infiniti j30 misses, not getting spark

beterday · #1 03-08-2005, 03:50 PM

I have a 1993 Infiniti J30. This car is the S--t. I love my car, however, for the last several months I cannot drive it because it is not getting spark all the time. 1.This is an intermittent problem 2. Sometimes the car runs great, sometimes it misses and I need to feather the gas through this period and then it begins to run fine, sometimes it just dies and is totally flooded and can not be restarted until it dries out. 3. I have taken the car to my Nissan dealer and they told me it could be: The mass air flow meter, the ignition module or the main computer. It also could be the coil packs. I have replaced the mass air flow meter, no help; I have replaced the ignition module, no help. My mechanic says he doesn't think it is the main computer as this is either no good or good, not intermittent. The coil packs are a remaining option, but do I buy six or one or what. Can I tell if they're good?

Nahkapohjola · #2 03-09-2005, 01:41 PM

Quote:

Originally Posted by beterday

.... The coil packs are a remaining option, but do I buy six or one or what. Can I tell if they're good?

Multiple problems, (things done has been waste. Seek another place for repair...) I am quite sure they did NOT give the old GOOD parts back to you? Next time demand that... they just love to rip anybody.

Some possibilities:
1. "sometimes it misses" --> one or two coils -or- leaking injectors
2. "sometimes it just dies"--> ecu power cutoff = ecu relay bad, ign switch or some other wiring cutoff (Bad MAF does not kill the engine)
3. "is totally flooded and can not be restarted"--> fuel regulator not working and fuel pressure goes too high... -or- leaking injectors

Whattodo, do one after the other -or- all at once:
A. If u think still of coilpacks, clean them with electronics cleaner, dry, spray their insulating structure with electronics insulator lacquer. 20$. Or just replace all +600$.
B. Swap ECU pwr relay 30$
C. Change ign switch; contacts bad?
D. Check fuel pressure when problem is on, or just replace fuel reg 50?$.
E. Do harness maintenance DIY: see my web pages, JUST HARD WORK.
click here: http://www.cardomain.com/memberpage/748507/14

.

infinman · #3 03-10-2005, 11:58 AM

Speedy_1234 · #4 03-11-2005, 10:22 AM

NO no Check take off a coil with the car on take the first one off first (warning)WHEN YOU TAKE IT OUT MAKE SURE YOU DON'T TOUCH IT CAUSE IF YOU DO IT SHOCK YOU Put it to the any metal part if you see a spark it work also when you take it off the car should go down and then back up (meaning) that the car rpm you can hear the car respone to the miss coil do that for all coil one at a time then check the fuel filter to see if it not clog cause if it it the fuel pump might be forceing the filter to get gas up and little is passing then when their enough it might let it all go out.(also) do you put only super in your tank

94J30t · #5 03-11-2005, 08:20 PM

whooooaaaaaaa....speedy!!!!! do not do that! you pcm is a gorund controler for all of your sensors. incase you dont know it switches ground opend and clsoe to control circuit components. so now you take your coil off and maybe put a spark plug in it and ground it on the engine to check for spark and now you sending (just a guess) 5Kv at idle through you chassis hoping and praying that your pcm doesnt get back fed through the ground wires, and end up with buying a new pcm on top of not ever knowing if you fixed the problem. it follows the same concept of welding on a car. technically you are supposed to completly remove the pcm....harness off then unbolt for the car and remove or insulated from any exposed metal (painted or unpainted) cause the power will back feed and poof. go to autozone or any parts store and buy a spark tester. looks like a spark plug but doesnt require you to ground to the car. just my 2 cents to save you a LOT more than 2 cents....

Nahkapohjola · #6 03-12-2005, 01:43 AM

Quote:

Originally Posted by 94J30t

whooooaaaaaaa....speedy!!!!! do not do that! you pcm is a gorund controler for all of your sensors. incase you dont know it switches ground opend and clsoe to control circuit components. so now you take your coil off and maybe put a spark plug in it and ground it on the engine to check for spark and now you sending (just a guess) 5Kv at idle through you chassis hoping and praying that your pcm doesnt get back fed through the ground wires, and end up with buying a new pcm on top of not ever knowing if you fixed the problem. it follows the same concept of welding on a car. technically you are supposed to completly remove the pcm....harness off then unbolt for the car and remove or insulated from any exposed metal (painted or unpainted) cause the power will back feed and poof. go to autozone or any parts store and buy a spark tester. looks like a spark plug but doesnt require you to ground to the car. just my 2 cents to save you a LOT more than 2 cents....

Crap. Speedys method is found in the FSM.

Speedy: no harm from spark. Lovely? no.

Speedy_1234 · #7 03-12-2005, 10:14 AM

Whats is fsm

Speedy_1234 · #8 03-12-2005, 10:16 AM

Also I never said with the spark plug off the spark plug stays in the motor only the coil you sperated to see if the idle goes down or does it stay the same if it stay the same something is wrong but if it changes then it goes up again then it ok that coil put don't have to remove the spark plug off just the coil

Nahkapohjola · #9 03-12-2005, 03:01 PM

Quote:

Originally Posted by Speedy_1234

Whats is fsm

Its the general acronym for nissan service manual: FSM field service manual.

www.autozone.com
http://carfiche.com/manuals/

GeneRally t here are six grounded plugs sparking into cylinders, right? In the myriad nissan computers there are no green men who could say where those plugs are located. Summa summarum: if u have one plug sparking anywhere -grounded- and stretch wires and coilpack there -even trunk- that does not make any diffrence. The spark has so minuscle current that it always drains into the chassis without any interference to computers. [radio interference stays always the same, in some cases might cause problems]

Plug is a plug is a plug is a plug is a plug is a plug is .
Spark is a spark is a spark is a spark is a spark is a spark .

From computers point of view, its the one and same where they happen to happen and sit.

Like u said.

94J30t · #10 03-12-2005, 03:04 PM

speedy, dont think i was dogging you at all...you dont hacve to take the spark plug off to do the damage. if you send that voltage through the ground then you can risk destroying the PCM. i dont know what fsm is but im just going what i was tought in school...it came form numerous instructors so if you want to do it thats fine but i am just advising you of the possible risks. i do agree with you that if you remove a coil and the idle doesnt change then you found your spark problem for the cylinder. same with a fuel injector. but like i said imnot dogging you at all im just trying to clear things up incase the guy having the problem does it and blows his pcm. it really is best that if someone doesnt know a lot about electronic diag then take the vehicle to a qualified service place and pay the money cause it may save you money if you try to fix it yourself. just be careful not to damage anything else while diagnosing it

Nahkapohjola · #11 03-13-2005, 02:43 AM

Quote:

Originally Posted by 94J30t

...if you send that voltage through the ground then you can risk destroying the PCM. ...

Stop writing until u can read: FSM.

There are six sparkplugs where 15.000V sparks are continuously routed to be grounded thousands times per minute. Inside cylinders. When these sparks jump to gnd, then there is an series-explosion to be heard. Ever heard that?

If not, then u engine will never be running.

Stop bs.

infinman · #12 03-17-2005, 12:01 PM

Nowhere in the FSM does it tell you to hold a coil or coil wire above the engine and let it ground against the engine block while running.Any engine that is ECM controlled should not be treated that way.The FSM does show you how to check for spark during cranking by inserting a sparkplug into the coil wire or coil and groung plug to engine block.Anyone who knows about automotive electronics knows the farther you hold a plug wire from ground the higher the voltage gets.This is not good for anything.Read the FSM {if you have one}and then you stop the bs.You{Nak}post a lot but say very little.You need to stop giving people poor and incorrect info.There are people here already confused.

infinman · #13 03-18-2005, 11:46 AM

Btw:What does the cartoon of the car supposed to represent?

picciuca · #14 12-15-2005, 03:15 PM

Was anyone ever able to successfully test for a spark? Did this problem ever get resolved?

I am stranded in my garage.

Please help if you can.

Thanks.

drape123 · #15 12-17-2005, 05:48 AM

what kind of spark plugs you running in your J? I had bosch +4's in mine, but they destroyed themselves. (porcelain around electode melted)
then i switched back to NGK's (i run the V Power) and my car runs perfect.

it's worth a try, at 1.99 a plug.

Quote:

Originally Posted by picciuca

Was anyone ever able to successfully test for a spark? Did this problem ever get resolved?

I am stranded in my garage.

Please help if you can.

Thanks.

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