Question about 1986 Porsche 944
Drove my 944 around last night and this morning (not used often). Stopped at several places (engine off and back on again). Stopped at petrol station and left lights on. When tried to start again there was nothing. Not even trying to turn over. When we tried to jump start the engine turned, fired briefly, then cut out. Now all we can do it turn over the engine but it will not start.
I am thinking i have two issues. 1) alternator not charging up the battery properly, hence no power to turn the engine because i had left lights on, even only briefly.
2) Petrol pump problem. Do you think my pump is now not pumping fuel throughm, hence not starting.
Any of this sound similar to a problem someone else has had. I had a simmilar problem a while back, and changed the Fuel Pump Relay, however this didnt make any difference, and then one day it just decided to work again.
Please help as because its unreliable i dont want to use it (and cant at the moment)
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Posted on Jan 02, 2017
This is not a known solution, but in general these cars suffer from voltage and current drops on electrical connections due to corrosion on contact surfaces. I cannot remember the number of times I have read about electrical problems on these cars, and the problem was usually solved by cleaning the electrical contacts or replacing a relay going bad (BTW, this car does use a lot of relays however I doubt there is one in the fuel gauge circuit).
Also, I have a spare gauge cluster for the 944 and when I look at it, there are some resistors on the "printed circuit" piece. If one of those were to lose tolerance, or burn open, it would no doubt have an effect on the accuracy of the circuit. I would check out that circuitry and test the resistor values as a last resort -- it is not likely the gauge itself if it is working at all. However, before doing that I would clean the electrical contacts thoroughly. I have not tried to gain access to the wiring harnesses for the gauge cluster while it is in the car, but I doubt it is possible. So, if you have exhausted all other ideas go to the Clark's Garage site for instructions on how to remove the dash, and just follow the portion that applies to removing the gauge cluster. Go to the local electronics hobbyist store, or online, and obtain a good contact cleaner and clean all of the electrical contacts while also looking for loose or broken wires. NOTE: Be careful and gentle dealing with the plastic connectors on these cars as they tend to be brittle and little tabs break off easily if man-handled. Go slow, be in the right frame of mind and use good lighting so that you can see what you are doing.
Posted on Mar 29, 2009
SOURCE: no power with fuel pump
firtt make sure the pump is not clogged up , then if u remove the relay and put a piece of wire across 2 off the terminals to make it run constant to see if pump ump is working , or u could wire the pump up to test
Posted on Aug 13, 2009
SOURCE: PORSCHE 944 Starting issue:
Your car has a clutch switch if it's a standard and a park neutral switch if it's a automatic. The automatic it's in the console with a rod connected to the shifter, Knock the shifter to the side too hard, ( jump in the car and push the shifter sideways) and the rod can pop out. With the cover off just pop it back in. On the standard shift the switch is on the clutch pedal and you can break the wire or the plug or the switch it's self with your big feet. The carpet can bulg up under the pedal not letting you pust it down all the way. It in doubt about either switch there's just the two wires cross them and it'll start no matter ( just be careful as the reson for the switch is to keep you out of a wreak) Lets say your still out to passture and the switch is good Turn to start and the test light lights at both sides of the switch the wire at the starter ( the one small wire) comes hot in the startt position and you add power at this wire and theirs still no reaction, with this wire hot ( jumper wire , someone holding the key to start) rap on the starter with a hammer, I didn't say nail it) still no good and the big wire from the battery is hot ( battery cable going to the starter is clean and good, then the starter is bad. Have the parts store test it before you buy the new one as if it's good you missed somewher in the story I just told. 10 volts or more at the starter with the key heald at start and it'll start if it's going to/
Posted on Sep 27, 2010
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