Skip - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 09-04-2004, 11:55 AM   #1
Senior Member
True Car Nut
Thread Starter
 
Join Date: Feb 2004
Location: Western MA
Posts: 2,708
Thanks: 0
Thanked 1 Time in 1 Post
randman1 is on a distinguished road
Default Skip

As I continue to work on the 93, I developed a skip on the motor while running. I figured it was no big deal cause I haven't got to any of the tune up parts yet. Yesterday I changed plugs and wires and the skip is still there. I had the ignition module tested at Napa today and it passed all 5 tests both times tested. No one local here seems to be able to test the coils (or willing to) so I used the procedures in Techinfo to test them . Nothing seemd out of the ordinary. The primary resistance was 1.0 to 1.2 ohms and the continuity buzzer on the multimeter buzzed. The secondary resistance was 5.84 to 5.87 k ohms.

I'm scratching my head on this one wondering what it could be. I posted a problem about a high idle condition after removing and cleaning of the TB. I was wondering if injectors could be be a suspect of both problems.
randman1 is offline   Reply With Quote
Old 09-04-2004, 01:29 PM   #2
Senior Member
True Car Nut
Thread Starter
 
Join Date: Feb 2004
Location: Western MA
Posts: 2,708
Thanks: 0
Thanked 1 Time in 1 Post
randman1 is on a distinguished road
Default

Welp, Captian Obvious swooped down from the stratosphere and told me to disconnect the injectors one by one while the car was idling. When I disconnected injector #3, there was no change in idle. Disconnecting the others made it idle even worse.

So I have a faulty injector, it seems. What now? Just replace it? Have it tested? Cleaned?
randman1 is offline   Reply With Quote
Old 09-04-2004, 03:01 PM   #3
Senior Member
Certified GM nut
 
Join Date: Feb 2003
Location: Georgia
Posts: 2,095
Thanks: 0
Thanked 0 Times in 0 Posts
DrJay is on a distinguished road
Default

Well it depends on if its a clog or an electrical problem.

Start off by starting the car and listening carefully to the injector, you should hear it tick.
If not then check voltage at the connector.

Then you can do a leak test. Free way - Raise the fuel rail with paper towels under the injectors and pressurize the system. Look for that #3 injector to leak.

Depending on what happens with the above stuff you can look at getting them cleaned/rebuilt.
DrJay is offline   Reply With Quote
Old 09-04-2004, 09:55 PM   #4
Senior Member
Posts like a Northstar
 
Join Date: Aug 2004
Location: Hawaii
Posts: 570
Thanks: 0
Thanked 0 Times in 0 Posts
dblack1 is on a distinguished road
Default

the only thing you proved by disconnecting the injector is which cylender it came from. try a comression test. if your compression test goes well it is a fuel system problem (assuming the rest of the ignition system is fine).
dblack1 is offline   Reply With Quote
Old 09-04-2004, 10:32 PM   #5
Senior Member
True Car Nut
Thread Starter
 
Join Date: Feb 2004
Location: Western MA
Posts: 2,708
Thanks: 0
Thanked 1 Time in 1 Post
randman1 is on a distinguished road
Default

Quote:
Originally Posted by dblack1
the only thing you proved by disconnecting the injector is which cylender it came from. try a comression test. if your compression test goes well it is a fuel system problem (assuming the rest of the ignition system is fine).
I guess that I wasn't thinking of it that way. Can I remove the new plug to narrow the problem down? What can I expect to find if it is fuel related? Spark related? I don't own a compression tester so I guess this is a good time to invest in one. I'll try a compression test tomorrow on that cylinder too and see that I get.

I used the screwdriver up to the ear trick to check the injector for clicking and it was. It seemed a litter quieter than the other two front injectors though.
randman1 is offline   Reply With Quote
Old 09-04-2004, 10:37 PM   #6
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

is it skipping like a little school girl? heh, I just had to ask!

sorry can't help, I can just make a joke

-justin
opensourceguy is offline   Reply With Quote
Old 09-05-2004, 08:52 AM   #7
Senior Member
True Car Nut
Thread Starter
 
Join Date: Feb 2004
Location: Western MA
Posts: 2,708
Thanks: 0
Thanked 1 Time in 1 Post
randman1 is on a distinguished road
Default

OK, here'* the latest. I swapped the 1/4 and the 3/6 coil this morning. Started it up and disconnected the #3 injector. The idle was worse. I then disconnected the #1 fuel injector and the idle remained the same. My problem has moved from the #3 cylinder to the #1 cylinder with the coil swap. Soooooooo...

It looks like it is the coil to blame (that is if my troubleshooting was done in the correct way). My next question is should I replace it with a stock-like coil or can it be upgraded without doing the other 2 at the same time?
randman1 is offline   Reply With Quote
Old 09-05-2004, 09:58 AM   #8
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

upgrade man!! go all out. you can wait on ebay for a good deal to come by [there is one seller selling MSD'* 3/$100 I think]. Or you can wait a little like I did, and see if someone is selling a used set. I have yet to find the MSD coils in Jeg'*, it seems they have discontinued them.


-justin
opensourceguy is offline   Reply With Quote
Old 09-05-2004, 11:33 AM   #9
Sol
Senior Member
True Car Nut
 
Join Date: Sep 2002
Posts: 8,909
Thanks: 0
Thanked 0 Times in 0 Posts
Sol is on a distinguished road
Default

Your stock coils provide plenty of spark. I'd say just get the OEM kind.
Sol is offline   Reply With Quote
Old 09-05-2004, 11:39 AM   #10
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

too much is never enough


-justin
opensourceguy is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1995 GMC 5.7 engine skip kbbandit33 GMC/Chevrolet Truck/SUV 3 10-21-2013 07:33 AM
intermitting miss or skip 2 blue bonne's 1992-1999 4 05-07-2007 04:17 PM
Skip Shift with Stock PCM streetracer 2000-2005 0 10-09-2003 01:05 AM


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 03:09 AM.


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.