buick century won't fire

[eric1961]

My friend has a 1987 Century. It originally came with a six cylinder and now has a 2.5 four cylinder. He just bought it used and has had troubles since. It first was overheating then after removing thermostat seemed better then it did'nt. We changed the radiator cap, washed the radiator fins , flushed the radiator an block to no avail. It was hard to determine because it was intermitant. Then it seemed it would start to overheat when he ran the ac. This has over 100k. Next it was not firing on cylinder no. 3. Now no fire at all. We have checked the coils Put on different ones, Put a new ignition module plate and still nothing. One guy said it has to be the coil sensor. Is this the item on the underside of the ign. module that protrudes into the motor? And if so this one looks like it might be broke off. Can anyone tell me whats going on. And is there a link between the overheating and this no fire. I have heard that the 2.5 is a very good motor and its the worst they made. Is there a site that shows pics and info to help? Thanks Eric

[Buickfosure]

Well check the crank sensor that could cause a no spark situation. As for overheating the radiator itself may be clogged up inside and loose alot of efficiency so it may just need a new radiator. Also sometimes when a computer goes you will have some crazy effects just pick one up at the local junk yard give it a try.

[eric1961]

Well check the crank sensor that could cause a no spark situation.  As for overheating the radiator itself may be clogged up inside and loose alot of efficiency so it may just need a new radiator.  Also sometimes when a computer goes you will have some crazy effects just pick one up at the local junk yard give it a try.

Thank you