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10-02-2016
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#1 |
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Join Date: Aug 2016
Location: Spring Hill, FL
Posts: 127
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Fouled plugs ?
Ok I have #4 and #8 fouling repeatedly . I had the cat come apart on that side and cleaned it out , and I havent replaced the O2 sensor yet , any suggestions ? And its setting a code 64 ,lean exhaust . Thanks !
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10-02-2016
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#2 |
 
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,395
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Re: Fouled plugs ?
Are the fouled plugs "oily" or "dry-soot"?
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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10-02-2016
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#3 | |
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Join Date: Aug 2016
Location: Spring Hill, FL
Posts: 127
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Re: Fouled plugs ?
Quote:
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10-04-2016
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#4 |
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Join Date: Aug 2016
Location: Spring Hill, FL
Posts: 127
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What causes sooty plugs ?
I'm looking for an answer to a repeated problem , only 2 out of 8 plugs are sooty . Is it injector issues , plug wires , coils , plug gap ? Can backfiring be an issue ? All of the above ?
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10-04-2016
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#5 |
 Join Date: Jun 2015
Location: Texas
Posts: 529
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Re: What causes sooty plugs ?
Probably best to move this to the technical section to get more answers. In any case. There are many potential causes, if its only two plugs try moving things around, like move a spark plug and the wire from a known good cylinder to your suspect one. If the problem follows the plug and wire, theres your problem. You can do the same for the injectors but it takes a bit more work.
If your car is a 90, it may be leaking valve guides. Has there been an increase in oil consumption? Any misses. Any recent Mods? Plug chart below for your reference https://www.google.com/url?sa=i&rct=...75710071916249 |
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10-04-2016
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#6 | |
   
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,147
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Re: What causes sooty plugs ?
Quote:
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director  91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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10-04-2016
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#7 |
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Join Date: Aug 2016
Location: Spring Hill, FL
Posts: 127
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Re: Fouled plugs ?
Its a 91 ,no new mods ,actually I think its stock , new ecm though . I replaced the plugs , same thing , i used a spark detector on every plug , no issue , now i did gap the plugs at 35 , maybe go to 50 ? I did a fuel leak down test for about an hour , no drop in fuel pressure.
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10-04-2016
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#8 |
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Join Date: Aug 2006
Location: McLean, VA
Posts: 3,726
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Re: Fouled plugs ?
How many miles? Do you know whether you have original injectors or they had been replaced? If replaced, which brand?
Last edited by secondchance; 10-04-2016 at 10:49 PM. |
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10-04-2016
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#9 |
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Join Date: Jun 2015
Location: Texas
Posts: 529
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Re: Fouled plugs ?
Coils on 4 and 8 weak?
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10-05-2016
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#10 |
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Join Date: Aug 2016
Location: Spring Hill, FL
Posts: 127
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Re: Fouled plugs ?
I have no idea what was done to the car , I am the third owner for 0016 . I would like to find the first owner and ask ! There is a sticker on the rear glass for ZR1 registry , so maybe they still visit the site !
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Linear Mode
