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

LinkBack Thread Tools Display Modes
Old 05-03-2018, 03:22 PM   #1
Registered User
Join Date: Feb 2007
Location: Australia
Posts: 206
Cranks but won't fire

Jumped in the car this morning & it cranks fine but won't fire.

It's obviously electrical but not sure what the possibilities are.

Will start with fuses & go from there.

Any assistance would be greatly appreciated.


2000 2.7 Boxster
aussieboxy is offline   Reply With Quote
Old 05-03-2018, 04:55 PM   #2
Registered User
Spinnaker's Avatar
Join Date: Dec 2007
Location: Seattle
Posts: 733
Take off the gas (petrol?) cap and listen at the fill neck for a whirring sound when the ignition is turned on. If there is no sound, then the fuel pump is not working. Check the fuse first.
When the engine is cranking, does the tachometer show any revs? If not, then the crank position sensor is not working.
2000S Ocean Blue Metallic- 116K
3X Water Pump, Clear side markers, Crios Mod, Front engine mount, Flywheel, clutch, RMS, AOS, MAF, serpentine belt, power brake vacuum line, battery, 2X CV boots, Fuel filter, Oil filler tube, 3X ignition switch, 90K service, gas cap
Spinnaker is offline   Reply With Quote
Old 05-03-2018, 05:31 PM   #3
Registered User
Join Date: Feb 2016
Location: SE USA
Posts: 243
I had the same situation several months ago. Diagnose this methodically. Think spark, fuel and then air/electrical. If fuses check out and it's not the crank position sensor then start with spark. Easy to pull a coil pack and shove a grounded plug into it and crank the engine. Look for a nice blue spark.

Next pull the fuel pump relay and jumper it. It's another check to what Spinnaker said but with your head in the footwell, you should hear the pump turn on as soon as you jumper the relay. If the pump runs, you're probably getting fuel so Che k the relay for continuity and function. Energize it and see if it clicks (relays are making contact). If not, bad relay. Just because your fuel pump runs doesn't mean you are getting fuel (ask me how I know). Check fuel pressure. My problem turned out to be a stuck fuel pressure relay. Good luck...
Jgkram is offline   Reply With Quote
Old 05-04-2018, 06:05 PM   #4
Registered User
Join Date: Mar 2014
Location: Eastern NC
Posts: 644
CPS sends a tach signal. IIRC from when mine died - you should see a blip on tach if it is sending a signal. On the other hand - my original durametric worked only once and that was able to I’d the failed CPS.

"YouTube Certified in Various Specialties"
BFeller is offline   Reply With Quote

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 05:06 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