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Old 07-31-2007, 08:44 PM   #1
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Ok fellas got a DOOZIE....

Ok yall know my ride. And for those whose dont.. fully built boosted focus.. I have my o2s tuned out because they were loosing signal. . Now for the problem. lately and its been getting worse. I have been having a problem with my car.. It idles horribly like its missing. you put your hand on the tail pipe and it sucks it up against it quickly...(ok dead sign of a miss right?) ok so wut i did was change the plugs regap them to wut tom told me to try. (35 was at 29) and still stubling.. so i checked each and every wire for spark..(got spark in all) but # 1 cylinder doesnt change very much when you pull the wire.. but the wire does spark.. so i took out the plug and looked for fouling.. (nope its good) ok so hmmm .... and also one of the problems it is having is wanting to start.. it started just giving problems just when it was cold now its all the time. almost like it is flooding.. i have to keep cranking it and it will start.. once its running and over 1100rpms it runs great.. I have cleaned the maf sensor and no change..also i think it is a bit weird my a/f gauge at idle is high 17s now were as when it was yesterday it was like high 15s Oh and i also checked fuel pressure and its good.. 45-48 at idle... wut are your ideas? I am thinking maybe a leaking injector.. but i dont know how to check for this.. help me out please any ideas would be appreciated...


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Old 07-31-2007, 08:48 PM   #2
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Throttle Position Sensor?
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Old 07-31-2007, 08:48 PM   #3
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If you wanted to check for a leaky injector, would it work the same way as unplugging a spark plug? Could you just unplug the injector? Or would that signal a code in the PCM/ruin something? Just an idea, because the same way that you would notice a change in idle with unplugging a spark plug you would notice a change in idle because of one cylinder not having any power due to the lack of fuel. Good Luck!
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Old 07-31-2007, 08:53 PM   #4
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theres no good way to check for a leaky injector. doing it that way is not smart. your likey to catch something on fire
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Old 07-31-2007, 08:53 PM   #5
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Quote:
Originally Posted by WeeAsp View Post
Throttle Position Sensor?
Y u say that? it runs great after 1100rpms no problems just below that

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If you wanted to check for a leaky injector, would it work the same way as unplugging a spark plug? Could you just unplug the injector? Or would that signal a code in the PCM/ruin something? Just an idea, because the same way that you would notice a change in idle with unplugging a spark plug you would notice a change in idle because of one cylinder not having any power due to the lack of fuel. Good Luck!
Im not really sure about this if its leaking i dont see this being able to tell you anything.. just my $.02 I could be way off though..
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Old 07-31-2007, 08:54 PM   #6
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theres no good way to check for a leaky injector. doing it that way is not smart. your likey to catch something on fire
Wut does a car do when an injector is leaking? starts bad and idles rough right?
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Old 07-31-2007, 09:12 PM   #7
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I wasn't talking about unplugging it from the fuel rail, I was talking about unplugging the electrical connection. And my thought was that if the injector was leaking, and it was unplugged that it should still flow less fuel because there isn't any electricity openeing it up for typical duty cycle/pulsewidth. And similarly to the spark plug check that you ran, the idle wouldn't change much with and without that injector plugged in.

Is there a chance that your coil pack is weak/damaged. It may be providing power to the spark plug, but if its a weak signal, or not enough power, then it won't give a complete burn in the cylinder. I'm also suprised that with the checks you ran that you're not seeing the evidence of any fowling on the plug. Too much fuel, or incomplete burn would both show some evidence on the plug. And if the problems getting worse, than there should be more evidence of a problem. So my question is, when you pulled the plug wire, was the spark on #1 as bright a spark, or as loud a crack as the others while the engine was running?
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Old 07-31-2007, 09:22 PM   #8
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Or if you don't want to try unplugging them you could try to reach them and put a screwdriver on em, and put your ear up to the end. You should hear them clicking. Its them opening and closing, if there is no clicking, you've found your stuck injector.
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Old 07-31-2007, 09:23 PM   #9
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Quote:
Is there a chance that your coil pack is weak/damaged. It may be providing power to the spark plug, but if its a weak signal, or not enough power, then it won't give a complete burn in the cylinder.
I thought of the coil pack i have msd and the plug does wiggle a bit.. but my thoughts on this is that i would have problems all the way across the board not just at idle..

Quote:
I'm also suprised that with the checks you ran that you're not seeing the evidence of any fowling on the plug. Too much fuel, or incomplete burn would both show some evidence on the plug. And if the problems getting worse, than there should be more evidence of a problem. So my question is, when you pulled the plug wire, was the spark on #1 as bright a spark, or as loud a crack as the others while the engine was running?
I didnt pull the plug to check for spark just the plug wire.. and got a strong snap.. just like the others.. but i did pull the plug and compare it to the other plugs.. looked just like the others not quite as white but really close and it ws a bit shinier not wet shinier...(not sure wut that means)
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Old 07-31-2007, 09:23 PM   #10
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if the tail pipe sucks your hand to it then that usually mean there is a leaky valve.

get ride of that msd and get you a motorcraft, lol.

you can unplug the injectors electrical connection and that will stop that injector from firing. you can also use noid lights to check the pulse width of the injectors.

how did you tune out your o2's and what kind of trouble were you having. mine isnt working either. i cant get it to work. and mine is having trouble a lot like yours. but it runs fine except for the excessive fuel at idle. other than that perfect. sounds like we have kinda the same problem.
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