Maiden Voyage -> Yes, some issues...
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TECH Enthusiast
Joined: Sep 2005
Posts: 618
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Maiden Voyage -> Yes, some issues... I got the LS1 in the '56, and drove it about 75 feet onto a trailer to send out to have the interior done. I decided to brave it and drive it home...about 80 miles.
At low speeds it seems to do fine, but when I get on the freeway it acts like it is running out of gas.
Sumptoms are:
I wondered about the fuel tank needing to be vented, but I had called someone (I think Rock Valley, but not sure now) and they said the original style gas cap for the '56 Chevy was fine w/o venting.
Where should I start?
Anyone have any suggestions?
At low speeds it seems to do fine, but when I get on the freeway it acts like it is running out of gas.
Sumptoms are:
- Max Speed is about 55, unless I accellerate good, just to get faster...until I 'run out of gas'
- Driveing along at slower speed, say 35, I can accellerate, but it seems to run out of gas
- As I cruise at about 55, it may surge now and then
- If I drive on the freeway with the pedal held to the floor, it will cruise along at about 55, sometimes it starts slowing down, makeing me feel like it's done. Then will pick back up.
- 2004 zero mile LS1 Corvette 350 engine, 4L60e
- Rock Valley Gas Tank and Pump
- 3/8 Fuel line feed, 5/16 return. No kinks in line (stainless hose from tank to line coming up frame, to stainless line going up to engine)
- The air to the TB is supplied through a 4" tube: 90 degree off of TB, across behind radiator support, 90 degree out the right side, with S&P MAF/Air Cleaner for cold air intake
- Computer programmed by Wait4Me. I asked for mileage type tuning as opposed to performance.
I wondered about the fuel tank needing to be vented, but I had called someone (I think Rock Valley, but not sure now) and they said the original style gas cap for the '56 Chevy was fine w/o venting.
Where should I start?
Anyone have any suggestions?
On The Tree
Joined: Jul 2004
Posts: 166
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From: Stockholm, Sweden
Do you have any device for logging the computer, that will give a hint.
The oldstyle cascaps have "built-in" venting of the tank.
But it sounds like a fuelproblem, have you checked the pressure at the rails?
Jan
The oldstyle cascaps have "built-in" venting of the tank.
But it sounds like a fuelproblem, have you checked the pressure at the rails?
Jan
Thread Starter
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Joined: Sep 2005
Posts: 618
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I do have access to a device to read codes on the computer, but I have to borrow that. It's just a code reader. Do you think that would provide info needed?
I was thinking while driving it home I may have to spring for the expensive tuning software.
So far, I haven't tried anything. Checking pressure at the rails sounds like a good idea, although I'm not sure how I will accomplish that. I'll have to give it some thought. I have an inline fuel pressure guage. Woudl someone do that by connecting somethign to the end of the reils, where the schraeder valve is?
I too think it sounds like fuel problem.
I was thinking while driving it home I may have to spring for the expensive tuning software.
So far, I haven't tried anything. Checking pressure at the rails sounds like a good idea, although I'm not sure how I will accomplish that. I'll have to give it some thought. I have an inline fuel pressure guage. Woudl someone do that by connecting somethign to the end of the reils, where the schraeder valve is?
I too think it sounds like fuel problem.
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TECH Apprentice
Joined: Jan 2006
Posts: 369
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From: Phoenix, AZ
Originally Posted by 67RSCamaroVette
sounds like limp mode. check the fuel pressure first, then scan it to see if there are any obvious codes.
do it the other way around, code scanning is way easier than pressure checking
just roll into an autozone and have them pull codes (if you have a dataport hooked up)
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Verdad Gallardo Thread Starter
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Thanks guys.
I am in Lawrence, KS.
Re: teh O2 Sensor: would one bad cause that? I know that I dropped one while it was out, and I read that could cause problems. I almost replaced it, then found how expensive it was, and decided to wait and see what happens. Would the code indicate which one is bad if that is the case?
Also, something else I forgot to mention: This is electronic TB. I presume it would either work, or not work. When I first started it, the throttle wouldn't respond. I had to spray some electronic contact cleaner in the connection at the pedal.
I'll see if I can get a code read on it.
I am in Lawrence, KS.
Re: teh O2 Sensor: would one bad cause that? I know that I dropped one while it was out, and I read that could cause problems. I almost replaced it, then found how expensive it was, and decided to wait and see what happens. Would the code indicate which one is bad if that is the case?
Also, something else I forgot to mention: This is electronic TB. I presume it would either work, or not work. When I first started it, the throttle wouldn't respond. I had to spray some electronic contact cleaner in the connection at the pedal.
I'll see if I can get a code read on it.
if your only useing a code checker and the engine light is NOT on it will just say no codes found, so i would think not an o2 problem. definetly check your fuel presure first. you may think you have it all covered (fuel wise) but unless you check it, you can't cross it off your list....
On The Tree
Joined: Jan 2006
Posts: 172
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From: Quakertown, PA
I would double check the throttle body first. Turn the key on, and have someone press the pedal while you watch the throttle blade. Make sure it is responding properly.
As for checking fuel pressure, you can pick up a pressure gauge that screws right onto the schraeder valve.
To check the gas cap, leave it off and take the car for a drive. If the problem goes away, then you need a vented cap.
As for checking fuel pressure, you can pick up a pressure gauge that screws right onto the schraeder valve.
To check the gas cap, leave it off and take the car for a drive. If the problem goes away, then you need a vented cap.