06-21-2008, 02:47 PM
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#1
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99 4Runner with a 304 code
99 4Runner. If we step on the gas it stutters and shakes. The engine light is on and if we step the gas down sometimes the engine light will flash. The code was 304 (Cylinder misfire #4) Is there any easy test to see what it is before i start replacing plugs, wires and coil. It also said it could be a vacuum leak or Injector fault. Thanks for any help.
Tom
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06-21-2008, 03:28 PM
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#2
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Easiest thing to do first is pull #4 plug and look at it and the wire. If you have carbon tracking down the white body of the plug, replace the plugs and wires. More than likely you will find a bad plug or injector. Unfortunately #4 injector is the only injector you cant get any access to without pulling the plenum. If the plugs and wires check out ok, pull the plenum, remove #4 injector and switch it with #1 injector. If the miss follows to #1, you know you have a bad injector. Use a silicon based lube on the orings to avoid pinching and leakage
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 02 Tundra TRD Limited. 285/75/16 Goodyear Dura-Tracs, 16x8 ProComp 1079 alloys, Bilstein 5100's with extra 1/4 spacer on top, Camburg UCA's, 1.5" block in rear, Banks catback exhaust , DDM Tuning 5000K HID's, Factory LSD in rear
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06-22-2008, 09:47 AM
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#3
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Thanks, I checked the plug and it appeared to have a carbon stripe. I bought a set of Bosch +2 and installed the three on that side. I also switched the Coil pack with #2. The truck ran much better but still missed a little. I plan on going to Autozone and check the code again to see if the code change. Any thing else i should do at this time?
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06-22-2008, 10:09 AM
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#4
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yes. Dont use bosch crap. Use only toyota,denso or ngk items to fix your truck
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02 Tundra TRD Limited. 285/75/16 Goodyear Dura-Tracs, 16x8 ProComp 1079 alloys, Bilstein 5100's with extra 1/4 spacer on top, Camburg UCA's, 1.5" block in rear, Banks catback exhaust , DDM Tuning 5000K HID's, Factory LSD in rear
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06-22-2008, 11:41 AM
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#5
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most helpful diagnosis steps
I am following along but have no troubles at present.
This is really helpful toytech76 to see the steps of the diagnosis.
Twams I hope this takes care of the problem for you, post up what all you learn please so we can all benefit.
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06-22-2008, 12:02 PM
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#6
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Still it is still running bad. I reset the Check engine and drove around but the check engine only came on once and went off. i was accellerating and flashed but did not stay on. Is that enough to get a code? or does it need to be on all the time to read the code?
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06-22-2008, 12:29 PM
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#7
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The code will be stored in memory once it comes on, even if the lite goes out.
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02 Tundra TRD Limited. 285/75/16 Goodyear Dura-Tracs, 16x8 ProComp 1079 alloys, Bilstein 5100's with extra 1/4 spacer on top, Camburg UCA's, 1.5" block in rear, Banks catback exhaust , DDM Tuning 5000K HID's, Factory LSD in rear
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06-22-2008, 01:55 PM
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#8
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Ok. The Code is still 304. So i will change the injectors. Do they come out easy or do i need any special tools. Also can they be cleaned or should i replace it if it comes up bad.
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06-22-2008, 08:47 PM
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#9
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Thanks for all the help. If i was a little brighter the problem would have been solved sooner. I took it that the plug wire # was for the cylinder that was at the end of the wire. After i decided to install the other 3 plugs i figured out i saw the number on plug wire were strainge with #3 in the back.
The #4 had a definate carbon strip and so far it runs Great.
Thanks Toytech!!!
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06-22-2008, 09:40 PM
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#10
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So you were looking at the wrong plug at first, and then once you found the correct plug, you just replaced it and its all gravy?
Just asking for learning purposes.
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1998 Toyota 4Runner Limited
1A5 V6 3.4l 4x4 w/ RR DIFF LOCK
Exterior: TRD Tacoma wheels painted black, Spidertrax spacers, 20% Tint, Coleman Safari Rack, clear corner lenses, custom dents
Interior: Alpine CDA-9883, Polk MOMO 6.5", Infinity Reference 5.25", Memphis 16-STT150 2 channel amp, custom mud
Offroad: OME 3" lift (881/890), 1" diff. drop from Toytec, Tacoma whip antenna, extended rear diff breather, gray wire mod, 285/75/16 BFG KM2s
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06-22-2008, 11:55 PM
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#11
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I hope you used dual electorde denso or ngk plugs. If not you may have issues down the road
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02 Tundra TRD Limited. 285/75/16 Goodyear Dura-Tracs, 16x8 ProComp 1079 alloys, Bilstein 5100's with extra 1/4 spacer on top, Camburg UCA's, 1.5" block in rear, Banks catback exhaust , DDM Tuning 5000K HID's, Factory LSD in rear
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06-23-2008, 09:29 AM
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#12
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so just the one plug was actually bad?
just trying to summarize for the mechanically impaired-it ended up being just the one plug was bad?
Also I have heard various figures for the spark plugs-is 30K miles really about all they should last?
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06 4th gen V8 4WD of course...
08 Honda Ridgeline RT
15 Camry SE-just got it in Jan. 2026
my Yota Fanatic photos are on Facebook- here is link:
http://www.facebook.com/album.php?ai...5&l=5795132731
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06-23-2008, 10:31 PM
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#13
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Re: so just the one plug was actually bad?
Quote:
Originally posted by Ron Helmuth
just trying to summarize for the mechanically impaired-it ended up being just the one plug was bad?
Also I have heard various figures for the spark plugs-is 30K miles really about all they should last?
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Yes. The standard plugs are good for 30K, platnum plugs are 60K and iridium plugs range from about 100-120K depending on application.
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02 Tundra TRD Limited. 285/75/16 Goodyear Dura-Tracs, 16x8 ProComp 1079 alloys, Bilstein 5100's with extra 1/4 spacer on top, Camburg UCA's, 1.5" block in rear, Banks catback exhaust , DDM Tuning 5000K HID's, Factory LSD in rear
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06-24-2008, 09:35 AM
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#14
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thanks very much toytech76
probably time to check mine again.
I see you recommend the dual electrode NGK or Nippodensos.
Time for me to start learning more about plugs.
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06 4th gen V8 4WD of course...
08 Honda Ridgeline RT
15 Camry SE-just got it in Jan. 2026
my Yota Fanatic photos are on Facebook- here is link:
http://www.facebook.com/album.php?ai...5&l=5795132731
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06-24-2008, 10:05 PM
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#15
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Member
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Im not sure about the part # for ngk but for the denso's get the K16TR-11 plugs
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02 Tundra TRD Limited. 285/75/16 Goodyear Dura-Tracs, 16x8 ProComp 1079 alloys, Bilstein 5100's with extra 1/4 spacer on top, Camburg UCA's, 1.5" block in rear, Banks catback exhaust , DDM Tuning 5000K HID's, Factory LSD in rear
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