 Why won't my car idle right? |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
| BPGREER |
 Nov 16 2004, 06:36 PM
Post
#1
|
|
Member  Group: Members Posts: 131 Joined: 29-September 04 From: SAN FRANCISCO Member No.: 2,857  |
OK, I'm once again stumped. My car just won't idle smoothly. It sounds like it's going to die, but then revs itself up a bit, then almost stalls again, then revs again... So, I thought it might be a vac leak. I had already replaced all of the hoses, but found that I had leaks on the air intake runner things, where they connect to the plennum. So, I disassembled everything, replaced those hose-type things, and voila! No more vac leak there. Problem is, still not idling right. It's just as bad now as before. One more thing, I slowly brought up the rpms from the throttle body, to listen, and I think I heard a couple of really quiet backfires. Maybe an exhaust leak? Could this cause a bad idle? Thanks.
Brian |
   |
 
|
Posts in this topic
BPGREER Why won't my car idle right? Nov 16 2004, 06:36 PM
Bruce Allert :bump:
Mines doin' the exact same thang damm... Nov 16 2004, 07:06 PM SirAndy <... Nov 16 2004, 07:22 PM Mueller the intake plenum has been known to fail as well, ... Nov 16 2004, 07:27 PM BPGREER I checked with brake cleaner initially. Thats how... Nov 16 2004, 08:07 PM muddboy my '73 has allways "hunted" for idle to a very... Nov 16 2004, 08:18 PM ws91420 Not too familer with older FI. On modern FI hunti... Nov 16 2004, 08:28 PM vsg914 Your idle should not "hunt". not even 100rpm. The ... Nov 16 2004, 08:36 PM vsg914 opps, forgot the link
http://members.rennlist.com... Nov 16 2004, 08:36 PM BPGREER I've read, read, read, I just don't always... Nov 16 2004, 08:52 PM vsg914 How did you set the tps? Nov 16 2004, 09:04 PM BPGREER I used the tech article fm PP with an ohmmeter. Nov 16 2004, 09:09 PM BPGREER BTW, I still don't understand about the co adj... Nov 16 2004, 09:11 PM vsg914 Very good. It should be adjusted right. Be sure to... Nov 16 2004, 09:21 PM ws91420 The TPS is a varible resistor. What can happen is ... Nov 16 2004, 09:24 PM JohnnyX In addition to VSQ's last very good basic tuni... Nov 16 2004, 09:46 PM BPGREER I set the fuel pressure to 29psi. I took the TPS ... Nov 16 2004, 09:53 PM ClayPerrine <... Nov 17 2004, 07:12 AM vsg914 The adjustment knob is on the top left of the ecu.... Nov 17 2004, 07:24 AM Bleyseng First set the timing to spec. 27 degrees BTDC at 3... Nov 17 2004, 09:00 AM mike_the_man :agree: with what Geoff just said. A hunting idle... Nov 17 2004, 12:23 PM BPGREER I do need a new AAR. Mine does not open all the w... Nov 18 2004, 04:28 PM mike_the_man The AAR shouldn't cause a problem with the idl... Nov 18 2004, 04:48 PM mike_the_man Check out this thread on exhaust leaks.
exhaust l... Nov 18 2004, 04:54 PM BPGREER Mike,
Thanks for the link. I do feel some hot air... Nov 19 2004, 12:47 AM Bruce Allert To get to the exhaust stud nuts remove the tin sur... Nov 19 2004, 08:28 AM vsg914 I don't use a torque wrench on exhaust studs u... Nov 19 2004, 08:40 AM BPGREER Thanks. I got the tin off on one side, but the dr... Nov 19 2004, 02:07 PM BPGREER I got up under there, and made sure everything was... Nov 20 2004, 11:03 PM BPGREER Could a bad injector be causing all of these sympt... Nov 21 2004, 01:06 AM ChrisReale Dont listen to these guys, they're all wrong. ... Nov 21 2004, 01:09 AM redshift :lol: he's right! Had you goin!
M Nov 21 2004, 01:57 AM mike_the_man Yup, we're all doomed to eratic idling.
Hmmm,... Nov 22 2004, 04:13 PM BPGREER How do I test to see how much vacuum I'm pulli... Nov 23 2004, 05:53 PM mike_the_man To test vaccuum, you need a vaccuum gauge. I boug... Nov 24 2004, 11:50 AM Qarl http://www.funfilesandsmiles.com/smileys/2738.gif Nov 24 2004, 01:34 PM BPGREER Awesome, thanks again Mike. I'll have to go p... Nov 24 2004, 02:49 PM Jeffs9146 QUOTE
BPGREER Is it easy to test, or should I just buy a new one... Nov 24 2004, 06:01 PM BPGREER Just thought of something that may/maynot have any... Nov 24 2004, 06:14 PM mike_the_man The cold start injector shouldn't affect anyth... Nov 25 2004, 12:36 PM BPGREER That would make sense. I will have to try to find... Nov 25 2004, 02:15 PM mike_the_man Sorry, I couldn't find a pic of it, but if rem... Nov 25 2004, 02:24 PM BPGREER UPDATE-
It turned out to be a leaking injector. ... Dec 14 2004, 08:09 PM mike_the_man Way to go! :trophy: I knew you'd figure... Dec 14 2004, 09:11 PM
BPGREER Still plenty more to do, but at least it's run... Dec 15 2004, 12:22 PM  |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 23rd May 2024 - 03:02 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.