LT4-fuel issues
Thread Starter
4th Gear
Joined: May 2012
Posts: 4
Likes: 0
From: Lakewood Colorado
LT4-fuel issues
I have a 96 CE LT4 that tends to have a fuel delivery problem especially have a few short trips. She will run fine, I'll stop to do an errand, get back in and she will either not start but crank, or will start and then seems fuel starved and I have to keep my foot in it to keep her running or I'm stranded for at least an hour, while she sorts her self out. Wondering if this is a fuel pump issue, or if any one else has a clue. She will throw a misfire code sometimes. Very frustrating
Melting Slicks
Joined: Sep 2010
Posts: 2,422
Likes: 202
I have a 96 CE LT4 that tends to have a fuel delivery problem especially have a few short trips. She will run fine, I'll stop to do an errand, get back in and she will either not start but crank, or will start and then seems fuel starved and I have to keep my foot in it to keep her running or I'm stranded for at least an hour, while she sorts her self out. Wondering if this is a fuel pump issue, or if any one else has a clue. She will throw a misfire code sometimes. Very frustrating
you should purchase a FP pressure gauge for any modern car. For diagnostics. About $35 far less then a mechanic bill.
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
First thing to do is to listen to see if you can hear the 2 second prime when the key is turned.
A fuel pressure gauge would be a necessary tool and data point to see if fuel pressure is actually lost. You may have to drive on those short trips with the gauge taped to the windshield.
Another simple item to check is to pull off the vacuum hose for the FPR and see if there is any fuel in it. If it is leaking back into the engine it could be possibly flooded and when you "put your foot in it" to the floor it actually shuts down fuel delivery from the injectors and engine just pulls in air. This would be to clear out a flooded engine.
A fuel pressure gauge would be a necessary tool and data point to see if fuel pressure is actually lost. You may have to drive on those short trips with the gauge taped to the windshield.
Another simple item to check is to pull off the vacuum hose for the FPR and see if there is any fuel in it. If it is leaking back into the engine it could be possibly flooded and when you "put your foot in it" to the floor it actually shuts down fuel delivery from the injectors and engine just pulls in air. This would be to clear out a flooded engine.
Intermediate
Joined: Feb 2014
Posts: 32
Likes: 3
From: Pittsburgh Pa
Starting issue
When was the last time the fuel filter was changed? Many people tend to disregard the filter and it should be done with a scheduled maintenance. I know that you need to have your car in the air to access it along the frame on the passenger side. Make sure you have new O rings in place before you reassemble.
I have a 96 CE LT4 that tends to have a fuel delivery problem especially have a few short trips. She will run fine, I'll stop to do an errand, get back in and she will either not start but crank, or will start and then seems fuel starved and I have to keep my foot in it to keep her running or I'm stranded for at least an hour, while she sorts her self out. Wondering if this is a fuel pump issue, or if any one else has a clue. She will throw a misfire code sometimes. Very frustrating
