Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Mis-Firing 951

Sylvain951
 Share

Recommended Posts

Sylvain951 Member

Sylvain951

Posted
Posted

hi guys, I'm having a severe mis-fire after driving the car on the street for a few hours. It is perfect till that point. I shut it down for a few minutes and it's fine for 10 minutes till it starts to cut out again.

this will get expensive.

any ideas?

wvicary Member

wvicary

Posted
Posted

You need to determine if it's the secondary ignition system at fault or the DME injector ciruit. Do you know which cylinder is at fault?

Sylvain951 Member

Sylvain951

Posted
  • Author
Posted

You need to determine if it's the secondary ignition system at fault or the DME injector ciruit. Do you know which cylinder is at fault?

It starts as a hesitation, then goes to bucking then it won't even pull itself on flat ground.

It feels like more than 1 cylinder when it progresses.

I let it cool for a few minutes and it fires right up on all 4 then the whole hesitation to bucking to it can't pull itself all over again.

The computer was relocated to under the glove box and now has a fan on it. Within the past 10 months they tried the crank position sensor, Rev sensor, and coolant sensor.

Sylvain951 Member

Sylvain951

Posted
  • Author
Posted

It starts as a hesitation, then goes to bucking then it won't even pull itself on flat ground.

It feels like more than 1 cylinder when it progresses.

I let it cool for a few minutes and it fires right up on all 4 then the whole hesitation to bucking to it can't pull itself all over again.

The computer was relocated to under the glove box and now has a fan on it. Within the past 10 months they tried the crank position sensor, Rev sensor, and coolant sensor.

wvicary Member

wvicary

Posted
Posted

Start with the basics like fuel pump pressure and volume. It could be many things including a faulty ground or plugged exhaust. If your garage is just throwing parts at it hoping to find the problem then it's time to find new garage.

Sylvain951 Member

Sylvain951

Posted
  • Author
Posted

Start with the basics like fuel pump pressure and volume. It could be many things including a faulty ground or plugged exhaust. If your garage is just throwing parts at it hoping to find the problem then it's time to find new garage.

Sylvain951 Member

Sylvain951

Posted
  • Author
Posted

I have a straight thru 3" Lindsey exhaust with no cat.

The car got a new wiring harness for the battery ($238 part).

It went to a dealer which did the sensors and a race/street shop for the ECU relocate, battery harness.

do you think it could be vapor lock?

S

wvicary Member

wvicary

Posted
Posted

I highly doubt it's vapour lock but you need to test the fuel pressure and pump volume both hot and cold engine.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.