Subject	Re: it has an issue
Posted by	wellcraft on January 13, 2014 at 5:45 PM
	This message has been viewed 328 times.
In Reply To	it has an issue posted by 300ZMang on January 11, 2014 at 01:34 PM
Message	I did part of the leak test today but I'm not done yet, I'll be done with that tomorrow. I'll be trying to check the coil packs and injectors also tomorrow but I would like to understand how do I check the injectors, when I was reading some info I found this... The easiest and safest way to determine which cylinder(s) may contain faulty injectors is to inhibit spark from each cylinder one by one noting the changes in RPM. This can be done by disconnecting the connector that provides voltage to the spark coil sitting on each cylinder while the car is idling. Do not disconnect the injector connector while car is idling, it may cause damage to the ECU. A cylinder is firing correctly if the RPMs drop slightly when power to the spark coil is removed. Hence, when plugging the connector back in the RPMs should raise slightly (and run smoother). This means that specific cylinder is getting the appropriate amount of fuel and has a good spark. However, if the RPM's stay the same after the plug is disconnected it means with or without spark that cylinder is not firing. But now, my question is, they didn't mentioned so I assume is OK but I ask because I wanna make sure, I remember working on my cars and boats long time ago that when you remove the spark plug cables you get the SHOCK of your like by getting electrocuted, this will not happen when disconnecting the coil pack connector? I also remember reading somewhere that u can use a long spark plug wire from a pathfinder to do some other test but can't remember nore find that thread, they were checking something but I'm not sure if it was for the coil packs or what, any body has any idea, what else should I check while performing this test? I remember with older cars feeling the same thing (hesitation), when I wasn't getting a good spark on one of the cylinders or when pressure washed the engine and the distributor got wet I remember feeling almost the same, just trying to describe what I'm feeling. Also, I went to get some gas and when I removed the gas cap I didn't feel any release pressure as it usually happens, could this affect somehow? My other Z always release pressure when removing the gas cap. Will try to perform also the cooling system as I totally forgot about that and need to search how to do it. Thanks guys.
Follow Ups	Another Z with hesitation problems. - wellcraft 19:46:46 01/09/14 Re: Another Z with hesitation problems. - wellcraft 20:02:11 01/09/14 Re: Re: Another Z with hesitation problems. - wellcraft 20:22:33 01/09/14 What about vacuum leaks then? - Zinister1 20:47:58 01/09/14 Re: What about vacuum leaks then? - wellcraft 21:05:46 01/09/14 You can purchase them from Z1 or from the maker - Hydrus (Dallas) 21:26:35 01/09/14 Re: You can purchase them from Z1 or from the maker - wellcraft 21:56:12 01/09/14 You can search the forums as many people have built - SammybTT(TN) 21:31:17 01/09/14 Re: You can search the forums as many people have built - wellcraft 09:00:45 01/10/14 Re: Another Z with hesitation problems. - pfitzgerald 10:49:33 01/10/14 I had similar symptoms with a failing fuel injector. - Agent X 11:59:35 01/10/14 I would do wiring checks. - Woody75 (Denver) 13:07:15 01/10/14 Next time you feel the hesitation, perform a power - 300ZMang 13:16:56 01/10/14 Re: Next time you feel the hesitation, perform a power - wellcraft 15:05:13 01/10/14 AIVs (n/m) - Woody75 (Denver) 15:07:14 01/10/14 Re: AIVs - wellcraft 18:34:49 01/10/14 it has an issue - 300ZMang 13:34:13 01/11/14 Re: it has an issue - wellcraft 17:45:07 01/13/14 I've never disconnected a FI while car was running - 300ZMang 08:23:11 01/14/14 Re: - wellcraft 09:26:13 01/14/14 Re: - wellcraft 19:04:18 01/14/14 Yea that's normal, but not TOO much. - 300ZMang 09:38:30 01/15/14
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