plug wire diffrence

[screamin86]

I changed the plugs in my 03 yukon today and one of the wires pulled apart so I stole one off of the 01 5.3 I have that to swap into my thrdgen and its short like iits barely cliped on the coil. Was there a diffrence in length for plug wires for thses years? The wire fit on the 01 motor fine.

[oleshifty]

99-02 are about an inch shorter. the cars were even shorter then that.


i run 03 wires on everything, like having the extra room to work with.

[screamin86]

Well looks like I'm gona head to the parts store in the morning and see if I can pick up a decent set of wires. I can't tell if the plugs fixed my mis or not. At first I thought so then it started idling rough again after 30mins or so but it could be that short plg wire not getting good connection or I didn't get one snapped on good enough. :/

[oleshifty]

i know at AZ, the wires for the 03's are actually like 20 cheaper then for the 02's. Either should work though. I don't think there's any actual difference in the motors. I actually have 99-02 wires on mine now, they are tight, but fit.


Might be the coil itself. might wanna swap it and see if that helps before buying wires.

[screamin86]

Well one ill have to buy some wires regardless since now the motor I'm using for my swap is missing a wire and it bothers me knowing I have a missmatched wire on my yukon lol. Another thing is idk which coil could be at fault. I kept all the plugs and numbered them so I know where they came out ill post pictures of them when I get off work. I didn't know what the firing order for a lsx motor was right off so I numbered them like a old sbc when I pulled each one. The driverside plugs had much more soot than the pass side plugs. I had also started blowing black smoke since this code came up and with it idling over snow the snow would get covered with soot. After I changed the plugs out today it seemed to start easier and idle smoother especialy after I let it warm up then reved the snot outa it a few times and covered the snow in my front yard with soot!

[oleshifty]

each coil is above each cylinder... the order doesn't really matter

if you're getting a po300, its random misfire, probably not any particular plug/wire/coil.

If its a Po30# that cylinder has mis. (be it plug/wire/coil). I'd do plugs/wires first. Especially with your mileage. If you still have a light, and it's a specific cylinder try the coil. Could also be an injector, thought kind of unlikely.

check your pcv, if that year still has one. I checked my moms other day, and it was missing the check valve...explains why her truck has been going thru oil between changes. That's only thing I can really think of that would cause "soot" unless you accidentally put diesel in it

[RedHeartbeat]

Sounds like an o2 sensor crapped the bed.

[screamin86]

Found a lose plug wire last night fixed it ans still smokes black under throttle. Codes are p0300 and p0131 pre plug change going again now to get them checked again.

[screamin86]

Getting p0171 now also

[gavin05]

p0171 is system to lean bank 1 i think.check for vacuum leaks or dirty maf