Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Reply
 
LinkBack Thread Tools Display Modes
Old 05-22-2020, 12:33 PM   #1
Registered User
 
Join Date: May 2020
Location: Kentucky
Posts: 3
aos failure now car cranks once then nothing

today after the car wash my 98 boxster gives me a fit. tons of white smoke out the back and loss of power. i know that it has never been over heated and just recently serviced so im really leaning towards aos failure. now the car will only crank about a 1/4 turn then nothing almost like the starter is stuck? trying to figure out what i should look into first thanks in advanced for all the help.

kyporsche is offline   Reply With Quote
Old 05-22-2020, 01:24 PM   #2
1998 Boxster Silver/Red
 
Join Date: Sep 2017
Location: 92262
Posts: 2,057
I don't believe the wash had anything to do with it... unless you were spraying copious amount of water into the intake. My first guess is that your AOS went kaput. The first thing I would do is remove the tope AOS hose... give it an examination... see if it has a LOT of oil in it. A little is ok... a lot... I'd then pull the throttle body and see if it isn't flooded with oil. That may explain the no-start issue. Worst case sceanrio... you sucked a bunch of oil into the engine... and that'll require correction.

Do some searches on "white smoke 986 Boxster"... "AOS failure 986 Boxster"... you'll find of lots of information.

Keep us posted. You'll get through the hiccup.
__________________
1998 Porsche Boxster
1986 BMW 325es
2012 Ford Edge Sport

"Ignore the guilt, and take your turn"
Starter986 is offline   Reply With Quote
Old 05-22-2020, 02:31 PM   #3
Registered User
 
Join Date: Mar 2014
Location: Eastern NC
Posts: 639
Garage
Be careful about turning over a motor thar could have cylinders full of liquids. If that is a conrn, remove the spark plugs and turn the motor over manually.
__________________
"YouTube Certified in Various Specialties"
BFeller is offline   Reply With Quote
Old 05-22-2020, 02:58 PM   #4
Registered User
 
Join Date: Dec 2009
Location: Orange County, CA
Posts: 1,434
Quote:
Originally Posted by BFeller View Post
Be careful about turning over a motor thar could have cylinders full of liquids. If that is a conrn, remove the spark plugs and turn the motor over manually.
After removing the spark plugs, you can safely crank the engine using the starter.
Gilles is offline   Reply With Quote
Old 05-23-2020, 05:48 AM   #5
Registered User
 
Join Date: May 2020
Location: Kentucky
Posts: 3
[QUOTE=Starter986;617504]I don't believe the wash had anything to do with it... unless you were spraying copious amount of water into the intake. My first guess is that your AOS went kaput. The first thing I would do is remove the tope AOS hose... give it an examination... see if it has a LOT of oil in it. A little is ok... a lot... I'd then pull the throttle body and see if it isn't flooded with oil. That may explain the no-start issue. Worst case sceanrio... you sucked a bunch of oil into the engine... and that'll require correction.

Do some searches on "white smoke 986 Boxster"... "AOS failure 986 Boxster"... you'll find of lots of information.

so the mechanic at my dealership got the car to start and now it sounds like the lifters are also toast, he quickly shut it down and we are going to move forward with examining the plugs and changing the aos
kyporsche is offline   Reply With Quote
Old 05-23-2020, 11:27 AM   #7
1998 Boxster Silver/Red
 
Join Date: Sep 2017
Location: 92262
Posts: 2,057
[QUOTE=kyporsche;617551]
Quote:
Originally Posted by Starter986 View Post
I don't believe the wash had anything to do with it... unless you were spraying copious amount of water into the intake. My first guess is that your AOS went kaput. The first thing I would do is remove the tope AOS hose... give it an examination... see if it has a LOT of oil in it. A little is ok... a lot... I'd then pull the throttle body and see if it isn't flooded with oil. That may explain the no-start issue. Worst case sceanrio... you sucked a bunch of oil into the engine... and that'll require correction.

Do some searches on "white smoke 986 Boxster"... "AOS failure 986 Boxster"... you'll find of lots of information.

so the mechanic at my dealership got the car to start and now it sounds like the lifters are also toast, he quickly shut it down and we are going to move forward with examining the plugs and changing the aos

Man... I hope it's something simple like the AOS. Lifters toast? Keep us posted... we like closure.

Best wishes. Se you around.
__________________
1998 Porsche Boxster
1986 BMW 325es
2012 Ford Edge Sport

"Ignore the guilt, and take your turn"
Starter986 is offline   Reply With Quote
Old 05-23-2020, 10:52 PM   #8
Registered User
 
traveno's Avatar
 
Join Date: Aug 2019
Location: Oregon
Posts: 73
Garage
Quote:
Originally Posted by Gilles View Post
After removing the spark plugs, you can safely crank the engine using the starter.
While true, I'd recommend turning it over my hand first. Unless you want liquids shooting out the spark plug holes and spraying onto stuff you probably don't want it on
__________________
2001 Tiptronic S in Speed Yellow, currently ~65k miles.
Currently doing an IMS bearing and RMS replacement.
Also replacing the water pump, thermostat, venturi tube (I broke it), serpentine belt, washer pumps, AOS, spark plugs, oils, fluids, filters, etc, etc.
traveno is offline   Reply With Quote
Old 05-24-2020, 08:33 AM   #9
Registered User
 
BYprodriver's Avatar
 
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,551
Garage
Quote:
Originally Posted by Gilles View Post
After removing the spark plugs, you can safely crank the engine using the starter.
And you can inspect the spark plugs at the same time for oil etc.
__________________
Jerk that is constantly criticzing new forum members and overly advertising my rebuilt engine for sale for a highly inflating price along with other miscellaneous parts accumulated over my 20 years of ownership.
BYprodriver is offline   Reply With Quote
Old 05-24-2020, 10:27 AM   #10
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,665
Quote:
Originally Posted by kyporsche View Post
so the mechanic at my dealership got the car to start and now it sounds like the lifters are also toast, he quickly shut it down and we are going to move forward with examining the plugs and changing the aos
Wow. I'd really like to know a lot more about what's going on...
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
thstone is offline   Reply With Quote
Old 05-24-2020, 11:41 AM   #11
Registered User
 
911monty's Avatar
 
Join Date: Oct 2014
Location: California Central Coast
Posts: 1,334
Garage
I'd certainly recommend at minimum a compression test before I changed the AOS.
911monty is offline   Reply With Quote
Old 05-24-2020, 11:46 AM   #12
Who's askin'?
 
maytag's Avatar
 
Join Date: Mar 2018
Location: Utah
Posts: 2,214
Quote:
Originally Posted by kyporsche View Post

so the mechanic at my dealership got the car to start and now it sounds like the lifters are also toast, he quickly shut it down and we are going to move forward with examining the plugs and changing the aos
Lifter failure?
That's odd, to say the least. Sometimes "a lifter" will fail. But for multiple lifters to fail simultaneously? That's odd. Really odd.

So in my mind I'm considering all of the scenarios I can think of that would result in that diagnosis.
If multiple lifters are bad, this suggests an oil pressure problem. So what might cause white smoke AND oil pressure issues? I'm struggling to come up with something plausible.

What I think IS unfortunately plausible, is that your mechanic suspects lifter failure because he did a compression check. However, the same symptoms could point to broken-bits, which is more consistent with the rest of your symptoms. ie: aos fails, motor ingests liquid oil and hydra-locks. This creates the "will only turn a 1/4 turn", assumption, and that 1/4 turn was enough to break hard parts.

I dunno.... I'm reaching here.

I sure want to know more about what he finds.

It's POSSIBLE that the white smoke and now 1/4 turn only are unrelated. ?

Sent from my SM-G970U using Tapatalk


Last edited by maytag; 05-24-2020 at 07:37 PM.
maytag is offline   Reply With Quote
Reply


Thread Tools
Display Modes

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 05:03 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Content Relevant URLs 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