bout too give up on the car i got about 1000$ into fixing her and nothing seems to work can anyone please give me some way to turn has anyone experianced this problem any help will be great asap ive worked on this car for a month now and its about to go over a cliff =P heres whats going on :

idol speed is correct ,fan comes on when i jump the connectorss for the timeing and set up timeing light it rotates the destributor and the timeing does not change

note: it backfires through the intake and exaust when going from idoling to full throttle

i checked my fuel pressure , gave it a complete ignition tune up, changed teh timeing belt
and all timeing marks are dead on [:@][:@][:@][:@]

no vacume leaks i checked with accetalyn

 

my bad i forgot too mention its a 95 mazda 626 2.5L V6

 

5 speed

 

Make sure that you aren't off by 180 degrees on your TDC timing placement.

The 4-stroke cycle is suck, squeeze, bang, blow (Intake, Compression, Ignition, Exhaust) and the piston is at TDC twice within that cycle. If your spark is occuring during the intake cycle (rather than the compression cycle) you will get back-firing through the intake.

 

.... stilll didnt fix it the timeing was dead on ... does anyone have any more suggestions before the car goes off a cliff??

thanks

 

I had the same problem with my 95 Protege and it turned out to be the MAF (mass air flow) sensor. What I had to do was remove it from the air box assy. and clean the air flow sensor inside. This sensor is a very thin wire internally (when looking through the MAF tube) and is VERY sensitive to any contaminant. Normal driving can get it dirty. Be sure to use NON CHLORINATED brake cleaner or electrical parts cleaner to flush the inside if the MAF and sensor wire and being very careful not to touch the thin wire as it is very fragile. I re-installed the MAF and the car ran like new again.