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Old 05-09-2009, 11:04 PM   #1
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running bad help please

i got a 1999 3.8 liter when i crank it up i have to give it gas if i dont it want start when i do get it started when i give it gas it rattles on the to end (it sounds like the top) i put a water pump/ o2 cesors/checked the pivot and rockers i put it on the computor it says bank 1 and 2 .... can this be from cats or what i also put on coil pack wires and plugs some one please help dont no what to do !!!!!!!!!!
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Old 05-09-2009, 11:59 PM   #2
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Re: running bad help please

What did the computer say about bank 1 and bank 2? Cat's will rattle if they are starting to break up inside, could be causing restriction. If u have a scanner u can check the datastream on the O2 sensors. Upstream(before cat) voltage should be changing up and down,the downstream (after cat) should be pretty steady. If the downstream is changing up and down it usually means the cats are not doing there job and can cause car to run rough(or not start when it gets real bad)
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Old 05-10-2009, 12:10 AM   #3
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Re: running bad help please

it just says bank 1 and 2 thats all im going to get a scanner and see if thats the problem it sounds like the rattel when i hit the gas is coming from the top do you think that is also from the cats ?????thanks for all te help
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Old 05-10-2009, 12:12 AM   #4
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Re: running bad help please

without hearing it, its hard to tell. Exhaust sounds tend to transfer all over. If possible u can jack up the car and hit the cats(with your hand) and if they are broken up inside you will be able to hear them rattling.
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Old 05-10-2009, 12:14 AM   #5
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Re: running bad help please

thx
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