1986 Carrera stops dead and restarts for no apparent reason

Asked by Jul 28, 2011 at 02:34 PM about the 1986 Porsche 911

Question type: Maintenance & Repair

My 911 (130,000 miles but well cared for) suddenly has decided to do the following:  turn itself off and on.  It does this about every 90 miles or so.  Does not matter how fast I'm going, what gear. It's as if the ignition is turned off.  The car then, through momentum, starts itself up again.  This is tolerable in 5th, but in 2nd, car jerks forward, and it's obviously bad for clutch.  Battery is new.  I have checked for corrosion on cables and grounds and sandpapered.  I have tape-rapped anything I see where tape is old.  The stoppage is not triggered by bumps, or heat of the engine or anything that I can find.  Any ideas on what's up would be very much appreciated.

3 Answers

4,485

This intermittent type of problem is hard to diagnose ( like chasing a ghost), but you are looking in the right direction. Loose connections, corrosion at the engine/transmission ground strap. Check the ground connection from the battery to the chassis and the ground connections from the engine/transmission to the chassis. I would check the connection to the ecu as well to see if there is any moisture intrusion that might cause corrosion. Sometimes corrosion is not evident until you pull the connectors apart and inspect them. Good luck

1,515

Also check the wiring behind the ignition barrel. Could be that at some point in its history somebody tried to hotwire the car and the repair is not perfect.

Check your DME Relay.

Your Answer

Add photo

Related Questions

911

Looking for a Used 911 in your area?

CarGurus has 4,545 nationwide 911 listings starting at $8,901.

ZIP:

Search Porsche 911 Questions

Porsche 911 Experts

#1 Michael Kane
Michael Kane
Reputation 940
#2 Andrew Dickens
Andrew Dickens
Reputation 490
#3 tntjobs
tntjobs
Reputation 470
View All

Related Models For Sale

Used Chevrolet Corvette
179 Great Deals out of 20,807 listings starting at $3,995
Used BMW M3
55 Great Deals out of 1,919 listings starting at $2,250
Used Mercedes-Benz SL-Class
82 Great Deals out of 3,306 listings starting at $2,988
Used BMW 3 Series
1,369 Great Deals out of 37,821 listings starting at $1,500
Used Ford Mustang
363 Great Deals out of 44,490 listings starting at $1,000

Used Cars For Sale

2017 Porsche 911 For Sale
4 Great Deals out of 1,232 listings starting at $89,900
2016 Porsche 911 For Sale
5 Great Deals out of 250 listings starting at $77,991
2015 Porsche 911 For Sale
11 Great Deals out of 338 listings starting at $67,900
2014 Porsche 911 For Sale
16 Great Deals out of 336 listings starting at $58,902
2013 Porsche 911 For Sale
11 Great Deals out of 163 listings starting at $51,902