Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Geo > Nova | Prizm | Spectrum | Sprint
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools Search this Thread
Old 04-08-2018, 05:10 PM   #1
brcidd
AF Enthusiast
 
brcidd's Avatar
 
Join Date: Jul 2005
Location: troy, Ohio
Posts: 2,208
Thanks: 2
Thanked 145 Times in 143 Posts
95 Geo Prizm poor gas mileage fixed!

Put a used tranny in this one- drove it 200 miles- but was getting low idle and absolutely pitiful gas mileage- about 7 mpg - 71 miles on a tank of gas!! I even went so far as to set up the idle stop to get it to idle faster. It was running really rich- would blow out black smoke and blacken the spark plugs bad.

Finally found the issue where the vacuum hose was pulled off the MAP sensor on the firewall near passenger side. Plugged in the hose while running, idle increased about 400 RPM, and now I had to set it back to where it was before the tranny change. What was amazing throughout this entire ordeal was that there was never a service engine light!! It was not so much that there was a vacuum leak, as that the ECM never was able to properly read engine vacuum and adjust injector pulses accordingly....Live and learn and pass it on...
__________________
Automotive A/C Engineer with:
'99 IH 4700 Toy Hauler
(2) '95 GEO Prizms both maroon
'99 GMC Yukon
'95 Chev 3500, 454 Dually Crew Cab- 145k miles-
Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone-
'92 Chevy Lumina Van 3.8L 264k
'86 GMC S-15 - 2.8L 154k
'87 Buick Park Ave . 187k
'86 Buick Park Ave 3.8L 199k miles- gone
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles-

Last edited by brcidd; 04-08-2018 at 08:02 PM.
brcidd is online now   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD


Bookmarks
Go Back   Automotive Forums .com Car Chat > Geo > Nova | Prizm | Spectrum | Sprint

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



All times are GMT -5. The time now is 03:43 AM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts