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1998 dodge ram 5.2 cylinder 8 misfire

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Old 03-01-2011, 05:42 PM
spiltmybrains spiltmybrains is offline
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Default 1998 dodge ram 5.2 cylinder 8 misfire

hey guys I have a 98 dodge ram 1500 4 wheel drive 5.2 litre I'm having a misfire issue I've changed coil,plugs,wires,cap and rotor. I keep getting a po308 code misfire cylinder 8 I keep hearing about a plenum gasket problem on the intake now do I check that first or move on to injectors and fuel rail I.E clean rail replace injectors. any help will be greatly appreciated thanks
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Old 03-01-2011, 05:58 PM
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Welcome to the site. Might wanna post technical Qs over in the 2nd Gen section for more/better help

http://dodgeforum.com/forum/2nd-gen-ram-64/
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Old 03-01-2011, 05:59 PM
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Welcome to the site. I will move this thread to the second generation Ram section,
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Old 03-01-2011, 06:23 PM
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Look down the thote body and look for pool of oil

check the cat it maybe collged up do to a leaky plumen gasket
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Old 03-01-2011, 07:56 PM
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X2 plenum gasket. What did the #8 plug look like prior to changing them out ? Before replacing an injector try moving it to another cylinder to see if the miss follows ti the new cylinder. You can also check the ohms and the injectors fuel basket for gunk why its removed. Good Luck.
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Old 03-02-2011, 04:41 PM
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the original plug looked like hell the electrode was melted and I replaced it with champion spark plug what the auto part store said dodge specified for that engine have'nt started the fuel rail work but will see if there is oil in the bottom of the plenum also

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Old 03-02-2011, 04:52 PM
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and thank for your time and knowledge much appreciated
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Old 03-02-2011, 04:55 PM
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If the plug was that bad, might not be necessary to go any further with the fuel rail/injectors. Have you started the engine since changing the plug? Run any better?
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Old 03-02-2011, 05:11 PM
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its better but still a little skip rerouted the wires properly and po308 still on I clear the code and run the truck it comes back on right away
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Old 03-02-2011, 05:15 PM
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Other than the miss, how does the truck run? Good Power? Etc.??

Wonder if your plenum hasn't been blown for a while, and the cat is getting clogged.....
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Old 03-02-2011, 05:17 PM
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runs great aside from the skip and upon further reading online I have been losing oil. not burning but only once in awhile upon start up I'm thinking your right about the plenum gasket
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Old 03-02-2011, 05:19 PM
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Have a look, take it from there.
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Old 03-02-2011, 05:23 PM
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runs good aside from the skip I'm thinking your right about the plenum gasket I've been losing oil and the trucks not burning oil constantly but upon start up I'll get a puff of smoke I chalked that up to valve seals but reading online that plenum gasket tends to saturate cylinder 8 and seven with oil
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Old 03-02-2011, 05:31 PM
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yep looked down the throat lots of oil guess I'll be doing that this weekend
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Old 03-02-2011, 06:06 PM
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Get the Hughes Plenum plate. Get your gaskets locally, intake bolts as well. (cheaper.)
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Old 03-08-2011, 07:50 AM
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well had my cousin fab an aluminum plenum plate from his machine shop for me to save some $$$ and I picked up a set of heads and intake complete with fuel rail and carb at a boneyard it came out of a wrecked truck so I knew the truck ran. gonna do the kegger mod and some work on the heads I'm thinking my old heads either have a crack or a burnt valve . I can get everything prepped and ready beforehand so my truck won't be down for too long will keep you posted

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Old 03-13-2011, 07:39 PM
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guys I'm bummed I started working on the heads in the process of re lapping my valves I discovered a very faint hairline crack between cylinder 8's seats I e intake exhaust now I heard some guys say don't worry about it, if its really prevalent your sh*t out of luck but a hairline cracks not a problem. what to do guys I'm on a budget and moneys tight
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Old 03-13-2011, 10:36 PM
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You can bolt 'em back on, and see what happens......(don't be surprised if you miss isn't fixed....) It IS a common problem on these heads......

Or, you can get replacement heads for about 270 each from Clearwater Cylinder head, or EQ, down in florida.
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Old 03-15-2011, 02:56 PM
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also heyyou what would cause the truck to turn over for a bit not start then finally start up have these trucks got a problem like that
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Old 03-15-2011, 03:06 PM
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Quote:
Originally Posted by spiltmybrains View Post
guys I'm bummed I started working on the heads in the process of re lapping my valves I discovered a very faint hairline crack between cylinder 8's seats I e intake exhaust now I heard some guys say don't worry about it, if its really prevalent your sh*t out of luck but a hairline cracks not a problem. what to do guys I'm on a budget and moneys tight
Even if money is tight, pay once and cry once. Get some new, beefy replacement heads while everything is apart. The money and time you "save" now many cost you much more down the road.
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Old 03-15-2011, 03:06 PM
 
 
 
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