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Location:
Ballarat, Victoria
Registered:
March 2003
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 MA61 engine problems.....
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Tue, 23 December 2003 11:19
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okie dokie.... my ma61 has been backfiring, so we took it to our mechanic to have a look....
it appears that the water in the radiator is frothing and bubbly, almost soapy- maybe a mix of different coolants, dunno- and we aren't sure whether there is a thermostat in there- didnt have time to check....
number 6 spark plug was oiled up, and smells like its running rich.... which would explain the backfiring.
everything seems to point to a head gasket, however pressure and dye test dont...so mr mechanico is pretty sure it aint one...
so has anyone else had these problems??
to me, it sounds almost like an oxygen sensor or something... running rich etc.... what are these like to find, install etc???
so yes. what does all this crap sound like?? if it sounds nasty, would it just be worth dropping in the 7M-GTE now?? (bad option, no money AT ALL)
thanks y'all 
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: MA61 engine problems.....
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Tue, 23 December 2003 11:28
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if the HG is blown between an oil & water gallery, the comp test will show everything to be sweet
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Location:
Ballarat, Victoria
Registered:
March 2003
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Re: MA61 engine problems.....
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Tue, 23 December 2003 12:30
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hmmmmmmmm.... i see..... well ive drove it over 700kms the day i got it, would have the HG blown itself during that day?? (had to drive him home from aubury, and had to show friends new car  )
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: MA61 engine problems.....
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Tue, 23 December 2003 13:07
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well, bhg between oil & water gallery is fairly rare, unless there's a bore-gallery leak as well... but a frothy radiator is not good. any discolouration to your oil?
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I Supported Toymods
Location:
melbourne.vic.au
Registered:
May 2002
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Re: MA61 engine problems.....
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Tue, 23 December 2003 13:36
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| Evil_Foetus wrote on Tue, 23 December 2003 22:19 |
...to me, it sounds almost like an oxygen sensor or something... running rich etc.... what are these like to find, install etc???
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Sorry Evil... The MA61 was not fitted with a Oxygen Sensor coz the car was imported when Australia only had leaded petrol. Only after January 1st 1986, Unleaded was avaliable and mandatory for car makers to use 
*If No one Understand me... Please forgive me 
Cheers.
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: MA61 engine problems.....
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Tue, 23 December 2003 13:38
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| draven wrote on Tue, 23 December 2003 19:28 |
if the HG is blown between an oil & water gallery, the comp test will show everything to be sweet
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This would result in milk colour oil
very easy to pick up
Take all the plugs out and do a c/r test (when she's warm of course)
This is good to do just so you know how good the motor is (150+ is good, difference of 10 between all cyls)
Buy a new set of plugs
You dont have an o2 sensor (unless someone put in a Cressida 5mge + ecu)
Run a tank of 98
When is it back firing? at idle (a fluff or a pop?) then its the TPS or timing
Back firing when decellerating, dunno about that, its usually coz to rich, or a hole in cat/muffler, but you have no cat
Put a new set of plugs in and see how she goes
Also do a diagnostics to see if the ecu has picked up any errors
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Location:
Ballarat, Victoria
Registered:
March 2003
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Re: MA61 engine problems.....
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Wed, 24 December 2003 06:35
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hmmmmmm thanks everyone....
oil colour- no discolouration.
i run premium unleaded in it all the time (optimax, 98 octane (i think)), and the new plugs were put in...
it backfires between gears, usually when driven hard... and when the foot is taken off the accelerator... but not all the time, so yeah....
3 hours on the pressure test (radiator) and was fine. tube and dye tests were all fine....
probably going to get the ECU and exhaust gas looked at next...
so basically, there is air in the system, and the coolant is frothing, so we thinks that there is a reaction between two different coolants...
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Location:
cobden /vicoria
Registered:
November 2003
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Re: MA61 engine problems.....
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Wed, 24 December 2003 10:16
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I bet it`s the stupid friggin air pump!!!.....i had the same prob with my 5m.......i blocked off one side and it fixed the backfiring.
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Location:
Colac, Victoria
Registered:
May 2002
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Re: MA61 engine problems.....
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Wed, 24 December 2003 10:22
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well - flush out the coolant - and replace it - see if that solves the frothyness!
then - if not - go for the more nasty of possible reasons youve mentioned ..
ill be up in ballarat soon - gotta see the new wheels
Oh and i can direct you to a guy in ballarat that does a EXCELLENT job polishing the ma61 alloys - he did mine and they came up awesome + i can help you restore the onees you have
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Registered:
June 2003
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: MA61 engine problems.....
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Wed, 24 December 2003 11:56
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That frothyness in the radiator is from an additive that someone put in there to clean the block
I did this on mine, biggest mistake
I flushed it out with new distilled water about 5 times, didnt solve it, and then high pressure flushed it with a jerry-rig air compressor
Still didnt fix it
So my advice is to ingore it!
As for the backfire Ryley, have you checked the timing?
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Registered:
August 2002
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Location:
Ballarat, Victoria
Registered:
March 2003
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Location:
Melbourne
Registered:
May 2002
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Re: MA61 engine problems.....
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Fri, 26 December 2003 12:18
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I would be more concerned the shit in your radiator is chemi-weld!
I would guess that would be why the #6 plug is looking crapy
If its the gasket on a 5m is can normaly be fixed for about $100 trust me i know 
Allan
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Location:
Ballarat, Victoria
Registered:
March 2003
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Re: MA61 engine problems.....
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Sat, 27 December 2003 12:06
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thanks alan....but erm....
whats chemi-weld? 
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: MA61 engine problems.....
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Sat, 27 December 2003 13:22
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Chemi-weld is a product that was designed so fill in cracks in a head, you pour it in the radiator, and presto, crack welded
But it has a habit of doing more than it should
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Location:
Melbourne
Registered:
May 2002
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Re: MA61 engine problems.....
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Sat, 27 December 2003 14:11
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or doing nothing at all
Allan
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Location:
Ballarat, Victoria
Registered:
March 2003
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Re: MA61 engine problems.....
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Thu, 08 January 2004 01:28
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hmmm...
we are going to take it to toyota and get the exhaust gas checked, and plug the ecu in or something, then go from there...
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