my2monkeys
NAXJA Member
- Location
- Mission Viejo, CA
Re: Bucking erratic rpms, moving or at idle 1991 jx
Try unhooking the o2 sensor and drive it. This will be in open loop mode, might disclose an o2 heater circuit problem.
Hook up the FP pressure gauge as to be able to view it thru the windsheild when driving so you can see pressures when it's bucking and surging.
Test the resistance on the IAT sensor and the ECT sensor. They should be app. 12,000 ohms at 70*f and less than 1000 ohms on a fully warm engine.
Also make sure you"ve done Cruisers Ground Refreshing. DO THIS FIRST
Try unhooking the o2 sensor and drive it. This will be in open loop mode, might disclose an o2 heater circuit problem.
Hook up the FP pressure gauge as to be able to view it thru the windsheild when driving so you can see pressures when it's bucking and surging.
Test the resistance on the IAT sensor and the ECT sensor. They should be app. 12,000 ohms at 70*f and less than 1000 ohms on a fully warm engine.
Also make sure you"ve done Cruisers Ground Refreshing. DO THIS FIRST