Hello all,
I have decided to ask a prado forum on thoughts about my issues with my prado.
i have just joined so i apologise if i have posted this wrong.
I own a 2000 Vzj95 prado 3400 v6 GXL.
I bought it 2 years ago with a missfire that i couldnt put to my knowledge as a head gasket issue, thinking it would be coils or something... got it cheap.
I am not new to cars and have good knowledge regarding diagnostics. But this baffles me.
i have done a lot of work to it in this time, new suspension, rack, mounts, full major included the trans and diffs, new rad, new hoses, water pump, timing belt etc... basically gone right through the 4wd as i want it for trips and being at 395ks i knew most of it would be stuffed... i replace all 3 coils with new genuine ones, new leads and plugs... the missfire continues...
Fuel filter is done and all...
it still rough idles and yet drives fine under load... pops in the exhaust at idle like its missing a cylinder or its open.
year later, its now worse... but only suddenly, now i find its progressively worse after its first run. From cold its ok but rough and after it reaches temp its still fine.... park somewhere and come back and i get 5 cylinders...
Sometimes it comes good whilst driving and sometimes not.
I have TK tested it, no combustion read. It doesnt use coolant or overheat and the oil is clean.
I have heard it could be a valve riding? But it changes too often and between to be something that should be stuck open?
Also i notice it really plays up when i use the aircon.
the plugs read fine too.
i just am trying to avoid pulling it apart and rebuilding it and wasting time and money
i was leaning on an old cam sensor?
obviously its not crank as it runs.
it does take a few cranks to start though.
compression test is basically 140s across all banks dead cold.
any help would be great, i wonder if anyone else has had this issue?
I have decided to ask a prado forum on thoughts about my issues with my prado.
i have just joined so i apologise if i have posted this wrong.
I own a 2000 Vzj95 prado 3400 v6 GXL.
I bought it 2 years ago with a missfire that i couldnt put to my knowledge as a head gasket issue, thinking it would be coils or something... got it cheap.
I am not new to cars and have good knowledge regarding diagnostics. But this baffles me.
i have done a lot of work to it in this time, new suspension, rack, mounts, full major included the trans and diffs, new rad, new hoses, water pump, timing belt etc... basically gone right through the 4wd as i want it for trips and being at 395ks i knew most of it would be stuffed... i replace all 3 coils with new genuine ones, new leads and plugs... the missfire continues...
Fuel filter is done and all...
it still rough idles and yet drives fine under load... pops in the exhaust at idle like its missing a cylinder or its open.
year later, its now worse... but only suddenly, now i find its progressively worse after its first run. From cold its ok but rough and after it reaches temp its still fine.... park somewhere and come back and i get 5 cylinders...
Sometimes it comes good whilst driving and sometimes not.
I have TK tested it, no combustion read. It doesnt use coolant or overheat and the oil is clean.
I have heard it could be a valve riding? But it changes too often and between to be something that should be stuck open?
Also i notice it really plays up when i use the aircon.
the plugs read fine too.
i just am trying to avoid pulling it apart and rebuilding it and wasting time and money
i was leaning on an old cam sensor?
obviously its not crank as it runs.
it does take a few cranks to start though.
compression test is basically 140s across all banks dead cold.
any help would be great, i wonder if anyone else has had this issue?
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