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Car Forum / Australian Car Forums / General Car Topics (Australian group) / March 2008VH Commodore Questions
Hi group, I've just brought an 82' model VH with a 202 reco engine which has been converted to gas. It has apparently been properly modified to run on gas, cannot use petrol now they tell me. Is there any special oil I should be using? Also, this car has been fitted with an after market sports steering wheel and is causing the horn to go off when selecting the left indicator and turning left. I dont yet have the manual for this car so I dont have the wiring diagram yet. Any suggestions as to where to look for the horn prob? Another one, the auto transmission slips when starting in drive mainly between 2nd & 3rd, the way around this has been to start in 2nd and when it gets near 60k's changing back to drive minimizises the prob. Is this gearbox screwed or is there some adjustment I can do? Cheers Mark > Hi group, > I've just brought an 82' model VH with a 202 reco engine which has been > converted to gas. > It has apparently been properly modified to run on gas, cannot use petrol > now they tell me. > Is there any special oil I should be using? You can buy oil supposedly especially formulated for LPG vehicles but really it doesn't make that much difference IMO as long as you change it on a regular basis. > Also, this car has been fitted with an after market sports steering wheel > and is causing the horn to go off when selecting the left indicator and > turning left. > I dont yet have the manual for this car so I dont have the wiring diagram > yet. > Any suggestions as to where to look for the horn prob? Pull the steering wheel off and check to see what is shorting the horn earth circuit to ground. (wire or the contact pin for the original steering wheel). The wiring is pretty basic and a quick visual and maybe few probes with a testlight should locate the problem. > Another one, the auto transmission slips when starting in drive mainly > between 2nd & 3rd, the way around this has been to start in 2nd and when > it gets near 60k's changing back to drive minimizises the prob. > > Is this gearbox screwed or is there some adjustment I can do? You can change the auto fluid and adjust the bands. If the old fluid is black then it's probably past it. While your at it check that the vacuum modulator isn't leaking and the hose/pipe/hose to the manifold isn't losing vacuum. >> I've just brought an 82' model VH with a 202 reco engine which has been >> converted to gas. [quoted text clipped - 5 lines] >it doesn't make that much difference IMO as long as you change it on a >regular basis. I agree, but I would add that if you can find ordinary oil with an API CF rating or higher, it should give you much the same acid buffering that you get from a special LPG oil. Also - avoid synthetic oils unless you have one of those upper cylinder lube devices. They make dry combustion even drier.  SignatureCheers Paul Saccani Perth, Western Australia. > Another one, the auto transmission slips when starting in drive mainly > between 2nd & 3rd, the way around this has been to start in 2nd and when it > gets near 60k's changing back to drive minimizises the prob. > > Is this gearbox screwed or is there some adjustment I can do? If the slipping is acompanied by a loud moaning sound,..a band is slipping. This can be due to no adjustment for years or more commonly, the band is knackered with little usable lining left. In 2 Vals I had with the Borg-Warner 35 I think it was, the trans would slip in second-gear, as this gear is the one where there is more throttle and torque applied. It could be a worn oil-pump, guessing here. A service will tell you heaps. Lots of metal in the pan is bad news. Jason >> Another one, the auto transmission slips when starting in drive mainly >> between 2nd & 3rd, the way around this has been to start in 2nd and when [quoted text clipped - 14 lines] > > Jason Thanks for the replies. I should have mentioned that not only does slippage occur during the change from 2-3 but that it will slip when in 3 especially up a hill. That would be front clutch and not bands wouldnt it? I'm only going by what i've read on a borg warner fitted to Dats 200b. What gearbox is in this model? Thanks again. Mark What make of box would be in this car? >>> Another one, the auto transmission slips when starting in drive mainly >>> between 2nd & 3rd, the way around this has been to start in 2nd and when [quoted text clipped - 22 lines] > I'm only going by what i've read on a borg warner fitted to Dats 200b. > What gearbox is in this model? Trimatic. >>>> Another one, the auto transmission slips when starting in drive mainly >>>> between 2nd & 3rd, the way around this has been to start in 2nd and [quoted text clipped - 26 lines] > > Trimatic. Thanks Klokmeester, Further investigations have confirmed that it is indeed a Trimatic. We felt that checking the vacuum at the modulator was a good idea (as suggested by this group)and found that the small rubber hose section at the modulator was as loose as hell, so we replaced it. We also replaced the manifold end hose. Things were actually better after this but not right yet. So i'm thinking that the diaphragm in the modulator is leaking as well, there was some oil in the line. So I guess we'll replace that and clean the line too. Is it true to say that when undoing the modulator, oil will spill? and is that the usual way to drain the oil? Another symptom of our hassles is that the gear changing speed (from 1st to 2nd) is much different depending if in drive or 2nd, selection when taking off. It's a quicker shift when starting in 2nd then putting it into drive to get 3rd when needed. Regards, Mark >>>>> Another one, the auto transmission slips when starting in drive mainly >>>>> between 2nd & 3rd, the way around this has been to start in 2nd and [quoted text clipped - 40 lines] > So I guess we'll replace that and clean the line too. > Is it true to say that when undoing the modulator, oil will spill? A little bit, but not much. and is > that the usual way to drain the oil? No, the usual way is to drop the pan (in absence of a drain plug). Not necessary for replacing the modulator though. > Another symptom of our hassles is that the gear changing speed (from 1st > to 2nd) is much different depending if in drive or > 2nd, selection when taking off. > It's a quicker shift when starting in 2nd then putting it into drive to > get 3rd when needed. My VH had exactly those same symptoms and they get progressively worse because the box was knackered however it's worth adjusting the bands if you are going to go to the trouble of replacing the modulator. I can't remember the adjustment off the top of my head, but any workshop manual should give you the details on how to do it. > Hi group, > I've just brought an 82' model VH with a 202 reco engine which has been > converted to gas. > It has apparently been properly modified to run on gas, cannot use petrol > now they tell me. > Is there any special oil I should be using? Not really. Oil generally tends to be one of those things where everyone has a favourite flavor, but what you use won't make anywhere near as much difference as how often you change it. > Also, this car has been fitted with an after market sports steering wheel > and is causing the horn to go off when selecting the left indicator and > turning left. > I dont yet have the manual for this car so I dont have the wiring diagram > yet. > Any suggestions as to where to look for the horn prob? The horn contact under the wheel sounds like it's up the sh.t. > Another one, the auto transmission slips when starting in drive mainly > between 2nd & 3rd, the way around this has been to start in 2nd and when > it gets near 60k's changing back to drive minimizises the prob. > > Is this gearbox screwed or is there some adjustment I can do? If it's the standard auto for the car it'll be a trimatic, and there's a few adjustments you can do. However you'd be best buying or borrowing a workshop manual to learn how to do them properly. One thing you can check quickly is the vacuum modulator which is a small round metal canister hanging off the back of the trans and has a metal pipe running from it to the inlet manifold. They often leak and/or have the pipe come off completely which makes the trans carry on like you've described. -- Regards, Noddy. |
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