Need some help here!!!
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Senior User
Joined: Mar 2004
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From: ontario
Need some help here!!!
Hello all!!!!! first off it's about time i returned to this site......it has been awhile...anyhow Here is a big stumper i have come across in my recent upgrades to make the perfect ranger......I recently placed a K&N cold air kit and now that it has been installed my check engine light comes on and stays on..after a suggestion by the (ahem) powers that be I disconnected the neg. battery terminal and reset the computer then took off for a 350 km drive to get the comp. used to the increased airflow...,... well it sort of worked the engine light remained off until the following day when the mortor went over 5000 rpm's so i went to the local carwash again disconnected the neg. and washed the vehicle replaced the neg. and the light remained off. NOW i am nervous to put the pedal to the metal so to speak.....any suggestions cause the neg battery term disconnect seems to only be a temporary fix!!!! 
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Joined: Sep 2005
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From: Easton PA
I'd say if the light comes on, get it checked for codes to see whats really going on. There has to be a reason for it going off. Once you have the codes, go from there. My guess is that it may be running a little lean at the top end, triggering the check engine light.
Gary
Gary
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From: ontario
ok umm so what you are saying (ahem excusse mon lack of engine knowledge) lol is that it could either be the air filter itself which came right out of the package (pre oiled) or a disconnected sensor? and i have absolutely no clue what a vacum lean is.......thx 
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Joined: Sep 2005
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From: Easton PA
Agreeing with Ken, pulling codes will not void a vehicle's warranty. Go to a local autoparts store and get them pulled.
The MAF sensor could be unplugged or it could be dirty. When you were taking the old filter out, you could have gotten enough dirt on the MAF to cause it to read incorrectly. I'm not sure what vacuum lean is either but I guess it has to do with a lean condition.
I would start with running it WOT until the check engine light comes on and then get those codes pulled and go from there.
Gary
The MAF sensor could be unplugged or it could be dirty. When you were taking the old filter out, you could have gotten enough dirt on the MAF to cause it to read incorrectly. I'm not sure what vacuum lean is either but I guess it has to do with a lean condition.
I would start with running it WOT until the check engine light comes on and then get those codes pulled and go from there.
Gary
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From: ontario
okay i am not sure what you mean by wot but i have been running the vehicle daily but have not allowed the engine to run past 35-4000rpm's cause i am pretty sure the light will come on again do you guys think that the sensor might have to be replaced and is there such a thing as a mass airflow sensor for the 04 model
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From: Easton PA
WOT=Wide Open Throttle.
On an 04, I wouldn't think the MAF sensor would need to be replaced, just cleaned but it may need replacing. I do not know if those trucks came with Mass Airflow sensors.
On edit: WOW am I tired. MAF and Mass Airflow sensors are the same thing. So yes, they have to come with them I believe.
On an 04, I wouldn't think the MAF sensor would need to be replaced, just cleaned but it may need replacing. I do not know if those trucks came with Mass Airflow sensors.
On edit: WOW am I tired. MAF and Mass Airflow sensors are the same thing. So yes, they have to come with them I believe.
Last edited by G Lube; Dec 19, 2005 at 11:20 PM.
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Senior User
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From: ontario
Great advice so far guy's i am definetly taking all advice very seriously because this was an expensive upgrade!!!! I took the vehicle out today for a cruise to get it ready for the long trip to the office (no xmas for me 
) and i was still nervous about flooring it but instead i am gradually increasing the rpm's daily i had it just shy of the 5000 rpm mark and so far no light on i will however keep in mind all and any further suggestions cause this is a puzzling one...
) and i was still nervous about flooring it but instead i am gradually increasing the rpm's daily i had it just shy of the 5000 rpm mark and so far no light on i will however keep in mind all and any further suggestions cause this is a puzzling one...
Post Fiend
Joined: Dec 2001
Posts: 10,562
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From: South Jersey
The oil from the K&N filter can get on the MAF senser and cause problems, there's a link on cleaning it in the tech info thread at the top of this forum.
A vacuum leak would be an air leak in one of the parts you disconnected/installed.
A vacuum leak would be an air leak in one of the parts you disconnected/installed.
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From: ontario
Ok guys now that i am back once gain from work to continue creating my perfect ride I have continued your recomendations with little luck. I had a garage check the codes. (the dealership where i purchased the vehicle said my warranty would be void if they did it). No problems according to the computer hand thing they used. Now my check engine light is back on again but the garage said that it is nothing to worry about!!!!! I am unsure about that one..... They also said that it is probably because the air is either A: too cold as it is increased.....B: the amount of air is increased so much the computer can't register the amount thus the light.... Now they recomended i get a computer chip upgrade is this logical!!! i plan on doing that in the future but i need to be sure that my check engine light can be fixed b4 more is done.....Guys some help please i am stumped.
Post Fiend
Joined: Dec 2001
Posts: 10,562
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From: South Jersey
If the CEL is on you will have a code, they're scanner may not be able to pick them all up.
You will not void your warranty by pulling the codes. Try a local parts store, many do it for free.
If they tell you not to worry about the CEL and then to get a chip, then it's time to worry about your mechanic, time to find a new one.
You will not void your warranty by pulling the codes. Try a local parts store, many do it for free.
If they tell you not to worry about the CEL and then to get a chip, then it's time to worry about your mechanic, time to find a new one.