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Help please evo 8

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Old Feb 16, 2017, 12:08 PM
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Help please evo 8
Car wont start..it will crank but wont turn over new ecu..got the lock smith to reprogram/ disable the immobilizer..still no start pulled codes with the lock smith. no errors/ codes came up..i asks him is it a bad computer he said no...what can it be?
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Old Feb 16, 2017, 02:16 PM
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start with the simple stuff, Spark and fuel.
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Old Feb 16, 2017, 04:25 PM
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Yep, check coils/plugs, fuel pump and MAF.
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Old Feb 17, 2017, 05:50 AM
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Make sure Ignition is powering up. Blown fuse on ignition circuit?
Fastest way to check is at the main harness at the key cylinder, there are 2 ignition wires. I forget what colors they are look it up, make sure they both have power when the key is in the ignition position.

Ignition 1 is Black/white
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Old Feb 17, 2017, 09:58 AM
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Originally Posted by 4G63_EVO
start with the simple stuff, Spark and fuel.
the fuel pump not working not making any type of noise when i turm the key on the on position..
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Old Feb 17, 2017, 10:00 AM
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Have you checked the fuel pump relay?
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Old Feb 17, 2017, 10:50 AM
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Originally Posted by Evo VI.
Have you checked the fuel pump relay?
Yes i only know of 2
one was bad brought a new one..but fuel pump still dont make any noise when the key is turned to the on position.
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Old Feb 17, 2017, 11:08 AM
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Standard fuel pump?
if not is it hardwired?

Immobilisers on the car?
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Old Feb 17, 2017, 11:21 AM
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the ecu does not power the fuel pump until it gets a crank signal.
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Old Feb 17, 2017, 11:33 AM
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The pump should prime in the ON position.
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Old Feb 17, 2017, 11:37 AM
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Originally Posted by Evo VI.
The pump should prime in the ON position.
I don't know about an evo 6, but on an evo 9 it will not.
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Old Feb 17, 2017, 11:40 AM
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Originally Posted by Biggiesacks
I don't know about an evo 6, but on an evo 9 it will not.
Apologies, so Evo 9 uses crank signal to power the pump?
Same for Evo 8?
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Old Feb 17, 2017, 11:44 AM
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Originally Posted by Evo VI.
Apologies, so Evo 9 uses crank signal to power the pump?
Same for Evo 8?
Yes. Sorta. The ECU checks for continuity in the sensor. I.E. if you unplug the crank sensor, it will turn over but have no fuel.
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Old Feb 17, 2017, 11:46 AM
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Originally Posted by Evo VI.
Apologies, so Evo 9 uses crank signal to power the pump?
the ecu does not activate the fuel pump circuit until it receives a crank signal. Its this way on the 8 and 9, and I would assume the 7. If i had to guess, I would say its probably a safety feature. I did a lot of testing on this while reverse engineering the circuitry in the ecu that controls the fuel pump.
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Old Feb 17, 2017, 05:24 PM
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Originally Posted by Evo VI.
Standard fuel pump?
if not is it hardwired?

Immobilisers on the car?
stock car stock fuel pump...had the lock smith come over yesterday he disable it still nothing....he said the computer and the immobilizer is communicating with each other...ecu is good...thiink its just not getting any fuel so its not going to fire up.. Im going to take it to the shop and let you guy know
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