Blas671 Posted October 18, 2016 Report Share Posted October 18, 2016 Idle problem on new carb for 1985 nissan z motor ... 1 Quote Link to comment
datzenmike Posted October 18, 2016 Report Share Posted October 18, 2016 Care to elaborate? Too fast Too slow No idle Stalls at stoplights Stalls when cold Stalls when hot 2wheel drive or 4x4 1 Quote Link to comment
Blas671 Posted October 18, 2016 Author Report Share Posted October 18, 2016 Stalls weather cold hot and at lights.... tried messing with idle screw and all it did was like got richer the gas smell... it's 2 wheel drive ..... 1 Quote Link to comment
datzenmike Posted October 18, 2016 Report Share Posted October 18, 2016 Does it have a round 6 wire connector at the back or a smaller connector with just two wires? Going to guess it's the former. It has to have all the wires and sensors connected and working including an O2 sensor for proper mixture feedback. This carbs mixture and idle are governed by an ECU under the pass side seat that constantly adjust the carb primary jet. If there is a failure in the system it will try to go into a limp home mode or over rich condition to protect the engine from a damaging over lean mixture. It will run poorly and give terrible mileage. Please don't tell me you have a weber now. 2 Quote Link to comment
Charlie69 Posted October 19, 2016 Report Share Posted October 19, 2016 1985 should be electronic carb with 6 wire connector unless a 4 wheel drive then it could throttle body injected. This all depends on if it is stock. spray some carb cleaner or starting fluid around the base of the carb where it bolts to the intake manifold while it is running. if the engine gains RPM while spraying it has a base gasket leak causing a vacuum leak which will not let engine idle. Also check for other vacuum leaks. EGR is notorious for vacuum leaks on the Z24. Quote Link to comment
Charlie69 Posted October 21, 2016 Report Share Posted October 21, 2016 Any progress? Quote Link to comment
Blas671 Posted October 21, 2016 Author Report Share Posted October 21, 2016 Yes man thanks .... no leaks on manifold or around carb did notice it fires on demand with starting fluid .... trucks been sitting before I bought it so I filled with gas and cleaned egr. fires right up ... 1 Quote Link to comment
Charlie69 Posted October 22, 2016 Report Share Posted October 22, 2016 Put a can of SeaFoam fuel treatment in with your next fill up. Quote Link to comment
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