your local HSV dealer
Tech 1 ?
Hey guys i just got my car back from holden they were trying to fix my starting problems, the problem i had was that my car would need to be cranked over for about 15 seconds first thing in the morning for it to start once it started it was good for the rest of the day. Well this went on for about 5 months i had 4 diffrent guys trying to fix it i got a new fuel puimp fuel lines the lot that didnt fix it so i sent it to holden,
Now holden did there computer test and told me it was my fuel regulator so they fixed it i went to pick up my car and sure ebough the bugger didnt start i still had to crank it over 15 secs so i left it with them another 2 days i got my car back tonight but they never got a chance to get a tech 1 done on it cause there tech 1 equpment was stuffed.
My first question is wats a tech 1 ?
and my second question is does anyone have a clue wat is wrong with my car holden told me the only problem with it was the fuel regulator and my powersteering pump got its capped replaced other than that its fine except for the no starting first thing which had them stummped because they could do a tech 1.
sorry for the long dramatic story but this has had me baffled for 5 months and i want to learn more about this tech 1, 2 ,etc...
mine is a bit like this but only for 4-5 secondsOriginally Posted by Dezza
Adam
Isn't that a well known thing that happens when you have a leaky injector (or four)? I've read it on these forums a 100 times I rekon, did they check them?
Aussie Muscle Fan
Tech 1, tech 2 etc. are basically just code scanners I think, for different versions of the ECU. They pull diagnostic error codes from your ECU, and can also make changes to some settings if I rememember correctly. Probably more complicated than that, but meh, thats all the local bloke uses his for, pulling codes from shitheap VN's that have done an O2 sensor.
I think foamy might be onto something with the injectors, but anyway, theres a sticky at the top of the VN/VP area about VN faults, take a look at the link in there, see if you can find your problem in there, it's fairly comprehensive.
Physics Geek
It can also happen when the power to the fuel pump isn't doing the right thing. When the relay that runs the fuel pump craps itself, it clearly can't supply power to the fuel pump.
However Holden built in a failsafe circuit, basically if the fuel pump can't get power in the normal way, once the oil pressure switch closes (ie. oil pressure comes up) it can supply power to the fuel pump. It can take anywhere between 5 and 25 seconds of cranking a motor to cause the oil pressure to rise sufficiently to close the switch and power the fuel pump.
Might just be that the primary circuit for the fuel pump is down.
Gravity is proof that nature keeps getting us down.
Aussie Muscle Fan
Another good idea, the way to check for that would be to click the ignition to the on position, (not accessories, ON) and just listen for the fuel pump, if you can't hear it whining away till it builds up pressure then that may well be your problem.
your local HSV dealer
well things i have checked and have got holden to check
Injectors have been checked
fuel pump checked
fuel cricuit and relays checked
oil pressure checked
oil pump checked
oil pickup checked
fuel regulator checked
they went over the whole car from front to back elctronically and mechanically and are still stummped i know for a fact that the fuel pump wont go on till the oil light goes out but its been check by holden myself and two others and its all working fine its such a ****ing annoying problem
Aussie Muscle Fan
So ok, just to clarify, you are saying that the fuel pump doesn't activate until the oil light goes off after a few seconds of cranking, when it should in fact be activating as soon as the ignition is on? If that is the case then I dont give a **** what the holden guys are saying, mouce has it right. The circuit to activate the fuel pump isn't working and the secondary which activates it when oil pressure rises is starting it. Take it to a competent auto-electrician and tell them the problem man, dealership dudes are just a pain in the arse.
The Fuel pump should go instantly, sounds like that's your problem (what mouce said) ^^^^^
Physics Geek
Just to say it another time, as soon as the ignition is turned to 'on' the fuel pump is meant to activate and bring the fuel lines/rails up to operating pressure, if it's not doing that then Holden are screwing you.
The easiest way to test it is disconnect the wire which runs to the oil pressure switch on the engine (the wire down near the oil filter), by doing this the oil switch CAN NOT power the fuel pump, and I think you'll find that it does the same thing as what it is already. By doing this you'll be able to crank and crank and crank and nothing will happen.
Gravity is proof that nature keeps getting us down.
your local HSV dealer
yeah but when that wire is disconected there is no oil pressure circuit and the engine wont start without that ciruit going anyway
Where am i looking on the fuel circuit then casue i know its been thougroughly tested at least twice i have tested the relays checked fuses check eroor codes chaged pumps new oil pressure sensor i just give up
Physics Geek
Actually, the engine should start, the light will be on, but it should start. Having the oil pressure switch connection disconnected shouldn't stop it starting.
Gravity is proof that nature keeps getting us down.
Hope this helps?
You have the possibility of the fuel pump relay itself being faulty.
From my humble experience, one of the common mistakes with checking relays is not checking them under load (attached to the thing they feed power to). It is generally easier to unplug the thing that the relay feeds, and check that power is arriving there, as it is easier than tapping into the wiring or trying to get a test probe into a connector without destroying it.
This is a real problem when checking relays with burnt contacts - a common failure mode with old relays. The test light or meter doesn't draw much power and everything appears ok, but when you plug the leads back in it just doesn't work as expected. This can also happen with dirty or corroded fuse holders.
Side-note: It was almost funny to have to help out one of the local mechanics with a similar problem with his own VR ute - in his case, the ignition relay had failed and was only supplying about 4.5 volts to the ignition system until the relay contacts warmed up - again this was only happening when the engine bay was cold first thing in the morning!
The mechanic had tried another relay without success (was another relay from the same car) - just his dumb luck to try another one with the same fault!
your local HSV dealer
well i got my car fixed at last
turned out to be the fuel circuit relay and an oxysensor and something else the reason it never picked up the fuel thing in the tech was because it did the fuel regulator would report an error first then it would come up fine till it cold started again and it would re register a fault.
but nows shes all fixed and has shit loads of power back now all the fuel is being burnt right and shes not missfireing all the time
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