Cranks No Start
01-09-2011, 06:56 PM
#1
Cranks No Start Hey Guys my car will crank but not start,
Occasionally It tries to run and will chugging and pop at like 2 or 300 hundred rpm for a few seconds then die.
Vehicle died at about 4K rpm in 1st gear and would start back up.
It is a stock longblock LT1.
Has a 306 cam
10308 Crane Spring Kit
1.6 CC Pro Mags
Ls7 Lifters
Gm guide plates
TFS pushrods
New GM Opti
Cloyes Double roller timing chain
Trifecta Performance Tune
All that was done about 20K ago.
Did a tune up last week.
New TR55s gapped at .045
Summitracing Plug wires
Car ran great all week and was running reall good this morning. I go to leave work and boom she dies.
Has 43 psi of fuel pressure
maintains Fuel Pressure while cranking
Has RPM signal
No DTCs
Has spark at the #3 Spark Plug
Doesnt seem to be making any weird noises while cranking over
Has about 20 psi of oil pressure while cranking
Oil has no flakes or sparkles in it and does not smell like fuel
What should I check next Im lost.
Any Ideas?
Occasionally It tries to run and will chugging and pop at like 2 or 300 hundred rpm for a few seconds then die.
Vehicle died at about 4K rpm in 1st gear and would start back up.
It is a stock longblock LT1.
Has a 306 cam
10308 Crane Spring Kit
1.6 CC Pro Mags
Ls7 Lifters
Gm guide plates
TFS pushrods
New GM Opti
Cloyes Double roller timing chain
Trifecta Performance Tune
All that was done about 20K ago.
Did a tune up last week.
New TR55s gapped at .045
Summitracing Plug wires
Car ran great all week and was running reall good this morning. I go to leave work and boom she dies.
Has 43 psi of fuel pressure
maintains Fuel Pressure while cranking
Has RPM signal
No DTCs
Has spark at the #3 Spark Plug
Doesnt seem to be making any weird noises while cranking over
Has about 20 psi of oil pressure while cranking
Oil has no flakes or sparkles in it and does not smell like fuel
What should I check next Im lost.
Any Ideas?
01-09-2011, 09:01 PM
#3
It cranks over normally
Anyon have any Ideas? I know it has pressure at the rail but Im not 100 percent sure if the fuel is making it to the cylinder, so Ill check Injector pulse tommorrow.
If Im getting injector pulse how do I verify that the injectors are actually switching, once I know they are getting signal?
I know Im getting spark at least at cylinder 3, Is it possible that the opti could be bad and although its sending spark, that its sending spark at the wrong time?
Anyon have any Ideas? I know it has pressure at the rail but Im not 100 percent sure if the fuel is making it to the cylinder, so Ill check Injector pulse tommorrow.
If Im getting injector pulse how do I verify that the injectors are actually switching, once I know they are getting signal?
I know Im getting spark at least at cylinder 3, Is it possible that the opti could be bad and although its sending spark, that its sending spark at the wrong time?
01-09-2011, 09:26 PM
#4
Launching!
Join Date: Aug 2010
Location: Columbus, Ohio
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Could be injectors, definately post what you find
If the opti is new like the original post says it should be fine. But if everything else checks out I would go back to it. Hope you get your problem figured out
If the opti is new like the original post says it should be fine. But if everything else checks out I would go back to it. Hope you get your problem figured out
01-09-2011, 11:15 PM
#7
Injectors are easy to pull to see if they're pulsing. Their driven off the PCM which gets it's signal from the opti.
I doubt the opti or PCM is at fault as your getting an rpm signal. I'd definitely get the icm and coil tested. You may be getting spark but not at the correct time or intensity.
I doubt the opti or PCM is at fault as your getting an rpm signal. I'd definitely get the icm and coil tested. You may be getting spark but not at the correct time or intensity.
