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A piece of electrode may have gotten caught between a valve and its seat. I personally have never sean it happen in the 25 years I've been doing this...but I have heard of it.
There may still be a problem with the valve train like a sticky guide or a bent valve. I have seen this happen but it is usually accompanied by some noises in the top of the motor. I don't know if this is common on the 3800.
Last edited by Rico; 03-16-2012 at 04:31 PM.
theres no diffrent noice to it, im so frustrated with this thing
Look at it this way. If this is the worst thing that happens to you in your life then you'll have a really good life! And your learning a lot, right?
I had two 3800 motors go out in one month, by GPGT and my girlfreind's firebird! You talk about suck!
Anyway, you might have to bite the bullet and remove the head.
yea thats what it is looking like thanks for everyones help, where should i get another head?
ebay?
Yea, Good 'ole Ebay.
You could try Morad in Ohio. That's where I got my last short-block. They have a ton of parts. In fact I don't think anyone else in the country has more 3800 parts than them. You could also check a local junk yard but they're usually unwilling to separate the heads from the motor.
First things first. Get that head off and see what the shiz is.
Ehhh just throwing this out there. and I'm not sure if you did switch injectors... but... If the injector was shooting too much gas into the cylinder it would wash down the cylinder and lower the compression, and make it miss at idle(too much gas to fire). It wouldn't miss under load because the car would then need the extra fuel.
thanks i will try that would it make exhaust smell really really bad
how would i tell if it switched with out a scanner, also if i pull the plug the car idle doesnt change?
Anyone else have that problem with a injector???
Switch the #3 injector withn any other injector, unplug the battery to clear the current codes, then drive it. when the light comes back on take it to advanced and have them scan it. Should be free. if the misfire jumps from #3 to where you moved it, you'll know it is the problem.
And yeah it can make the exhaust smell bad.
Pulling the plug won't tell you anything because you'd be going from too much fuel to no fuel... either way it wouldn't fire.
I see what 99grandprix is saying. A dead injector at idle would have way to much fuel to fire so the idle may not change. Of course low compression will do the exact same thing.
I guess this is a possiblity. Who knows, maybe you won't have to pull the head. But I don't think extra fuel in the cylinder would drop the compression from 170 down to 60psi.
Easy check, pull the fuel pump fuse, pull the #3 plug put a little oil down the cylinder crank it a few times(it will coat the cylinder wall with oil & squirt out the excess) then do a compression test. If compression jumps up to where it should be... then you know.
im gonna switch the injector around tomarrow see where that gets me, if it was a valve i would think it would run bad all the way though rpm range but only at idle and it would come and go
I hate reiterate what other people may have already commented on but I think you should check to see if your oil smells like gasoline. With a dead/stuck open injector the excess fuel will make its way down into the crankcase.
If you don't have any luck with swapping the injector I would suggest checking the pulse signal from the PCM like we discussed on an earlier post. If the problem is something with the PCM then swapping the injector may not tell the whole story. You'll have the same results with a different injector on #3 cylinder.
thanks ill check it out
why
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