Porsche

Porsche Repair Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Porsche

996 cranks, but won't start...I tried a spare key that's…

Customer Question
996 cranks, but won't...

996 cranks, but won't start...I tried a spare key that's new/never used, still won't start. it turns over for as long as key is engaged, but won't stay started...

Mechanic's Assistant: Can you turn the steering wheel at all? And what about the key? Is it worn or damaged?

Yes, I can turn the steering wheel as normal..I had to have a new key made 4 years ago after wife lost my spare. I keep that "new" unused key in my desk drawer, it's never used, basically brand new.

Mechanic's Assistant: What is the model/year of your Porsche?

2001 996 Carrera 2

Mechanic's Assistant: Are you fixing your Carrera yourself? What have you tried so far?

It just happened 2 hours ago. I drove it to the dog park, then when I was ready to come home, it wouldn't start...No, not trying to fix on my own.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Oh, I have a mechanic, if it comes that...Rennen performance in Tampa...

Submitted: 5 months ago.Category: Porsche
Show More
Show Less
Ask Your Own Porsche Question
Customer reply replied 5 months ago
Due to hurricane here in Tampa, premium octane fuel wasn't available, and 2 days ago, I filled up with low octane gas...could that be the problem? battery seems fine/engine cranks when I turn the key, but it just won't fully start.
Customer reply replied 5 months ago
this has never happened before, I've had the car since 2010.
Answered in 3 hours by:
9/15/2017
Porsche Mechanic: Matt, Engineer - BEng Hons replied 5 months ago
Matt
Matt, Engineer - BEng Hons
Category: Porsche
Satisfied Customers: 22,618
Experience: Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
Verified

Hello

I doubt the low octane gas is the reason why it won't start

1st check for spark by removing one of the spark plugs and plug it back into its lead and rest it on the metal of the engine ( DO NOT hold it on place by hand) then have your assistant turn the engine over whilst you watch the plug. It should give a fat blue spark at regular intervals.

If not then check that there's power to the coil pack (at the other end of the plug lead) using a meter. If there’s 12V at the pack but no spark then check the ECU power supply (fuse and relay) and also the connections to the crankshaft speed sensor.

If you can't hear anything check the ECU power is present by measuring voltage at the fusebox and on its relay socket if OK then check the connections to the crank speed sensor and consider replacing this sensor if the wiring / connections look OK

If the car will start using a squirt of quick/ easi start into the intake then this confirms the problem is lack of fuel

Also its worth checking that the electric pump that feeds the injectors is working correctly, it should run for a few seconds then switch off when you first turn the ignition on. If you remove the filler cap to the fuel tank and listen inside while your assistant flicks the ignition you should hear it clearly
If the connections to this are corroded or damaged then the pump could stop at any time. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse, ideally measure the voltage at the pump and check its getting 12V.
You should be getting around 3 bar measured at the injector rail check to see if the plugs are getting wet indicating fuel is flowing – if not and the injectors are opening then there’s a problem with the pump or the filter or even the pressure regulator

Ask Your Own Porsche Question
Porsche Mechanic: Matt, Engineer - BEng Hons replied 4 months ago

Hi
do you still need help?
Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you

Ask Your Own Porsche Question
Ask Matt Your Own Question
Matt
Matt
Matt, Engineer - BEng Hons
Category: Porsche
Satisfied Customers: 22,618
22,618 Satisfied Customers
Experience: Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing

Matt is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

Meet the Experts:

Sebastian Vizcarra

Sebastian Vizcarra

Porsche Meister Tech

350 satisfied customers

Porsche Factory Certified Master Technician

Matt

Matt

Engineer - BEng Hons

22,618 satisfied customers

Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing

PorscheDoc

PorscheDoc

Independent Porsche shop owner

355 satisfied customers

20 years of experience working with Porsche. Independent European shop owner and technician.

Stephen D

Stephen D

Technician

67 satisfied customers

5+ years managing an auto repair shop. Developed a wealth of Porsche knowledge over many model years.

Mike S.

Mike S.

ASE Certified Technician

59 satisfied customers

Porsche mechanic.

Mike Kelly

Mike Kelly

Porsche Mechanic

51 satisfied customers

17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.

Don - Mo Lurch

Don - Mo Lurch

Mechanic

32 satisfied customers

Line Mechanic, Mobile Electronics, Aftermarket Equipment

< Previous | Next >

Related Porsche Questions
What causes my 2001 Porsche Boxster to surge and backfire in
what causes my 2001 Porsche Boxster to surge and backfire in idle mode … read more
PorscheDoc
PorscheDoc
Independent Porsche shop owner
Bachelor's Degree
355 satisfied customers
2018 Porsche Cayenne PCM freezes on my but 10 - 15 min later
2018 Porsche Cayenne PCM freezes on my but 10 - 15 min later it works. The dealer rebooted the system but still happening. … read more
Lou P. master tech
Lou P. master tech
Mercedes Benz master tech
Bachelor's Degree
649 satisfied customers
I have a 2012 Cayenne and the passenger side tail light will
I have a 2012 Cayenne and the passenger side tail light will work fine with engine not running... as soon as I start engine it goes off and does not work. The side marker works but no break, riding or… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I want to know what year 911 to buy or not buy in the 25k to
I want to know what year 911 to buy or not buy in the 25k to 30k range … read more
Matt
Matt
Engineer - BEng Hons
22,618 satisfied customers
Only to Chad Farhat - Porsche Mechanic Chad, how have you
Only to Chad Farhat - Porsche MechanicHi Chad, how have you been?I have not touched my car with the ignition lock cylinder problem (if you remember, i had tried to force the key to turn on an icey day… read more
Lou P. master tech
Lou P. master tech
Mercedes Benz master tech
Bachelor's Degree
649 satisfied customers
Was replacing radio while engine was running with windows
was replacing radio while engine was running with windows up, the vehicle engine shut-off. was idling for close to 45 minutes … read more
Bart Zorchets
Bart Zorchets
1 satisfied customers
I have a 2004 Cayenne 6 cylinder and there is a whining
I have a 2004 Cayenne 6 cylinder and there is a whining sound that is somewhat speed related in that it gradually increases in pitch as the speed increases but not directly related to wheel speed. I t… read more
Bart Zorchets
Bart Zorchets
1 satisfied customers
Running a little ruff lack of power at times check engine
running a little ruff lack of power at times check engine light on … read more
Danny
Danny
Owner, lead mechanic
High School or GED
3,963 satisfied customers
2011 Porsche Cayenne - rear passenger window on driver side
2011 Porsche Cayenne - rear passenger window on driver side wont operate. window shade doesn't operate as well. all other windowws operate fine … read more
Jagmaster
Jagmaster
Bachelor's Degree
346 satisfied customers
Pearl. I've been out of the country, and my '97 993 cab has
Hi, Pearl. I've been out of the country, and my '97 993 cab has sat on a trickle charge in my garage for probably 2 months. I tried to unlock the door with the key fob today, but nothing happened. So … read more
Jake
Jake
Vocational, Technical or Trade Scho
295 satisfied customers
Do you recommend the 2014 Panamera 4S, I live in the
Do you recommend the 2014 Panamera 4S, I live in the Northeast ? … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
2006 Cayenne Turbo S...won't recognize driver's door is
2006 Cayenne Turbo S...won't recognize driver's door is closed. Error message about driver's door being open w/continuous chime … read more
Bart Zorchets
Bart Zorchets
1 satisfied customers
Porsche panamera rear spoiler is locked upright and the
porsche panamera rear spoiler is locked upright and the warning message is coming on. I would like to fix it or at least disable the warning message and leave it up?… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
I plan to buy a used Panamera, Porsche. 2011 around 100K
I plan to buy a used Panamera, Porsche. 2011 around 100K miles. … read more
PorscheDoc
PorscheDoc
Independent Porsche shop owner
Bachelor's Degree
355 satisfied customers
I need to change out the battery for a new one. I don't have
i need to change out the battery for a new one. I don't have the radio code when i put the new battery in. … read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
Third garage door opener does not work. other installed
third garage door opener does not work. other installed fine. What is appenning? … read more
Lou P. master tech
Lou P. master tech
Mercedes Benz master tech
Bachelor's Degree
649 satisfied customers
OK--so I recently replaced the battery in my 1998 Boxster.
OK--so I recently replaced the battery in my 1998 Boxster. .I'm just getting around to putting the code in the radio and can't find the code card. question 1 is are you able to provide the code? SN fo… read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
2009 porsche boxter code p1699 Battery OK, alternator OK,
2009 porsche boxter code p1699 Battery OK, alternator OK, charging 14.2 V. Cleared the code coming back in couple seconds… read more
Jake
Jake
Vocational, Technical or Trade Scho
295 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x