I have a 98 dodge ram 1500, 5.2 5 speed. When goin high in rpms at 3k exactly the truck missing and backfires really bad. But continues to keep goin up in speed and rpms, just misses bad. I cant figure it out. I have new map, tps,iac, cold air intake, headers, highflow cat and flowmaster, new o2 sensors, new plugs and wires, tb mod, 180 degree thermstat. All done about 4 months ago. Just started doing this last night. Any thoughts ?
missing at 3k really bad.
- Thread starter johnMZ24
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dodge dude94
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I say do a compression test and make sure the plenum isn't blown.
johnMZ24
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The plenum was blown when i first bought it last year just never got around doing it yet. But il have to def do a compression test.. it runs and has plenty of power exept in 3rd gear 3k rpm.. in first n 2nd i can go to 3500( i never go over 3500 ) and it dont miss at all.
dodge dude94
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It's possible your front O2 sensor is fouled out already from the burnt oil from the plenum.
My money is on plenum issues.
My money is on plenum issues.
dodge dude94
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Nope, unfortunately once it's fouled up, it's done. I would take it out to see how bad it is though.
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Im almost on E now, imma try n see if i put 89 in it if it will still do it. If it does, il do 93 this weekend. But i took the front 02 out n this is it. Its only couple months old. No codes at all besides target idle not set( from day 1 but check engine light isnt on, its from the plenum gasket. I idle at 900rpm and yes the cel does work).
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dodge dude94
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Might be lean running? Hard to tell.
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