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Posted on Mar 06, 2009
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Can't turn the idle down, 87 fuel injected honda prelude

I need to pass california emissions and my car i failing at idle and the timing is off. The problem is my car idles around 1500 when you first start it and drops only to 1250 when its warmed up, it runs pretty well and it passes emissions in every other area including high rpm emissions. The idle screw is turned all the way down and I have had the vacuum lines checked for routing and leaks, no problems. Occasionally the idle jumps up and down and I did notice once that blocking the intake hose?/air flow tube? when the car was cold seemed to drop the idle a bit but does nothing when its warm. please help!

  • aprilchaplin Mar 06, 2009

    disconnecting the battery didn't help

×

4 Answers

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  • Master 916 Answers
  • Posted on Mar 06, 2009
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Check the spark plug gaps, and make sure that the plug wires are on correctly

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  • Contributor 34 Answers
  • Posted on Mar 06, 2009
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Their is a electric plunger type throttle speed control that should be bellow the throttle screw or on the opposite   side of the throttle butterfly  u should be able to un plug this or at least ajust it to slow it down  when the throttle speeds up  and down listen in the engine compartment for a clicking  noise  it will be hard to hear .  when u have found it  unplug the relay thats clicking  and replace  because its faulty  and causeing your problem 

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  • Master 8,619 Answers
  • Posted on Mar 06, 2009
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Hi!

You will have to use the CA emissions converter, also check your O2 sensor.

  • Anonymous Mar 06, 2009

    Also clean the ports of the EGR valve(Exhaust Gas Recirculation).

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  • Master 5,158 Answers
  • Posted on Mar 06, 2009
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Try resetting the computer by unhooking the battery for ten minutes

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Related Questions:

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Vacuum hose diagram for 89 honda prelude

Hi there:
I suggest check this links, according with the fuel system:
- Fig. 62: Vacuum hose routing-1989 carbureted Prelude (except California)
- Fig. 63: Vacuum hose routing-1989 carbureted Prelude (California)
- Fig. 64: Emission component schematic-1989 carbureted Prelude
- Fig. 65: Vacuum hose routing-1989 fuel injected Prelude


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87 chev van 350ci,failed 1 of 4 emissions test(HC

Hydro Carbons are usally from an engine missfire. It may be that it is such a sligh miss that you cannot feel it. What is your timing set at? I would try setting it at 2* advanced and see what that does for you.
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89 Honda Prelude failing emissions rich

is everything stock? and you have catalitic converter in place?

Stop by Schucks auto supply and have them run the codes. i'm sure there is a code if you cant pass emissions. your check engine light bulb is probably out.

and usually the first cause is the first o2 sensor.
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Can't turn the idle down

you have 2 idle settings. one is for cold and one is for after the engine has warmed up. So find the scew that goes to the warm engine idle. turn it down and your set. You might need a Chilton to find what you are looking for.

tepfy
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1988 handa accord

I have an 87 Accord with fuel injection that always had a fast idle, and a surging problem when warming up. Both problems went away when I replaced the fast idle valve, which is bolted to the rear of the intake manifold just downstream of the throttle body.
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Hesitation on acceleration

vacuum very important on this car number hoses & replace one by one. see how it runs. if problem continues check emission sticker & make sure the hoses r conected to the proper tubes.
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This prelude model on my experience the cause of in emission either map sensor near the throttle body and the small hose is connected. Next the coolant sensor below the distributor w/ two wires and the fuel pressure is cause by bad fuel pressure regulator at the end of fuel rail or the fuel return line closed. I hope this will give help to you.
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