Rebuilt engine, won't start.
#1
Staging Lane
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Location: Sanford,ME
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Rebuilt engine, won't start.
I just reinstalled the engine in my 96, it turns over but won't start. It has spark to the plugs, has 43 lbs. fuel pressure. I took a lot of care to make sure I reinstalled the opti correctly. When it's turning over it will backfire from the exhaust and the intake which seems like a timing problem. Plug wires are all in the correct order. I haven't touched the opti. It ran good before, I just took it off and put it back on. Any ideas ? I'm hoping I'm missing something simple.
#4
Staging Lane
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I don't think the valves are too tight but it's easy enough to back them off before I tear into the opti. I'm afraid I must have messed up installing the opti.
#5
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Join Date: Nov 2013
Location: N. Berwick, Maine
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What if the water pump is out of the car and the ECT sensor is not connected? Would this would cause the PCM to read -40 for coolant temp by an open circuit correct? If thats the case then it would be dumping too much fuel and preventing the engine from firing?
#6
it is possible you didn't get the cam dowel in the right Opti position.
Did the opti push on easily and was it completely flush with the block before you put the 3 bolts that hold it on?
backfire at random does often mean a opti issue not being positioned right
with that said incorrect valve lash also as noted
Did the opti push on easily and was it completely flush with the block before you put the 3 bolts that hold it on?
backfire at random does often mean a opti issue not being positioned right
with that said incorrect valve lash also as noted
#7
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it is possible you didn't get the cam dowel in the right Opti position.
Did the opti push on easily and was it completely flush with the block before you put the 3 bolts that hold it on?
backfire at random does often mean a opti issue not being positioned right
with that said incorrect valve lash also as noted
Did the opti push on easily and was it completely flush with the block before you put the 3 bolts that hold it on?
backfire at random does often mean a opti issue not being positioned right
with that said incorrect valve lash also as noted
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#8
TECH Addict
Did you do any mods while you were rebuilding it? Did you adjust the tune for the mods? It still shouldn't backfire though.
#9
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During the install we replaced the stock cam with the Lt4 hotcam. We have a reprogrammed computer but havent yet installed it, we figured we could atleast verify that the engine runs. It ran on the old computer fine so we figured it would atleast fire on the old one.