Synacks

I'm slightly mindboggled by the fact that I left my car in a cozy garage for a long weekend (5 days) and come back to it making slight hesitations and stumbling into work.

Car was street/dyno tuned by Vengeance within the past month (wouldn't even consider it to be a problem with the tune though because it ran great up until now)

NO CEL's whatsoever - 2009 27k miles

Symptoms:
1. Idle sucks, car has mild shaking, A/C makes it worse.
2. Light accel and Low RPM hesitates but eventually evens out but not great
3. Giving it decent throttle and it clearly has a bit of reduced power, and also hesitates sometimes.
4. Highway speeds in higher gear seemed OK but I wouldn't use that to make any guesses.

Plugged in Torque OBD reader and the front OBD's seemed fine, voltage was fairly consistent and followed a consistent pattern with each other. Rear OBD's are disconnected but that doesn't mean anything. Inspected the MAF was secured, it was. Coil packs appeared to be on correctly.

The only thing I can think of was maybe bad gas? It felt like it would throw a CEL at any minute but it drove for 90 minutes today without any indicators popping up.

ATC399

I think you nailed bad gas...good luck

MTPZ06

Check plug wires...make sure they are seated on the plugs and the coils. They sometimes pop off of the plugs but still look seated.

Synacks

Funny, I checked the passenger side earlier at work because I replaced a plug on that side recently. Just went to check the other side now that is cooled off, I pulled the plug wire off the top of cylinder 1 and the bottom side just fell off the plug with zero effort...

Made sure all 8 were seated at top and bottom, drove around a bit and it's perfect again. I guess it got knocked loose somehow and I drove 90 miles on 7 cylinders today. Or something.

Recommendations on a better set of wires that actually hold on good?

MTPZ06

Nice...always good when its something simple. I like the GMPP red wires...great quality, not overly pricey.

Mordeth

MTPZ06, very nice, quick diagnosis and fix. Aside from a few rogue trolls, I am very appreciative of how everyone helps each other here over the years. There is so much knowledge and most share it with nothing to gain. Very humbling.

Glad you got it sorted OP!

Synacks

Got a link or part number?

When I search I find Granatelli and ACDelco.

Synacks

Thanks, and that's the way we should keep it.

In the end we all just want our cars to run smooth and pull hard.

MTPZ06

I believe they are GM part#12495519.

AzDave47

they are the best wires for the money and better than almost all aftermarket wires.

Travlee

found this, even eligible for prime if you have it

Synacks

Thanks all. Narrowed my search down to these two. One is obviously GM but has higher resistance. The others, Taylor and Summit aren't GM, but great reviews and low resistance.



https://www.summitracing.com/parts/tay-84244

https://www.summitracing.com/parts/sum-867828r


You guys tell me which one and it's bought, they are all affordable. I just want long lasting, holds on tight and fits well, and smooth operation.

Travlee

i did the taylor's on mine, no complaints

Durien512

love to see when its something simple and easy ...

z06clif

..... Ive seen this many times on my car once but other cars many times. doesn't have to be a Z06 either . any Vette will do it. Seems like that air is built up in the spark plug boot and it heats up cause the plug clip to expand. I always burp the boot with a paper clip. By that I mean I get the air out of the boot and seat it that way.

Clif

dkz

always wondered if you are supposed to hear two clicks when you push into coil?

ratomicZ06

This exact thing happened to a wire on my mc after changing plugs! I just pinched them to burp. Great tip!

Unreal

I've ran just about every plug wire known.

OEM, GMPP, Taylor, MSD, Autozone, Firecore.

In order of best to worst IMO
Firecore, GMPP, Autozone, Taylor, MSD

All work fine.

z06clif

That works Low tech......cant beat it

Clif