# Odd idle

**URL:** <https://community.cartalk.com/t/odd-idle/13058>\
**Category:** Maintenance/Repairs\
**Created:** [April 19, 2008, 4:00pm UTC](https://community.cartalk.com/t/odd-idle/13058 "2008-04-19T16:00:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Daves92gt](https://avatars.discourse-cdn.com/v4/letter/d/7ea924/32.png) [@Daves92gt](https://community.cartalk.com/u/Daves92gt)\
**Post date:** [April 19, 2008, 4:00pm UTC](https://community.cartalk.com/t/odd-idle/13058/1 "2008-04-19T16:00:48Z")

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1988 Nissan truck with z2.4i 4 cyl and 5 speed.  
  
  
  
 My truck does not want to idle properly. On start up with temps below 50 it stalls at idle until warmed up, above 50 it doesnt stall but only runs at about 300 rpms. Once warmed up it will sometimes idle at about 900-1100 rpms and suddenly drop to 400 rpms for a few minutes. It will also sometimes stall when coming to a stop, whether the trucks warmed up or not. Heres a list of what I have done within the past 3 months, the problem existed before and after these things.  
  
  
  
 New plugs, wires, cap and rotor  
  
 New distributor  
  
 New O2 sensor  
  
 New fuel pump and fuel filter  
  
 New MAF sensor  
  
 Replaced all vacuum lines  
  
 Set timing and idle (did this when it  
  
 would idle)  
  
 Compression check (all cyl at 155-160)  
  
 Checked for leaks at intake and exhaust  
  
 manifolds  
  
 New PCV valve  
  
 New/Used throttle body (which replaced TPS,  
  
 injectors, mixture heater and  
  
 pressure regulator)  
  
  
  
 I did check for codes, it isn’t throwing any. Which doesn’t say too much on this engine it’s pre OBD so it isn’t too bright, their isn’t even a check engine light. Sorry for the length, but I figure too many details in this case is better than too few. Thank you for any help, this problem is driving me insane.

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [April 19, 2008, 4:45pm UTC](https://community.cartalk.com/t/odd-idle/13058/2 "2008-04-19T16:45:49Z")

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Your vehicle does have a Check Engine light. So the bulb is probably burned out.

As to your problem, it might be with the Air By Pass/Idle Air Control motor. This came with the used throttle body you installed. So the original throttle body may have had a defective ABP/IAC motor. And the used throttle body may have a defective ABP/IAC motor.

Tester