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Old 04-09-2007, 02:33 PM   #1
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Cylinder 1, Cylinder 2 misfire

Hi guys I know that you guys probably talk about it alot but im trying to figure out what to do if I read the code for the "check engine" light for my 2001 celica gts and it said cylinder 1 misfire and cylinder 2 misfire. What are the possibilities of what it could be? Am I better off having Toyota fix it or will I be able to do it myself? Thanks for all your input!
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Old 04-09-2007, 03:05 PM   #2
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check this
http://www.newcelica.org/forums/show...ht=300+misfire
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Old 04-09-2007, 03:16 PM   #3
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my first thought were, get ur spark plug replace..
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Old 04-09-2007, 04:40 PM   #4
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Could be some bad gasoline. Reset & see if it does it again.
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Old 04-09-2007, 05:33 PM   #5
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spark plugs, coils, spark plug cables, fuel injectors...are the most likely culprits
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Old 04-09-2007, 08:39 PM   #6
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How does your car run? Does the misfire happen under load or at idle etc.. ?
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Old 04-10-2007, 01:03 AM   #7
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Cant be spark plugs

It cant be the spark plugs because 1) I already put it new ones and 2) the old ones, which are NGK, arent even bad, they arent burnt out or anything. It all started when I put in my cold air intake. when i turned on the car, i let it idle for a min or so and you can hear the intake kind of like suck in air and let it out, like real fast. i thought maybe there might have been air escaping from some other place on the intake so I made sure that all the sensors were sealed correctly and that no air was escaping. I reset it and now Im waiting to see if it comes up again. If it does im going to try switching the coils. Thanks guys!!
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Old 04-10-2007, 12:53 PM   #8
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Check your vacuum hoses to make sure everything is routed correctly, could be as simple as a improper CAI installation.
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Old 04-10-2007, 09:29 PM   #9
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Cai?

What exactly do you mean the CAI? does that have something to do with the oxygen sensor that goes on the intake? Sorry but im not to familiar with the terms.
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Old 04-10-2007, 09:31 PM   #10
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Got It....

ahh i just figured it out you meant cold air intake. For some reason that didnt sound familiar. Well I am sure that I routed the vacuum hoses right. but ill see if I can take pictures and if you can tell me if they are right that would be great. Thanks!
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Old 04-11-2007, 08:31 PM   #11
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CAI pictures....

Here are some CAI pictures that I took today. I even have video of the car running and making the huffing sound (the sound comes from the air intake filter), but i dont think you can upload video on here.




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Old 04-11-2007, 08:39 PM   #12
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I found something.....

I was checking my hoses when I took the previous picture and I found that one of the hoses (the one that is noted in the picture) wasnt on correctly. I secured it onto its place, but I kept getting the huffing sound. Is that normal? if anyone could help me, it would be greatly appreciated.

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Old 04-11-2007, 10:58 PM   #13
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That is just a vent for the ECU box.
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Old 04-12-2007, 04:04 PM   #14
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The huffing sound coming from the air filter is quite normal. From the pictures I can't see anything noticeably wrong. If this only started after you installed your intake, my guess is that the intake is throwing off the MAFS readings and causing the misfires, the BB mod to the intake may fix the problem.
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Old 04-12-2007, 10:32 PM   #15
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BB mod?

What do you mean by BB mod?
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Old 04-13-2007, 11:33 AM   #16
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It is a mod to your intake, if you do a search you'll find a lot of information about it.
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Old 04-13-2007, 12:37 PM   #17
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Remove the vacuum small hose coming off the plenum on your intake manifold (the one under the throttle body in that picture) and cap it and your problem will be solved.

That will be $20 please
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Old 04-13-2007, 12:44 PM   #18
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Quote:
Originally Posted by Boosted2.0
Remove the vacuum small hose coming off the plenum on your intake manifold (the one under the throttle body in that picture) and cap it and your problem will be solved.

That will be $20 please
That is right, I couldn't even see that in the pictures, I must be going blind.
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Old 04-13-2007, 12:47 PM   #19
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Quote:
Originally Posted by oscarscelica
I was checking my hoses when I took the previous picture and I found that one of the hoses (the one that is noted in the picture) wasnt on correctly. I secured it onto its place, but I kept getting the huffing sound. Is that normal? if anyone could help me, it would be greatly appreciated.

FYI - that plastic tube just carries air from the fan to the ECU box - it doesn't have anything to do with the engine or intake system
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Old 04-13-2007, 12:57 PM   #20
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This is the hose
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Old 04-15-2007, 07:31 PM   #21
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But.....

but it is capped.... if you look at the pic closer you can see that the hose is capped at the end??

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Old 04-17-2007, 10:50 AM   #22
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What kind of reading are you getting from the MAFS at idle? It should be between 1.1-1.5 volts, if its lower than that, the BB mod to your intake may fix the problem.
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Old 04-21-2007, 02:44 PM   #23
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Found problem.....?

I think I may have found the problem. I was reading some threads on here and I came across this one where they said that the 1st generation CAI (AEM) was causing CEL to go on because of the diameter of the piping (I then realized what you meant by the BB mod). Well guess what CAI I have? I have the 21-460R which is the first generation intake. I can almost bet that, that is the problem. I am going to get a new CAI 21-563. Not only to fix the problem (hopefully) but i've been wanting to get a new CAI anyways because the one I have is a used one that came with the car when I bought it a couple of months ago. Well if that doesnt fix the problem I will be back on here trying to find an answer. But in the mean time, thanks guys for all your input and advice.
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