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  #1  
Old 02-21-2011, 11:59 AM
MUDLIFE MUDLIFE is offline
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Default HELP Truck is misfiring

i have a 98 ram 1500 4x4 it was misfiring so i did a full tune up plugs, wires, rotor, cap, etc. But this still didnt fix the problem, what else could it be and whats it gonna cost me???
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Old 02-21-2011, 01:52 PM
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Coule be a lean miss, broken valve spring, bad O2 sensor, bad CKP sensor, PCM...Have you checked for any codes?
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Old 02-21-2011, 04:21 PM
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Quote:
Originally Posted by RamTech View Post
Coule be a lean miss, broken valve spring, bad O2 sensor, bad CKP sensor, PCM...Have you checked for any codes?
Thanks for the response, yea i just checked for codes it says fautly upstream o2 sensor and cylinder #7 misfire... Could this be due to a vac leak?
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Old 02-22-2011, 10:59 AM
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mine was misfiring too. i just had to replace a bent push rod and valve spring on mine. real easy to do. shit, i have valve stem seals, a push rod, and a spring for ya if you need them. for free
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Old 02-22-2011, 11:52 AM
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Yes, a bad O2 sensor can make one run like crap. You should also check for a plenum pan gasket leak.
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Old 03-02-2011, 02:19 PM
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Mine was doin the same but I dont think quite as bad as Yours is sounding and My problem was a broke plenum gasket. I think the gasket kit was $22 from o'reily's. Give it a check. take off the air cleaner and open the baffles look through them into the plenum and see if there is oil there. If so, You'll need a new plenum gasket.
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Old 03-03-2011, 09:31 PM
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My 01 is having a similar problem. There's a noticeable lack of power at higher speeds as well as some rumbling throughout the whole truck coming from the engine compartment.

What I THINK the problem is comes from the last time I changed the spark plugs. Cylinder 7 is the one that's misfiring, and when I changed the SPs last time, I inadvertently damaged the wire leading to the cylinder. I managed to fix it, but I want to think that it's having issues again.
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Old 03-09-2011, 02:33 AM
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Quote:
Originally Posted by NuclearRam View Post
My 01 is having a similar problem. There's a noticeable lack of power at higher speeds as well as some rumbling throughout the whole truck coming from the engine compartment.

What I THINK the problem is comes from the last time I changed the spark plugs. Cylinder 7 is the one that's misfiring, and when I changed the SPs last time, I inadvertently damaged the wire leading to the cylinder. I managed to fix it, but I want to think that it's having issues again.
Yeah You gotta becarful for the wires those thing are a little more fragile than they look. lol
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Old 03-15-2011, 11:11 AM
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check your plenum gasket. if its blown i highly recommend a hughes plenum repair kit. it comes with a 1/4 thick aluminum plate all new gaskets and shorter lenght plenum bolts. all you need is new intake bolts which you can get from the dealer, which will run you about 20 bucks, or you can get them from hughes added to the kit.
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Old 03-15-2011, 12:38 PM
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Someone will have to explain the big to-do about these Hughes kits to me. Stock pans work just fine with the updated gaskets and spending money on these kits seems like a waste to me.
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