Pulled out the tester... - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Chevrolet When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 04-02-2011, 05:32 PM   #1
Senior Member
Posts like a Turbo
Thread Starter
 
espee1989's Avatar
 
Join Date: Dec 2010
Location: New York City
Posts: 394
Thanks: 0
Thanked 0 Times in 0 Posts
espee1989 is on a distinguished road
Default Pulled out the tester...

So I finally got some decent weather again, and decided to pull out the multimeter and look at some stuff on my impala.

I followed the procedures that Danthurs put up on the how to section, and tested ignition coil posts and the battery posts to test the charging system. I took a brief look, because I didn't want to do anything that could cause any problems since I don't want to get caught with having to fix something before the school week begins again (yes I'm sorta obsessively cautious, and I was unsupervised so I didn't want to pull too much apart).

Heres what I got
The coil for 4 and 1 had a resistance of 5.85 ohms and 6 and 3 had a resistance of 5.83. I would've tested the 5 and 2 but I was a bit worried about the state of the wires as well I have no di electric grease at the moment to touch them back up (will have to do that tomorrow). They look to be in bad shape. the ends are breaking apart and on top the they are looking worn, I was afraid that if I gave the wrong one too much force while pulling, id break one, so I left the two in the middle alone.

I did some testing with the battery posts as well. Heres what I got.

Car off: 12.6 volts
Car on, at idle: A wide variety of voltages, 14.7, 5.0, 8.0, 18.3, 3.7
The voltage was constantly changing, and it happened along with the contant shudder of the engine. If you guys don't understand what I'm saying, I'll gladly put up a vid if you guys prefer. Otherwise, you guys have any ideas?
espee1989 is offline   Reply With Quote
Old 04-02-2011, 10:56 PM   #2
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

dont get it. you put a meter on the battery and its going all over like that? either you have a lead thats not contacting properly or the cables on the battery or grounds aren't attached properly.

and if your boots are bad on that end and breaking down, there likely the same on the other end and its time to replace them.
jwfirebird is offline   Reply With Quote
Old 04-02-2011, 11:14 PM   #3
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Hmm, the voltage all over like that has me thinking a alternator problem, the 18.3 is really high, could be a bad voltage regulator. When the voltage drops, the spark gets weak and the engine will stumble.
Danthurs is offline   Reply With Quote
Old 04-02-2011, 11:25 PM   #4
Senior Member
Posts like a Turbo
Thread Starter
 
espee1989's Avatar
 
Join Date: Dec 2010
Location: New York City
Posts: 394
Thanks: 0
Thanked 0 Times in 0 Posts
espee1989 is on a distinguished road
Default

Quote:
Originally Posted by Danthurs View Post
Hmm, the voltage all over like that has me thinking a alternator problem, the 18.3 is really high, could be a bad voltage regulator. When the voltage drops, the spark gets weak and the engine will stumble.
Thats exactly whats happening, I think. Theres a lot of stumbling. The voltage is jumping up and down, and as that is happening you can hear/see the engine jolt in the bay.
espee1989 is offline   Reply With Quote
Old 04-02-2011, 11:30 PM   #5
Senior Member
Posts like a Turbo
Thread Starter
 
espee1989's Avatar
 
Join Date: Dec 2010
Location: New York City
Posts: 394
Thanks: 0
Thanked 0 Times in 0 Posts
espee1989 is on a distinguished road
Default

So what part should I be looking at?
espee1989 is offline   Reply With Quote
Old 04-02-2011, 11:37 PM   #6
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Pull the alternator out and have it tested.
Danthurs is offline   Reply With Quote
Old 04-02-2011, 11:47 PM   #7
Senior Member
Posts like a Turbo
Thread Starter
 
espee1989's Avatar
 
Join Date: Dec 2010
Location: New York City
Posts: 394
Thanks: 0
Thanked 0 Times in 0 Posts
espee1989 is on a distinguished road
Default

Autozone offers that for free, dont they?
espee1989 is offline   Reply With Quote
Old 04-02-2011, 11:48 PM   #8
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

I believe they do.
Danthurs is offline   Reply With Quote
Old 04-04-2011, 02:13 PM   #9
Senior Member
Posts like a Turbo
Thread Starter
 
espee1989's Avatar
 
Join Date: Dec 2010
Location: New York City
Posts: 394
Thanks: 0
Thanked 0 Times in 0 Posts
espee1989 is on a distinguished road
Default

I went to autozone this morning and they got their tester out, crimped the clips on the battery posts and checked the car while idle. The voltages did the same thing as Saturday and went all over the place. It started out at a low voltage (I forgot the number, maybe 9? I should've brought a notebook) and then it, did the random range of voltage then went to zero. On the rest of the drive up to school, the car jolted for about a mile. Any ideas?
espee1989 is offline   Reply With Quote
Old 04-04-2011, 02:42 PM   #10
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

what would have been better would be if you took the alt to the store and have them check it on there bench setup, them you can isolate the car from the equation
jwfirebird is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
out riding bored so pulled out the old cam and played a song lol cracker Your Ride: GM Pictures & Videos 10 05-24-2010 02:08 PM
Fuel pressure tester. ron350 General GM Chat 3 05-22-2006 09:56 AM
ICM Tester for Primaries BillBoost37 General GM Chat 6 05-12-2006 12:02 AM
Tester at Autozone padgett 1987-1991 4 02-28-2004 02:49 AM
Connection speed tester TaylorD Lounge 25 12-28-2003 08:46 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 06:20 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.