Parts Catalog Accessories Catalog Tech Info Tech Forums
 
  Search our site:    
 Cart  | Project List | Order Status | Help    
  We salute a legendary member of the community.
Thank you for selflessly sharing your wisdom with us...
Go Back   Pelican Parts Technical BBS > 1- Porsche Technical Forums > Porsche 911 Technical Forum

Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Oct 2002
Location: va
Posts: 387
symptoms of running a car onold/bad gas?

My car has been sitting a whle and its spitting through the carbs and an occaisional cough from the exhaust. Just wondering if this could be the culprit. However, now that I think about it, it runs fine when I first start it up - about 30 secs to 1 min before it starts objecting.




thanks
Old 09-26-2005, 03:18 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #1 (permalink)
Wider is Better
 
wholberg's Avatar
 
Join Date: Jan 2005
Location: Apex, North Carolina
Posts: 1,056
Garage
Bad gas, as in old, causes symptoms like knocking and reduced power from reduced octane.

Water in gas might cause the symptoms you describe, but so could carbs with a bunch of internal varnish and crap from sitting. I would start with the typical tune up stuff, cap, rotor, etc., and if that does not fix it, clean the carbs.
__________________
Wider is Better
Old 09-26-2005, 03:40 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #2 (permalink)
Warren Hall Student
 
Bobboloo's Avatar
 
Join Date: Aug 2000
Location: Los Angeles Ca.USA
Posts: 3,913
Garage
Wouldn't hurt to change the fuel filter and add some gasoline stabilizer.
__________________
Bobby

Warren Hall 1950 - 2008
_____"Early_S_Man"_____
Old 09-27-2005, 12:03 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #3 (permalink)
Registered User
 
Navaros911's Avatar
 
Join Date: Feb 2005
Location: Bahrain
Posts: 370
911-m5: How long is a while?

How long would it take for gas to go bad? 3 months, 6 months, a year?

Mine has not moved for 2 months (slow suspension project - for various reasons - and a bunch of 'while I'm in there stuff') and wonder if that is a problem.
__________________
'94 964 - Celebration 30 Jahre edition
'06 997 - arctic silver with cocoa interior - sold
'77 RoW 911 - black and still sexy - sold and I miss her
'05 Audi A3 Sportback 1.9TDI (not a bad daily driver) - gone
Old 09-27-2005, 12:33 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #4 (permalink)
durn for'ner
 
livi's Avatar
 
Join Date: Feb 2005
Location: South of Sweden
Posts: 15,182
As Bobboloo mentioned - fuel filter.

At least a few earlier threads have described there could be a connection with symptoms like this - noticeable first after running for a short while.

Experts aboard - am I learning anything yet ?
__________________
Markus
Resident Fluffer

Carrera '85
Old 09-27-2005, 01:08 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #5 (permalink)
Wider is Better
 
wholberg's Avatar
 
Join Date: Jan 2005
Location: Apex, North Carolina
Posts: 1,056
Garage
Quote:
Originally posted by Navaros911
911-m5: How long is a while?

How long would it take for gas to go bad? 3 months, 6 months, a year?

Without stabilizer, gas can go bad in 4-6 months, as in loss of octane, not necessarily condensation in the tank. Carbureters usually take a little longer to gum up, unless the car is not run very much.

Fuel stabilizer slows the loss of octane, and prevents water from pooling in the bottom of the gas tank, causing rust.
__________________
Wider is Better
Old 09-27-2005, 02:04 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #6 (permalink)
 
Now Available for Ordering:   101 Projects For Your BMW 3 Series 1982-2000  [more info]
Registered User
 
murphyslaw1978's Avatar
 
Join Date: Sep 2006
Location: Chicago, IL
Posts: 37
Mr. Wholberg - my '88 Carrera was sputtering and missing at 1/4 tank. I filled up and the problem disappeared. I don't think I was out of gas (filled up 18 gallons and tank is 22.5 gallons), but I do think I have some water in there. Which product - specifially - do you recommend to put in the tank and run it through? Are they all safe to use or just STAY-BIL?
__________________
1988 911 Carrera Targa
Old 09-05-2006, 09:45 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #7 (permalink)
Registered User
 
petrolblue83911's Avatar
 
Join Date: Jul 2005
Location: Boston, Mass
Posts: 836
Look at the fuel filter for sure, sounds like the classic symptoms of the fuel lines dragging crap up from the tank and lines and into the filter. When starting the car at first, the crap has settled so it takes a few seconds/minutes for it to come back up. If you find your filter badly clogged you may need to either pull the fuel line and pump the tank out into a conainer to rid the lines of the crap, or -worst case, pull the tank and clean it out.
Old 09-05-2006, 09:55 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #8 (permalink)
Registered User
 
murphyslaw1978's Avatar
 
Join Date: Sep 2006
Location: Chicago, IL
Posts: 37
I actually did replace the air and fuel filters before my trip. I ran the car afterwards and it ran fine. It only seems to be an issue when I hit 1/4 tank. The old fuel filter didn't look clogged or too dirty.
__________________
1988 911 Carrera Targa
Old 09-05-2006, 10:18 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #9 (permalink)
Wider is Better
 
wholberg's Avatar
 
Join Date: Jan 2005
Location: Apex, North Carolina
Posts: 1,056
Garage
Quote:
Originally posted by murphyslaw1978
Mr. Wholberg - my '88 Carrera was sputtering and missing at 1/4 tank. I filled up and the problem disappeared. I don't think I was out of gas (filled up 18 gallons and tank is 22.5 gallons), but I do think I have some water in there. Which product - specifially - do you recommend to put in the tank and run it through? Are they all safe to use or just STAY-BIL?
I had an old Camaro that exhibited identical symptoms, and the cure was the same, new gas diluted the old gas and the car ran fine.

If you think you have water in the tank, add some Heet, or whatever the auto parts stores sell for removing water from the tank. The kicker is that it might be difficult to find in the summer. Water removers are normally either methanol of isopropanol, if you have access to either one of those in pure form, about a pint in a tank of gas should work fine.
__________________
Wider is Better
Old 09-05-2006, 05:09 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #10 (permalink)
Old 09-05-2006, 05:09 PM
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 06:06 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.