Where's this wire go? 2.8/3.1/3.4 GM V6

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Where's this wire go? 2.8/3.1/3.4 GM V6

Postby paulevans76 » Tue Dec 20, 2016 9:49 pm

Trying to figure out where this puppy goes. Has 4 wires in it with a brass loop on the end. Had a plastic tab thingy that attached it to the inner fender.

In the photo, it's the one on the right in the group coming out of the firewall. (Passenger side, if that wasn't apparent)

20161220_204457.jpg
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91 SAS Trooper - Neverending tinkering
Semi-hopped-up 3.4 + MUA5 + 3.07:1 low
Waggy D44 Front - 5.38's + RCV's + OX
Rodeo D44 Rear - 5.38's + Detroit
35" General Grabber X3's on Interco Birddogs
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Re: Where's this wire go? 2.8/3.1/3.4 GM V6

Postby Ed Mc. » Wed Dec 21, 2016 2:12 pm

There is a group of ECM grounds that on the 2.8 bolts to a machined pad which is located on the pssgr's side of the block, towards the middle bottom. If these aren't connected, it'll run really strange.

On the 3.4, there is no pad, but instead a hole where the crankshaft sensor is installed for crank-fire ignitions. On my 3.4, I snipped the crankshaft sensor wires, left the sensor installed, and connected the ground harness to the single bolt that holds the sensor in place.

If that doesn't seem to be what you're holding, post a picture of the end. But that's the only set of wires that I recall terminating in one big lug like that.

Note if you can't reach that location on the block to connect the grounds, just find another suitable, solid spot on the block to ground them to. As I recall, you may be able to reach thru the rubber splash shields on the pssgr's side wheelwell to get at the crank sensor bolt.

HTH.................ed
'90 3.4 Troop LS;
'89 Troop RS (Exhaust Valve Challenged), now gone to a Good Home!
Yes, I am a Trooper-Holic!!!
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Re: Where's this wire go? 2.8/3.1/3.4 GM V6

Postby Ed Mc. » Wed Dec 21, 2016 2:18 pm

Hey, I thought there was a pic of that wiring running 'round the Planet, it was in a recent posting! Pic is attached, you'll see the knock sensor on the left and the group of wires on the right.

HTH........ed
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'90 3.4 Troop LS;
'89 Troop RS (Exhaust Valve Challenged), now gone to a Good Home!
Yes, I am a Trooper-Holic!!!
Keep On Troopin' !
Ed Mc.
Almost Joe Isuzu
 
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Re: Where's this wire go? 2.8/3.1/3.4 GM V6

Postby paulevans76 » Wed Dec 21, 2016 2:27 pm

That's it! You're the man, Ed! I have an expanding plug in that hole on the 3.4 block and used the small bolt hole beside it there where the ground was in your photo to secure a washer to keep the plug from backing out. I'll relocate the ground. Thanks so much - it gets me that much closer to getting the ol' hog back on the road :mrgreen:
91 SAS Trooper - Neverending tinkering
Semi-hopped-up 3.4 + MUA5 + 3.07:1 low
Waggy D44 Front - 5.38's + RCV's + OX
Rodeo D44 Rear - 5.38's + Detroit
35" General Grabber X3's on Interco Birddogs
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Re: Where's this wire go? 2.8/3.1/3.4 GM V6

Postby Ed Mc. » Wed Dec 21, 2016 2:55 pm

Glad that was it!

BTW, if you ever have a problem with that expanding plug, GM sells factory plugs for both the crank sensor & cam sensor holes:

9421749 PLUG CUP, CRANK SENSOR 3/4" OD

94033681 PLUG CUP, CAM SENSOR 20MM OD

I'd imagine these are just like a core plug/freeze plug and you could probably find a generic replacement at the auto parts store as well.

Cheers..............ed
'90 3.4 Troop LS;
'89 Troop RS (Exhaust Valve Challenged), now gone to a Good Home!
Yes, I am a Trooper-Holic!!!
Keep On Troopin' !
Ed Mc.
Almost Joe Isuzu
 
Posts: 2743
Joined: Thu Aug 14, 2003 1:26 am
Location: Poulsbo, WA
Has thanked: 5 times
Have thanks: 205 times


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