How to test the ignition coils on 98 camry I4? - Toyota Nation Forum : Toyota Car and Truck Forums
3rd & 4th Generation (19921996 & 19972001) Toyota Camry Discussion for years: 1992-1996 & 1997-2001 Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

Reply
 
LinkBack Thread Tools Display Modes
#1 Old 02-05-2009, 04:30 PM
New TN User
 
Join Date: Jun 2004
Location: USA
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
iTrader Score: 0 reviews
(Thread Starter)
4th Generation How to test the ignition coils on 98 camry I4?

Could any one tell me how to test the ignition coils? My car check engine light is on, and I had it checked at advance auto parts and was told that #2 and #3 cylinders misfire. I replaced the spark plugs immediately, but the problem is still there. Then I checked the resistances of the four spark plug wires, which are 8.5K, 8K, 6K, 5K. Are they too high? Should I replace the wire set as well? I also tried to measure the resistances of both ignition coils. From the manual, I know the resistance of the 2nd coil should be from 9.7-16.7K. Mine looks good. But I don't know what's the right value for the 1st coil. Could any one tell me?

Also I was wondering how to check the resistance of the fuel injector?

Thanks a lot for help!
stanleyeye is offline  
Sponsored Links
Advertisement
 
#2 Old 02-05-2009, 10:19 PM
Senior TN Member
 
Tom 2000's Avatar
 
Join Date: Jul 2005
Location: Lake Stevens, WA
Posts: 1,008
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 5
Thanked 18 Times in 18 Posts
Garage
iTrader Score: 0 reviews
Did you clear the code after you replaced the plugs?

Tom

2004 Prius Touring Edition x2
2000 Camry LE - Lunar Mist Metallic
Tom 2000 is offline  
#3 Old 02-06-2009, 01:29 AM
Certifiably Insane
 
96paseo's Avatar
 
Join Date: May 2006
Location: Carversville, PA
Posts: 1,459
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Thanks: 33
Thanked 164 Times in 150 Posts
Garage
iTrader Score: 1 reviews
Don't worry about clearing the codes until the engine runs right. You'll know when its fixed if you've got an ignition or injector problem. You can test the ignition coils with a multimeter. The best way is to check the injectors and coils. Pull your plugs a to confirm which cylinder(s) has the misfire, then check your injector with an ohm meter. Pull the harness connector off(squeeze the tab first) and put the 2 probes on the terminals. If your injector reads a short, high resistance or open, the injector is bad. A good reading should be 13-14 ohms. If your injectors check out fine, then the coil is most likely the problem since injectors don't usually go bad in pairs. The resistance on the plug wires is good. 1st coil should be the same or close to the second. Good luck

1996 Paseo 5E-FE 270,xxx miles - LR parking brake seized. Time for new cables
1993 Camry LE 5S-FE 281,xxx miles - Time to re-seal spark plug tubes. Ugh I hate winter...
1997 Mazda B2300 219,xxx miles - Engine/trans back in, drives great
96paseo is offline  
#4 Old 02-06-2009, 01:53 AM
just a nobody
 
Join Date: Aug 2008
Location: NW corner
Posts: 5,997
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 4 Times in 4 Posts
iTrader Score: 0 reviews
The ignition coils should be the same; one for cylinders #1 and #4 and the other for #2 and #3. Sounds like you have a bad coils or connection problem, since both cylinders are on the same coil.

N.E.O.
new echo owner is offline  
#5 Old 02-06-2009, 03:33 PM
Darkside Cut Me!!!
 
Join Date: Jan 2004
Location: Vaughan' Ontario
Posts: 2,036
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 1
Thanked 27 Times in 27 Posts
iTrader Score: 3 reviews
You also need to check spark plug wire #2 and #3, both required to complete circuit.

2004 RX330 Sport
2003 Cam I4 XLE
2000 Cam XLE Gold Edition V6
1998 CamCE I4 Super Commuter!
Hajoca is offline  
#6 Old 02-06-2009, 10:46 PM
New TN User
 
Join Date: Jun 2004
Location: USA
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
iTrader Score: 0 reviews
(Thread Starter)
guys, thanks a lot for your help.

paseo, I will do what you said step by step. May I just disconnect the spark plug wire to confirm which cylinder misfires?

If I have to replace the fuel injectors, do I need to release the fuel pressure first?

Also, I have a very stupid question, how can I know which coil is no.1 coil, which is no.2?

Thanks again
stanleyeye is offline  
#7 Old 02-06-2009, 10:52 PM
just a nobody
 
Join Date: Aug 2008
Location: NW corner
Posts: 5,997
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 4 Times in 4 Posts
iTrader Score: 0 reviews
The cylinder numbers are right on the coil if they are the original coils. Switch the plug wires from one coil to the other, if #1 and #4 cylinders are misfiring, then the coil is the problem.

N.E.O.
new echo owner is offline  
#8 Old 02-06-2009, 11:36 PM
New TN User
 
Join Date: Jun 2004
Location: USA
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
iTrader Score: 0 reviews
(Thread Starter)
Quote:
Originally Posted by new echo owner View Post
The cylinder numbers are right on the coil if they are the original coils. Switch the plug wires from one coil to the other, if #1 and #4 cylinders are misfiring, then the coil is the problem.

N.E.O.
Hi N.E.O.

Actually, I found the coil connected to #2 and #3 is wet. If I switch the plug wires from one coil to the other, will this cause any trouble? I though the order of each cylinder firing can not be changed. Could you tell me about this? Sorry, I don't know much about car.

Thanks
stanleyeye is offline  
#9 Old 02-06-2009, 11:42 PM
just a nobody
 
Join Date: Aug 2008
Location: NW corner
Posts: 5,997
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 4 Times in 4 Posts
iTrader Score: 0 reviews
If the coil is wet, that may have some bearing on why it is misfiring.

Anyway, the coil fire both plugs at the same time; it is a waste spark ignition system, one plug fire from positive to ground and the other from ground to positive. When you switch the plug wires you will need to switch the small connector from the ECM too; the ECM will know which coil to trigger as long as you switch all the wires and connectors.

N.E.O.
new echo owner is offline  
#10 Old 02-07-2009, 03:57 PM
New TN User
 
Join Date: Jun 2004
Location: USA
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
iTrader Score: 0 reviews
(Thread Starter)
Hi guys, I read the code again, this time shows only #3 cylinder misfiring. I guess maybe the fuel injector is the problem, but some guy at Auto store checked my car and told me the problem should be the coil. He told me that if the fuel injector bad, the smoke should be really bad but mine is fine. So I was wondering if the coil is bad, is it possible that one cylinder connected to this coil works fine, the other misfires?

Thanks
stanleyeye is offline  
#11 Old 02-08-2009, 07:08 PM
New TN User
 
Join Date: Jun 2004
Location: USA
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
iTrader Score: 0 reviews
(Thread Starter)
replaced the ignition coil today, but no luck, the problem is still there. furthermore, I got one more code, P0300, multiple/random cylinder misfire, I think maybe because I didn't change the throttle body gasket since I haven't got it. Next. I am gonna replace the fuel injector though the resistance seems ok. Before I do that, I have several questions. Do I need to release the fuel pressure to replace fuel injector? The spark plug in cylinder #3 replaced a few days ago is completely black now, do I need to replace it again?

Does any one can help me? appreciate
stanleyeye is offline  
#12 Old 02-08-2009, 11:47 PM
Certifiably Insane
 
96paseo's Avatar
 
Join Date: May 2006
Location: Carversville, PA
Posts: 1,459
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Thanks: 33
Thanked 164 Times in 150 Posts
Garage
iTrader Score: 1 reviews
Which cylinders did the new coil get attached to? Did you try putting the old coil back in and replacing the other one? Isolating the bad coil should be your priority. If you still have the old coil, try putting it back on and replacing the other one. If you switched the coils like NEO said, you may have replaced the good one. You said the coil is wet. Wet with oil or water? Also, don't change your injector if it reads good. Take readings on all your injectors and compare them. If one measures significantly higher than the others, it may be bad. If your plug is black and dirty, just wire brush it and wipe it clean. It should still work. Throwing parts at it will only help you spend more money. Pin-pointing your diagnostic approach will help you get it fixed. Just be patient and thorough. If you're able to post pics, put em up. It will help us help you.

1996 Paseo 5E-FE 270,xxx miles - LR parking brake seized. Time for new cables
1993 Camry LE 5S-FE 281,xxx miles - Time to re-seal spark plug tubes. Ugh I hate winter...
1997 Mazda B2300 219,xxx miles - Engine/trans back in, drives great
96paseo is offline  
#13 Old 02-09-2009, 12:39 AM
New TN User
 
Join Date: Jun 2004
Location: USA
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
iTrader Score: 0 reviews
(Thread Starter)
Quote:
Originally Posted by 96paseo View Post
Which cylinders did the new coil get attached to? Did you try putting the old coil back in and replacing the other one? Isolating the bad coil should be your priority. If you still have the old coil, try putting it back on and replacing the other one. If you switched the coils like NEO said, you may have replaced the good one. You said the coil is wet. Wet with oil or water? Also, don't change your injector if it reads good. Take readings on all your injectors and compare them. If one measures significantly higher than the others, it may be bad. If your plug is black and dirty, just wire brush it and wipe it clean. It should still work. Throwing parts at it will only help you spend more money. Pin-pointing your diagnostic approach will help you get it fixed. Just be patient and thorough. If you're able to post pics, put em up. It will help us help you.

Hi paseo, The new coil is for cylinder #2 and #3. I didn't change the other coil. Actually the coil is wet with oil coz I found some oil leaking through the valve cover gasket, and of course I replaced the gasket already today. I measured all the resistances of four fuel injectors, and they are quite close, all around 15 OHM. I will try to switch the plug wires and coil connectors to double check the coils. Does the right resistance of fuel injector gaurantee the fuel injector is fine? Thanks
stanleyeye is offline  
#14 Old 02-09-2009, 12:18 PM
New TN User
 
Join Date: Jun 2004
Location: USA
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
iTrader Score: 0 reviews
(Thread Starter)
I am gonna switch fuel injectors too to see the misfiring cylinder is gonna change or not...
stanleyeye is offline  
#15 Old 02-09-2009, 10:58 PM
just a nobody
 
Join Date: Aug 2008
Location: NW corner
Posts: 5,997
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 4 Times in 4 Posts
iTrader Score: 0 reviews
Did you switch the coil and plug wires?

BTW, did you do a compression test on the engine?

N.E.O.
new echo owner is offline  
Sponsored Links
Advertisement
 
Reply

  Toyota Nation Forum : Toyota Car and Truck Forums > Toyota Passenger and Sports Car Forums > Camry and Solara Forum > 3rd & 4th Generation (19921996 & 19972001)

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Toyota Nation Forum : Toyota Car and Truck Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome