Scooter Posted August 9, 2003 Share Posted August 9, 2003 Just a FYI thread. Walked the mile or two to my car this morning after a heavy night out and it would turn over but not fire up. had a look around in the engine bay but i'm pretty much clueless really, so i phoned for a lift / tow home. Whilst waiting i kept fiddling to no avail until i released the pressure in the fuel tank then it started first turn:conf: Not sure why this worked but it may save someone else from the 'bollocks my cars fooked and i've gotta get home' feeling. Link to comment Share on other sites More sharing options...
Mad Ad Posted August 10, 2003 Share Posted August 10, 2003 Hmmm, it MAY be that you had a funny type of air or fuel lock in there but I haven't heard anything like that before! At least she's working! Link to comment Share on other sites More sharing options...
Soonto_HAS_soop Posted August 10, 2003 Share Posted August 10, 2003 When I fill my car up, it can be like a pressure release in the petrol tank. But mine hasn't not started because of it though. Ben.. Link to comment Share on other sites More sharing options...
Scooter Posted August 10, 2003 Author Share Posted August 10, 2003 Baffles me too really, but i must of turned it over +25 times on and off before releasing the pressure and trying again, so i'm pretty sure it wasn't coincidence. Fuel was low and the car was in direct sunlight and the vapor pressure was higher than i'd ever had on fill ups, so maybe this had an effect, i don't know Happy to say its started on the button since Link to comment Share on other sites More sharing options...
Scooter Posted August 12, 2003 Author Share Posted August 12, 2003 Oh dear shouldn't have been so confident, it wouldn't start again this morning. Seems to be a fueling issue, no signs between this time and the last time of any rough running problems. Must have fired up between 15 -20 times before now not starting again? I don't like intermittent prob's Anyone got any non starting ideas /checks. Car turns over fine just won't catch / fire? cheers Link to comment Share on other sites More sharing options...
Mad Ad Posted August 12, 2003 Share Posted August 12, 2003 Fuel filter clogged up? Was it hesitating under hard accelerating? Could be HT leads then. Or check spark plugs for pitting/burnt edges. That's about as much as I can give you. Orrrrr, could be that your flooding the engine so when cranking next time put the accelerator on the floor all the way then lift up really slowly while still cranking. See if that helps. Orrrr could be the other way and the cold choke is playing up. Give those all a try. Link to comment Share on other sites More sharing options...
Scooter Posted August 12, 2003 Author Share Posted August 12, 2003 Cheers for that Ad, while i've been at work its been getting seen to and there was a problem with the fuel pump relay, basically the fuel pump was not operating. Tis up an running at the moment so i'm told! but electrician guy isn't totally sure it won't happen again. Need a circuit diagram for the car / fuel system. A new thread me thinks! Link to comment Share on other sites More sharing options...
Scooter Posted August 12, 2003 Author Share Posted August 12, 2003 He was right to be cautious, cause it won't start again Link to comment Share on other sites More sharing options...
Mad Ad Posted August 13, 2003 Share Posted August 13, 2003 Sorry mate! Cant help you with diagrams! Link to comment Share on other sites More sharing options...
Ian C Posted August 13, 2003 Share Posted August 13, 2003 Try checking the resistance from the terminals on the fuel pump to the pins on the multiplug in the boot (the one that comes from the fuel pump relay). I had a duff connection on the wiring loom (well, two wires) between the pump and the pump cage. It behaved in the same way, the pump wouldn't actually spin. It's done it 3 times now, each time I've rebuilt the upper connector, the last time good and proper, but it's only ever stopped working after being parked up, never during driving. It was tricky to diagnose because the *voltage* was showing at the pump terminals and yet it wasn't spinning, and yet it would spin when hooked up to a 12v source. What I didn't realise then was to check the resistances across each junction point, as a big resistance takes all the current away, hence the pump not spinning. -Ian Link to comment Share on other sites More sharing options...
Scooter Posted August 13, 2003 Author Share Posted August 13, 2003 Cheers for that Ian, i'll pass this info onto my friendly auto electrician. Link to comment Share on other sites More sharing options...
400BHP Posted August 13, 2003 Share Posted August 13, 2003 Originally posted by Mad Ad Fuel filter clogged up? Was it hesitating under hard accelerating? Could be HT leads then. Or check spark plugs for pitting/burnt edges. That's about as much as I can give you. Orrrrr, could be that your flooding the engine so when cranking next time put the accelerator on the floor all the way then lift up really slowly while still cranking. See if that helps. Orrrr could be the other way and the cold choke is playing up. Give those all a try. Sorry to disagree but I believe Scooter has a TT which = no HT leads! also a fuel injected engine should never flood, the throttle being wide open shouldn't inject more fuel on cranking, you should never touch the throttle when cranking, least of all because high revs just after starting may decrease life of ya turbos. Scoot, take it to a garage and have the fuel system purge cleaned, I have had this done before, basically what happens is they remove the fuel pump fuse, and the flow and return from the tank, then run your car on a special 'cleaning fuel' which will clean the valves and the injectors and rest of the fuel system, then chage your filter (if not recently done) and check for fuel pump hesitancy, put an ammeter between the postive pump feed and the pump, then start and check the current draw. Link to comment Share on other sites More sharing options...
Scooter Posted August 13, 2003 Author Share Posted August 13, 2003 400, TT's sold now! you've gotta watch me i don't tend to keep them long! when it runs it runs sweet, and i'm pretty sure its an electrical gremlin, as with nothing more than a bit of probing, ooh er, it started and again ran fine, but hours later failed to fire. I'll store all this and any other info up and keep my fingers crossed that its all sorted on friday. Thanks again peeps Link to comment Share on other sites More sharing options...
Scooter Posted August 15, 2003 Author Share Posted August 15, 2003 Ok car is fine again! Turns out it was a problem with the CAT 1 alarm wiring to the fuel pump circuit. To help searchers i've included the links below repair manuals for TT and NA Fault code 78 diagnostics (NB nz site has how to obtain error codes and all error code meanings etc) Link to comment Share on other sites More sharing options...
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