018, 6:28 AM

Post #2 of 10 (2221 views)
Re: Injector Output Circuit Not Responding - Gas Odor in Engine Bay - 93 Dakota Sign In





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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
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Nov 30, 2018, 6:47 AM

Post #3 of 10 (2212 views)
Re: Injector Output Circuit Not Responding - Gas Odor in Engine Bay - 93 Dakota Sign In

First thing I would recommend is to keep a fire extinguisher on board.

This thing appears to be a mismatch of stuff.

If you can smell and see fuel, you need to figure that out first before going after electrical issues. Maybe you have an injector that is stuck open and dumping fuel into the exhaust.





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Sappie19
New User

Nov 27, 2019, 12:10 PM

Post #4 of 10 (1763 views)
Re: Injector Output Circuit Not Responding - Gas Odor in Engine Bay - 93 Dakota Sign In

Hi guys sorry to resurrect this old dead post but I finally figured out this issue

Using a noid light I discovered injector 6 was staying lit when the issue happened (intermittent as all hell), this means the injector was wide open - explaining the gasoline odor. 40 PSI spraying straight into the cylinder day and night. RIP to my catalytic converter

I tested the voltage at the computer (checking for shorted wire) and it had battery voltage meaning the computer wasn't firing this injector correctly.

Now to source a PCM for a 25 year old truck

Truly hope this helps someone out there someday!


Hammer Time
Ultimate Carjunky / Moderator
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Nov 27, 2019, 12:49 PM

Post #5 of 10 (1757 views)
Re: Injector Output Circuit Not Responding - Gas Odor in Engine Bay - 93 Dakota Sign In

You'd better check the wiring for a short to ground before you go splurging for a computer you may not need.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
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Nov 27, 2019, 2:23 PM

Post #6 of 10 (1752 views)
Re: Injector Output Circuit Not Responding - Gas Odor in Engine Bay - 93 Dakota Sign In

Sappie: Just thoughts for now> Has this just been sitting for a year or more now? Gas spraying into cylinder must also be in the oil hope you took care of that a year ago.
Anything but Mopars IDK why but just don't always ground enough this frame to body counts on it all. Whacko corrosion on some historically then another not?


1993 old is fine all depends on how stored and cared for tricky if just sitting a year for new unsold cars never mind this hope you paid attention.
Good luck see about the grounds as HT mentioned that are ANYWHERE can oddly mess up a show alone never mind the alteration,


Tom
PS: OK and I do add grounds just know metal to metals around this year zinc not copper/lead/glavy looking braids you may find crumble in hands??



Hammer Time
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Nov 27, 2019, 2:29 PM

Post #7 of 10 (1748 views)
Re: Injector Output Circuit Not Responding - Gas Odor in Engine Bay - 93 Dakota Sign In

I did not tell him to check ground. The PCM controls the injector by pulsing ground to it so if that wire is shorted to ground anywhere, the result will be exactly what the poster has, a solid ground keeping the injector on all the time.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
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Nov 27, 2019, 2:44 PM

Post #8 of 10 (1742 views)
Re: Injector Output Circuit Not Responding - Gas Odor in Engine Bay - 93 Dakota Sign In

It's the "whacko" that showed up a couple times for me. If the better ground was lost a "starter" for example used whatever else it could route thru and melted it. Odd like speedometer cables, clutch if cable + on and on. Dang things just all work backwards. OP said corrosion seen a year ago just on injectors so where else may it ground out? Just asking to look around, Tom


Hammer Time
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Nov 27, 2019, 2:47 PM

Post #9 of 10 (1740 views)
Re: Injector Output Circuit Not Responding - Gas Odor in Engine Bay - 93 Dakota Sign In

You're just confusing the situation now. This isn't a lack of ground situation.

The problem is about one wire from the computer to the injector being compromised.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
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Nov 27, 2019, 2:55 PM

Post #10 of 10 (1734 views)
Re: Injector Output Circuit Not Responding - Gas Odor in Engine Bay - 93 Dakota Sign In

OK, Carry on, Tom






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