Roomie's LT1 Fiasco - What's Wrong?
07-29-2011, 03:19 PM
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Roomie's LT1 Fiasco - What's Wrong? So my room mate Porter finally has his motor in his '93 Z28. Here is a brief breakdown of the car:
He purchased a '93 Z28 auto with a destroyed bottom end. He pulled the motor, and ended up buying an engine and trans out of a '96 Impala from some old guy in Detroit (Ugh... bad idea). Porter pulled all the accessories and wiring harness from his '93 and put them on the '96 LT1 (he left the Impala heads on the '96 motor, and put his '93 intake on it). He was told when he bought the motor, it was running prior with no issues with 107K on it. (PERSONALLY, I would have never purchased an iron-headed LT1 motor and tried dropping it in this car, but that's me). All necessary harnesses are plugged in.
So on Sunday, he tried to start it. 1 or 2 cylinders fired, that is all. We cannot get it started. The car sat for an unknown amount of time, and who knows how much water could have been in the gas tank. He went and put two gallons of fresh gas in it, but I'm sure that wouldn't really help if it's been sitting. I recommended checking the fuel pressure.
So do you guys have any idea what the problem could be? He swears that all the plug wires are on correctly. Throw me some ideas, because I need this car running and out of my driveway.
He purchased a '93 Z28 auto with a destroyed bottom end. He pulled the motor, and ended up buying an engine and trans out of a '96 Impala from some old guy in Detroit (Ugh... bad idea). Porter pulled all the accessories and wiring harness from his '93 and put them on the '96 LT1 (he left the Impala heads on the '96 motor, and put his '93 intake on it). He was told when he bought the motor, it was running prior with no issues with 107K on it. (PERSONALLY, I would have never purchased an iron-headed LT1 motor and tried dropping it in this car, but that's me). All necessary harnesses are plugged in.
So on Sunday, he tried to start it. 1 or 2 cylinders fired, that is all. We cannot get it started. The car sat for an unknown amount of time, and who knows how much water could have been in the gas tank. He went and put two gallons of fresh gas in it, but I'm sure that wouldn't really help if it's been sitting. I recommended checking the fuel pressure.
So do you guys have any idea what the problem could be? He swears that all the plug wires are on correctly. Throw me some ideas, because I need this car running and out of my driveway.
07-29-2011, 03:35 PM
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Could it be an opti issue? He put the opti back on from his '93 (which I noticed was a later-style vented opti).
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07-29-2011, 05:10 PM
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It was posted that the old opti was a vented style that was put on. If the new engine is a 96 trying to put an unvented opti would be obvious that it wouldn't work due to spline drive. The vented opti should use the longer cam pin so I highly doubt the cam pin length would be an issue. Again, check fuel and and injectors. Just went through this with my kids Engine. Engine sat, injectors varnished up but no go. Pulled them, soaked them and fired right up.
Last edited by Jpack; 07-29-2011 at 05:27 PM.
07-29-2011, 05:32 PM
#12
Yep there will be no issues using the 93 harness with the 96 motor. The only thing there is once it is running if the 93 was using a knock sensor the resistances are different OBD I to OBD II, so if he still has the old motor I would swap knock sensors. So might have a knock sensor code once running.
Might seem like a weird question, if he left the impala heads on I take it the rockers weren't off? I'm just thinking back to the only time in my life a motor did not fire off, and that is the first time I ever messed with rockers.
Might seem like a weird question, if he left the impala heads on I take it the rockers weren't off? I'm just thinking back to the only time in my life a motor did not fire off, and that is the first time I ever messed with rockers.
07-29-2011, 05:32 PM
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07-29-2011, 06:55 PM
#14
Run up to autozone and get this, worked Like a champ and make sure not to get any on your hands or near flames. Serious stuff. This in a glass jar with my kids injectors turned it brown in an hr and I threw them in the car and it fired right up.
07-29-2011, 08:18 PM
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Yea well that stil makes no sense .. Just because the cap is vented doesn't change the fact that a 93 opti is a shaft spline drive... Not capable of meshing/ mating and sealing on a 96 timing cover or it's cam gear.. So...?
07-29-2011, 08:38 PM
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A 93's timing cover and all of the opti stuff could be switch over but the dowl pin would have to be swapped also. By opti stuff I mean timing set and other components required.