I have a 1988 Honda CRX 16 valver. It has a cold air intake, tuned exhaust manifold and full stainless (Janspeed) exhaust. It has an ECU tuned to take advantage of the inlet and exhaust mods. The car does run very quickly but really doesn't like running much below 3000 rpm, won't rev cleanly past 7000, and has a "hunting" idle once warm. It is also running very rich. What should I be looking for?
Country: United KingdomMake: HondaModel: CRX SiYear: 1988Engine: 1.6 dohc
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Hello and welcome to Just Answers. My first suggestion would be to have the engine Vacuum tested. If you are expericing air leaks teh car will run very poorly at low RPM's. Vacuum pressure is created by the suction of air past the throttle body. The MAP sensor or (Manifold Absolute Pressure)measures the level of vacuum in an Naturally aspirated engine. Manifold vacuum decreases as the throttle body is open. This MAP sensor senses this change in pressure and richens the fuel mixture to compensate for more air being take in. If you have a leak then the vacuum is going away or "leaking" somehow. This will cause your rich condition. Check all of your hoses on the intake manifold for any cracks. The most typical vacuum leaks I have seen on those engine occur due to a bad throttle body gasket or Intake manifold gasket. Let me know if you have additional questions, I am confident this is where your problem lies though. If you don't please Accept and feedback is appreciated. Thank you
All makes and model vehicles. Specialize in imports. Honda/Acura master tech trained. Certified ASE Tech
This is an excellent answer. Thinking back I can relate the problem raising its head after I replaced the original vacuum hoses with silicon ones. I have a new ported and polished intake manifold and a new gasket (heat isolating) to fit so will check those gaskets as well. The MAP sensor was recently replaced. I will let you know after checking/replacing the above. Thanks again
Let me know how you make out