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Location:
Bayside Melbourne.
Registered:
May 2003
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7MGE questions regarding temp sensors.
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Sun, 01 May 2005 09:54
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With the 7MGE (specifically MX83 7MGE) how many temp sensors are there?
The reason I ask is because my 7M doesn't like to start when it's at all warm. I am thinking that the ecu is sensing the engine is dead cold and loading it up with more fuel than it needs. The engine starts perfectly when left for 24hours and even better if left for longer.
Before you all suggest things...
I've replaced o2 sensor, replaced injectors, checked fuel pressure, replaced fuel filter, check spark and leads, checked cold start injector and idle speed control motor, check error codes (none logged).
The temp senders are the next step on the list but I need to know how many there are and where they are located.
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Location:
sydney
Registered:
March 2003
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Re: 7MGE questions regarding temp sensors.
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Sun, 01 May 2005 10:40
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they have a cold start injector
this injector works off a thermo sensor and should stop the injector workin over a certain temp about 30 or 40 degrees
so when its warm test to see if the cold start injecotr
is working
it should not work when hot
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Location:
Bayside Melbourne.
Registered:
May 2003
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Re: 7MGE questions regarding temp sensors.
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Sun, 01 May 2005 11:08
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how long do you reckon the engine could stay above 30degrees for if it's left to sit?
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Location:
Brisbane
Registered:
February 2003
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Location:
Bayside Melbourne.
Registered:
May 2003
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Re: 7MGE questions regarding temp sensors.
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Sun, 01 May 2005 12:28
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| thechuckster wrote on Sun, 01 May 2005 21:47 |
easy way to check if problem is the CSI - unplug the lead going to the injector - see if problem persists
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Tried that... and yes, the problem persisted. I gave it a couple of weeks with the lead disconnected.
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Location:
melb
Registered:
June 2003
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Re: 7MGE questions regarding temp sensors.
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Sun, 01 May 2005 13:45
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its annoying i know but its common with mainly series 1 mx83,s but ive seen a couple of late ones do it , it does seem they overfuel when starting, its get worse when when u make the head flow better and bump the comp up a bit, i have never looked into fixing it as u just crank it a bit longer and then they start. karmen vortex afm 7m,s dont have the problem which is nice
D
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Location:
Bayside Melbourne.
Registered:
May 2003
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Re: 7MGE questions regarding temp sensors.
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Sun, 01 May 2005 13:57
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| cambelt wrote on Sun, 01 May 2005 23:45 |
its annoying i know but its common with mainly series 1 mx83,s but ive seen a couple of late ones do it , it does seem they overfuel when starting, its get worse when when u make the head flow better and bump the comp up a bit, i have never looked into fixing it as u just crank it a bit longer and then they start. karmen vortex afm 7m,s dont have the problem which is nice
D
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Finally... someone who seems to know what I'm talking about! 
I've lived with the problem for quite a while now but since I spent $3500 rebuilding the engine (plus the $1500 in injectors, 02 sensor etc...) it's really shitting me that it doesn't start like a brand new engine. If I hadn't spent much on the engine I could excuse some minor excentricities but for $5000 in 2 yrs I expect more.
what are these karmen vortex afm's? What is the difference between the early 7M's and the late ones? My car is a mid 1991 model and the engine was rebuilt to standard specs ie: no headwork.
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