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Old 09-22-2018, 05:17 PM   #1
JooktheSnooke
 
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Angry HELP! Engine misfire after cam install

Hello all!
Ive been reading these forms for a while now...and just became a member. Therefore, this is my first post and i can really use some guidance with my 2010 camaro ss.
I just finished doing the cam install in my ls3. I need some help The cam is texas speed & performance, stage 2, 229/244 .629"/.615" . included with the cam I also installed a new oil pump, timing chain and sprocket, lifters, push rods, valve springs, rockerarm trunion upgrade, got the heads cnc ported, spark plugs, and long tube headers.
When i went to start the motor for the first time, it was misfiring a lot through the exhaust. it sounds like gun shots. The check engine light came on with code P0300 (multiple cylinder misfire) after this happened, i removed all the spark plugs and found them to all be soiled except for cylinder # 1 & 5. I checked compression on all of the cylinders, they were all at 190 psi except for 1 &5, they were at 170 psi. after doing that i checked for spark on all coils, spark plugs, and spark plug wires. All was good there. Fuel injectors were also good, because i made sure they all sprayed doing the cam install. I am not sure if this is happening because of push rod length, or if the valves are not seating correctly. Or if the car just needs a tune to fix the problem. I read some forums on here about the misfire issue, but most of them talked about the check engine code.
Any advice or guidance would be greatly appreciated
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Old 09-22-2018, 05:59 PM   #2
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Try charging the battery.
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Old 09-22-2018, 06:01 PM   #3
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Your coil plug harness is probably plugged in upside down. This seems to be a easy mistake after cam install. Hopefully your timing is set correctly and its a easy unplug and flip plug and connect it again.

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Old 09-22-2018, 07:02 PM   #4
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Quote:
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Try charging the battery.
the battery did die when i first tried to start the car. she has been sitting for a while due to a bad oil pump. thats what started this while chain of mods. how would a weak battery cause this to happen?
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Old 09-22-2018, 07:07 PM   #5
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Quote:
Originally Posted by Zl1dad View Post
Your coil plug harness is probably plugged in upside down. This seems to be a easy mistake after cam install. Hopefully your timing is set correctly and its a easy unplug and flip plug and connect it again.

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ur talking about the big plug that sits right on the coil bracket? doesnt the harness only plug in one way? i believe its correct bc it has that green plastic safey clip to assure the plug doesnt disconnect
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Old 09-23-2018, 02:18 AM   #6
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bump. any other advise? would really like to get this solved.
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Old 09-23-2018, 06:05 AM   #7
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ZL1Dad may be onto something..

https://www.camaro5.com/forums/showp...postcount=1663

Verify first...

Also, I didn’t see where you uploaded a tune for the changes — including the headers. Did you upload a tune for your upgrades?

Best DIY for cam install:

https://www.camaro5.com/forums/showthread.php?t=125123

Verify install with this guide...

-Don
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Old 09-23-2018, 10:12 AM   #8
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When I did my cam install on my truck about 5-6 years back I had a similar issues. Turned out I had a bad spring and lifter over #4. Changed out the BeeHives to Comps dual spring .660 lift and lifters and haven’t had an issue since


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Old 09-23-2018, 01:56 PM   #9
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Quote:
Originally Posted by hammdo View Post
ZL1Dad may be onto something..

https://www.camaro5.com/forums/showp...postcount=1663

Verify first...

Also, I didn’t see where you uploaded a tune for the changes — including the headers. Did you upload a tune for your upgrades?

Best DIY for cam install:

https://www.camaro5.com/forums/showthread.php?t=125123

Verify install with this guide...

-Don
i marked each plug before i took the coil harness off. are the left and right harness the same exact? or does what side they go on make a difference? i will have to double heck this. also that is the exact form i followed. got those books too
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Old 09-23-2018, 02:42 PM   #10
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does the color of the wires in the coil harness indicate what plug goes to what coil? for example the purple blue green and red wires. im asking bc how would i know if i had the harness on backwards or on the wrong side?
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Old 09-23-2018, 03:19 PM   #11
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Same harness but can be put on backwards... It happens.

Also, a tune should be updated to accommodate the new cam/headers...

-Don
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Old 09-23-2018, 03:46 PM   #12
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Quote:
Originally Posted by hammdo View Post
Same harness but can be put on backwards... It happens.

Also, a tune should be updated to accommodate the new cam/headers...

-Don
do u know the order of the colors for each side? is it:
drivers side passenger side
cylinder #1 #3 #5 #7 #2 #4 #6 #8
wire color P B G R R G B P

i just looked at my harness and i have both sides the same direction so then maybe its as simple as flipping the one harness 180*?
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Old 09-23-2018, 03:58 PM   #13
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I have the updated coil harness so colors are different. Don’t have the old one to compare. May be that simple...

I think pink, red, brown, black are for #1 and #2

-Don
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Old 09-23-2018, 10:45 PM   #14
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Zl1dad is the man!! That was exactly what the problem is. Had the harness plugged in backwards. Flippedt it around and she runs great. Gotta get the tune now. One small issue however was the anti freeze wasn’t flowing through the block. When I was doing all the work I drained the block and after just filled up the radiator. Is there a bleeder on the block to bleed out the air to allow the anti to flow? Or is there another method to use to do this? Thanks again for all the help
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