Massive fuel consumption, takes off from lights
Here are my two problems, I'm getting close to 2k's per litre after I redid the heads. Missing, and a really strong fuel smell in the exhaust and engine bay.
Second is when I take my foot of at the lights, no accelerator, the car will eventually reach 70k's. All no throttle. Idles in neutral at 2200 revs for about a minute the drops down to about 1200, stays the same in all gears.
This car is driving me crazy.
I think that might be the next bit. Even your diagnosed. I just wish finances weren't an issue. Just finished uni, go back to full time hours in a fortnight.
Banned
Lol, This might sound really stupid but it is an idea. Check for a fuel leak. might help with the consumption problem. who knows?
Yeah will do. Tomorrows job is checking earths, new injector o rings, and fuel check. Even when I unplug a lead or an injector, it still runs the same.
Banned
Lol, well it is a VT. Maybe It doesn't like you anymore and this is the sign to upgrade to a VY/VZ or maybe a VE?
Yeah I think so too. Need the old girl to live for a few more months though. I love her, had it for ages.
Banned
Lol. what about when the few months are up. what will you be lloking at getting.
Not sure yet. I'm a muso and carry a stack of guitars and amps and keyboards etc on a regular basis so I need something that affords the practicality of my wagon. Preferably something cheap to run and service.
Donating member
With all that fuel splashing around, I hope you don't smoke!
sounds like a massive vacuum leak
or possibly your throttle cable is stuck partially open
check your codes may be a hint there
Exhaust Guru
I reckon vacuum leak as well. Purge hose on the bottom of the throttle body? Were the heads and intake manifold perfectly clean? Wasn't an old bit of gasket or something still there?
Purge hose is on. I'm thinking the same. All gasket faces were spotless. Spent a day cleaning everything. Also, heads were welded for cracks between valves and duly reco'd. Would a leak in the inlet manifold rubber seals cause this, especially the insane fuel consumption? And so far I've done 70'ks with the engine back together, if I take the inlet off will I need a new gasket kit? I have a feelin I may have put the rubber seals on wrong.
Re your second problem, make sure you haven't adjusted the throttle cable too tight on the adjustment near the throttle body. It needs to be quite loose, otherwise you will get the symptoms you are experiencing.
When you say you "redid the heads" what does that mean? Cleaned them up? Larger valves? Ported and polished? Did you get a professional to "redid the heads" or did you do it yourself?
Heads were done professionally. A few cracks between valves were welded. All valves were re seated. Other than the gasket faces being shaved, the guy, Paul Gilbert from Gilbert cylinder heads in southport said they were good for another 150'000.
Will check the throttle tomorrow morning. Cheers
Could a leak in the rubber seals cause the massive fuel consumption?
if a proffessional did the job he obviously didnt do it properly so take it back. unless of course he only 'redid the heads' and you rebuilt the engine yourself. in which case.... maybe dont blame the proffessional
Donating Member
ok from what you've described, there is a massive vacuum leak around the manifold beit base, runners, plenum or throttle.
just before you start removing shit, grab a can of crc with the nozzle, in quick spirts, spray around the edges, if there is a leak it will suck in the crc and the revs will increase. you've found your leak, note it and continue checking.
if your not sure about the crc, i would be pulling it off and checking the gaskets and o-rings.
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Originally Posted by JEZIMP
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I rebuilt it, the pro did the heads. Not blaming him, the guys a legend. Comes very highly recommended from local mechanics and the boys at cheapa auto.
Will do te crc test tomorrow. I've had new gaskets on for about 75 k's. Will I need a new inlet manifold gasket kit or would the old ones be ok? The rubber seals didn't fit over the block very well at all. Almost as if they were too thin. Is there any difference between s1 and s2 engines that would effect this. I got a series one vrs kit for the heads.
Dont use old gasket's..It will just cause problem's
Series 1 is the same except for diffrent location on the PCV valve. between the plenum and runner's
But yeh.. new gasket's is the way to go..
Make sure to put silicon in the corner's of the orange seal's.
K so I redid the inlet manifold gaskets, new injector o rings. Everything was cleaned. And it's still running like a dog. Could the purge hose, if it's a crack under the insulation, cause the problems? On visual inspection it seems fine and the boots are on tight. Going to test for leaks in a second with crc so I'll see what happens.
Yeh purge hose will make it run crap!, Mine fell off once and my car wouldent idle propley, wouldend rev propley, just all round made it heap's worse.
But im not sure if just a lil crack would make big problem's becuse there is the rubber hose over it.
Pulled the off today, it wasn't cracked anywhere. Even pulled the insulator off, nothing. Crc test on all the inlet seals, no leaks. Taking it to a mechanic on friday for a compression test. Weird thing is, above 1200 it runs fine.
Still starts up at around 2500 though, and it's holding revs in both neutral and on the road, as in if ur at 2000, and take your foot of the gas, it'll stay at 2500 for 30 seconds then drops to about 1200, all while maintaining or increasing road speed. And still using a bucket of fuel as well.
check your tps my old vu ute did the same thing
CIRCLE WORK 97 VT COMMODORE 3.8L WORKED
It sounds more like a flooding problem to me. Too much fuel is getting into the combustion chambers and it is not being burnt efficiently.
Wipe your finger around the inside of the exhaust pipe and see if anything comes off.
A black sooty residue normally indicates unburnt fuel is ending up in the exhaust system.
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