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Porsche 928 Problems

The car starts does not idle or rev up,

Posted by Anonymous on


6 Suggested Answers

  • 2 Answers

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Posted on Jan 02, 2017

  • 1010 Answers


go to your dealer.

Posted on Jun 18, 2008

  • 1861 Answers

SOURCE: porsche 928

Pull the fuse panel cover in front of the passenger footwell; check for corroded or blown fuses.

Posted on Sep 17, 2008

  • 15 Answers

SOURCE: Adding automatic transmission fluid to Porsche 928 S4

Mine is an 88 cant imagine its different, thereis a plastic tank on the rhs of the trans that has a screw off lid, you will need the car on stands or a hoist level and with the oil at opperating temp you will also need a bottle pump or some type of plunger to fill it the engine must be running and add the fluid slowly allow time for it to be taken into the trans repeat until at the mark and stays there

Posted on Sep 19, 2009

  • 15 Answers

SOURCE: 1986 porsche 928 intake removal and replacement of sparkplugs.

You dont need to take off the intake manifold but the cold air intakes these unclip grab the convaluted tubing and pull it straight back out of the aircleaner then lift it up and un clip the bottom then pullit out of the intake snorkle

Posted on Sep 19, 2009

  • 1 Answer


I have the very same problem - Were you able to solve it ?

I've cleaned the Idle control valve several times and it seems to help overall but definitely not the cause ! - I think it might be the Coolant temp. sensor - have you tried changing that ?, did it work ?

Thanks mate - please let me know at if you find a solution

Posted on Sep 23, 2009

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'83 Porsche 928 Bosche K-Jetronic F.I.control pressure too high, 69 psi. should be 35-40 psi. how do I adjust warm up regulator high control pressure

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should be located in the passenger side footwell though being that your one right hand drive may be in the drivers footwell behind the side plastic should look something like this

Jan 15, 2014 | Cars & Trucks

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Porsche 928

Pull the fuse panel cover in front of the passenger footwell; check for corroded or blown fuses.

Sep 16, 2008 | 1984 Porsche 928

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The car dies around 45mph?

Clean the air filters out. Not sure if it will help. 928 gts owner

Aug 06, 2008 | 1986 Porsche 928

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88 928 will start but then it will stall or the tach will bounce the car will rev up and down by it self. can take off a3k rpm then it is fine but may stall out at next stop

It could be the MAF (mass air flow meter), or the ISV (idle stablizer valve. The problem with 928s are all the sensors, meters, and valves that can create the same symptoms when they fail. The Temp II Sensor can create the same idle problems when the car is cold. If you're more of a DIYer, try It's a great community of Porsche owners. If you go the the 928 forum, you can search threads or just post your problem. The members there are very knowledgeable and helpful.

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