Engine Missing - Chevy Colorado & GMC Canyon

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Old 04-20-2008, 11:00 AM   #1 (permalink)
bln
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Default Engine Missing

My 05 recently has been shuddering in 2nd and 3rd around 2000-2500rpm but stops at higher rpms . Yesterday, I was driving on highway about 70 mph and shuddered in 5th. The check engine light came on briefly. The plugs olny have about 5000miles, oil & filter changed last month, and changed fuel filter. I use middle grade gas. I don't think it is fuel pump. Anyone have any ideas. Gotta visit shop I guess
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Old 04-20-2008, 08:59 PM   #2 (permalink)
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Default Re: Engine Missing

check your vaccum lines, there might be a small leak only exaggeated at those rpm's.
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Old 04-21-2008, 08:27 AM   #3 (permalink)
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Default Re: Engine Missing

Don't use higher than 87 octane unless you have a tune. You'll cause a carbon buildup and problems with your engine.
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Old 04-21-2008, 11:02 AM   #4 (permalink)
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Default Re: Engine Missing

Quote:
Originally Posted by rangerbob
Don't use higher than 87 octane unless you have a tune. You'll cause a carbon buildup and problems with your engine.
Thats not necessarily true. I've used 93 octane for nearly 60k miles and haven't had a single problem. And my plugs didn't show any signs of any problems when I swapped them at 30k miles (even though I need to check them again when I go to Iridium plugs).
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Old 04-21-2008, 11:27 AM   #5 (permalink)
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Default Re: Engine Missing

The carbon doesn't build up on the plugs. And it is true - plenty of folks here have had this problem when running higher octane. Go do some research about it.
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Old 04-21-2008, 03:42 PM   #6 (permalink)
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Default Re: Engine Missing

I've read about the cons, but I've also read that some people haven't had a carbon buildup problem with the higher octane (even though those that have had problems outnumber those who haven't by a large margin). It can still be cleaned using a high-end fuel system cleaner. I've read articles written by people who don't believe it makes a difference in performance or efficiency (I do know that I went from regularly getting 20 mpg to 22 mpg; can't speak numerically for performance). I know that the vehicle manual also says to use low grade octane (preferably 87 octane). And I know the carbon wouldn't necessarily build up on the plugs themselves (mostly on the back side of the valves), but the plugs wouldn't wear right or leave a good burn pattern either.

I am going to be tuning for the higher octane here within the next month or so anyway. I've got the HPTuners software and finally starting to get the hang of tuning (very slowly and not a master by any means, but coming along nonetheless).





(Off topic rangerbob, but PM me if you're still making wiring harnesses. I have a question or two for you.)
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Old 04-21-2008, 06:50 PM   #7 (permalink)
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Default Re: Engine Missing

Get the CEL light code retrieved @ AutoZone for free. Report back.
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Old 05-05-2008, 05:13 PM   #8 (permalink)
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Default Re: Engine Missing

Not trying to cause panic but you may want to read my post. http://www.coloradofans.com/forums/v...hp?f=8&t=60296

I just posted a thread with similar symptoms of which I called a 'fluttering' or a 'feathered' feeling in the acceleration and major loss of acceleration power. I have an 05 I5 Coly with 100k and have had it to the dealership many times about this problem of which they have replaced several things from a gas cap to a new cylinder head. I thought it was fuel/air related as well. I'm not saying this isn't but it happened again last weekend and at the same time I lost 3rd and 4rth gears. It's at the dealership now and if the 'fluttering' is related (i.e. trans slipping or voltage loss) they better cover the tranny rebuild under warranty!

Your shuddering description sounds all too close to mine. I hope in your case it is not.
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