low RPM missfire - Maintenance and Repair Forum

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low RPM missfire
Friday, March 07, 2008 5:57 PM
last year my fuel pump went and i replaced it

it ran fine for a while then it started to skip around 2-3000 RPMs

my intake that i had on it broke so now it is running nothing from the TB and i dont have a filter on the hose that runs between the runners that use to connect to the airbox on the TB (thats off)

took it to autozone to check it out they said that an emission code (evap or something) or it could be no pressure in the fuel tank or lines

this is an 2002 ld9

Re: low RPM missfire
Friday, March 07, 2008 6:20 PM
just red this and it sounds about the same


ps i chaged my plugs

also my fuel filter
Re: low RPM missfire
Saturday, March 08, 2008 11:42 AM
just ordered this intake and these


hopefully it works



and that fuel pump i put in was used
Re: low RPM missfire
Saturday, March 08, 2008 1:02 PM
i hope you didnt order those plug boots from rockauto... they're a reputable company, but you can get those at any parts store. as for your code, have it scanned, and find out the exact code. no, an intake and plug boots will NOT fix an emissions code. most likely what happened was when you dropped/reinstalled the tank, one of the evap lines got cracked, pinched, or unseated.



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Re: low RPM missfire
Sunday, March 09, 2008 8:12 AM
also, what did you change your plugs to? if its anything other than ngk or delco, take them back.



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Re: low RPM missfire
Sunday, March 09, 2008 11:46 AM
i thought so i took it to ashop and they keep telling me that since the factory intake isnt on there that, that is the problem and i need to buy that one which is like 500 dollers i told them that they dont know what they are talkin about


it def could be an evap line we put it in in a hurry


the problem happened before the plugs but however they are bosch iradiums, i have ran them before with no problem. wouldnt the missfire be not randoms

so ill just get them at a parts store here then
Re: low RPM missfire
Sunday, March 09, 2008 11:49 AM
another thing i went pour seafoam in my vac line and it blew back into my face


that means something right
Re: low RPM missfire
Sunday, March 09, 2008 5:58 PM
then it wasnt a vaccuum line. bosch are about the @!#$tiest plugs you can run. get real plugs, like delcos. the intake is not the problem.



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Re: low RPM missfire
Monday, March 10, 2008 12:21 PM




its this one
Re: low RPM missfire
Monday, March 10, 2008 4:09 PM
what one? that engine's not even in a runnable condition...



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Re: low RPM missfire
Monday, March 10, 2008 9:16 PM
i know its just the best pic i could find of that tube

its the big black one in the middle not the one that connects to the tb the one that connects to the factory intake resonator

thats not even my car

Re: low RPM missfire
Monday, March 10, 2008 10:05 PM
thats not where you want to get at it from. pull off your brake power booster line and slowly pour it in there.



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Re: low RPM missfire
Wednesday, March 12, 2008 12:01 PM
i don't know which one is which
Re: low RPM missfire
Wednesday, March 12, 2008 2:49 PM
the brake booster. its a big (read 12" diameter) black round cake of metal on the firewall, it has your brake master cyl. attached, which has your brake fluid res. attached. if you cant find it after that description, close your hood and walk away. now, on it will be a large 5/8" or so hose. THATS the one you pour it into. disconnect it from the power booster side, and pour it in the hose. sowly. let about 1/2 the bottle go in SLOWLY. at which point you shut off the car. let it sit for 15 minutes, and this i the most important part, restrt the car in a wel ventillated area. there will be more smoke than you could possibly think.



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Re: low RPM missfire
Friday, March 14, 2008 1:08 PM
then whats the one thats connected to the black box on the block
Re: low RPM missfire
Saturday, March 15, 2008 6:54 AM
it looks to be an oil separator. im not all together familiar with the co, but thats not where seafoam goes.



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