I am bumping this and trying it this weekend. Newbie here, just got an '85 GT and it hunts for idle from 400-1200 rpm up and down up and down when warm. I don't remember seeing any ground strap in that location on my car. Ill let everyone know what happens.
------------------ Louis Duet Baldwin, Long Island, NY "Blue" <= '85 GT "Gettin' There"
Can someone please tell me where the main negative cable off the negative on the battery goes to? Mine was connected to the bracket for the dogbone but the bracket is painted. Thanks
------------------ Louis Duet Baldwin, Long Island, NY "Blue" <= '85 GT "Gettin' There"
not sure of exact spot, but it goes towards the rear window just above the exhaust manifold closest to battery. i also added 2 based on this thread. i bought a 3 pack from ebay of flat braided, but regular neg batt cable should be fine too.
Can someone please tell me where the main negative cable off the negative on the battery goes to? Mine was connected to the bracket for the dogbone but the bracket is painted. Thanks
The ground cable attaches to a studded head bolt above #1 exhaust port.
i added another Ground Strap about a 6inch pc. of 4Ga. Wire that goes from the 15mm bolt that holds the EGR Solinoid Bracket on, to the bolt by the battery tray where the small ground wire is that comes off of the negative Bat. terminal with the 10mm bolt,
Where would we attach the new ground wire for those of us who no longer have EGR, as well as a 3800 conversion? Or would a new ground only be necessary on the old 2.8?
I've been having all kinds of trouble with idle, hesitation, stumbling and stuff, and finally realized that it's probably a grounding issue. Thanks for bumping this thread!
One project I'm working on right now is fixing a 10 gauge wire that runs from the transmission to the frame. It had broken off at the connector. Where the grounds are seems to vary. I have yet to see grounds on the throttle body or the bell housing. The hinge to block ground seems to be connected to the EGR solenoid bracket, the lifting hook, the dipstick bolt, a head bolt, and wherever else was convenient. Any parts store has the wide woven ground straps. They're probably better because they flex longer without breaking like my ten gauge wire.
[This message has been edited by 85 SE VIN 9 (edited 10-27-2014).]
Last year I was going to replace my negative battery cable anyway, I found a brand new one for a different GM vehicle that was significantly thicker, and zero corrosion.
First thing that happened when I tried to remove the bolt on the front of the engine was that it sheared. In addition, the nut on top of the bolt must have backed off a bit before it rusted in place, there was quite a bit of play on the connector at the end of the wire.
Got the bolt out, made a new bolt out of a stock bolt and welded a flange nut halfway up the length, so that it would sandwich the terminal inbetween once I backed another nut down.
I knew the ground wasn't at all good - but I was shocked at the sudden performance. I'm not talking about HP gains (though there may be some, IDK) but it was suddenly running significantly better.
Proper electrical connections are important in any application that requires them.
Just my two bits. When cleaning or replacing your cars grounds it is really important to use some electrical grease or neversieze to stop the grounds from corroding again and leaving you stranded. On a lot of the connectors and wiring that gets exposed to the weather GM applied a nasty tar like electrical grease that wouldn't wash away over time. Sleek
There are 12 locations for ground attachments. The ones that matter as far as the V-6 engine is concerned are:
G501 - near the dipstick coming from battery (large diameter) G502 - behind battery coming from battery (small diameter) G503 - underneath throttle body coming from harness G504 - undermeath throttle body coming from harness G505 - passenger side bracket for trunk hinge coming from G501 G202 - underneath console passenger side below ECM
Clean the grounds. There is no need to add additional ground wires if the grounds are clean.
------------------ formerly known as sanderson 1984 Quad 4 1886 SE 2.8L 1988 4.9L Cadillac 1988 3800 Supercharged
Bump Great topic, since I have my '86 SE interior in pieces right now I'll be servicing all the grounds and adding the cable from the EGR Bracket to the battery ground. My flex from the right deck hinge to the block has been flopping aimlessly for the 30 years I've owned the car.
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