I Am Stumped
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Joined: May 2008
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I Am Stumped Heres what I got....96 Z28(bought it new)automatic, 5.7 LT-1
heres the problem...Last year, It would take a good 10 seconds of cranking to get it started. Once started it ran fine. If you shut it off for less than about 1/2 hour, and went to start it , it would fire back up right away. If it was longer than that it would take another 10 seconds of cranking.
Right before I parked it for the winter, the motor would die sometimes, but start right back up, and I was gettin some good vibration as well.I parked it for the winter, and was gonna deal with it in the spring(now)
Sooo, I go to pull it out a couple weeks ago and it cranks and cranks and wont start.So I put a new fuel pump in......still wont start..I have good fuel pressure at the rails.When trying to start it it will sometimes backfire out the exzaust or ill get a "huff" out the intake!! I love thowing money at problems.. so... I put in a new accel optispark....still wont start. Then I put in a new coil..."just incase"... still wont start. I do have spark at the plugs so I think maybe its the injectors...so for ***** and grins I have my brother crank the car while I use a little starting fluid....nothing! How is that possible?I have air..
I have spark.... And i have fuel. If it were to start with the starting fluid than I know the problem would be fuel related(injectors, etc) but I am really at a loss here......Any one have a idea?
heres the problem...Last year, It would take a good 10 seconds of cranking to get it started. Once started it ran fine. If you shut it off for less than about 1/2 hour, and went to start it , it would fire back up right away. If it was longer than that it would take another 10 seconds of cranking.
Right before I parked it for the winter, the motor would die sometimes, but start right back up, and I was gettin some good vibration as well.I parked it for the winter, and was gonna deal with it in the spring(now)
Sooo, I go to pull it out a couple weeks ago and it cranks and cranks and wont start.So I put a new fuel pump in......still wont start..I have good fuel pressure at the rails.When trying to start it it will sometimes backfire out the exzaust or ill get a "huff" out the intake!! I love thowing money at problems.. so... I put in a new accel optispark....still wont start. Then I put in a new coil..."just incase"... still wont start. I do have spark at the plugs so I think maybe its the injectors...so for ***** and grins I have my brother crank the car while I use a little starting fluid....nothing! How is that possible?I have air..
I have spark.... And i have fuel. If it were to start with the starting fluid than I know the problem would be fuel related(injectors, etc) but I am really at a loss here......Any one have a idea?
TECH Senior Member
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Joined: Oct 2006
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From: Decatur, TN (N-W of Athens)
90% of us stay clear of Accel and there's been cases of DOA Optis with them. Pull the easiest plug and ground it on some metal, and crank, see if there's any spark.
COULD be the ICM mounted on the head.
COULD be the ICM mounted on the head.
Crank sensor only refrences missfires for OBD2 diagnostics.It controls nothing.Get it on a scan tool and read some of the sensors then report back.I.e coolant temp.maf.iat.O2s.
What plugs/gap and wires you running.
What plugs/gap and wires you running.
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TECH Apprentice
Joined: Jun 2007
Posts: 313
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it might have been the opti. your opti is keyed on the backside. when you installed the new one did you make sure it went on right? the opti should sit flush BEFORE you put a screw in it. if you had to put screws in it to flush it up then its on wrong.