Stumble when floored
01-01-2005, 07:37 PM
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Stumble when floored [FONT=Times New Roman]2000 SS Camaro, new filters, O2 sensors, Taylor wires, SLP air lid, new plugs and recently reflowed injectors. One bad and two weak, real bad stumble before the rebuilding of the 26.6 pound injectors. Spins to 6, 200 rpm easily, but if floored it will stumble sometimes. Six speed and the plugs are Split-Fires and no misses at any steady rpm, 2,000; 4,000, or 6,000.
Little bit of an itermitten idle, but most would not notice it. No codes ever. Car is quick, blip the gas in 1st or 2nd on a roll, it will spin the tires endlessly. Yoko ES-700 tires on stock 17" SS rims
Little bit of an itermitten idle, but most would not notice it. No codes ever. Car is quick, blip the gas in 1st or 2nd on a roll, it will spin the tires endlessly. Yoko ES-700 tires on stock 17" SS rims
01-01-2005, 09:45 PM
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how many miles, and did it stumble before or after the injector rebuild, or both, i wouldnt rebuild them, buy bigger ones IMO, what kind of octane are you using, if you have high mileage you might have excessive carbon build-up, though its possible to have carbon build-up with low miles too
01-01-2005, 10:17 PM
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Originally Posted by LiquidFire350
how many miles, and did it stumble before or after the injector rebuild, or both, i wouldnt rebuild them, buy bigger ones IMO, what kind of octane are you using, if you have high mileage you might have excessive carbon build-up, though its possible to have carbon build-up with low miles too
Its bone stock except for the air lid, and larger injectors, say 28.8 would required remapping the ECM. If this was 500 hp I would, but through the cats and cross-flow mufflers from GM, its a 325 hp car. 94 octane and I don't have a detonation issue. Just stabbed the pedal at 2,000 or 4, 000 rpm and it spits for a second. Gradual acceleration no stumble. Plus I'm in the right gear 1st or 2nd from a roll. No misses to 6, 500 rpm.
rick
01-01-2005, 10:21 PM
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Originally Posted by nikon1999
your fuel pump could also be having issues
rick
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01-01-2005, 10:36 PM
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Originally Posted by LiquidFire350
have you double checked the resistance of the injectors sence the sumble came back?
If I plug it into a Snap-On computer, I'll be $100. poorer and even then I'n not convinced they find any codes? It does not appear to have any vacumn leaks. Idles at 750 rpm, but if I listen real close, seems like a slight variance in the idle every 20 seconds. Most would never notice the slight change.
Rick
01-01-2005, 11:37 PM
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I have seen split fire/bosch plugs cause this same condition at my shop MANY times. It sure would be cheap to swap in some AC Delco or NGK TR plugs just to check wouldn't it?
01-02-2005, 02:16 PM
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Originally Posted by ss rally red
I have seen split fire/bosch plugs cause this same condition at my shop MANY times. It sure would be cheap to swap in some AC Delco or NGK TR plugs just to check wouldn't it?
Old AC plugs at some wide gaps at 55K, what would you recommend as one or two is hard to reach. I'd hate to do it again? Then again, I'd do it every few years, not to lose races.
What's the best plug for complete firing?
Had to think quick with a Turbo Eclipse the other day. Once 6 cars in front, SS badges on the rear, kept him honest.
Rick
01-02-2005, 03:43 PM
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A friend of mine had this problem with his car, it'd go to redline fine, but if you floored it, it would stumble. Turns out, one of the terminals on the battery was loose and when he'd floor it, the force would cause it to move just enough to lose contact. It's a longshot, but could be something as simple as that.
01-02-2005, 06:24 PM
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Originally Posted by r.states
If I plug it into a Snap-On computer, I'll be $100. poorer and even then I'n not convinced they find any codes? It does not appear to have any vacumn leaks. Idles at 750 rpm, but if I listen real close, seems like a slight variance in the idle every 20 seconds. Most would never notice the slight change.
Rick
Rick
try the batter cable first, stick with the simple stuff before you start spending money
