VT just suddenly died

Steven M · #1 12-09-2008, 11:05 PM

Hi all, the missus vt just suddenly died tonight while doing 100 on the highway. wouldn't restart but left it for a short while and it would restart but run very rough then eventually die again. I pulled the maf out of my vt calais and swapped it but it did nothing so I did a search on the forums and narrowed it down to the fuel pump or Crank angle sensor, although you can hear the pump everytime I turn the key. What do you think?

Also when i pulled the maf out of my car, the car still ran perfectly even when givin it the gas, that doesn't seem right to me. I can drive without it.

Cheers

Stevo

ACEMonkey · #2 13-09-2008, 01:15 AM

Did your computer log any errors? Was there any warning lights or indication on your dash (also check if any of your indication lamps are blown too).

Hazard a guess, it doesn't sound like your fuel pump or CAS. It sounds like one of your gaskets or seal is gone. Check your radiator and oil level - is it losng water and/or oil and also if theres lots of brown muck floating around your radiator cap?

Car doesn't need MAF to run. The MAF helps with fuel efficiency as it inputs into the PCM which then calculates how much fuel to put through your injectors. Without the MAF, the PCM would just squeeze as much fuel as it can to keep your car idling above 750/800RPM so you'll see your car will start drinking fuel without the MAF.

Ozzie · #3 13-09-2008, 03:06 AM

could be a blocked fuel line if its not the pump, its rare but it happens because not alot of people change the fuel filter.

also check the leads arent crossing over or shorting on the engine... i had the same problem couple of weeks ago, turned out to be the leads

Steven M · #4 13-09-2008, 06:49 AM

Yes it is logging code 15, coolant temp sensor voltage high. I wouldn't think this would kill it, would it? I cleared codes and it reappeared, all dash lights are working. I will have to check the rest as I couldn't see last night. Bout to go back and have another play with it. I will check what you suggested and get back to ya. Cheers for the help.

Steven M · #5 13-09-2008, 03:20 PM

Still haven't got it goin. No water in oil or oil in water. I have swapped over the TPS, CAS, Cam sensor, maf, coil pack out of my other working vt and reset the computer, hasn't logged any codes but still hasn't made a change. I have been able to get it to start and idle very roughly with the maf disconnected but once you put your foot down hard it just dies in the ass but if you gradually do it, the revs will pick up. I also pulled the hose from the fuel filter and gogo juice flow but does anyone know the flow rate. I started removing the plenum chamber and seeing if fuel squirts from each injector which it does only without accelerating but when foot down, no fuel squirts at all. Would this be a fuel pressure problem? I AM GETTING F***IN FRUSTRATED NOW.

Thanks in advance.

ACEMonkey · #6 14-09-2008, 01:20 PM

Sounds like problem with fuel getting past the throttle body. Its possible theres a mechanical failure there or possibly a blockage.

Steven M · #7 15-09-2008, 08:19 AM

no blockage in the fuel line. so far i have replaced all sensors except the crank angle sensor, but no codes log anyway. I have replaced the coil packs and module, spark plugs and leads, fuel filter, swapped over the fuel press req and injectors, also check the fuel lines fuel looks clean and pours out and still will not run properly. Tried other key, wiggle all the connections going through the firewall. Also checked all fuses and swapped relays. I can get it to start and idle fairly smoothly now by adjusting the TPS but once you put your foot down hard it just coughs and farts but when at idle it sounds as though there is a vac leak on the intake manifold. Cos this be a cause for my problem, perhaps the plastic gasket is shagged.

Steven M · #8 15-09-2008, 08:20 AM

by the way i also did a compression test and that came up good.

south21 · #9 15-09-2008, 08:44 AM

My commodore did exactly the same thing it turned out to be the fuel pump, even though I could here it spin up it wasn't putting out enough pressure, replaced it no problem since a bitch of a job 2 tips get a fuel line removal tool either repco or supercheap and the electrical connector in the top of the pump is tricky pull out the 2 locking pins then put a small screwdriver down where the red locking pin came from to lever the locking tab over to remove connector. hope this helps.

keith

Steven M · #10 15-09-2008, 11:09 AM

yeah well i just had a look, i don't have a fuel pressure tester but it does flow at just under 1litre per minute. Does anyone else know the flow rate that the fuel pump should pump out.

Steven M · #11 17-09-2008, 04:25 PM

FYI,

It ended up being the fuel pump, was working put not pumping out enough fuel, don't ring holden dealer because the local one here said that they only sell the pump and sender in a complete unit for $370 and you cannot purchase the pump seperately yet if you call repco they sell the pump only for $130.

jakebell · #12 18-09-2008, 09:54 PM

Quote:

Originally Posted by Steven M

FYI,

It ended up being the fuel pump, was working put not pumping out enough fuel, don't ring holden dealer because the local one here said that they only sell the pump and sender in a complete unit for $370 and you cannot purchase the pump seperately yet if you call repco they sell the pump only for $130.

just a little note gmh do sell the sender unit with cables for around $70 and a good pump should set you back around the same money from a good parts shop easy job to do yourself if you havent already done so...jake

snappy05 · #13 08-10-2008, 03:42 PM

hey dunno if im too late to render any assistance but by the sounds of your problem it sounds like ur TPS(Throttle Position Sensor) might be cactus. My VS did a TPS and had the same symptoms as you're describing. Don't bother going out and getting another TPS for it like I did because it needs to be set by a specialist but u should be able to get a complete throttlebody from a wrecker for about $45(thats how much I paid) and you should be all sweet. That is if thats your problem but it does sound like it. Good luck with it anyhow

fasamr · #14 10-11-2008, 01:41 AM

please any one can help in my ride vt v6 after cranking after the engine is started after 2 sec. i hear some noise from the engine dont kno wat is it second thing while travelling suddenly engine stops and dosent starts then after about half hour it starts normally keeps on doing this when engine stops while cranking i tried pluging out the plug lead from the coils one from each no spark while cranking any solutions i live in uae very very few mechinics to understand so please do help me