My sons Tp magna is driving me insane. I took the carburettor off as I thought the needle valve
may be faulty as it was hard to start when hot sometimes. The car was running fine otherwise for a 20
year old car. After replacing gaskets in carburettor the car was fouling up the plugs all black which it hadn't done before did a 1000km trip to Roma and back in January this year without problem. It first ran fine then started missing.
I have since got a second hand carby and the car ran fine when fitted but a short way down the road started running rough and missing. I took it for a drive to Goodna about 32km round trip ran all right at 100km missed sometimes but then when I came back and had to stop at lights the car would not idle and the motor would just die. When pushing the accelerator down the car would die out. It took a few attempts at revving the car up to get across the intersection to get home.
I put new spark plugs in today as I thought it was because they were fouled was the problem but it ran
worse than yesterday. I drained the water below the carby and the car started fine and ran ok so I thought water must be leaking from the carby into the inlet manifold. Took carby off and put a new gasket on and the car wouldn't start put petrol down carby and it started and was idling ok. Went to take it for a test run and the car had no power when accelerating not enough to move the car at all.
I am really baffled as I have never had a car that has given so much problems as this one and I certainly regret removing the carby as the car was at least driveable before.
Theories so far
1, I wonder if I have put some of the emission control hoses in the wrong place but I
would have thought the car would still run and not this bad. I have looked at an emission control
diagram from a manual. It looks like the air injection valve has been taken off previously.
I have tried to follow all the vacuum hoses but there is a lot of them. The thermal valve on inlet manifold is broken the nozzles have come off I have tried to repair this but not successfully.
I almost got another one from a wrecker but it broke trying to get it off those nozzles are so fragile
2, The replacement carby has problems and I should use the old one I have put a new secondary diaphragm on the one in use now. I have replaced almost all of the vaccuum hoses
3, The water running through carby for auto choke is getting into inlet manifold. This morning the plugs were white on the end of the electrodes
4, Maybe the car has a blown head gasket now? Although even with a blown head gasket I
would expect the car to run better than this.
5, Could it be the coil not working properly. Twice the car has run well and then after a short time
it was missing really badly and loses all power sometimes and wont idle to the point the motor dies out. My son drove about 10km the car went fine he went to start the car again after an hour and it started fine then it stopped and he couldn't start it again. I went there got it started but it was missing really badly and struggled to get the car back home.
Any help would be greatly appreciated thanks

If in brisbane drop it over
I am on the inner north side
PM me week day or weekends

is it an automatic ?
we can do tests ... bring all the carby bits you have

Seems current settings are not working
could only be spark or fuel related

when its dark pop the bonnet and look for
arcing and sparkles fron the leads /coil/dissy cap and wires

that will eleiminte one obvious cause
then its down to fuel

Hi Magna Buff thanks for the quick reply and offer of help. At present the car wouldn't make it to Brissy possibly could have made it the way it running on Friday night. But when it loses power its downright dangerous. I had to have 2-3 attempts just to get across a couple of local intersections at low speed and not peak traffic.

I am thinking it is the charcoal filter on the emission control. I read the post by someone Called Coldimous I think from memory headed fuel pump and what he described is exactly whats happening with my sons car. It was intermittent, the motor died, he couldn't restart it. It spluttered under load and was bucking.

This maybe the problem as when I cleaned out the carby I found what looked like bits of plastic in the carby and now I think that this could of been bits of charcoal from the charcaol canister as it has a fairly large pipe to the carby. I also put meths in the fuel in case there was any water in it and this could have loosened the charcoal. Will check it out tomorrow.

Its a manual TP


If in brisbane drop it over
I am on the inner north side
PM me week day or weekends
http://www.aussiemagna.com/forums/showthread.php?t=37200


is it an automatic ?
we can do tests ... bring all the carby bits you have

Seems current settings are not working
could only be spark or fuel related

Yes this is a great idea MB



when its dark pop the bonnet and look for
arcing and sparkles fron the leads /coil/dissy cap and wires

that will eleiminte one obvious cause
then its down to fuel

This has been a great car up to now. It would be a shame to scrap it as it has only done 136,000km so far
but it really has been a major source of frustration and I have been sorely tempted to cut it up into little pieces.

I am thinking it is fuel. The car used to start well before when cold. Tonight it needed petrol poured down the carby just to start and
then it would only idle and slower than usual which is about 1300rpm from cold now about 900rpm or 1000rpm if it was electrics breaking down it would be under more load I think. I will strip down original carburettor tomorrow and look for anything that will cause blockages.




when its dark pop the bonnet and look for
arcing and sparkles fron the leads /coil/dissy cap and wires

that will eleiminte one obvious cause
then its down to fuel

in my neighbors Mazda Ute we have had problems with fouled points causing exactly the same symptoms. i was certain it was the flue system as it would foul the plugs in 10 minutes flat and got to a point where it was not drivable. i know the efi magnas dont have points but the carby may? could also be retarded timing or an arcing dissy button / cap as was mentioned before causing the same thing.
as i said in my last post im no expert but thats just my 2 cents
regards jay

Blocked fuel filter?

Thanks.I did check the fuel filter before and it was ok I can see petrol in it and petrol is getting to the carby so I don't think this is the problem
but I will recheck it. Thanks. I have checked the original carby and I found 2 or 3 bits of what I assume is charcoal in the bottom of the vent valve housing. Otherwise carby is clean as I cleaned it before. I will blow out the jets as if one of these bits of grit got in there it would cause problems.
I also found the auto choke linkage had come off so that would have caused the fouling problem as the auto choke would stay on.

Thanks OM it has solid state ignition so is not the problem. I am thinking it is fuel related now not electrical.
The grit that has got into the original carby got into the vent valve area and that is directly connected to the
charcoal canister so I suspect bits of charcoal has got into the carby from that which would explain why ithe car
will run alright sometimes.

the fuel pump is low pressure about 3 psi
you might find one at a wrecker

getting the pump out of the tank is a pain

in your other post on the forum about bubbles in the oil you mention someone having the same problem that was connected to the charcoal canister. you say you have found bits of what you suspect is charcoal in the carby. to me it sounds too much of a coincidence. i have looked in my Gregory manual and it seems that the charcoal canister is connected to the carby and feeds hydrocarbons (unburnt fuel vapor) into the intake system for burning to reduce green house emission. dont know whether this is a coincidence or weather its connected but either way its worth a look
hope this helps
regards jay

Found the problem there was a mass of charcoal in the carburettor I bought. I have now fitted the original carb to the car. Anybody that doesn't believe a TP Magna carby can suck charcoal out of the charcoal canister have a look at the pic in my album on my profile. All of the crud on the cardboard that came out of the replacement carby I fitted to my sons car. The larger piece is what was left of the vent valve rubber seal.