1997 Tacoma 2.4, No Spark, No Start, Can't Solve. Impossible Fix?
I've been working for months to fix this no start / no spark / no fuel pump situation on my 1997 Tacoma. This is what we know:
No ODBII Codes.
No Rodent Damage.
Distributor is rotating.
Body Grounds Good. Kick panel grounds good. Sanded contacts and body contact points.
Rebuilt Battery to Body Ground Wire.
Battery, 6 months old.
New Crankshaft sensor. Sensor is within Ohms range.
New Ignitor Coil. Tested 4 different coils. No change.
New Distributor (coil, condenser)
New Distributor Cap.
New Distributor Wiring.
Tested NGK coil, no change.
New and verified working EFI relay.
Fuses under hood verified intact and getting power.
Fuses driver side fuse box verified intact and getting power.
Donor wiring harness (Junkyard wiring harness).
Donor ECU swap. Didn't change no start condition.
Getting power to distributor.
Getting power to coil.
Cannot get spark with pull up / pull down test.
Cannot hear fuel pump activating. Seems to be sending fuel though system (strange).
If anyone has any more places to look, I would really appreciate any suggestions. I feel that having the truck towed off is the next step, I sure some of you are familiar with that 'I give up' feeling. The toyotanation forums even gave up on me!
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Do you have power on sensors?
That is what we name 5v ref. This tell you PCM is energized and internal voltage regulation is working.
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Scope, wiring diagrams, amp clamp, secondary ignition test probe.
Assuming here engine is cranking, isn't it?
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- John Curtis
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Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
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The ECU is sending the ignitor coil a signal and Im getting the signal at the ignitor coil plug. This doesnt make any sense as to why the brand new ignitor coil wouldnt be firing.
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How do you know ecu is sending firing signal? Although we know you changed some parts, we need to assume you have tested nothing
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While cranking, you can see spark jumping to ground.
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I need to test this while cranking. Ill let you know the voltage.
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Is this value significant?
And yes, i tested the spark test method with a spark plug touching the valve cover. No spark seen while cranking.
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If injector are not firing, neither spark plugs we should focus on if crankshaft signal is getting PCM.
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I know the injectors arent firing. I smell no raw fuel in my tail pipe after cranking.
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