Delasangre4231 Posted August 20, 2009 Share Posted August 20, 2009 So after I fixed the fuel injector my 83 zx has been getting progressively worse and is starting to worry me. I am 99% positive the fuel pump is bad. I am replacing it in the next week just to be sure. I also have the other problem. Is there any sensor that controls fuel flow at speed? Like depending on RPM, as in more RPM=more fuel to engine? Also what else could be causing general rough runnning? I have done so much and every time it runs good again then something else is going out... I ran out of ideas of parts to replace... One more... It has been getting hotter than usual for the past week or so. I had a leak in the overflow bottle and I just replaced it and there is no leak anymore but its still getting a bit hotter than usual. New part sense I bought it: Plugs, wires, cap, rotor, thermostat and gasket, radiator system flush, fuel injector, FPR, fuel dampener, tank sending unit, main fuel filter, fuel pump relay... Quote Link to comment Share on other sites More sharing options...
Robert Posted August 20, 2009 Share Posted August 20, 2009 The AirFlowMeter could cause rough running as well. Man, youre out of luck on this car If all those parts have broke in a short time.. Fuel pumps generally work or dont, sometimes they get weak, if thats the case, then the more you open the throttle, the worse the problem gets. Feel the fuel hose just before the rail. There should be small pulses in the line at idle. Id have a look at the AFM. Quote Link to comment Share on other sites More sharing options...
Delasangre4231 Posted August 20, 2009 Author Share Posted August 20, 2009 What am I looking for when it comes to the AFM? I do feel pulses so my fuel pump is probably ok? Quote Link to comment Share on other sites More sharing options...
Robert Posted August 21, 2009 Share Posted August 21, 2009 What am I looking for when it comes to the AFM? I do feel pulses so my fuel pump is probably ok? Probably yes. If It delivers enough to pulse the lines at Idle, It probably does at cruising as well. The AFM can be tested with an Ohmeter (search the forumweb), but the easy way is to borrow one and just try If thats possible.. Sometimes you can measure a AFM, and it looks great, but once its in duty, It starts acting weird again. Also, check that the movable parts is not stuckslow and that it returns when you push it.. Quote Link to comment Share on other sites More sharing options...
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