Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > Porsche 914 & 914-6 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Mar 1999
Location: Sacramento, CA
Posts: 124
rough running + misfiring

Please I need your input guys! I am having an intermitant misfire problem. The car runs fine when cold but as soon as the oil temp gauge starts rising (like 120 F) the idle drops really low and gets rough, it feels like it is only running on three cylinders and I can smell gas coming from the exhaust. When the engine revs it misfires and then even worse above three thousand rpms and the power gets flat. Once the oil temp gets to about 180 F the engine does not quite misfire as much and when the idle drops it seems like the computer catches it and brings it back up, but it hunts excessively. The engine does not run hotter than normal, 180 F to 200 F depending on outside temp. I found that my coil was leaking goo so I replaced it thinking that that might be the problem, it runs smoother but problem is still there. The ignition system is all new, coil, rotor, cap, pointless type ignition (I think that it is compufire? has little magnetic disc, works great), spark plugs, wires, everything. I have checked all connections, grounds, etc. I am now stumped, the only thing I can think of is that maybe my cylinder head temp senor has gone bad since it seems that my problem is effected by the temp of the engine.
Sorry to ramble on but I wanted to give you the background info. Thanks for your help.
Old 09-22-1999, 06:41 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
 
Join Date: Oct 1998
Location: Quilcene, WA, USA
Posts: 123
Engine hunting always makes me think about vacuume hose leaks so check for those. I also had a similar problem when I switched the two hoses on the vacuume advance on the distributer on my 75 L-jet.

I assume you have checked your timing after you changed everything out?

Another thing to check would be your cold start valve.

You didn't say what year / type FI you have, but it sounds like you are running too rich.
Old 09-23-1999, 09:34 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
Join Date: Sep 1998
Location: Brooklyn, NY US of A
Posts: 126
If you've got a 1.8 the flap box may be the culprit. If you backfire through the intake (?) you may have damaged the unit which will cause you to run either too rich or too lean. I'm not sure which one.
Try putting the points back on.

Steve M

[This message has been edited by Steve M (edited 09-23-1999).]
Old 09-23-1999, 10:12 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 11:17 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - 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.