Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical chat

Reply
 
LinkBack Thread Tools Display Modes
Old 08-17-2014, 05:47 PM   #1
Registered User
 
jsceash's Avatar
 
Join Date: Aug 2009
Posts: 1,430
Garage
Engine quits

I was at the track this weekend and while running at about 6000 to 6500 RPM as the car is transsioning back to the opposite G load the engine seems to quit running. I turned the key off then back on and it starts like it never missed a beat. No code of any type on durametric.

Is this the fuel pump filter or the knock sensors. I can't find any info on this happening to anyone else.

__________________
2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
jsceash is offline   Reply With Quote
Old 08-17-2014, 07:42 PM   #2
Registered User
 
Nine8Six's Avatar
 
Join Date: Sep 2013
Location: Montreal, QC. (currently expat to Shanghai)
Posts: 3,216
Stupid question, if you disconnect a battery pole... will the boxster car still run off the alternator?

Battery rocking in its tray/loose pole?

Just a guess mate, I have no idea what would cause something like that. Pretty weird in fact
__________________
______________________________
'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
Nine8Six is offline   Reply With Quote
Old 08-17-2014, 10:49 PM   #3
Registered User
 
Steve Tinker's Avatar
 
Join Date: Dec 2008
Location: Queensland, Australia
Posts: 1,522
How much fuel did you have in the tank?
Sound like the fuel delivery got interrupted during the transition.....
Or could you have hit the rev limiter by mistake.
__________________
2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
Steve Tinker is offline   Reply With Quote
Old 08-18-2014, 04:45 AM   #4
Registered User
 
jsceash's Avatar
 
Join Date: Aug 2009
Posts: 1,430
Garage
Work performed on the car prior to this event.
1. Removed the power steering pump and replaced due to tapping sound from idle to about 2000 RPM.
2. Wevo front motor mount because of cracking another stock mount.
3. 997 split control arms on rear
4. 996 rear adjustable toe links
5. 4 wheel alignment

I don't enter track with less than a 1/2 tank of fuel
I run Track Data the blip shows up on the recorder at 6000 to 6500 rpm if the G load was at least 1 G load and reverses to .5 or higher to the opposite side. The first time the car would not pull and I went into a runoff area, after an entire straight. Turned the key off turned the key on Full power back to pit. I ran two programs of diagnostic. The fuel trims were all normal no codes. The next time as fast a I could reach the key and turn off to on I had power

Do Knock sensors cause a code or reduce power. This was one suggestion I got.
__________________
2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust

Last edited by jsceash; 08-18-2014 at 04:54 AM.
jsceash is offline   Reply With Quote
Old 08-18-2014, 05:35 AM   #5
Registered User
 
seningen's Avatar
 
Join Date: Jul 2008
Location: austin
Posts: 762
Do you have any lights/codes coming up?

I would check wiring harness. Possible something gets yanked around and
freaks out the computer.

Mike

Quote:
Originally Posted by jsceash View Post
Work performed on the car prior to this event.
1. Removed the power steering pump and replaced due to tapping sound from idle to about 2000 RPM.
2. Wevo front motor mount because of cracking another stock mount.
3. 997 split control arms on rear
4. 996 rear adjustable toe links
5. 4 wheel alignment

I don't enter track with less than a 1/2 tank of fuel
I run Track Data the blip shows up on the recorder at 6000 to 6500 rpm if the G load was at least 1 G load and reverses to .5 or higher to the opposite side. The first time the car would not pull and I went into a runoff area, after an entire straight. Turned the key off turned the key on Full power back to pit. I ran two programs of diagnostic. The fuel trims were all normal no codes. The next time as fast a I could reach the key and turn off to on I had power

Do Knock sensors cause a code or reduce power. This was one suggestion I got.
__________________
Drivers: '08 Cayenne Turbo, 96 993 Çab/Tip (wife's) & '92 964 Cab
Race Cars: '75 911 RSR Clone & '99 Spec Boxster
mike@lonestarrpm.com
seningen is offline   Reply With Quote
Old 08-18-2014, 08:46 AM   #6
Registered User
 
BYprodriver's Avatar
 
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,411
Garage
Knock sensors only retard the timing

Test fuel pressure. I mean with a gauge attached to the fuel rail. You already did the toughest test, on track at high rpm & it may have failed that test.
__________________
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 08-18-2014, 08:51 AM   #7
Registered User
 
jsceash's Avatar
 
Join Date: Aug 2009
Posts: 1,430
Garage
I can't remember seeing any dash lights until after switching the key off and back on. Dura metrics showed no code on computer. Dyno Scan another performance scanning tool that does support the Boxster 2000 to 2005 codes and diagnostic showed no code current or stored.

The first time really freaked me out I was thinking the engine blew no real noise no vibration. I was passing a flag station and no yellow came out so I wasn't dropping anything or smoking. I looked at the shifter and took it out of 4th and back in nothing. Clutched in with gas it didn't rev. I looked behind for smoke. I left the clutch back out and the engine spun with out vibration. I passed second flag station no flag include black or meatball still pull into the pass through area off line. I stopped turned off the ignition, turn on the ignition it started like nothing happened. All the normal lights came on then went out. I revved the motor several time it sounded perfect as before. Popped it into gear and drove to the pits. The next session after 5 laps the same place within 30 feet. I reached over turned off the ignition turned it back on and hit the gas. Off we went dropped maybe 5 MPH in the process.

The rest of the day I lifted about 10% before that transmission. Sunday I was hitting the area at about 10 mph faster so I just shifted 4th to 5th and kept in the throttle about a 1000 RPM drop.

Two other times in another left turn right turn situation the same thing happened.
__________________
2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
jsceash is offline   Reply With Quote
Old 08-18-2014, 09:12 AM   #8
Reebuck1
 
Join Date: May 2013
Location: Georgetown, SC
Posts: 210
Garage
Are all your grounds tight and corrosion free?
Reebuck1 is offline   Reply With Quote
Old 08-18-2014, 09:29 AM   #9
Registered User
 
jsceash's Avatar
 
Join Date: Aug 2009
Posts: 1,430
Garage
Quote:
Originally Posted by Reebuck1 View Post
Are all your grounds tight and corrosion free?
I yes they are all tight no corrosion any place in body. The car has always been garage kept and rarely drive in the wet. Checked all control module plugs were tight (latched) the first time this happened and looked at all the trunk grounds.
__________________
2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
jsceash is offline   Reply With Quote
Old 08-18-2014, 09:46 AM   #10
Registered User
 
steved0x's Avatar
 
Join Date: Dec 2012
Location: FL
Posts: 3,996
Does your RPM go to zero when you lose your power (even though the engine is still turning?) If so then Crank position sensor. When that fails you won't get any spark.
steved0x is offline   Reply With Quote
Old 08-18-2014, 10:33 AM   #11
Registered User
 
seningen's Avatar
 
Join Date: Jul 2008
Location: austin
Posts: 762
Quote:
Originally Posted by steved0x View Post
Does your RPM go to zero when you lose your power (even though the engine is still turning?) If so then Crank position sensor. When that fails you won't get any spark.
We had something similar on our 944 race car, but it didn't require a restart.
Engine would cut in and out. Tach would drop to 0 then wake back up,
rinse and repeat. Was a challenge to drive.

Turned out to be an overheating ECU.

Mike
__________________
Drivers: '08 Cayenne Turbo, 96 993 Çab/Tip (wife's) & '92 964 Cab
Race Cars: '75 911 RSR Clone & '99 Spec Boxster
mike@lonestarrpm.com
seningen is offline   Reply With Quote
Old 08-18-2014, 05:08 PM   #12
Registered User
 
jsceash's Avatar
 
Join Date: Aug 2009
Posts: 1,430
Garage
Quote:
Originally Posted by steved0x View Post
Does your RPM go to zero when you lose your power (even though the engine is still turning?) If so then Crank position sensor. When that fails you won't get any spark.
I started looking at the data recorder. The RPM just go flat and start to drop as I slow until I hit the clutch and turn off the key where it drops sharply then as the key goes back on the rpm raise again. The data recorded is tied to a common point for the Tach. So although I don't remember seeing it drop the data recorder would say it did not drop out.

__________________
2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
jsceash 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 11:06 AM.


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