Toyota Hiace random ignition advance
Posted to Technical Discussion Forum on 9/22/2021
25 Replies
Hi Guys We are working on a 2005 TRH112 Toyota Hiace with a
1TR engine.
It came to us in pieces and we assembled the engine.
Problem is two fold. 1) Starts and runs for about 30 seconds
and then dies. Fuel pressure is good, spark is good. Vacuum
jumps around between 15-18 inches. We thought valve timing
initially but more details are explained in problem number
two.
When it does idle, as can be seen in the waveform we are
about 55deg BTDC advanced. At first I thought this was
strange but I have since read on Opel and Nissan sites that
some vehicles start off with 50deg advance on a cold engine
to heat it up quicker? Can anyone confirm this?
2) Switch off and try and start again and sometimes we have
a random crank no start situation with the timing advanced
to 400deg BTDC!!!!! and of course backfires because we
firing on the exhaust stroke now.
Whats really got me stumped is what (besides the cam and
crank signals) would cause such a drastic change in timing
triggers from the ECM? Both cam and crank signals do not
change in relation to TDC in both captures.
[1TR TRH112 cam and crank 50deg btdc] [1TR TRH112
cam and crank serious advance]
Darren Fraser Technician/Service Advisor Mechanics For Africa Ndola, Zambia
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