HELP! new to forum, running on 5 cylinders!

bartZ32 · 07-15-2009, 01:13 AM

Hey guys, I'd hate to start off with a plea for help lol but I've really run into a wall on this one. I recently bought my first z, a 1990 twin turbo to be exact. It's been my dream car for years and now that I finally have one, I can't drive it because of this issue!

I have posted this same topic on NICO with no luck, so I'm expanding my horizons in hopes of getting some much needed help before taking it to the dealership for $98/hour.

I have cleaned ptu, injector, and cop connections. I have also changed out all spark plugs with ngk's (yes, the correct ones lol) and gap is adjusted properly.

I am experiencing no spark on the front driver's side cylinder. I did the power balance test to confirm this is the only dead cylinder. The coil pack harness on the dead cylinder is the only new one, put on by the owner before me (I think he knew of this problem but failed to tell me about it).

I then swapped coil packs with a known good cylinder and did the power balance test again with the same results, ruling out a bad coil pack. I also did the ohm test to double-check..it's definately ok.

I used a 9v battery to touch the injector connectors and heard the TICK, ruling out a bad injector.

I used both a test light AND multimeter to confirm that my ground wire and constant power wire to the dead cylinder coil pack are good (middle and right wire). However, the one at fault is my signal wire (left wire on cop). I believe this is true because the reading on my multimeter for signal wire was different than the other good ones, though I'm not sure if I did this correctly.

My questions:
1. What do I check next?
2. What is likely the problem?
3. Is there a way to test signal wire? Can't be done with engine not running, or can it?

Thanks in advance. I hope once I get this squared away I'll be more of a help than a burden to this forum.

KasbeKZ · 07-16-2009, 07:25 PM

well, it seems obvious, but if it were me, i'd like to re-affirm if the problem was due to lack of spark, or lack of fuel. so i'd take the coil pack out, stick the plug in it, turn it over and put the plug near something metal to see if it sparks

thetremendousti · 07-16-2009, 08:40 PM

Hi! Welcome to Zdriver! I dont know anything about Z32s!! And I barely know anything about S130's and S30's! But, welcome and best of luck to you!!

ZLover4Life · 07-16-2009, 11:28 PM

You did *not* rule out a bad injector. Test resistance across injector leads, should be 10-14ohms.

91zxtt · 07-18-2009, 07:08 PM

Quote:

Originally Posted by ZLover4Life

You did *not* rule out a bad injector. Test resistance across injector leads, should be 10-14ohms.

Agreed....this is likely your problem.

bartZ32 · 07-28-2009, 10:54 PM

can someone please explain why I can't respond.."Post rejected because of a score of: 91 Rejection set to: 30."

07-16-2009, 07:25 PM	#2
KasbeKZ Pr0n Addict Join Date: Sep 2007 Location: virginia Posts: 4,623	well, it seems obvious, but if it were me, i'd like to re-affirm if the problem was due to lack of spark, or lack of fuel. so i'd take the coil pack out, stick the plug in it, turn it over and put the plug near something metal to see if it sparks __________________ 1990 300ZX N/A 5-speed Z32's take ATF in the power steering system.

07-16-2009, 08:40 PM	#3
thetremendousti w0rld's l0ngest m0t0rswap Join Date: Sep 2007 Location: Torrance, CA Posts: 676	Hi! Welcome to Zdriver! I dont know anything about Z32s!! And I barely know anything about S130's and S30's! But, welcome and best of luck to you!! __________________ no more zs for me

07-16-2009, 11:28 PM	#4
ZLover4Life Encyclopedic Knowledge Join Date: Aug 2005 Location: Naperville, IL Posts: 3,307	You did not rule out a bad injector. Test resistance across injector leads, should be 10-14ohms. __________________ The worst kind of advice comes from people who pretend to know something in order to feel intelligent or useful.

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07-28-2009, 10:54 PM	#6
bartZ32 Registered User Join Date: Jul 2009 Posts: 12	can someone please explain why I can't respond.."Post rejected because of a score of: 91 Rejection set to: 30."