Evo No Start Condition
Thread Starter
Newbie
Joined: Jul 2019
Posts: 2
Likes: 0
From: Medina
Evo No Start Condition
Greetings,
I've got an evo which had injectors/fuel pump problems before it sat for a long time. After I got it, before trying to start it, I changed oil and oil filter, put a little of frogging oil in each cylinder, installed new battery, cleaned fuel tank, and changed fuel pump.
Now it is the time for the first try to start the car, the car cranks but no start. fuel pump is working and the car has fuel regulator with pressure gauge and yes, there is pressure.
I have tested spark plugs for spark, all of them have spark. Also, I have tested the fuel injectors harness's voltage, it seems all of the connectors have 10.5 volts when the car is in ignition ON. It looks like the injectors are shut off for some reasons. I suspected either the injectors are bad or crank angle sensor is bad.
Next, I tried starting the car using starter fluid, the car backfired
. I think next I should do compression test 
Anyone had same problem with injectors being shut? Any suggestions?
Extra Notes:
Old oil was in good shape.
ECU is in great shape.
Fuel Injectors is different than OEM, replaced with high impedance one with 14.5 ohms because OEM injectors were bad.
I've got an evo which had injectors/fuel pump problems before it sat for a long time. After I got it, before trying to start it, I changed oil and oil filter, put a little of frogging oil in each cylinder, installed new battery, cleaned fuel tank, and changed fuel pump.
Now it is the time for the first try to start the car, the car cranks but no start. fuel pump is working and the car has fuel regulator with pressure gauge and yes, there is pressure.
I have tested spark plugs for spark, all of them have spark. Also, I have tested the fuel injectors harness's voltage, it seems all of the connectors have 10.5 volts when the car is in ignition ON. It looks like the injectors are shut off for some reasons. I suspected either the injectors are bad or crank angle sensor is bad.
Next, I tried starting the car using starter fluid, the car backfired
. I think next I should do compression test Anyone had same problem with injectors being shut? Any suggestions?
Extra Notes:
Old oil was in good shape.
ECU is in great shape.
Fuel Injectors is different than OEM, replaced with high impedance one with 14.5 ohms because OEM injectors were bad.
EvoM Community Team Leader
Joined: Aug 2005
Posts: 5,690
Likes: 708
From: West Coast
That's pretty low voltage at the injector. Did the battery sit too? Sounds like an electrical issue brewing there. You might want to remove and clean your battery terminals and check over the harness.
Your going to have to give me details/context about the car. Especially things like is it tuned or OEM ROM, and are the injectors stock or aftermarket. Does it even try and fire or just crank? Are the spark plugs getting wet with fuel when cranking or are they dry. If dry are the injectors getting active low from the ecu, you can test this by placing [test light ground to battery positive] and [probe to ground wire in injector harness] while cranking.
If the crank angle sensor goes bad the fuel pump should not prime (unless it was rewired to do so).
Edit: reading comp fail
You have to bypass your fuel injector resistor pack and tune for high impedance injectors, you can't just swap them in.
The 4g63t uses a wasted spark ignition so that might have something to do with the backfire with starting fluid.
Your going to have to give me details/context about the car. Especially things like is it tuned or OEM ROM, and are the injectors stock or aftermarket. Does it even try and fire or just crank? Are the spark plugs getting wet with fuel when cranking or are they dry. If dry are the injectors getting active low from the ecu, you can test this by placing [test light ground to battery positive] and [probe to ground wire in injector harness] while cranking.
If the crank angle sensor goes bad the fuel pump should not prime (unless it was rewired to do so).
Edit: reading comp fail
You have to bypass your fuel injector resistor pack and tune for high impedance injectors, you can't just swap them in.
The 4g63t uses a wasted spark ignition so that might have something to do with the backfire with starting fluid.
Last edited by Biggiesacks; Jul 20, 2019 at 07:44 AM.
Thread Starter
Newbie
Joined: Jul 2019
Posts: 2
Likes: 0
From: Medina
I have checked compression on each cylinder and the results as follows: (Cold Compression Test)
Cyl:
1: 152.5 psi
2: 164 psi
3: 165 psi
4: 52 psi
and as you can see there's a problem in cyl #4 with intake valve which caused backfire. Since at least it has some compression, it might be the valve not seating properly, worn out, or it could be anything.
^True
Thank you for your reply.
The battery is new.
The previous person who worked on the car changed the injectors to different injectors with different connectors cause the OEM were bad (and yup they were high impedance one). I am going to get new OEM Injectors and reconnect old connectors.
I have both of OEM ECU and aftermarket one. It looks like OEM ECU has stock ROM and aftermarket one has a tune in it. I have tried and connected the aftermarket to diagnose injectors. The injectors were closed during cranking. (Unfortunately, I was unable to establish connection with OBD2 port with OEM ECU)
The car just cranks and injectors are off.
The spark plugs coated in oil due to worn rocker cover spark plug gasket, but they look just fine.
I forgot to say that the backfire was in the intake and was not in the exhaust.(leaky valve as I figured it out in compression test)
It is looks like I am going to pull the head and fix the valve issue then reinstall OEM injector then try again and start.
Thank you for your time and for the info as I am new to the evo world.
Cyl:
1: 152.5 psi
2: 164 psi
3: 165 psi
4: 52 psi
and as you can see there's a problem in cyl #4 with intake valve which caused backfire. Since at least it has some compression, it might be the valve not seating properly, worn out, or it could be anything.
if they are anything different from the stock one or bigger injectors, you will need to tune it for the injectors.
Thank you for your reply.
That's pretty low voltage at the injector. Did the battery sit too? Sounds like an electrical issue brewing there. You might want to remove and clean your battery terminals and check over the harness.
Your going to have to give me details/context about the car. Especially things like is it tuned or OEM ROM, and are the injectors stock or aftermarket. Does it even try and fire or just crank? Are the spark plugs getting wet with fuel when cranking or are they dry. If dry are the injectors getting active low from the ecu, you can test this by placing [test light ground to battery positive] and [probe to ground wire in injector harness] while cranking.
If the crank angle sensor goes bad the fuel pump should not prime (unless it was rewired to do so).
Edit: reading comp fail
You have to bypass your fuel injector resistor pack and tune for high impedance injectors, you can't just swap them in.
The 4g63t uses a wasted spark ignition so that might have something to do with the backfire with starting fluid.
Your going to have to give me details/context about the car. Especially things like is it tuned or OEM ROM, and are the injectors stock or aftermarket. Does it even try and fire or just crank? Are the spark plugs getting wet with fuel when cranking or are they dry. If dry are the injectors getting active low from the ecu, you can test this by placing [test light ground to battery positive] and [probe to ground wire in injector harness] while cranking.
If the crank angle sensor goes bad the fuel pump should not prime (unless it was rewired to do so).
Edit: reading comp fail
You have to bypass your fuel injector resistor pack and tune for high impedance injectors, you can't just swap them in.
The 4g63t uses a wasted spark ignition so that might have something to do with the backfire with starting fluid.
The previous person who worked on the car changed the injectors to different injectors with different connectors cause the OEM were bad (and yup they were high impedance one). I am going to get new OEM Injectors and reconnect old connectors.
I have both of OEM ECU and aftermarket one. It looks like OEM ECU has stock ROM and aftermarket one has a tune in it. I have tried and connected the aftermarket to diagnose injectors. The injectors were closed during cranking. (Unfortunately, I was unable to establish connection with OBD2 port with OEM ECU)
The car just cranks and injectors are off.
The spark plugs coated in oil due to worn rocker cover spark plug gasket, but they look just fine.
I forgot to say that the backfire was in the intake and was not in the exhaust.(leaky valve as I figured it out in compression test)
It is looks like I am going to pull the head and fix the valve issue then reinstall OEM injector then try again and start.
Thank you for your time and for the info as I am new to the evo world.
Last edited by SVTerminator28; Jul 21, 2019 at 12:15 AM.
EvoM Community Team Leader
Joined: Aug 2005
Posts: 5,690
Likes: 708
From: West Coast
That sucks about cylinder 4, but it sounds like you have a handle on it. Just a heads up, if the previous owner had installed High-Z (high impedance) injectors then they also would have bypassed that injector resistor pack. If you just put low-Z (Low impedance) injectors in without reconnecting that resistor pack it will damage the ECU.