Question about Nissan Cars & Trucks
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Posted on Jan 02, 2017
SOURCE: no pulse on fuel injectors
If you dont have injector pulse it is probably a loose or not connected ground.I would double check all wiring.Is this the 2.4 liter.If so did you pull the timing cover off to remove the chain or did you fashion a wedge to hold chain from falling off crank gear.If you did the latter then i would check that the timing is correct.Because even with the wedge in place there is a good chance that the chain skipped a tooth on the crank gear.I hope this was helpful..Good Luck!!!
Posted on Aug 04, 2008
SOURCE: no pulse at injectors
The normal way that injectors are controlled is via the permanent application (ignition on obviously) to one side of the coil that operates the enclosed piston, and the precisely timed application of ground (negative) to the other side of the coil.
The transistors that control this switching under the command of the engine computer are typically contained within the computer itself.
Measuring the voltage at the injectors is not productive since the common multimeter is incapable of detecting the very short pulses that activate the coil. Some kind of visual means would be needed to observe this pulse such as an oscilloscope or an engine analyzer equipped with a 'scope.
It's unlikely that all of the switching transistors (or the injectors) have failed simultaneously so either the computer has a problem or there is no fuel being delivered to the fuel rail that feeds the injectors. You should find a pressure regulator that sits between the fuel line coming from the tank that controls the fuel pressure for the injectors. This device seem to be a sore point in many vehicles and can make it appear that the injectors are not working. Many fuel rails have a fitting similar to a tire valve to allow the testing of the pressure being delivered. I would recommend you check this before assuming that the injectors are at fault.
Posted on Nov 14, 2008
95-97 Maximas had a problem where condensation from the A/C would accumulate in the a/c evaporator case from the drain becoming restricted or blocked, When this would occur, condensation would drip onto the ECM and a problem would develop with misfire and/or starting. I would look at the ECM where the harness connects to it for corrosion problems. If you find it, there is a chemical spray which can be used to clean the terminals and/or you can clean them, although it is time consuming and difficult to due because of how small the terminals are. After things are cleaned up, lightly coat the connections with a dielectric grease. This will prevent electrolysis.I believe you can buy these at Radio shack and possibly at an automotive parts supplier.
Also a drop in voltage during the cranking phase will cause a weak spark. Your ignition is what pulses the injectors. It takes a minimum of 9.6 volts, but ideally you want at least 10.5 or more during the cranking phase if you want to get a spark worth anything. Check the voltage on the primary side of the coil while cranking the engine.
I'll watch to see if things work out for you, let me know. ....mybunkey
Posted on Apr 18, 2009
You should see it right by the compressor pulley. It will be a aluminum colored tubing with a cap on the port. The compressor pulley is the one that engages and disengages when the a/c is on.
Posted on Aug 01, 2009
Have a bad knock sensor on my 06 villager and no problem driving it daily, most likely you may have a coil problem, fuel pump or MAF sensor problem. Hope this works
Posted on Jan 11, 2010
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