C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

"Someone throw me a freaking bone here"

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Old 03-10-2010, 12:28 AM
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superc4
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Default "Someone throw me a freaking bone here"

I have a 1990 corvette l98, that runs fine.... the first time you start it of the day.

If you start this thing for more than two minutes, it gets no fuel to the motor for 2 hours. What do you guys think?
Old 03-10-2010, 12:36 AM
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jfb
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First, what you wrote makes not a bit of sense. Trying very hard to interpret what you mean, I guess that if you start and idle the car for two minutes and shut the engine off, it won't start again until you wait for two hours. When any engine won't start, that is the time to start doing some testing to find out why. Engines need spark, spark at the right time, fuel and air and in the correct ratio, and finally, compression in order to start and run. Use a timing light to find out if you have spark and spark at the right time. Use a fuel pressure gauge to find out if you have fuel pressure and if it holds up for a long time when the ignition is turned off. Use a noid light to see if the injectors are being pulsed. Use a compression gauge to see if you have compression. All of these recommendations can be found on page 1 of any auto repair manual.
Old 03-11-2010, 08:45 PM
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Powersmokin
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Try putting the peddle to the floor and see if it will start when that happens if so you have bad injectors.
Old 03-11-2010, 09:00 PM
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BrianCunningham
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did you pull the codes yet?
Old 03-12-2010, 08:15 AM
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Vette73
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Originally Posted by Powersmokin
... you have bad injectors.


Originally Posted by BrianCunningham
did you pull the codes yet?
Injectors won't set a code.

Time for the old DVM (ohm) injector test. Do a CFC4 search. Good luck.
Old 03-12-2010, 10:55 AM
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TJM
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Originally Posted by superc4
I have a 1990 corvette l98, that runs fine.... the first time you start it of the day.

If you start this thing for more than two minutes, it gets no fuel to the motor for 2 hours. What do you guys think?


Not a lot to work with here, but I would start with a fuel pressure gauge.

Connect it and see what the pressures are, because it sounds as if it is a bad regulator to me? Or could be the return pipe control?

Either way the gauge will tell you what's up with fuel.

41Lbs should show up if everything is fine. .



TJM.
Old 03-12-2010, 07:02 PM
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BrianCunningham
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Originally Posted by Vette73

Injectors won't set a code.
right,
but you want to rule out other stuff, and see what's set.
Old 03-12-2010, 07:50 PM
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Sparkostatic
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Don't think it could be as simple as a fuel filter?
Old 03-13-2010, 01:56 PM
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JAKE
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How about re-writing your original post to include more specifics and details on what's going on. Otherwise we're just guessing at what's causing your condition.

In addition to what jfb already posted, we need to come up with a logical trouble-shooting procedure in order to get to the bottom of this.

Jake
Old 03-13-2010, 02:29 PM
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j-wireman
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Originally Posted by superc4
... the first time you start it of the day.
WTF does this mean???

Use the paper clip method to access the codes. They will show in the center of the instrument cluster.

For What It's Worth:
I once had a Chevy whose fuel line hose would collapse when it warmed up. I found it by accident and actually saw it happen.

Mike
'90 'vert
Old 03-13-2010, 04:22 PM
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Sparkostatic
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Originally Posted by JAKE
How about re-writing your original post to include more specifics and details on what's going on. Otherwise we're just guessing at what's causing your condition.

In addition to what jfb already posted, we need to come up with a logical trouble-shooting procedure in order to get to the bottom of this.

Jake
I 100% agree!!!
Old 03-13-2010, 04:30 PM
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engle1147
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Ummmm.........ICM cools (2 hours or overnight)....once cooled the module can get the signal to the ECM to trigger the injector circuits.

Old 03-13-2010, 10:57 PM
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l98tpi
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Default Here's a bone

It was ran low on fuel and the fuel pump is heat stressed. The fuel can no longer keep it cool enough to function. After it starts running for a couple of minutes it overheats and shuts down. If that isn't it, you'll have to try additional troubleshooting measures. Good luck.

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