You need to remove the head and replace the head gasket.
If you do not know how to do this then get a mechanic to fix your engine.
SOURCE: mazda 626 2.2L replaced head
I can think of two possible causes:
1 - Assuming you are getting spark at the plugs, the distributor may be reinstalled 180 deg off.
2 - Unlikely but - Assuming you are getting fuel into the cylinders, the fuel injector connectors were reinstalled improperly and are firing out of sequence. If you are not getting fuel into the cylinders, it's something else.
SOURCE: 2002 Madza 626 4cyl car will not start. Has spark
It could be: clogged fuel filter, bad fuel pump, or the cutoff switch. Could be fuel pump relay. It's in the engine compartment fues block, and labeled "Fuel Pump"
If it's either the filter or the pump, replace both at the same time, it's cheaper.
The fuel cutoff in located in the trunk, along the driver side rear fender, you have to pull all the carpeting and such out on that side to get to it. It's marked "Fuel cutoff" Not sure on the 626, you might just have to push the reset button on the module.
However I doubt this is your problem I would think it's either the relay, the filter or pump.
SOURCE: 2002 Madza 626 has fire but seems like it's not getting gas
I had a similar sounding problem: my '02 626 would turn over but not start and I know my solution will sound strange but it worked. To start with I had a 4.5 year-old battery and I cranked on the starter until the battery started dying. I then left the car in my driveway overnight and the next afternoon, when I had time, I hooked it up to my battery charger (set on 'fast charge' ) and I pulled off one of the spark plug wires and tried to ground it then had my 17 year-old turn the starter over to see if we had any spark reaching the plugs. The car then started! While I was holding a spark plug wire in my hand! I replaced the battery that night and have not had a problem since (about 4 weeks ago). How old is your battery? Take it to a parts store that does battery diagnosis and have 'em check it out... It may just be your culprit.
SOURCE: my1999 madza 626 idles rough when its in drive or when i cut on
this could be a case of carbon debris in the throttle body plates and idle air control chambers...simply might just need serviced/cleaned...pull air intake off throttle body and spray with a good throttle body cleaner spray including the idle air ports. Ive also seen motor mounts cause this as this is more of a vibration felt in gear
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