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Miss Under Load in '97 Buick 3.8 6 Cylinder #4760291
05/17/18 06:46 PM
05/17/18 06:46 PM
Joined: Sep 2002
Posts: 2,428
VA
Gebo Offline OP
Gebo  Offline OP
Joined: Sep 2002
Posts: 2,428
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?


'98 LEX LS400 280K
'02 4Runner 225K
'05 Lex LS430 85K
'06 Toyota Highlander 145K
'09 Lex IS350 85K
'07 Lex GX470 60K
Amsoil in all engines, transmissions and differentials

Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo] #4760296
05/17/18 06:49 PM
05/17/18 06:49 PM
Joined: Dec 2017
Posts: 1,445
US
JLTD Offline
JLTD  Offline
Joined: Dec 2017
Posts: 1,445
US
Yes. Especially when it's damp out. Time to replace some parts....did you check the codes and was it misfire on #6?


I'm a thickie; assimilate
But 20s have their place

Using AMSOIL‚ĄĘ

Hers: 2008 Jeep Liberty 138k, SS 5w30/Amsoil

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Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo] #4760309
05/17/18 06:57 PM
05/17/18 06:57 PM
Joined: Sep 2002
Posts: 2,428
VA
Gebo Offline OP
Gebo  Offline OP
Joined: Sep 2002
Posts: 2,428
VA
Didnít check the codes.


'98 LEX LS400 280K
'02 4Runner 225K
'05 Lex LS430 85K
'06 Toyota Highlander 145K
'09 Lex IS350 85K
'07 Lex GX470 60K
Amsoil in all engines, transmissions and differentials

Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo] #4760334
05/17/18 07:23 PM
05/17/18 07:23 PM
Joined: Sep 2015
Posts: 1,631
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,631
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.

Last edited by mk378; 05/17/18 07:25 PM.
Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo] #4760339
05/17/18 07:27 PM
05/17/18 07:27 PM
Joined: Jun 2011
Posts: 748
Mid Atlantic
229 Offline
229  Offline
Joined: Jun 2011
Posts: 748
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.

Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo] #4760340
05/17/18 07:27 PM
05/17/18 07:27 PM
Joined: Jul 2004
Posts: 12,098
Middlesex County CT
simple_gifts Offline
simple_gifts  Offline
Joined: Jul 2004
Posts: 12,098
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.


2004 Prius; 102K; ASL
2007 Yaris 78K 0w-40 Castrol
2006 B2300;132K;ALM


Was driving an ox cart; Now on the USS Enterprise
Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo] #4760375
05/17/18 07:51 PM
05/17/18 07:51 PM
Joined: Nov 2008
Posts: 9,394
Phoenix
dishdude Online content
dishdude  Online Content
Joined: Nov 2008
Posts: 9,394
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.


2018 Challenger SRT 392 PUP 0w-40 Wix 57899XP
2018 GTI
Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo] #4760431
05/17/18 08:49 PM
05/17/18 08:49 PM
Joined: Sep 2002
Posts: 2,428
VA
Gebo Offline OP
Gebo  Offline OP
Joined: Sep 2002
Posts: 2,428
VA
It was just the #6 coil plug that was rusty. Still replace them all?


'98 LEX LS400 280K
'02 4Runner 225K
'05 Lex LS430 85K
'06 Toyota Highlander 145K
'09 Lex IS350 85K
'07 Lex GX470 60K
Amsoil in all engines, transmissions and differentials

Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo] #4760434
05/17/18 08:51 PM
05/17/18 08:51 PM
Joined: Nov 2008
Posts: 9,394
Phoenix
dishdude Online content
dishdude  Online Content
Joined: Nov 2008
Posts: 9,394
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.


2018 Challenger SRT 392 PUP 0w-40 Wix 57899XP
2018 GTI
Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: dishdude] #4760467
05/17/18 09:50 PM
05/17/18 09:50 PM
Joined: Mar 2015
Posts: 5,594
Virginia
bbhero Offline
bbhero  Offline
Joined: Mar 2015
Posts: 5,594
Virginia
^^^^^^^^

What Dishdude stated is the right way to go.


Nissan Altima 3.5 Coupe
Mobil Super 5w30 Wix 57356
"Treat your family like your friends and treat your friends like your family."
Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo] #4760589
05/18/18 05:23 AM
05/18/18 05:23 AM
Joined: Nov 2006
Posts: 20,765
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,765
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.


ASE L1, Master. Deutsch Meisterbrief.
Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo] #4760631
05/18/18 06:23 AM
05/18/18 06:23 AM
Joined: Sep 2002
Posts: 2,428
VA
Gebo Offline OP
Gebo  Offline OP
Joined: Sep 2002
Posts: 2,428
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
'02 4Runner 225K
'05 Lex LS430 85K
'06 Toyota Highlander 145K
'09 Lex IS350 85K
'07 Lex GX470 60K
Amsoil in all engines, transmissions and differentials

Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Trav] #4760634
05/18/18 06:24 AM
05/18/18 06:24 AM
Joined: Nov 2006
Posts: 20,765
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,765
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.


ASE L1, Master. Deutsch Meisterbrief.
Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo] #4760638
05/18/18 06:26 AM
05/18/18 06:26 AM
Joined: Nov 2006
Posts: 20,765
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,765
MA, Mittelfranken.de
No problem man, happy to give them a new home with someone who needs them.


ASE L1, Master. Deutsch Meisterbrief.
Re: Miss Under Load in '97 Buick 3.8 6 Cylinder [Re: Gebo] #4760639
05/18/18 06:28 AM
05/18/18 06:28 AM
Joined: Sep 2002
Posts: 2,428
VA
Gebo Offline OP
Gebo  Offline OP
Joined: Sep 2002
Posts: 2,428
VA
PM sent


'98 LEX LS400 280K
'02 4Runner 225K
'05 Lex LS430 85K
'06 Toyota Highlander 145K
'09 Lex IS350 85K
'07 Lex GX470 60K
Amsoil in all engines, transmissions and differentials

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