Problem Starting new motor...
08-28-2005, 07:39 AM
#1
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Problem Starting new motor... OK I've not been on the board in quite some time, so some of you might not know I grenaded my LS1 motor At VIR back in June. Put a hole in it that is HUGE. Go here to see the pics of the damage... http://photos.yahoo.com/dat74z and click on the Corvette pics folder.
Anyway, I was in the middle of having a new LS1 built anyway, so it wasn't that big a deal at the time. I now have installed a new LS1 with ported heads (2.02/1.57 valves) and thunder cam (224/224 kit) in it with a forged bottom end on all new parts...Running a Z06 intake with 28# injectors and Jeff Creech did the tune on the PCM for me. Also running a set of LGM headers. Only thing is now I can't get the motor to fire... getting a lot of popping and cracking when I crank it over...
I don't currently have the 1998 valve cover brackets that hold the coil packs on, AND I am re-using the cam and crank sensors from the motor that grenaded... What's the chances that one of these issues is the culprit? I'm going to retrace the wiring again, but I'm looking for pointers here guys... This is absolutely an ignition/ timing related issue...
Mike
Anyway, I was in the middle of having a new LS1 built anyway, so it wasn't that big a deal at the time. I now have installed a new LS1 with ported heads (2.02/1.57 valves) and thunder cam (224/224 kit) in it with a forged bottom end on all new parts...Running a Z06 intake with 28# injectors and Jeff Creech did the tune on the PCM for me. Also running a set of LGM headers. Only thing is now I can't get the motor to fire... getting a lot of popping and cracking when I crank it over...
I don't currently have the 1998 valve cover brackets that hold the coil packs on, AND I am re-using the cam and crank sensors from the motor that grenaded... What's the chances that one of these issues is the culprit? I'm going to retrace the wiring again, but I'm looking for pointers here guys... This is absolutely an ignition/ timing related issue...
Mike
08-30-2005, 05:11 PM
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We did a compression check and the numbers were all 178 across the board... I think (And this is real dumb, I know!) that the coils were pointed the wrong direction... 
My original configuration was a 99C5 and the heads we had ported and worked on were 98 models... I wasn't aware that the brackets didn't work, then we (17 year old step son helping 
) flipped the coil packs around and I think had one bank firing out of sequence... 
Anyway, I'm hoping to have it firing tomorrow. Ordered the crank and cam sensors from rockauto.com on Sunday/ two day delivery... Here is is Tuesday... No sensors... I'm running out of things to button up!
Mike
My original configuration was a 99C5 and the heads we had ported and worked on were 98 models... I wasn't aware that the brackets didn't work, then we (17 year old step son helping ) flipped the coil packs around and I think had one bank firing out of sequence... Anyway, I'm hoping to have it firing tomorrow. Ordered the crank and cam sensors from rockauto.com on Sunday/ two day delivery... Here is is Tuesday... No sensors... I'm running out of things to button up!
Mike
08-31-2005, 05:05 AM
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No. The coils were flipped around on the valve covers and therefore lined up to the wrong plug wires. Effectively, the car was out of time because the wrong coil was firing the wrong plug at the wrong time.
Mike
Mike
