1987 Nissan Maxima Repair Question
Mileage: No information provided.
Won't start
1987 Nissan Maxima 6 cyl Front Wheel Drive Automatic 200000 miles
Started 3 times in about 15 min few days ago,First time started right up,Second time it idled at 500RPM,Third time it idled 400rpm then died.Have Spark,Gas on plugs,apparently no vaccum.The only thing that sounds like vaccum is at the Fuel Press Reg.I assume that is gas building up,but you would think it would stop at a certain point.Don't know how accurate ECM is when car is not running but it said Idle Valveis bad.Checked circuit w/meter it was good,replaced anyway.Used known good ECM unit recheck Idle Valve circuit it still read as bad.(BY THE WAY CAR CRANKS BUT WON'T START)
Asked by DownDogAnswer
Hi DownDog, Welcome to 2carpros and TY for the donation
.(BY THE WAY CAR CRANKS BUT WON'T START)
Lets do below to determine if its fuel or spark problem and then get back with me with results so that I can continue to assist
Get a helper disconnect a sparkplug wire or 2 and ground it to the engine at least 3/16 away from ground -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it.
Got light colored from spark plug wire not blue.Plugged spark plug into into boot and spark from element accross to the end looked weak,how should it look.It appeared as if there was a lot gas on the end of spark plug,how should that look.How can I test fuel pressure if car won't start.It cranks,can I test it that way.I've only tested pressure when cars were idling.Sprayed Carb Fluid over engine and no sign of vaccum leak.If it can be tested will you give me an idea of what the pressure should be.
It should be a snapping blue-test the coil for the fuel pressure -hook it up on the test port and turn key on. Should be 30psi