Surging problem when driving

[mazdamanik]

I'm haveing the same problem as Anton but my cars completly stock SOHC....so if anyone could suggest anything it would be good....its seems to happen to my car only when ive been driving for about 30 min...it also revs unevenly as somtimes sitting at lights it will raise the revs to about 2000 htne drop to 1500 then back to normal idol.....would this have anything to do with the choke as that seems to be the range it works in when the car is cold?

[anton]

im glad im not the only one with this problem

[mazdamanik]

yeah its a real pain...im taking mine to the mechanic next week so if he finds out wats wrong ill let you know...personally i think my engine is past its used by date so it could be any number of things but if i find the problem ill let u know

[anton]

Thanks mazdamanik

[mazdamanik]

hey anton i think i may have found my problem not sure if it will work for you though....my tapper cover gasket is broken and is 1. leaking oil into my spark plugs and 2. loosing pressure which i think may be the problem....i get it fix sat so if it works ill let u no

[anton]

well i took it back to the tuning guy and he had it for a week to see if he could sort this problem out.. well he thought he had fixed it by puting a pull down resistor in the ignition wiring but it still did one surge on the way home, so there is still no fix to the problem. I asked if he thought it could be a dodgy fuel pump but he was sue it wasnt. I also asked if i needed an aftermarket fuel regulator but he was also convinced it wasnt anything like that. so now im here again back were i started with the same problem.. im thinking i might just have to put up with this problem.

[Cosmo Dude]

When in doubt you should go back to basics and return anything modified back to stock, reset the ECU and after a little read the engine error codes if any.

[mazdamanik]

obviously its nothing to do with your mods anton if my car is abolutly stockl as is doing the same thing....how ur head gasket? so far i havnt been able to find the problem on mione either but there is no way in hell im putting up with it cause i tihnk its getting worse and more frequent...do you notice it starts happening once the car is at running temp and been there for like 30-40 min?

[anton]

mine does it randomly whenever it wants really..its done it cold once and when its been runningn for a while aswell.. so yeh i cant say it only happens at certain times

[mazdamanik]

Car goes to mechanic again on thursday so whatever is doing the surging its not fixed....yet, hopefully the mechanic can find wats wrong with it this time if i find out anton i will let you know thursday night

[anton]

cheers mate

[mazdamanik]

Hey man look like i found the problem...the mechanic checked the error codes and found the coolent temp sensor and oxygen sensor are faulty....that looks like the problem the oxygen sensor is going beserc and telling the engin its running lean so it increase the full....but its fine so its flooding the engine hence the surge its to much fuel.....the new sensor goes in sat so if it works ill let u now but it looks like that is wat is wrong.

[mazdamanik]

DUDE DUDE.....IT WORKED.....THE CARS FIXED it was teh oxygen sensor..get ur mechanic to replace it and see how u go see if that fixes the problem.

Good luck man let me no if it fixes it

Catchya