So the cobalt is throwing some codes: 2135, and 1681. It only does this in the morning when I am warming it up, never any other time. Did some research, and I am looking at replacing the pcm, or the throttle body. I know the tb is clean, was cleaned a couple months ago.....any thoughts where I should start??

 

start with the TB

 

Start small and work your way up.

 

Mine keeps throwing engine lights for P0300 random multiple cylinder misfire, engine light comes on, goes off, comes on, my scanner says its always pending. Anyone else have this problem? Thanks

 

What size injectors? Typically youll see random misfire happen when you have larger injectors.

 

Stock injectors

 

Mine was doing that, then it went to a 0301 cylinder one. Valves were burnt, and all busted.

 

lol it def. shouldnt be doing that on stock injectors...

 

Niiiiiceeeeee..... should I rip out injectors and take a peak, or WOT all the way home hopeing it goes boom?

 

Nah, check gaps, get better fuel, clean maf and air filter. Just do some maintenance on it.

 

MAF and filter get checked/cleaned monthly, I am currently attempting to remove the stripedstart bolts on the coil pack cover

 

HAHA yah I took that thing off and left it off. Get some socket head cap screws and be done with those. Also replace fuel filter if not done.

 

still giving P0300 code, went up to the Grand Canyon this weekend, it threw a P0170 but I think it was due to elevation and temp change.... Whats next, this P0300 is ticking me off royaly.... Plugs are gapped at .04....

 

Thats your problem.... try gapping them closer. Try .032

 

thats where they where gapped, then I read .04, then .045, so idk....

 

no way .40 or higher keep them at .32. May be the coil packs.

 

How could I check those, all I have as a scanner is the torque pro app, its saying thers up to 80 missfires a min, but it usually stays between 2-15

 

Jesus! hmmm. So the plugs are new? You running 91? Where do you get your fuel?

 

91 from QT

plugs have 5000 miles at the most, replaced in july ish

 

When you took them out how did they look?

 

I would check each coil pack closely. My wife's Fit had a coil pack issue and it would misfire and stutter constantly. When I pulled the coils, one of them was actually cracked. Didn't catch it until the 2nd time around after I had put some dielectric grease on them. The grease on the bad coil had gone from clear to brown. A somewhat common issue with Fits, but doesn't mean it can't happen elsewhere.

Figure if the plug is fine, then something else could be causing it not to fire properly. Good luck!

 

You can check the coil by moving it to another cylinder and seeing if the misfire changes cylinders...if it does...boom....found a bad coil. If it turns out to be a coil I have 4 laying around with only 16k miles on them....

 

I have 4 with harness 15k.boom that just happened lol .actually I might have tossed them along with a bunch of other lsj.lol

 

I don't have the harness anymore....someone bought it but didn't want the coils...figure I'd keep em around just in case...lol

Updated review on those Kumhos you got? lol....gonna be getting something prob by the end of this month....rolling around on like 2/32 on current tires...lol

 

waiting at Microsoft store for my limited edition