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#1 |
Registered User
Join Date: Oct 2004
Location: Roma,TX
Posts: 774
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Truck feeling really heavy
Whats up guys. I took my truck out for a spin today (hadn't moved it in MONTHS so it had a little bit of old gas in it). I put some 87 octane gas and went to try it out. It is feeling really heavy at the lower rpm's/off idle, its not responding how it should to throttle. Uptop it feels strong and fine, but down low its almost like its going at its own pace.
I'm thinking the carb (stock quadrajet) tuning may be a little off ![]() Here is a vid, I got flowmasters and you can hear the engine not really reving up quick. At the begenning I didn't really lay into the gas, but I was still on it pretty good, around 1/2 throttle maybe more. But the engine is climbing up really slow. It got to me and I floored it right before the hill, felt stronger there. But still the low end is horrible, it wasn't like this before ![]() ![]()
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1978 stepside C10 build: http://67-72chevytrucks.com/vboard/s...d.php?t=468265 |
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#2 |
dang its hot
Join Date: Nov 2006
Location: frankfort kentucky
Posts: 1,349
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Re: Truck feeling really heavy
make sure you don't have a dragging brake
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#3 |
Sb 400 club
Join Date: Nov 2005
Location: NH / MA
Posts: 2,743
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Re: Truck feeling really heavy
hmm it is hard to tell in the vid man. Really cool you took one and all but hard to hear over the wind noise. Draggin brake would definatly do it but is the motor running sluggish? idleing weird? still useing old gas?
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![]() ![]() 77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363 1956 Willys Wagon (327 chevy) Project (Now Buick 225) 1980 Corvette L-48 4 speed 1992 Mustang GT built 5.0 5 speed ![]() 1985 C10 LWB Sold 1982 K10 SWB plow truck Parted out 1986 D30 M1028 fire brush truck Parted out |
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#4 |
7000 #'s of american IRON
Join Date: Dec 2004
Location: north tx
Posts: 883
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Re: Truck feeling really heavy
How old is the gas? Sometiome this year the stations around here switched from pure gasoline to a E10 mixture- 10% ethanol 90% gasoline. My truck hasn't been the same since (454).
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#5 | |
Registered User
Join Date: Oct 2004
Location: Roma,TX
Posts: 774
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Re: Truck feeling really heavy
You know what, that could be it. I know that when I brake it pulls to the left side really quick and sudden. I thought that could be cause by the fact that I'm running a taller tire in the front-right (spare rim) than the front left. I'd say about atleast a 6 inch difference tall wise (I think it more than that though). My logic to this was that the small tire would brake first causing the truck to shift to the left
![]() Quote:
![]() ![]() The idle is somewhat weird, the exhaust pulses sound different (may just be in my head though). But I do know the truck died out on me a couple of times when I would put it in reverse and once on drive. Wasn't really sputtering or anything, just slowed down and turned off. The gas is very old. Id say around 4 months without the truck being turned on at all.
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1978 stepside C10 build: http://67-72chevytrucks.com/vboard/s...d.php?t=468265 |
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#6 |
7000 #'s of american IRON
Join Date: Dec 2004
Location: north tx
Posts: 883
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Re: Truck feeling really heavy
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#7 |
Registered User
Join Date: Oct 2004
Location: Roma,TX
Posts: 774
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Re: Truck feeling really heavy
Eh, I was a little bit off. Its around 4.
I'm running on the left front a 265/50r15 and on the right a 235/70r15 I don't really drive it. I've been fixing it up slowly and got a race set up at the race track mid-to-late december. So, I took it out to see if everything was fine. I'm tired of those 15x10's and am switching to some stock rallies, I've been getting from different sources so they are all different colors. So I wanted to go get them powdercoated before I mount the tires. I'm running out of time though. I think I'm going to have to make a track appearance with black, gray, and green rims ![]()
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1978 stepside C10 build: http://67-72chevytrucks.com/vboard/s...d.php?t=468265 |
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