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Author
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Topic: Iddle Surging
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86 T TOPS
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Member # 8855
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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
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TTOPNGT
Posts: 704 | From: redwood city | Registered: Jan 2009
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LXjames
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Member # 10791
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posted
If you have no cel except for when the maf is unplugged you could try a base idle reset
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On Point Motorsport prez.
King Lx
Posts: 4761 | From: Pittsburg CA | Registered: Mar 2011
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92_5.0
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Member # 7624
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posted
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.
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Infineon/Sears point? same difference!
11.8 @ 115 mph @ Sac Raceway
411 rwhp 402 trq (old set up)
540 rwhp 517 rwtrq (new set up)
ET's to come
Posts: 1629 | From: bay area | Registered: May 2007
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rollininmy50
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Member # 9067
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How many miles on motor?
Posts: 439 | From: sactown | Registered: Apr 2009
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86 T TOPS
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Member # 8855
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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.
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TTOPNGT
Posts: 704 | From: redwood city | Registered: Jan 2009
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rollininmy50
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Member # 9067
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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.
Posts: 439 | From: sactown | Registered: Apr 2009
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92_5.0
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Member # 7624
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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.
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Infineon/Sears point? same difference!
11.8 @ 115 mph @ Sac Raceway
411 rwhp 402 trq (old set up)
540 rwhp 517 rwtrq (new set up)
ET's to come
Posts: 1629 | From: bay area | Registered: May 2007
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*Als50*
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Member # 6003
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posted
Clean or replace your IAC Valve and do the same to your EGR.
Posts: 1897 | From: La Bahia... | Registered: Sep 2005
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86 T TOPS
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Member # 8855
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posted
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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TTOPNGT
Posts: 704 | From: redwood city | Registered: Jan 2009
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