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Originally Posted by ModMech
Your mechanic is telling you stories. There is NO WAY he "took the whole engine to a machine shop", and did the job for $1000, or even $2000. Man it is a LOT of work to pull an engine from a van.
The bolts used in your engine are SINGLE USE, and you MUST use only the factory bolt. My guess is that someone replaced the front main seal, and re-used the bolt (or did not torque it properly) and it broke. The reason it ran poorly was the crank trigger wheel is clamped between the crank and the harmonic balancer (pulley) by that bolt. When it breaks, the trigger wheel slips, and the computer does not get correct information.
The new bolt was either not torqued properly, or the crank threads cannot hold any longer.
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Thanks for the reply again, it cost $600 to pull the engine and $250 to drill the bolt out of the crankshaft in the machine shop and some more $ to buy other things like a harmonic balancer etc. I believe i would have been better off if i had just changed the crankshaft, because it looks like there is something wrong with it. Now i am going to spend about the same thing to replace the crankshaft. Can someone tell me if this is a good idea. Thanks to all.