Poor Idling Quiz... - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


General GM Chat When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made. Chat about all things GM (and related cars). Off-topic stuff should be in the Lounge, and all Model specific mechanical problems should be posted in the proper forum.

Reply
 
 
 
Thread Tools Search this Thread
Old 12-04-2006, 04:02 PM   #1
Guest
Certified GM nut
Thread Starter
 
Join Date: Jul 2004
Location: West Point, Utah - Village Idiot
Posts: 1,606
Thanks: 0
Thanked 2 Times in 2 Posts
SSE Motorhead is on a distinguished road
Default Poor Idling Quiz...

Here’* a little test. Well, not really a test, I just want to see if anyone else thinks the same way I did…what kind of diagnosis you might come up with.

Car: 93 SSE (n/a), 195k miles

Symptoms: Car “stumbles” at idle (i.e. does not idle smoothly) – idles ok, stumbles, idles ok, stumbles (not cyclic, however, no “rhythm” to it). Seems to run fine otherwise (no noticeable hesitations, surging, etc. while at speed or under acceleration).

Recent maintenance (within last couple months): New alternator, new radiator, replaced power steering pump, new tires. (Some or all of these may not be applicable to problem, just giving you information that was available to me).

What do you think the problem was (it’* fixed now)? Ask questions if you need more information.
SSE Motorhead is offline   Reply With Quote
Old 12-04-2006, 04:22 PM   #2
Retired Moderator
True Car Nut
 
Pearl_bonnie02's Avatar
 
Join Date: Sep 2006
Location: Northwest Indiana
Posts: 3,047
Thanks: 0
Thanked 0 Times in 0 Posts
Pearl_bonnie02 is on a distinguished road
Default

EGR Valve?? My Sebring was just like that, idle was crappy and all over, but no loss in power.
Pearl_bonnie02 is offline   Reply With Quote
Old 12-04-2006, 04:30 PM   #3
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

EGR isn't functional at idle, but if there'* a leak in PART of it, it could affect idle by letting in un-metered air.

I'm betting the dirty TB/IAC was the issue, or a vacuum leak.
willwren is offline   Reply With Quote
Old 12-04-2006, 04:34 PM   #4
Senior Member
True Car Nut
 
Join Date: Jan 2005
Location: Montevideo, MN MWBF '05, '06, '07 WCBF '06 '07 survivor
Posts: 3,882
Thanks: 0
Thanked 0 Times in 0 Posts
sonoma_zr2 is on a distinguished road
Default

Haven't we had people of this cars vintage having these problems caused by exhaust manifolds leaks also? they are sucking in outside air and causing the O2 sensor to adjust on false data.
sonoma_zr2 is offline   Reply With Quote
Old 12-04-2006, 05:05 PM   #5
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

I'd look at plugs and wires.. check battery connections and look at the O2 for wire # 4 and 6 possibly touching it.
BillBoost37 is offline   Reply With Quote
Old 12-04-2006, 05:30 PM   #6
Guest
Certified GM nut
Thread Starter
 
Join Date: Jul 2004
Location: West Point, Utah - Village Idiot
Posts: 1,606
Thanks: 0
Thanked 2 Times in 2 Posts
SSE Motorhead is on a distinguished road
Default

Thanks for playing. It'* about 2:30 here. I'll give you until 3 pm my time for any more thougths. Good answers so far, but I won't tell you if any of them are right...yet.
SSE Motorhead is offline   Reply With Quote
Old 12-04-2006, 06:42 PM   #7
Guest
Certified GM nut
Thread Starter
 
Join Date: Jul 2004
Location: West Point, Utah - Village Idiot
Posts: 1,606
Thanks: 0
Thanked 2 Times in 2 Posts
SSE Motorhead is on a distinguished road
Default

Interesting that nobody mentioned the fuel system. No matter, 'cause that wasn't it. I had all kinds of things running through my mind and rather than shoot blindly I had it scoped. Turns out the coils were working overtime trying to keep the fire lit because my sparkplugs have been in there since 1927. Everything else was fine. I'm such a DOLT. I didn't think the plugs were that old, but the truth is they've been in there for a very long time. To add insult to injury, I'd actually looked at one of them within the last month. Gap was a little big at .063, but otherwise looked fine. They were Bosch platinums, however, with the electrode that is flush with the insulator. Closer inspection reveals that the electrode has burned down into the insulator.

So, bottom line - a new set of plugs and she'* purring like a kitten. And because I'm such a dumba$$, I've already scheduled myself for a flogging.

Thanks for humoring me by taking the quiz. While Boosty was the only one who mentioned plugs, I'm certain if the rest of you had more information (which I purposely held back) you'd have nailed it right off. I didn't. I was ready to swap the engine.
SSE Motorhead is offline   Reply With Quote
Old 12-04-2006, 08:38 PM   #8
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

The reason nobody nailed is because most of us replace our plugs fairly often, particularly at the onset of ignition-miss problems.
willwren is offline   Reply With Quote
Old 12-04-2006, 08:50 PM   #9
jdq
Senior Member
Posts like a Corvette
 
Join Date: Nov 2005
Location: Hamilton, Ontario , Canada
Posts: 1,201
Thanks: 0
Thanked 0 Times in 0 Posts
jdq is on a distinguished road
Default

Course Boosty was right , he had 10 guesses ha ha
jdq is offline   Reply With Quote
Old 12-05-2006, 11:30 AM   #10
Guest
Certified GM nut
Thread Starter
 
Join Date: Jul 2004
Location: West Point, Utah - Village Idiot
Posts: 1,606
Thanks: 0
Thanked 2 Times in 2 Posts
SSE Motorhead is on a distinguished road
Default

Quote:
Originally Posted by willwren
The reason nobody nailed is because most of us replace our plugs fairly often, particularly at the onset of ignition-miss problems.
EXACTLY! That'* why I left that particular bit of information out of the equation. I can't believe I left those plugs in there for so long! Although you guys probably wouldn't have believed anyone was as big a conehead as I am and hadn't changed my spark plugs in the last decade (aren't they supposed to last for-ev-er?). I had myself sufficiently flogged, however, and won't be changing plugs at 30 year intervals anymore.

Boosty cheated and shotgunned the answer: "I'd check the wiring, gas, plugs, rotate the tires, recline the seat, sniff the exhaust...
LOL!
SSE Motorhead is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Poor, Poor GTP!(now with before pics) sse1990 Lounge 22 07-07-2004 01:19 PM
Look at my poor poor trunk, what's wrong with this? TaylorD General GM Chat 19 03-20-2004 08:54 PM
that poor poor neon...like i care! SSEimatt93 Lounge 4 10-22-2003 03:48 PM
poor poor civic LOL SSEimatt93 General GM Chat 6 05-12-2003 11:05 AM
Poor Poor Hollywood :( Tamara 1992-1999 3 11-17-2002 07:28 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 12:47 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.