1979-1993 & 94 Conv [Subscribe to Daily Digest] |
Thanks all for your suggestions. Damn I hate intermittent symptoms!
Here's my reply to suggestions offered and and questions proffered to date (many thanks to all who took the time). First, sure, it was hot, somewhere north of 90 degrees F, but at least the temp gauge said all was well, pointing below the horizon to 4:00 or 3:30 at highest. I understand that not all components are equally cooled under excessive ambient heat conditions, but (unfortunately) ity's been hotter in these parts in weeks prior and I never noticed the hiccups before. Second, no evident tach bounce, but that may simply be because I'm watching the road rather than the tach. Really, the pauses are so slight in duration, I wonder whether my eyes could shift from the road to the tach quickly enough to see the dip.
One additional clue I have garnered by obsessing over this issue-- it seems to happen most often (or maybe most noticeably?) at constant speed. That is, I have not felt a miss during acceleration or even slowdown/downshifts, it seems to happen only after I've been cruising at hwy speed-- 65 on interstate, 55 on state hwys, but I fear this could be a case of confirmation bias since momentary 'drops' at constant speed could be more apparent than a slight hesitation or miss on acceleration.
In any case, and not that it's a competition, but I'm leaning towards the coil or CP (Hall) sensor as culprit, but will dig deeper only after I check the grounding lugs. In reply to the couple of inquiries/comments mentioning a glowing CEL, I did, in fact, notice it coming on intermittently and very briefly-- and for no apparent reason-- during recent drives but I haven't yet pulled the codes (which I have found to be almost always a useless exercise in the few times I have gone to the trouble; O2 sensor? Really? Gas fuel mixture-- what am I supposed to do with that nugget of info?).
My worst case scenario is crank position (Hall) sensor which, as noted in replies preceding, is on the firewall side of the motor and seems to me a challenge to replace given limited accessibility and need to break the nuts on the crank pulley to remove or replace. Agreed that it would be an opportune time to do a bit of preventative repairs, but I figure it's a 6-12 pack of a job and a full weekend or longer at the rate I work to figure things out and "git 'er done".
I'm going out to check the grounds now. I would be rather ecstatic to find, say, loose connections near the thermostat off of the APC harness, I'll keep you posted.
Scott
posted by 68.187.92...
, Sun, 15 Jul 2012 09:31:17
, Sun, 15 Jul 2012 18:15:54, Mon, 16 Jul 2012 20:44:51, Tue, 17 Jul 2012 03:58:27
, Wed, 18 Jul 2012 22:12:17
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
 |
 |
 |
 |
 |
