C6 stange starting after intake manifold porting
10-27-2014, 06:27 PM
#1
Instructor
Thread Starter
C6 stange starting after intake manifold porting
I recently have ran into a very weird issue after installing a ported intake. First let me tell you what I have figured out so far. I installed a ported LS2 manifold and cleaned my injectors. Car has headers, CAI, and ported manifold as far as mods go no tuning has been done. The car did not have this issue before the manifold was installed.
1.Injectors pass tests and are flow matched to 3%.
2.I cant find any vacuum leaks at or near the manifold or injector holes.
3.Once started cars runs and drives great no issues.
The issue:
If I leave the car sit overnight it starts up great no problem. If I drive it then shut it off and restart immediately no problem. Now if I drive it to the store and it sets 15+ minutes it cranks several times then stumbles for a second and usually a little smoke comes out the exhaust. I thought it was leaking fuel injectors but they really don't leak on the flow bench.
Thanks in advance for any advice or suggestions.
1.Injectors pass tests and are flow matched to 3%.
2.I cant find any vacuum leaks at or near the manifold or injector holes.
3.Once started cars runs and drives great no issues.
The issue:
If I leave the car sit overnight it starts up great no problem. If I drive it then shut it off and restart immediately no problem. Now if I drive it to the store and it sets 15+ minutes it cranks several times then stumbles for a second and usually a little smoke comes out the exhaust. I thought it was leaking fuel injectors but they really don't leak on the flow bench.
Thanks in advance for any advice or suggestions.
10-27-2014, 07:30 PM
#4
Team Owner
Member Since: Jun 2005
Location: Northern, VA
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St. Jude Donor '15
"In honor of jpee"
I don't know this for a fact but Sub's suggestion seems reasonable. After awhile the cumulative mods to your car will require a tune or things can get sticky for you.
10-27-2014, 07:54 PM
#5
Melting Slicks
car shouldn't need a tune with headers and ported intake. I installed ported fast and long tubes and the car acted normal before and after the tune.
op has other issues.
op has other issues.
10-27-2014, 09:06 PM
#6
Drifting
While it is true that other issues likely exist I would suggest a dyno tune none the less - a good tuner will be able to get a great look at all kinds of settings, flow rates and parameters not normally seen - during this part of the tuning process he may discover what the issue is
Even a pure stock car can benefit from a good dyno tune
Even a pure stock car can benefit from a good dyno tune
10-28-2014, 07:42 AM
#7
6th Gear
Member Since: Sep 2010
Location: Hopkinsville Kentucky
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you may check the fuel pressure regulator. In my Chevy pickup the pressure regulator diaphragm got a small hole and gas would bypass through the vacuum line and flood the engine. pull the vacuum line and if it has gas in it the regulator is bad.
I don't know if the corvette has the same type of vacuum controlled regulator? someone else could chime in if they know.
I don't know if the corvette has the same type of vacuum controlled regulator? someone else could chime in if they know.
10-28-2014, 04:15 PM
#8
I have had the same issue for some time. Three tuners have not solved this issue. I will be following your post. Here was mine:
https://www.corvetteforum.com/forums...warmed-up.html
Do you have an 2005? All my searches had one common denominator, 2005 LS2's. Just a guess.
Jeff
https://www.corvetteforum.com/forums...warmed-up.html
Do you have an 2005? All my searches had one common denominator, 2005 LS2's. Just a guess.
Jeff
I recently have ran into a very weird issue after installing a ported intake. First let me tell you what I have figured out so far. I installed a ported LS2 manifold and cleaned my injectors. Car has headers, CAI, and ported manifold as far as mods go no tuning has been done. The car did not have this issue before the manifold was installed.
1.Injectors pass tests and are flow matched to 3%.
2.I cant find any vacuum leaks at or near the manifold or injector holes.
3.Once started cars runs and drives great no issues.
The issue:
If I leave the car sit overnight it starts up great no problem. If I drive it then shut it off and restart immediately no problem. Now if I drive it to the store and it sets 15+ minutes it cranks several times then stumbles for a second and usually a little smoke comes out the exhaust. I thought it was leaking fuel injectors but they really don't leak on the flow bench.
Thanks in advance for any advice or suggestions.
1.Injectors pass tests and are flow matched to 3%.
2.I cant find any vacuum leaks at or near the manifold or injector holes.
3.Once started cars runs and drives great no issues.
The issue:
If I leave the car sit overnight it starts up great no problem. If I drive it then shut it off and restart immediately no problem. Now if I drive it to the store and it sets 15+ minutes it cranks several times then stumbles for a second and usually a little smoke comes out the exhaust. I thought it was leaking fuel injectors but they really don't leak on the flow bench.
Thanks in advance for any advice or suggestions.
Last edited by Justasheet; 10-28-2014 at 04:19 PM.
10-28-2014, 04:44 PM
#9
Melting Slicks
imo...I don't think that the op has the same issues as you do. his can be easily remedied by reinstalling a stock intake and removing the ported one from the equation. you installed a cam so yours will be a little more involved to sort.
10-28-2014, 04:45 PM
#10
Jeff
10-28-2014, 04:45 PM
#11
Melting Slicks
I recently have ran into a very weird issue after installing a ported intake. First let me tell you what I have figured out so far. I installed a ported LS2 manifold and cleaned my injectors. Car has headers, CAI, and ported manifold as far as mods go no tuning has been done. The car did not have this issue before the manifold was installed.
1.Injectors pass tests and are flow matched to 3%.
2.I cant find any vacuum leaks at or near the manifold or injector holes.
3.Once started cars runs and drives great no issues.
The issue:
If I leave the car sit overnight it starts up great no problem. If I drive it then shut it off and restart immediately no problem. Now if I drive it to the store and it sets 15+ minutes it cranks several times then stumbles for a second and usually a little smoke comes out the exhaust. I thought it was leaking fuel injectors but they really don't leak on the flow bench.
Thanks in advance for any advice or suggestions.
1.Injectors pass tests and are flow matched to 3%.
2.I cant find any vacuum leaks at or near the manifold or injector holes.
3.Once started cars runs and drives great no issues.
The issue:
If I leave the car sit overnight it starts up great no problem. If I drive it then shut it off and restart immediately no problem. Now if I drive it to the store and it sets 15+ minutes it cranks several times then stumbles for a second and usually a little smoke comes out the exhaust. I thought it was leaking fuel injectors but they really don't leak on the flow bench.
Thanks in advance for any advice or suggestions.
10-28-2014, 04:47 PM
#12
Melting Slicks
10-28-2014, 04:47 PM
#13
Instructor
Thread Starter
10-28-2014, 05:08 PM
#14
Melting Slicks
I've read its easy to screw up if not ported correctly. do you have a stocker to try out? if not, I have one if needed but you would need to pay shipping both ways.
10-28-2014, 05:14 PM
#15
Safety Car
I recently have ran into a very weird issue after installing a ported intake. First let me tell you what I have figured out so far. I installed a ported LS2 manifold and cleaned my injectors. Car has headers, CAI, and ported manifold as far as mods go no tuning has been done. The car did not have this issue before the manifold was installed.
1.Injectors pass tests and are flow matched to 3%.
2.I cant find any vacuum leaks at or near the manifold or injector holes.
3.Once started cars runs and drives great no issues.
The issue:
If I leave the car sit overnight it starts up great no problem. If I drive it then shut it off and restart immediately no problem. Now if I drive it to the store and it sets 15+ minutes it cranks several times then stumbles for a second and usually a little smoke comes out the exhaust. I thought it was leaking fuel injectors but they really don't leak on the flow bench.
Thanks in advance for any advice or suggestions.
1.Injectors pass tests and are flow matched to 3%.
2.I cant find any vacuum leaks at or near the manifold or injector holes.
3.Once started cars runs and drives great no issues.
The issue:
If I leave the car sit overnight it starts up great no problem. If I drive it then shut it off and restart immediately no problem. Now if I drive it to the store and it sets 15+ minutes it cranks several times then stumbles for a second and usually a little smoke comes out the exhaust. I thought it was leaking fuel injectors but they really don't leak on the flow bench.
Thanks in advance for any advice or suggestions.
10-28-2014, 06:23 PM
#16
Instructor
Thread Starter
I ported it myself. Really just soothed the runners and enlarged the openings slightly. Wouldn't it run poorly if that was the case?
10-28-2014, 06:23 PM
#17
Instructor
Thread Starter