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Jan 23rd, 2013
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96 mercury 200 efi fouling plugs with oil #12453311
10/04/17 09:56 PM
10/04/17 09:56 PM
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AUBREY, TEXAS
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CWSANDERS Offline OP
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I have a 200 efi that still has to oiler. It is fouling the plugs if i idle to much. Would it be best to remove oiler and just mix gas? I feel like it is getting to much oil. Thanks

Re: 96 mercury 200 efi fouling plugs with oil [Re: CWSANDERS] #12454557
10/05/17 09:25 PM
10/05/17 09:25 PM
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TLW Offline
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you might wanna get it checked out first.. it takes "A LOTTA OIL" ta foul a plug.. you may have something else goin' on.. ie: tpi, leaky injector, fuel pump diaphragm, etc.....

send me an email address and i'll send ya an oem manual in pdf...

Re: 96 mercury 200 efi fouling plugs with oil [Re: CWSANDERS] #12454607
10/05/17 09:54 PM
10/05/17 09:54 PM
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Seadrift TX
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Pat Goff Online content
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Unless you’re running junk champion plugs if you are replace with NGK’s.


Pat Goff
Seadrift TX
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Re: 96 mercury 200 efi fouling plugs with oil [Re: CWSANDERS] #12455118
10/06/17 08:19 AM
10/06/17 08:19 AM
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TLW Offline
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champs ina merc v6 would be tha ultimate sin!

Re: 96 mercury 200 efi fouling plugs with oil [Re: CWSANDERS] #12455628
10/06/17 05:35 PM
10/06/17 05:35 PM
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AUBREY, TEXAS
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I am running ngk. I clean them though and then check them after I run for a day. They are black and oily. When I changed/ replaced plugs last weekend when I laid the plug down and picked them back up they had dripped oil off the plug. It also boggs a lot of the times when I take off. thanks for the help

Re: 96 mercury 200 efi fouling plugs with oil [Re: CWSANDERS] #12455951
10/06/17 09:49 PM
10/06/17 09:49 PM
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Littlefield Tx & Lake A. H. US...
gary purdy Offline
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Check the oil metering arm where it connects to the oil pump. I have seen several connected wrong. Marks on the pump line up with mark on the linkage when right. Like TLW said check the manual fuel pump diaphragm too.


The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
Re: 96 mercury 200 efi fouling plugs with oil [Re: CWSANDERS] #12457232
10/08/17 01:37 AM
10/08/17 01:37 AM
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San Angelo
tmd11111 Online content
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Considering the motor is over 20 years old the first thing I would check is compression. If it’s ok I’d then check the injectors. If the nozzles are clogged they will not atomize the fuel properly and will contribute to foiled plugs. Very doubtful what your finding on your plugs is oil considering on the old EFI’s it’s mixed with the fuel before it’s injected in the intake. Wet plugs is generally is generally unburned fuel.

Re: 96 mercury 200 efi fouling plugs with oil [Re: CWSANDERS] #12457600
10/08/17 08:18 AM
10/08/17 08:18 AM
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TLW Offline
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what does it run like, idle, off idle, wot?.. are you lookin' at tha plugs after ya idle a bit or after a wot run?.. drippin' plugs usually are not firin' (electrical) like they should, stuck/nasty injectors, tpi, mechanical pump (diaphragm) etc......

jus doin' it at idle points ta tpi, mech. pump, timin'/switch boxes, nasty injectors...... get it checked since I get tha feelin' you don't wanna mess with it with not being a "simple/easy" fix.............

Last edited by TLW; 10/08/17 08:38 AM.
Re: 96 mercury 200 efi fouling plugs with oil [Re: CWSANDERS] #12458889
10/09/17 01:37 PM
10/09/17 01:37 PM
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AUBREY, TEXAS
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It seems to idle good just smokes. The compression is all right around 120. It runs out at wot about 5200 rpm with new prop and around 50 mph. I pulled the new plugs Saturday and they didn't have as much oil on them.

Re: 96 mercury 200 efi fouling plugs with oil [Re: CWSANDERS] #12459372
10/09/17 07:04 PM
10/09/17 07:04 PM
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TLW Offline
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when your at idle make sure its trimmed level or tad positive at least.... 5200 is to low for wot.. motor needs ta see 5800 every once ina while......

boat?... prop?... motor height?... offset?

Last edited by TLW; 10/09/17 07:10 PM.
Re: 96 mercury 200 efi fouling plugs with oil [Re: CWSANDERS] #12459451
10/09/17 07:49 PM
10/09/17 07:49 PM
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AUBREY, TEXAS
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Ok well when i got boat it had a 19 pitch 3 blade prop and was running well over 6000 rpm. I put a 25 pitch 4 blade on it which it what i am using now. It still kinda plows thru water when taking off though. The motor is on a 20ft fiberglass deep v.

Re: 96 mercury 200 efi fouling plugs with oil [Re: CWSANDERS] #12459461
10/09/17 07:55 PM
10/09/17 07:55 PM
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AUBREY, TEXAS
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Ok well when i got boat it had a 19 pitch 3 blade prop and was running well over 6000 rpm. I put a 25 pitch 4 blade on it which it what i am using now. It still kinda plows thru water when taking off though. The motor is on a 20ft fiberglass deep v.

Re: 96 mercury 200 efi fouling plugs with oil [Re: CWSANDERS] #12459786
10/09/17 11:55 PM
10/09/17 11:55 PM
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Lake Fork
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heybaylor Offline
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19 to 25 prop is a big jump 5200 is low , prop it to 5800 more or less.
then if you are running surface gap plugs , ditch em for air gap (stay with NGK)

Last edited by heybaylor; 10/09/17 11:55 PM.

heybaylor
Re: 96 mercury 200 efi fouling plugs with oil [Re: CWSANDERS] #12460209
10/10/17 08:22 AM
10/10/17 08:22 AM
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TLW Offline
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Originally Posted By: CWSANDERS
Ok well when i got boat it had a 19 pitch 3 blade prop and was running well over 6000 rpm. I put a 25 pitch 4 blade on it which it what i am using now. It still kinda plows thru water when taking off though. The motor is on a 20ft fiberglass deep v.


like said above... sounds like it needs ta be a tad smaller (get rpm up) bow liftin' type.. call josh at steve's custom props and talk ta him.... you will need ta know motor height and offset when ya call 'em

Re: 96 mercury 200 efi fouling plugs with oil [Re: CWSANDERS] #12460368
10/10/17 01:25 PM
10/10/17 01:25 PM
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AUBREY, TEXAS
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ok thanks

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