After changing the water pump; the car will not start

https://www.smogtips.com/smog-question/4127/How-To-Fix-and-Clear-OBD-II-Trouble-Code-P1000

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Check the timing belt. If it was removed to change the pump, it may have been put on a tooth or two off, out of time.

if the water pump was a internal water pump it runs off timing belt. timing may be out. This happens alot and it dosent have to be out much to keep it from starting. This could be the problem if it is a internal pump and happens alot. I have fix alot of cars with this problem.

yes. the impellor on these engines have a tendency to come off the water pump.First you can see if the pump is working by removing a heater hose then have someone to start the engine. if the water sprays a good, solid stream out then the water pump is good. if the water just barely comes out or not at all then the pump is weak or "bad".

is your car cranking while you try to start it or not ?

i just changed the water pump on a 1995 isuzu rodeo and now it wont start///??????? it has spark and i have even tried starting fluid and still nothing ...... what could be the problem

The noise could thn be coming from the power steering pump, its worth checking before you go for the water pump!

I would go to auto zone and get a diagram and the timing belt and do it yourself and the water pump (no it does not have to be changed everytime the timing belt is changed but if the car has over 60,000miles then it is best to change them both) it is not that hard especially if the car is not out of time just make sure you disconnect the negative side of the battery

The opti-spark distributor cap is below the water pump.
Often a leaking water pump will cause a short in the distributor
Due to the amount of time and labor cost to remove the water pump, and that fact that the water pump has to be removed to replace the distributor cap, it is a good idea to replace the distributor cap at the same time the water pump is replaced. The water pump is driven by a pinion shaft with an " O " ring. Be sure to replace the " O " ring too else you may shortly develop an oil leak at that point.

Hi Michael,

The motor shut off and the engine light came on, you won’t start right away and you wait a couple of days and start it again, sounds like your engine was over heated and because it is too hot and the engine frozen.

There are several kinds of engines, water cooling ,oil cooling and air cooling.

Over heated can cause many different problems for the cars, you should check step by step yourself.

Water cooling engine; if you know, you can help somebody.


1. Check the radiator see if you have enough coolant
2. Check the oil see if you have enough oil
3. check the water pump see if the water pump works fine
4. check the thermostat see it is function right.


Suppose your radiator has water or coolant, leave your radiator cap open, start your engine, let it is running 10 to 15 minutes and wait it is getting hot and see the water in your radiator, if the water moves, that means your cooling system works fine, otherwise either the thermostat frozen or the water pump was broken.

You mentioned when you re-start your car, sounds like a diesel engine, please check the where the noise from, if the noise from the water pump area, that means you need to change the water pump. When you change the water pump, change the thermostat at the same time, because when the engine over heated, the thermostat maybe damaged.

Oil cooling engine, check the oil pump. If the noise from the oil pump, you need change it.


Good luck,

Frank