First of all, much thanks to everyone who posts answers to questions on this forum. You guys have saved me loads of time and cash by helping me fix stuff myself. From headlight relay to dash lights to ECU codes this site is excellent.
Now to my question...
My 94 J30 started running rough this past Sunday. Last night I cleaned the MAF and no change. Then I started unplugging coils. The number 6 looks like the culprit since there was no change when pulling that one. All others affected RPM when unplugged.
Before I go looking for a coil, my question is how can I tell if the issue is truly the coil and not an injector? I know there's an electrical test, but I don't have any equipment for that. If I need that I guess I could get it, but if there's another way, that would be much faster for me.
All advice is appreciated and thanks again for past help!
Bob
Modified by BobWilson at 3:22 PM 6/10/2008
coil vs. injectors
-
driverdriver
- Posts: 3397
- Joined: Fri Aug 01, 2003 10:36 am
- Car: NICO's longtime resident Canuck!!!
- Contact:
Re: (driverdriver)
I can probably find a working coil fairly easily.driverdriver wrote:Welcome to NICO!!!
There is no sure fire way to tell if its a coil or injector (happened to me) other than switching a non working coil with a working one and seeing what happens.
Have you ohm tested your injectors. They should be within the 10 to 14 ohm range.
I don't have the equipment to test the injector, but I'm realizing that I will need this more in the future, so I'll try to pick up a multimeter.
I'll try the one I can get to first!
-
Gerardjg
- Posts: 544
- Joined: Tue Jan 24, 2006 2:09 pm
- Car: 2007 Cobalt LS
2011 Hyundai Accent
2016 Kia Optima - Location: Central Florida
Re: (BobWilson)
First try what Driver says and switch the coil that does not change the rpm when unplugged with one of your others. If the problem moves it's the coil at fault. Do get a multi meter comes in handy for trouble shooting with the service manual.
-
edgartheace
- Posts: 368
- Joined: Wed Sep 27, 2006 3:33 pm
- Car: 1993 240sx, 1992 300zx RIP, 1993 300zx 2+2, 1993 Infinti J30t
Re: (BobWilson)
One way to know if it is the coil is just swap Coils 4 and 6. If the cylinder giving you trouble jumps to four now then its the coil. If it stays at six then it is your number six injector that went bad. Another way is to use a mechanics stethoscpoe on the number 6 injector and listen for the loud clicking of the injector firing, or just check the injecter resistance. It should be between 12-16 Ohms. If it is infinate resistance replace it.
-
gr8scott72
- Posts: 1220
- Joined: Thu Feb 16, 2006 1:37 pm
- Car: 1994 Infiniti J30t
Re: (edgartheace)
Yeah, you don't have to GO find another working coil. You already have 5 others that you know are good. Swap and see what happens.edgartheace wrote:One way to know if it is the coil is just swap Coils 4 and 6. If the cylinder giving you trouble jumps to four now then its the coil. If it stays at six then it is your number six injector that went bad. Another way is to use a mechanics stethoscpoe on the number 6 injector and listen for the loud clicking of the injector firing, or just check the injecter resistance. It should be between 12-16 Ohms. If it is infinate resistance replace it.
If it's your coil, email me and we can work something out. I have a few spares.
Re: (gr8scott72)
Ha, that's a great point. I'll try the swap idea.gr8scott72 wrote:
Yeah, you don't have to GO find another working coil. You already have 5 others that you know are good. Swap and see what happens.
If it's your coil, email me and we can work something out. I have a few spares.
Re: coil vs. injectors
I always just got a nail (making shure its a firm fit into the lead) unplugged the lead from the coils put the nail into the lead making shure not to touch the nail place the end of it towards the coil if u see a spark u know its working