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

1995 LT1 Starting Issues

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Old Feb 24, 2016 | 08:37 PM
  #1  
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Default 1995 LT1 Starting Issues

My '95 LT1 use to start with just a bump of the starter, then suddenly started having to crank the engine for several second before starting. It's taking longer each time for the engine to start with a strong smell of raw gas when the engine does start. After a few second of rough running, the engine smooths out. It has also dropped fuel efficiency down from 18.5 MPG to 15.8 MPG after the starting issues.

If I crank the engine just after I shut it off, it will start on the first bump of the starter - if it sits for more than a few minutes then it requires a lot of cranking to start.

It's not throwing any codes.

Any ideas?

Thanks.
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Old Feb 24, 2016 | 09:00 PM
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"Strong smell of gas". Be careful with that. You don't want to burn down your car. You better find out where the smell is coming from and that will more than likely solve your cranking issue. One place to start is the fuel pressure regulator. Pull the tube off the top and sniff for the gas smell. The diaphragm will sometimes rupture and allow gas to pass through. You can also pull the tube and place a bunched up rag over the nipple. Get someone to turn the key to " on" position (not all the way to start) and see if fuel squirts into the rag. If the FPR checks out, check your fuel rail connections.
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Old Feb 25, 2016 | 02:31 AM
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When was the fuel filter last replaced?

I bought my car last November and it had issues starting. I bought a new battery and it still had issues. I then replaced the solenoid and contact plates in the starter and the car started up really well and strong most days, however sometimes it would crank for awhile and start and then sometimes it would crank and I'd have to retry it for the car to start.

I did some research on here and someone suggested changing out the fuel filter. I did that about two/three weeks ago and BAM, starts right up every time with little to no hesitation!
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Old Feb 25, 2016 | 06:45 AM
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Another vote for the fpr. Check your oil for fuel do not want a granade.

Last edited by antfarmer2; Feb 25, 2016 at 06:47 AM.
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Old Feb 25, 2016 | 08:21 AM
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From: College Station Tx
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Originally Posted by csthews
"Strong smell of gas". Be careful with that. You don't want to burn down your car. You better find out where the smell is coming from and that will more than likely solve your cranking issue. One place to start is the fuel pressure regulator. Pull the tube off the top and sniff for the gas smell. The diaphragm will sometimes rupture and allow gas to pass through. You can also pull the tube and place a bunched up rag over the nipple. Get someone to turn the key to " on" position (not all the way to start) and see if fuel squirts into the rag. If the FPR checks out, check your fuel rail connections.
The more I think of this, the more I'm leaning towards a leaking injector or injectors. The FPR check is cheap and easy, so I think you should rule that out first. If the FPR checks out ok, then you will need to go buy a fuel rail pressure test gage (I bought a cheapie at Harbor Freight). Connect the gage to the needle valve on the fuel rail. Again turn the key to "on" and then back off. The fuel pump will run for a few seconds and then shut off and, in doing so, will pressure up the system. Record the pressure, then come back in a few minutes and record the pressure again. If it drops down to near zero, then you possibly have a leaking injector. This could possibly answer why the rough running due to gas in the cylinder(s) when you crank the car.

You really don't want to try to crank the engine until you find exactly where the gas smell is coming from. Gas leaking into the cylinder can be pretty bad.
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Old Feb 26, 2016 | 10:23 AM
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Been down this road 3 times for the same symptom. Fuel in the vacuum line to the FPR and is real easy to check and obvious if it is in there. Turn the key, prime the system, wait 30 seconds or so and check the hose.

When it starts the excess fuel will just get burned up as it will run rich for a few seconds. FPR easy to replace after you de-pressurize the system.
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