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.

Need Some Help Understanding Timing

Old Oct 23, 2007 | 12:56 PM
  #1  
Cheetah's Avatar
Thread Starter
Senior Member
True Car Nut
 
Joined: Feb 2006
Posts: 2,896
Likes: 0
From: Somewhere different on the globe every month....
Cheetah is on a distinguished road
Default Need Some Help Understanding Timing

And how it works.

After reading Petes post: http://www.bonnevilleclub.com/forum/...r=asc&start=40, I am slightly confused.

Watching the Aeroforce, I see a ~ -24° idleing to cruising at 70 with the stock PCM. I have a reprogramed PCM from Boosty (thanks again Boost ) but I am leaving the stock in there to learn After reading what Todd and Boosty wrote, something ain't right. The best MPG'* that I see on the highway are 25-26, the O2 was replaced last winter and the car is well maintained.

I am assuming that the -24° is not helping the fuel economy?
Reply
Old Oct 23, 2007 | 01:03 PM
  #2  
BillBoost37's Avatar
DINOSAURUS BOOSTUS

Expert Gearhead
 
Joined: Mar 2005
Posts: 41,391
Likes: 30
From: Enfield, CT
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

Greg, Your timing tables are stock IIRC. 1997'* show timing as a negative number. Cruising at 24 degrees is quite normal. I have seen up around 30'* as a normal occurence.
Reply
Old Oct 23, 2007 | 01:08 PM
  #3  
bonnie94ssei's Avatar
Senior Member
Certified Car Nut
 
Joined: Oct 2002
Posts: 11,308
Likes: 2
bonnie94ssei is on a distinguished road
Default

I saw Bill'* for the first time and was wondering why he had negative numbers. lol

24* is good. 35* is pretty normal for me at 65mph. I saw 45* in the 94 on one trip.
Reply
Old Oct 23, 2007 | 01:16 PM
  #4  
Cheetah's Avatar
Thread Starter
Senior Member
True Car Nut
 
Joined: Feb 2006
Posts: 2,896
Likes: 0
From: Somewhere different on the globe every month....
Cheetah is on a distinguished road
Default

Boost, I have the stock PCM in the car at the moment.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
zigger21
GMC/Chevrolet Truck/SUV
16
Aug 6, 2012 07:28 PM
1970Elky
Chevrolet
4
Aug 8, 2011 08:56 PM
Daron97SSE
1992-1999
8
Feb 26, 2007 02:33 PM
2000SilverBullet
Lounge
7
Jul 20, 2005 03:34 PM
d151avid
1992-1999
2
Nov 10, 2002 12:13 AM


Thread Tools
Search this Thread

All times are GMT -4. The time now is 08:48 AM.