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Chevy Aveo Misfire or Normal

12 messages,  Last post on Apr 25, 2008 at 5:24 PM

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#5 of 12 Found a Tool by luckins Feb 21, 2008 (4:00 pm)
I found a tool that is all one assembly and I may get that and use that to tighten while using the regular socket wrench to loosen them. I might not be able to do it for a day or two. So, I hope that one plug doesn't blow out and I can get the wires off the other three. I put silicone on them, so I think it'll be alright, plus, they're new.
#6 of 12 Chevy Aveo Misfire / Hesitation: Check your valves! by mc_ensor Mar 11, 2008 (9:33 am)
I've been to a few aveo forums and seen a lot of threads concerning misfires and such. I had the same problem with my '04 aveo and finally figured it out!!! I got the run-around from 4 places before somebody diagnosed it right. It started for me with a check engine light: code p0300, I think. It's a "random multiple-cylinder misfire" code. I lost a lot of hp and had a nasty hesitation. Turns out, engine valves were the ticket. A valve went to shit and that allowed oil to leak into the spark plug, fouling it out. Somehow, the O2 sensor got screwed up also. All together, it ended up costing me just under $700 for a good fix. New valves, plugs & wires, a new O2 sensor, and an injector service for good measure. Hope this helps! Replies to this message: luckins (Mar 12, 2008 4:59 am) mc_ensor (Apr 25, 2008 8:33 am) luckins (Apr 25, 2008 5:24 pm)
#7 of 12 Re: Chevy Aveo Misfire / Hesitation: Check your valves! [mc_ensor] by luckins Mar 12, 2008 (4:59 am)
Replying to: mc_ensor (Mar 11, 2008 9:33 am) Thanks! I don't actually get a code on my misfire and I'm aware of the valve problem. Actually, the misfire is, more or less, taken care of. I put new plugs and wires on it and made sure they were snapped in tight. I also took it on a very long drive and I think that helped with some gas contamination that might have gotten into the tank while it was at the dealership. I still might need a fuel injection service because once in a while, I will feel a miss, but it's very minor. It also doesn't hesitate as much. But, things change from day to day . One day it can be perfect, the next day less so. Replies to this message: mc_ensor (Apr 25, 2008 8:33 am) luckins (Apr 25, 2008 5:24 pm)
#8 of 12 Framington by framington Mar 27, 2008 (1:17 pm)
Check engine light came on, went to Dealer for the 07 Aveo with 6000 miles on it. They said there was a misfire. They said needed a valve. They replaced the head (took 10 days to fix because all parts had to come from Korea). Dealer manager said the new valves have been redesigned due to defective valve causing carbon build-up and weak valve springs. A month later back to the dealer with what I thought was a blown head gasket (loud noise and fluid leaking). The service manager claimed a spark plug was not installed properly. But how did that account for the fluid leak? He said problem may return even though valves redesigned. Another 10 days for service; for a spark plug? He suggested STP or other type gas treatment put in quarterly. Any other suggestions? Replies to this message: busiris (Mar 27, 2008 2:16 pm) luckins (Mar 27, 2008 3:49 pm)
#9 of 12 Re: Framington [framington] by busiris Mar 27, 2008 (2:16 pm)
Replying to: framington (Mar 27, 2008 1:17 pm) My suggestion....Get another dealer!   Loose/bad spark plugs DO NOT create fluid leaks!!!!   End of story.
#10 of 12 Re: Framington [framington] by luckins Mar 27, 2008 (3:49 pm)
Replying to: framington (Mar 27, 2008 1:17 pm) I agree, a bad or mis-installed spark plug would probably only cause a miss, if even that. And, how does one not install a spark plug right unless it's just loose? I mean, they only go in one way? And, there's no fluid involved with it whatsoever. I'd bet that they didn't put the head or head gasket on correctly when they did the valve job.   GM says not to use those additives. I've used them and they can actually make a problem worse. All most of them are is soap that can be put in the gas tank. And, they only work for fuel-related problems, not bad valves.   I know these cars can have valve problems, but, in honesty, it's not a common occurrence considering all the Aveos out there with well over 60,000 miles, now, who haven't had this problem at all. If what that dealer said was true, a lot more Aveos would be coming into the shop and people wouldn't be getting a run-around like I am hearing.
#11 of 12 Re: Chevy Aveo Misfire / Hesitation: Check your valves! [luckins] by mc_ensor Apr 25, 2008 (8:33 am)
Replying to: luckins (Mar 12, 2008 4:59 am) I did the same deal at first. Replacing the plugs / wires worked temporarily for me as well, but the problem kept returning. Once the valves allow enough oil into the plug sockets, you'll have to replace them again and again. Replies to this message: luckins (Apr 25, 2008 5:24 pm)
#12 of 12 Re: Chevy Aveo Misfire / Hesitation: Check your valves! [mc_ensor] by luckins Apr 25, 2008 (5:24 pm)
Replying to: mc_ensor (Apr 25, 2008 8:33 am) I actually took it in to have a fuel injection service and now it runs almost perfectly. I does have a funny hesitation thing, sometimes, when I first start it, but otherwise, it's about as good as a car with MPFI can get, I think.

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