1987 Accord LXi. Car has the 2.0L FI engine with 170K miles. Compression is 170 PSI on each cylinder. Idle when cold is irregular. Once started the RPM hits 1500 slowly dropping to 1000 (over about 10 sec) then drops to 100 and almost dies. The RPM then rebounds back to 1000 and continues hunting for about 1 minute. The idle is still rough until the car is warm and seems rough (vibration) 80% of time at operating temp. While in drive. I have checked for external vacuum leaks, cleaned the IAC and EGR. I have new wires, plugs etc…Over the past year I have replaced fuel injectors, fuel filter, fuel pump and tank. I have the service manual and have measured the coolant and intake temp. Sensors that send a signal to the ECU. They seem to be close to the temp/resistance curves in the book. I checked the fuel injector ballast resistors that should be 5-7 Ohms and are measured 12 Ohms. I don’t think these are the problem even if slightly out of spec. Last weekend I disassembled the distributor to check if oil was obstructing the ‘Cyl’ and ‘TDC’ pick-ups for the crank sensor. They seemed clean. My feeling is a missing/false signal is being sent to the ECU and causing the hunting condition. A mechanic said look for vacuum leaks and question the valve springs and valves. Also there are NO codes set.
have the same problem?
Tuesday, August 29th, 2006 AT 11:22 AM