I have a 1995 LT1 corvette.

The car ran perfect before adding a few mods.
I added an EWP cam rockers and all the sister mods to the cam such as springs and pushrods and an MSD optispark.

The car fired right up after all the mods and idled great for about 10 mins.
It lightly hesistated once and shut off, since then the car wouldnt start again.

I removed the EWP , replaced the old taylor wires with new taylor wires and even replaced the msd cap and rotor with a brand new one even though mine is brand new, but just incase I just wanted to make sure it wasnt that because its been mentioned here they could be bad or cracked.

The odd thing is, when I remove the water pump from the motor, the car fires right up and idles and runs perfect.As soon as I bolt the water pump back on the motor, the car wont start!!

I am at a total loss here, any help would be greatly appreciated..

Thanks in advance.

 

How did you wire in your water pump? You should be powering it with a relay with B+ to the WP, and then use some switched 12V to turn on the relay. It sure seems like your WP wiring is bad somehow, and you can retest it without bolting it on there.

 

Thanks for the quick reply.

Its wired with a relay, I followed a write up on a vette forum for the exact wire colors to tap in to.

I thought maybe it could be the wiring aswell, so I unplug the waterpump completely and any associated wires but it still wont start.

I was told my cap/wires my be arcing off the waterpump, but i replaced that and im still having the same issue.

I have been working on cars for over 20 years, but this has me totally stumped.

 

First when you say won't start are you saying cranks but doesn't fire up or won't even crank?

What about with the wires to the pump disconnected but the WP still on the engine, still won't?

Any wires being pinched by the WP?