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#4760291 - 05/17/18 07:46 PM Miss Under Load in '97 Buick 3.8 6 Cylinder
Gebo Offline


Registered: 09/18/02
Posts: 2043
Loc: VA
I have been trying to figure out an intermittent miss under load in my Mom's car. 3.8 v6 Buick. Today I was checking it out and as I was pressing down the spark plugs on what I would call the
coil, one plug wire was loose. It was the one that goes to the #6 post. It's that junction box looking thing where the spark plugs start their way to the plugs. After I removed
the spark plug cap the metal post was rusted like nobody's business. I took some sandpaper and went to work and reattached the spark plug wire. I didn't get to drive it but was
wondering with this plethora of wisdom here on this forum if you think this rusty connection could cause a slight intermittent miss under load?
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#4760296 - 05/17/18 07:49 PM Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo]
JLTD Offline


Registered: 12/15/17
Posts: 517
Loc: US
Yes. Especially when it's damp out. Time to replace some parts....did you check the codes and was it misfire on #6?
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#4760309 - 05/17/18 07:57 PM Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo]
Gebo Offline


Registered: 09/18/02
Posts: 2043
Loc: VA
Didnít check the codes.
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'98 LEX LS400 280K
'00 LEX GS300 195K
'02 4Runner 225K
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#4760334 - 05/17/18 08:23 PM Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo]
mk378 Offline


Registered: 09/27/15
Posts: 1390
Loc: USA
The part that the non-plug end of the wire connects to is the coil. Pairs of spark wires attach to one of the three coils. The coils generate the high voltage for the sparks. Each coil fires two plugs at the same time. (This is called a waste-fire system because only one of the plugs actually has a fuel charge in its cylinder when it fires.)

If the end of the wire and the coil terminal are corroded or burnt, need to replace both. Definitely put on a wireset (all 6 wires) and replace any coils that are not clean.


Edited by mk378 (05/17/18 08:25 PM)

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#4760339 - 05/17/18 08:27 PM Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo]
229 Offline


Registered: 06/23/11
Posts: 729
Loc: Mid Atlantic
Yes, a new spark plug wire set is relatively inexpensive. Keep a check on the coolant level as these have an issue with the intake manifold failing and ingesting coolant.
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#4760340 - 05/17/18 08:27 PM Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo]
simple_gifts Offline


Registered: 07/26/04
Posts: 11910
Loc: Middlesex County CT
I had a 92 lesabre and had a similar problem; if you can find a dark area @ night, run the engine and rev it and check around the coil. I had visible shorting between the plug wires; I had the rectangular shaped coil with 3 plug wires on each side. Just a test b4 you start throwing $$ at it.
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#4760375 - 05/17/18 08:51 PM Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo]
dishdude Offline


Registered: 11/14/08
Posts: 8602
Loc: Phoenix
If the connections at the coil and wires are rusty, they need replaced. Do it right, replace the control module, all 3 coils, wires and plugs.
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#4760431 - 05/17/18 09:49 PM Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo]
Gebo Offline


Registered: 09/18/02
Posts: 2043
Loc: VA
It was just the #6 coil plug that was rusty. Still replace them all?
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'98 LEX LS400 280K
'00 LEX GS300 195K
'02 4Runner 225K
'05 Lex LS430 85K
'06 Toyota Highlander 145K
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#4760434 - 05/17/18 09:51 PM Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo]
dishdude Offline


Registered: 11/14/08
Posts: 8602
Loc: Phoenix
Originally Posted By: Gebo
It was just the #6 coil plug that was rusty. Still replace them all?


If this car is going to be around for a while I would. A lot of times a misfire will take out the control module, that's the part the coils sit on top of.
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#4760467 - 05/17/18 10:50 PM Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: dishdude]
bbhero Online   content


Registered: 03/20/15
Posts: 4499
Loc: Virginia
^^^^^^^^

What Dishdude stated is the right way to go.
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#4760589 - 05/18/18 06:23 AM Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo]
Trav Offline


Registered: 11/20/06
Posts: 18551
Loc: MA, Mittelfranken.de
I think I have an OE module and coils here for that car with about 25K on them. I can look around if you want them just pay the post.
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#4760631 - 05/18/18 07:23 AM Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo]
Gebo Offline


Registered: 09/18/02
Posts: 2043
Loc: VA
Trav,
Yes. Please! You still have my address? Just finished changing her oil in the rain. I drained it overnight and didnít anticipate this morningís rain. Gotta take it back to her today.

Iíve told you I love you too much. People might get the wrong idea.

Anyways, once again you are there for me smile
_________________________
'98 LEX LS400 280K
'00 LEX GS300 195K
'02 4Runner 225K
'05 Lex LS430 85K
'06 Toyota Highlander 145K
'09 Lex IS350 85K


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#4760634 - 05/18/18 07:24 AM Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Trav]
Trav Offline


Registered: 11/20/06
Posts: 18551
Loc: MA, Mittelfranken.de
I found the module and 2 coils, I will look for the third one later today, these are off a 2000 GTP block donor engine (same module and coils as yours).
I may have used the third coil or given it to someone I don't remember. Anyway these will get you started. PM me and I will send them out tomorrow if you want them.
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#4760638 - 05/18/18 07:26 AM Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo]
Trav Offline


Registered: 11/20/06
Posts: 18551
Loc: MA, Mittelfranken.de
No problem man, happy to give them a new home with someone who needs them.
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#4760639 - 05/18/18 07:28 AM Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo]
Gebo Offline


Registered: 09/18/02
Posts: 2043
Loc: VA
PM sent
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'98 LEX LS400 280K
'00 LEX GS300 195K
'02 4Runner 225K
'05 Lex LS430 85K
'06 Toyota Highlander 145K
'09 Lex IS350 85K


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