Won't run for more than 7 seconds
Thread Starter
Cruising
Joined: May 2013
Posts: 11
Likes: 0
From: LA
Won't run for more than 7 seconds
So, got a heavily modded C4 for a good price. Problem is it doesn't run. Well, not for long. I know this problem can be a thousand different things but I was wondering if y'all cool cats might have some ideas to throw at me.
Here's a video of me starting it today:
PS I'm bringing it in to a trusted high performance mechanic next week, but I figured I might get some ideas in the meantime.
1994 Corvette C4
-Engine Upgrades-
Here's a video of me starting it today:
PS I'm bringing it in to a trusted high performance mechanic next week, but I figured I might get some ideas in the meantime.
1994 Corvette C4
-Engine Upgrades-
- 396 Stroker
- Engine Bored 30 Over
- 80mm Mass Air
- Staggered Roller Rockers 1.5 Intake and 1.6 on Exhaust
- Ported Edlebrock Performance Heads
- Heads Shaved 15 Thousands of an inch
- Edlebrock LT4 Intake
- 49lb Injectors
- 58mm Twin Throttle Body
Safety Car
Joined: Apr 2005
Posts: 3,624
Likes: 431
From: Dale City VA
Something else you may want to check out.
If the car has had the dash apart - for like heater core replacement.... There are 2 big cannon plugs under the passenger side dash that can be mixed up when putting it back together.... The car will start and run for a few seconds and then die.
Had this problem on a friends 96 when a heater core was put in it.... took forever to figure out what the heck happened. Luckily a very smart GM tech over on YB knew right off what had happened and let me know.
Will
If the car has had the dash apart - for like heater core replacement.... There are 2 big cannon plugs under the passenger side dash that can be mixed up when putting it back together.... The car will start and run for a few seconds and then die.
Had this problem on a friends 96 when a heater core was put in it.... took forever to figure out what the heck happened. Luckily a very smart GM tech over on YB knew right off what had happened and let me know.
Will
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 207
From: Orlando FL
My first impression.It's not VATS because;
1 - It cranks.
2 - The security light is not on steady.
I would check for fuel pressure with a gauge.
After it quits, check for spark.
After it quits, check for injector pulses with a noid light.
I would check for codes in module 4 and I will tell you why. I'm not looking for a code. I want to see if the CCM can communicate with the PCM. Because if it does not, then FEDS will not work hence the injectors no drive. It's just something else to check, a point of information.
Racer
Joined: Oct 2006
Posts: 438
Likes: 14
From: Tucson/Santa Paula AZ/CA
2017 C4 of Year Finalist
So, got a heavily modded C4 for a good price. Problem is it doesn't run. Well, not for long. I know this problem can be a thousand different things but I was wondering if y'all cool cats might have some ideas to throw at me.
Here's a video of me starting it today: http://youtu.be/I3m-R6gyPAs
PS I'm bringing it in to a trusted high performance mechanic next week, but I figured I might get some ideas in the meantime.
1994 Corvette C4
-Engine Upgrades-
Here's a video of me starting it today: http://youtu.be/I3m-R6gyPAs
PS I'm bringing it in to a trusted high performance mechanic next week, but I figured I might get some ideas in the meantime.
1994 Corvette C4
-Engine Upgrades-
- 396 Stroker
- Engine Bored 30 Over
- 80mm Mass Air
- Staggered Roller Rockers 1.5 Intake and 1.6 on Exhaust
- Ported Edlebrock Performance Heads
- Heads Shaved 15 Thousands of an inch
- Edlebrock LT4 Intake
- 49lb Injectors
- 58mm Twin Throttle Body
HTH,
Mick
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
oil pressure switch is a backup only in case FP relay fails. relay is not supposed to drop out. for the pump not to run after priming the rails, both the relay and the ops would have to fail.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
