420A 99 motor swapped into 95 and now no start

[undefined0000]

So, I'm in a doosie here. Met a kid on FB that tracked me down. He bought an eclipse and within 2 days, killed the first motor, so they did a motor swap, and the thing hasn't started since (8 months).

So I go in attacking everything.

Tested CAS/CKP - replaced both
Ignition coil not getting 12v, so I jumped 12v to the middle wire and its getting it because I used a test light to verify current. Still no start.

Fuel pump does prime.

Now, the weird thing is that when trying to crank the engine, there is no change in voltage from what I believe to be the signal wires on both the CAS and CKP.

On the CAS, I get 2v on one wire, 5 on another and one is ground.

On CKP, I was getting like 5v on a wire and 1.4 on another and one was ground.

Had friend crank motor and tested the 2 wires getting voltage for change and nothing. I'm at a loss here.

Another thing is that when replacing the CKP, I really wasn't sure how to wire it, so I tried 2 combos and nothing. Anyone have any info there? Give me pointers here please. I've looked and looked and looked. Even have a Haynes manual available and nothing is matching up (wires or voltage). The car was made in 94 if that helps at all. Thanks!

 

[VelocitàPaola]

The FSM has all the wiring information (Download Useful Files). It sounds like there may be a problem with the PCM. Do you have another one to try?

 

[undefined0000]

The FSM has all the wiring information (Download Useful Files). It sounds like there may be a problem with the PCM. Do you have another one to try?

Thanks fr the link! Hopefully its got what I need.

Don't have another PCM available, but I feel bad for making the kid's dad buy a CKP for $70 and the car still not start. I'll just clean it up nice and have him try to return it.

I'll try to get some pictures on here next time I go over his house to give you guys an idea of what I'm working with here. I can usually get a no-start diagnosed, but this one has me stumped .

 

[jayson427]

You need to find a pin out for the 95 pcm and you might have to switch the wires around because you should have the 99 pcm with the motor to make it run. Which wiring won't be the same for the 95 harness. Also check the asd relay for the fuel pump.

 

[undefined0000]

You need to find a pin out for the 95 pcm and you might have to switch the wires around because you should have the 99 pcm with the motor to make it run. Which wiring won't be the same for the 95 harness. Also check the asd relay for the fuel pump.

See, I thought about that and I didn't really see anything at all about it. I mean we are using the sensors that came off of the old motor (with the exception of the 3rd party CKP which I can't figure out how to wire).

And ASD does what it's supposed to, you hear the relay click and fuel pump prime.

95 harness is what is being used

 

[jayson427]

Doesn't matter about the sensors if those wires don't run to the right spot for the pcm. All you have to do is find the conversion pin out and switch the wires around accordingly. Google it and you will see what I'm talking about.

 

[undefined0000]

I can't find what you're talking about.

I'm not understanding why a re-pin would be necessary because we're using the 95 ecu and 95 harness, unless there is something I'm missing..

 

[jayson427]

My bad I thought you were using the 99 pcm. If you have checked everything then try a junk yard pcm that's the same year. Only other thing I can think of is neutral safety switch. Is it an auto or 5 speed? If you get spark and fuel it has to be the pcm, shifter/ safety switch. Have you tried taking the fuel line off the rail to see if fuel is making it up to the rail or check fuel pressure?

 

[undefined0000]

My bad I thought you were using the 99 pcm. If you have checked everything then try a junk yard pcm that's the same year. Only other thing I can think of is neutral safety switch. Is it an auto or 5 speed? If you get spark and fuel it has to be the pcm, shifter/ safety switch. Have you tried taking the fuel line off the rail to see if fuel is making it up to the rail or check fuel pressure?

well there is no spark. Pulled a plug wire off to listen for arcing and nothing. Also used a timing light and still nothing. Its 5 speed.

 

[jayson427]

So find the pin for the coil on the pcm and see if you get power right out from the clip at the pcm. If no power or ground then swap the pcm and try again. You should be able to trace the wire all the way back if you can't find the info. I'm on my cell or I would post a link for you.

 

[undefined0000]

Alright. I tried following the wires from the CAS and CKP too, but the colors don't match as they do at the sensors. I have a pinout on my computer of the ECU, so I'll have a look at that next. I was pretty sure that the ecu gets signal from the CKP and CAS, then triggers the MFI relay which powers the coil

 

[undefined0000]

nono, its a 420a car, I'm just going off of the diagrams I've been looking at in the books. The 2 relays on the firewall on the driver's side? One is the ASD (Fuel pump is triggered by this relay I believe) and the one to the left of it is labeled as "MFI", I'm 100% sure I'm looking in the 420a section too. If it was a 4G63, I think the car would have been started by now .

 

[jayson427]

Alright my bad. I would try a different pcm that's your best bet. The coil wire is straight forward find the pin and check for power. I've also seen people plug in the vss into the coil. Trace the power wire for the coil and see how far you can get power between that and the pcm. Unless it's ignition related or neutral safety switch I can't think of anything else.

 

[silvreclips]

Do you have power going to the injectors?

 

[undefined0000]

Yes, strangely.

 

[Spooled420a]

Might be a long shot , but did you make sure that the big square plug under the intake manifold was plugged in?

 

[undefined0000]

Where the harness connects to crank, knock and oil pressure sensors? Wouldn't I be getting no power down there at all if it wasn't?

 

[Spooled420a]

sorry, did know if you were underneath the car taking those readings. Thought you took them from up top.