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!
Re: can't turn the idle down, 87 fuel injected honda...
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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Hi Lasbs, Check the ignition timing and adjust with a stroboscopic timing light. The correct timing should be 10 degrees BTDC. If the vehicle is fitted with a carburetor, I believe it needs adjusting correctly, or with the Honda carb, it may be easier to replace it. If the vehicle is fuel injection carry out a diagnostic scan. Also make sure that all vacuum tubes are fitted tightly and that there are no cracks or broken joints. Regards John
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.
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.
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.
This problem is a little bit hard to coz you need to check the following throttle body, fast idle valve & the IACV valve. First the throttle body it must fully closed during idle and the TP sensor voltage must be 0.5 volt. The fast idle valve is wax type there is a 2 small hose pass below of this valve, if the coolant water is not circulating the valve will not closed. You can check it by touching the lower portion of this valve after 1 min. Regarding the IACV you can check if this is the fault by removing the hose connecting the throttle body and air filter. there is 2 small hole near the opening of the throttle body, while the engine is running at idle close one by one and see which one cause this problem.I hope this will give help to your problem.
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.