This is topic Iddle Surging in forum Tech Talk at Northern California Ford Owners  .


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Posted by 86 T TOPS (Member # 8855) on :
 
Hey folks i have a 90 coupe 5.0 5 speed all stock and the iddle surges.i have so far xleaned Mass air, AIC and TB. Also tried 3 diffrent Mass sensor and still surges even if i unplug it, and when i do unplug the mAf check engine light comes on. Also all vacumm lines seem to be good but i will double check them this weekend. Im sure this is a common issue any help will be appreciatted. Thanks fellas
 
Posted by LXjames (Member # 10791) on :
 
If you have no cel except for when the maf is unplugged you could try a base idle reset
 
Posted by NK2186 (Member # 12319) on :
 
check this out bro http://sbftech.com/index.php/topic,1031.0.html
 
Posted by 92_5.0 (Member # 7624) on :
 
you can also try an adjustable IAC plate from early 90's taurus. It has two adjustable set screws and goes in between the IAC and throttle body. Sometimes they work, sometimes they don't. You can find them at just about any junkyard.
 
Posted by rollininmy50 (Member # 9067) on :
 
How many miles on motor?
 
Posted by 88DroptopGT (Member # 2535) on :
 
Pull any codes?
 
Posted by 86 T TOPS (Member # 8855) on :
 
23Xxx miles im sure its gone around once sinece it was a calufornia highway patrol. And no i havnt ran any codes yet i will tomorrow.
 
Posted by rollininmy50 (Member # 9067) on :
 
If say 120+ miles and other parts replaced still no change, this will not take a long time but there is that metal tube that connects each head together , this is located in the rear between motor and firewall. I believe two half inch bolts connect this, remove it and see if it's plugged up or almost? If so heads and intake are getting Carbon'd up and the car is struggling to breath. This is my thought or could be as simple as the tps sensor out of balance and you may need to recalibrate.
 
Posted by 92_5.0 (Member # 7624) on :
 
quote:
Originally posted by rollininmy50:
If say 120+ miles and other parts replaced still no change, this will not take a long time but there is that metal tube that connects each head together , this is located in the rear between motor and firewall. I believe two half inch bolts connect this, remove it and see if it's plugged up or almost? If so heads and intake are getting Carbon'd up and the car is struggling to breath. This is my thought or could be as simple as the tps sensor out of balance and you may need to recalibrate.
That pipe is a PITA to remove and will not effect the idle.
 
Posted by *Als50* (Member # 6003) on :
 
Clean or replace your IAC Valve and do the same to your EGR.
 
Posted by 86 T TOPS (Member # 8855) on :
 
Thanks guys i have not even looked @ it since but will try all of the above. Ive been busy on my brothers 97. Thanks fellas i will keep you guys updated,hope its an easy 1.
 




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