96 mazda 626

mazda 626 2.5l dohc v6 im driving home the other dat car running good thin it starts running like it needs a tune up stumbling with a miss. i did a tune up plugs wires nothing checked the injestors all have gas everything is like it should be but still missing like a POS. i was told i could have a burnt valve but i was also told it wouldnt start out of the blue driving like that it would happen gradually. i would love some help on this problem i dont know what to do and dont realy want to do a valve job on this car.


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How many miles on it?

Has it had timing belts replaced?

Were the spark plug holes full of oil?

Bogie

spark plugs had alittle oil aroung the top of the plug stock timing belt 253,000 miles

A few things come to mind for starters, vacuum leak, egr, but it could be allot of things. I recommend checking for codes to get you in the right direction.

it was flashing misfire in cylinder 4 after the tune up everything got worse car is now flooding out wont start half the time miss like crazy and shooting a ton of gas or water out the exhaust

double check the connection on both ends of the plug wires. Gave you checked the cap and rotor?

i have not checked the cap and button yet i didnt think that only 1 cylinder would miss fire if the cap and button was bad also the car did sit for a year befor we bought it

Way overdue for cam belts, they are like an every 60-80 thousand mile item with this engine.

Bogie

after looking last night i found someone had put a new belt on it brand new

Distributor cap will cause 1 cylinder not to fire. They break internally. I would also double check your firing order, it is easy to make a mistake. Also look at the inside of the cap for oil, if the seal in the distributor has gone bad it will leak oil into the cap and cause all sorts of issues.

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Chet

ok what i will do today is compression test check cap and bleed fuel lines check firing order

I've got a 93 MX-6 with a 2.5. If this is the same motor, it might have a bad distributor. They have the cam sensor, ignition module and coil all built into the disty. It's a common problem with them.

It is very similar to the Honda setups. The cap and oil seals are real common issues

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Chet

well compression is fine all about the same about 5 off of each other firing order is right cap and button are fine i guess im going to check fuel relay and pump becouse it looks like it isnt getting fuel now mazda should have bought a chevy

i would like to think all of you for your help but after all the time i think we found it their is a fuse the egi inj under the hood that is blown and keeps blowing we have a short