idle problems and O/D Problems

[shanneliszewski]

Currently when my car is in nuetral or park and running it has a rough idle when i put it in drive or reverse the car has a heavy jerking also the rmps needle is going slightly up and down at all times. when i am driving it i will get a jerk and the O/D light comes on and starts flashing, when i stop at a light i can put it in nuetral and rev the engine the O/D light goes back to normal.
the car has 149,000 miles on it, i am the second owner purchased the car with 70,000 mile on it and had the plugs replaced and drained and filled all the fluids when i purchased it.

i have replaced the following
air intake accordian hose which had a crack
Mass Air Flow sensor
speed control sensor
radiator temp sensor
spark plugs
wires and coil packs
cleaned throttle body
new battery

i took the car to ammco and they told me that i have a bad egr valve and with the O/D the mazda shop told be the wires on the O/D button may have become disconnected do these sound right or what are your thoughts?

 

[slavrenz]

Try cleaning your EGR valve first - there is a how-to on this forum, and at 149K miles, you are probably way overdue for this.

 

[fishdonotbounce]

Wow I'm surprised they actually gave you a straight forward answer. As the guy above me already stated, it is probably your EGR valve. Clean it using the How-to provided on this forum and if it gets better you're set. If it comes back after a little while, just replace the EGR valve. About 150 dollars for the part and you're set.

 

[StealthWyvern]

I dont know but I'd inspect the wires on the OD button first and their is a how-to to clean the EGR valve. Just follow the link in my sig.

 

[SocialStealth]

Clean your egr valvue, and seafoam your engine.

Use the spark plugs recommended here, apparently they make your idle 'smooth as buttah'

http://www.mazdas247.com/forum/showthread.php?t=123743151

 

[bazooka joe]

you may also have a transmission problem (OD light) go to the attached and look up FS tranny "system trouble shooting" to find your issue, good luck and let us know what you find out?
http://www.floptical.net/mazda/

 

[shanneliszewski]

i found out when i told the this family friend (ends up a hack) mechanic to replace my speed sensors he only replaced the output not the input and once i replace the input (pulse generator) it took care of the problem