Misfire/Backfire...Idles like crap
 

Hey guys

The car has been having a small idle surge from 500rpm to maybe 1500rpm

I was driving home friday from work and was under light acceleration and the car would jerk. So I when and replaced the spark plugs (gapped at .028). and It drove home just fine. Had a few pops but no jerks idle was better. "Did pull p0136 before I drove it home, deleted it, didnt show up when I got home.

Started it this morning and crap idle was back and I could hear the misfires. So I shut it off and check for codes....nothing. Let it warm up was backing out of the drive way and big backfire.

So my Question is what is causing all this. Boost leak, vac leak, bad injector, running rich???

Help shes my DD

Re: Misfire/Backfire...Idles like crap
 

What do the plugs look like? Dark soot? Could be running pig rich, but it could be a heavy vacuum leak as well.

Re: Misfire/Backfire...Idles like crap
 

I switched them out. I will post pitures of them when I get home from work.

Re: Misfire/Backfire...Idles like crap
 

Did a boost leak test last night. 1 or 2 injector seals were shot to shit, replacing all 4 after work. Biss screw was leaking cant get it out, so how do I fix that one? any other thoughts?

Re: Misfire/Backfire...Idles like crap
 

Is the biss stuck/phillips head stripped or can you screw it all the way out? If it screws all the way out then get something sharp and poke it and pull it out. Its only plastic.

Re: Misfire/Backfire...Idles like crap
 

I can back it all the way out. Thanks for the idea

Re: Misfire/Backfire...Idles like crap
 

If you got a P0136 code, you should investigate that first:
http://engine-codes.com/p0136_mitsubishi.html

I'm sure one of those things is your problem.

Re: Misfire/Backfire...Idles like crap
 

Sweet man thanks

Re: Misfire/Backfire...Idles like crap
 

The P0136 is usually going to be related to any boost leak. I would get the vehicle all sealed up and clear it and it should be a non-issue. As far as the BISS, do whatever is needed to get it out and replace the screw and oring together.

Re: Misfire/Backfire...Idles like crap
 

Ok so last night I replaced all the injector seals, and did a boost leak test....Fixed the leak. Might have a small one where the J-pipe connects to the turbo. Sent to start and got the firing order mixed up, fixed it and the car started up. It idled like grap and was on constant misfire. while it was running pulled off the injector plug-in injectors 3 and 4 were not firing. Pulled all the plugs they are black and some wet (rich). Did I foul out the plugs when I messed up the firing order? Whats going on now?

*I did remove the BISS screw and replaced the O ring at 2 turns out....waiting on the new screw.

Re: Misfire/Backfire...Idles like crap
 

Hey guys I got an update for you. So last night I went and got a compression tester. It was going great until I got to cylinder 3. My compression was 155 30 141 152 the 30 became 40 when I did a wet test. So I am in the process of removing the head, and will determine what exactly it is from there. Ill heep you guys updated.

*Anyone who wants to wrench pm me. I have beer!!!

Re: Misfire/Backfire...Idles like crap
 

Ok so another update. I got the head off last night, and as you can see cylinder 3's valves just dont look quite right. The piston and cylinder itsellf are fine. I havent done any tests to so see if I fried the rings.

http://www.dsmtuners.com/gallery/sho...mageuser=91780

Re: Misfire/Backfire...Idles like crap
 

post pics plz

Re: Misfire/Backfire...Idles like crap
 

Im trying...how do I turn my pic into a URL

Re: Misfire/Backfire...Idles like crap
 

upload it on facebook, imgur, photobucket, flickr, etc. or on here in the gallery by clicking on "gallery" on the top of the page.

Then once you have the pic url, click on the little box with the mountain in it when you go to post.

Re: Misfire/Backfire...Idles like crap
 

http://www.facebook.com/media/set/?s...type=3&theater

Hope this works

Re: Misfire/Backfire...Idles like crap
 

Your facebook link isn't working.

Re: Misfire/Backfire...Idles like crap
 

damn can't see pic and was hoping to help.

Re: Misfire/Backfire...Idles like crap
 

http://dannynoonan12.imgur.com/all/

Please work

Re: Misfire/Backfire...Idles like crap
 

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