Thread: LS - misfire
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Old 11-26-2013, 05:35 PM
itstomd itstomd is offline
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Re: LS - misfire

I switched out the coils #2 was some aftermarket coil green sticker looked new. Once changed #2 does not come up as misfire..

#5, no so lucky no change. That coil was changed too.. pulled plug it looked new and awfully clean ( the electrode to this plug is a tiny point gapped ok) , lil tiny carbon around the bottom. It was not wet, very dry.

The valve cover on the drivers size has let go on about 2 bolts for the coil cover. So that was missing.

Noticed some "rust" looking color on the coil wire on #5 as if it was stained with rusty water. The connector looks fine, although i broke the locking clip. i made sure it was on all the way during tests however. The injector wire clip i broke. still could not get off the injector wire to make sure its ok i am assuming its ok..moving the wires around i got no change in running so i dont think its an injector.

Another interesting observation, I can feel the miss now at idle. and it throws the p035 code for missing #5. I cleared the code turned off the car. Then i reconnected to make sure no codes were thrown. I then started the car but held it at around 2000 rpm where the miss seems to clear out. The code was not thrown i ran it at 2k for at least a min ( at idle the code comes up right away). So holding at 2k it did not throw the code once it goes back to idle code is thrown. maybe this is too fast or takes longer for the system to decided if its missing.

In addition when you first start it you cannot feel that miss as that the car is in a "higher" rpm when you first start. As the rpms come down to idle, you can feel that miss come in. SO it almost is like the injector has a "idle" mode in which maybe thats the miss. ( i keep saying this is just like a bad injector on my mustang i had, but missed thru the entire rpm range..)

I think the first thing to do is figure out if i am getting signal into the injector and the coil. Can i put a meter on these wires to check for signal?

Lastly you put it in gear, you feel the miss slightly.. You give is some gas like to about 1500 rmp 2000 rpm. you dont feel that miss.( may this engine is really balanced and its there just dont feel it)

overall it seems its an injector.. but maybe someone out there has a better idea ...

thanks so much!
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