New Members Welcome

[Corvsport.com Administrator]

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Thanks again for visiting the message boards and we look forward to hearing from you!

[buzi1213]

I own a 1999 FRC Corvette. Constant problem with speedometer not working. Dealer attempted to replace speedo console. No results. Tried a replacement BCM. At least they told me they tried, but again no results. A younger mechanic research and found a computer in the right front wheel well. After cleaning all contacts the speedo worked find. At least it did for three weeks. It now does not work again. In addition the check engine light goes on and off from time to time. . When it goes on the engine stalls at low speed. Any ideas from anyone. Thanks

[rmcorvette14]

Hey my name is Ryan and I'm 29 from Taylorsville, KY. I don't currently own a Corvette, but my dad has a 1993 Black Rose in wonderful shape! I visit the NCM regularly and am very knowledgeable and passionate about the Corvette and the Corvette lifestyle. More than and above all I am a follower and saved believer in Jesus Christ! Look forward to contributing on here often!

[knapper]

My name is Chuck. C-5 5.7L 2004 Vette. Driving at 70mph and a slight vibration occurs, followed in a couple minutes by vehicle shaking badly as I downshift from 6-5-4 and slow speed to 40mph. Car losing power, engine running, no check engine lights come on. Towed in. Dealership computer shows nothing. They tell me air filter extremely plugged, left side CAT is bad. Fuel line so hot they can't touch it. I pick up the car and get 60 miles down the road and the same exact flutter, followed by shaking occurs and I'm again AAA'd back to the dealership. Still no bad codes showing up on their computer. Now 24 days after I brought this car into the dealership, they say it's 2 oxygen sensors that have been replaced. I'm crossing my fingers that "this time" they've got it right but I won't know until later this evening.

[Corvsport.com Administrator]

Hello Chuck. First, thanks for joining these message board forums. We're happy to have you.

I am sorry to hear about your current situation. Based on the information you provided, I would agree with the dealership that you have an emissions/fuel issue. I assume that, by now, you've had the O2 sensors replaced? Did it help your situation at all? I would encourage you to check the fuel rail pressure, have the fuel injectors cleaned, and just generally try to remove any carbon from the fuel system. There are a number of methods for accomplishing this, but it will require some work on your part.

Where is the fuel line getting hot? Is it running close to another system in the car? Fuel lines should not get hot unless there is something heating the fluid (gas) in your car. Since fuel flows from the tank to the engine, it would make me tend to think that, if the fuel was getting hot, it could be the result of a defect of some kind in the fuel pump. If the fuel line is getting hot because its located near exhaust, transmission, or other source of heat, you might want (at a minimum) to look to see if any shielding has come loose...heating the fuel lines isn't necessarily dangerous, unless the fuel is getting so hot that you run the risk of a detonation issue. However, knowing the fuel lines is getting hot to the touch makes me think that there is something serious going on with the fuel delivery system...I'd be looking there too.

Please drop us a line and let us know if you've made any progress on this situation. I truly hope we hear from you!

[knapper]

Oct 27, 2014 22:24:29 GMT -6 Corvsport.com Administrator said:

Hello Chuck. First, thanks for joining these message board forums. We're happy to have you.

I am sorry to hear about your current situation. Based on the information you provided, I would agree with the dealership that you have an emissions/fuel issue. I assume that, by now, you've had the O2 sensors replaced? Did it help your situation at all? I would encourage you to check the fuel rail pressure, have the fuel injectors cleaned, and just generally try to remove any carbon from the fuel system. There are a number of methods for accomplishing this, but it will require some work on your part.

Where is the fuel line getting hot? Is it running close to another system in the car? Fuel lines should not get hot unless there is something heating the fluid (gas) in your car. Since fuel flows from the tank to the engine, it would make me tend to think that, if the fuel was getting hot, it could be the result of a defect of some kind in the fuel pump. If the fuel line is getting hot because its located near exhaust, transmission, or other source of heat, you might want (at a minimum) to look to see if any shielding has come loose...heating the fuel lines isn't necessarily dangerous, unless the fuel is getting so hot that you run the risk of a detonation issue. However, knowing the fuel lines is getting hot to the touch makes me think that there is something serious going on with the fuel delivery system...I'd be looking there too.

Please drop us a line and let us know if you've made any progress on this situation. I truly hope we hear from you!

[knapper]

The dealership replaced two O2 sensors and drove the car about 30 miles and let it idol for about an hour. They told me the car should be good to go. I asked them to drive the vehicle to Springfield (90 miles) and I'd drive about the same distance from the other direction and we'd meet and I'd give them the loner car and I'd take over the Vette. 40 miles into their trip to Springfield, the same exact symptoms occurred and they shut the car down and had it towed back to Clinton, MO. So no change in the performance of the car. New CAT, 2 new O2's, no change. Now their thinking fuel pump and they want to replace it. As for the fuel line getting hot, if it runs along side the CAT which had a left side temp of over 1,000 degrees perhaps that's the issue. My wife told me while she was riding in the passengers seat in September the center area where she often rests her left leg was so hot she couldn't rest her leg on that sides carpet. And starting off the first question I have is can an very dirty K & N air filter that wasn't changed for years, cause a CAT to have a melt down? I've got pictures I'd love to send you if you had an e mail I could send them to. Thanks for your help.

[Corvsport.com Administrator]

Hello Again Knapper,

Don't know if you saw my other response under the C5 Section of the forum, but I am posting it here for you to reference as well. It went into a lot greater detail about potential troubleshooting issues...some of which sound like the same things you're looking into.

Before I re-post my earlier response however, you can feel free to email me at [e-mail] or [e-mail] (I check both somewhat regularly). If you want to send pics, I will certainly give them a look.

Okay, this is my other response from late last month:
Hello knapper...I just replied to your earlier post under the New Members section...but let me respond here as well.

First, you mentioned in your other post that the fuel line was getting so hot that you couldn't touch it. At what point along the length of the car does it get this hot? Is it the entire fuel line? Is it just in a specific area?

Here's where I'd be looking. When fuel gets hot, it can expand and form a "vapor lock" where the liquid fuel literally heats to a gas state. Although this is somewhat less common in newer vehicles, it does happen...and the symptoms you are describing sound like a classic case of a vapor lock scenario.

Vapor lock occurs when the gas in a fuel line turns from liquid to vapor, before it reaches the engine. The first signs of vapor lock are normally when your engine begins to run roughly. The engine may sputter and hesitate. It will then stall completely and refuse to restart. It may seem like the car is out of gas or the fuel pump has failed. While these are possibilities, vapor lock may be the problem.

Fuel will turn to vapor in conditions of high heat and low pressure. If the fuel line to the engine becomes hot, the fuel inside the line becomes hot. Liquid fuel turns into vapor or gas. The fuel pump is not able to move the vaporized fuel and the engine will stall. As long as the vapor remains, it locks out the fuel flow. This is why your engine will not restart until it has cooled down. The problem occurs more often in carbureted engines, especially those with mechanical fuel pumps. These systems create a vacuum that pulls fuel. If the fuel vaporizes, the vacuum will not work.

Vapor lock is not a common problem with fuel-injected engines. Fuel injection systems are normally pressurized, and this pressure helps move the fuel in the system. In addition, mechanical fuels pumps in carbureted engines were often located near the engine, exposing the pump to extra heat. Electric fuel pumps are normally located in or near the gas tank. This location helps the pump and lines avoid overheating.

When a "vapor lock" situation occurs in fuel injected engines, its more than likely a failing fuel pump. If the pump is having issues, it could also be generating heat, which in theory could be heating your gasoline, causing the rise in temperature throughout the fuel lines.

I would definitely check for fuel pressure along the fuel rail. Any mechanic qualified to work on a Corvette should be more than capable of testing this for you, and I would strongly encourage you to contact your dealership and ask them to inspect the fuel pressure.

Also, I would have the entire fuel system cleaned - as well as your intake system. Get any carbon build up in your air-intake system cleaned out, and make sure that the injectors are clean.

Please follow up with us as we'd love to know how this turns out for you. I know how frustrating a car problem like this can be, but trust me, there is an explanation.


Read more: corvsport.proboards.com/thread/39/corvette-2004-commemorative-edition#ixzz3Ic9etX5a

[jammartinez760]

hi nice to meet you