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New motor, started, ran great, then no start.....

allstyle12

CEG'er
Joined
May 5, 2006
Messages
329
Location
Sunny San Diego California
Replaced the motor, drove perfect this morning!

Then, I went to change the rear O2 sensor 1, bank one, and the braided ground strap touched one of the ends of the mega fuse, and sparked a bit. Checked the mega fuse and it's fine. 12v at both ends

Put everything back together and now it won't start. Cranks over easy and strong, but nothing.

-I have fuel pressure, fuel comes out the shrader valve
-I have power at the coil, 12v
-I have new cam shaft and crank sensors
-I check every relay, and fuse. All appear to be good

I don't seem to be getting spark. I have fuel at the rails. Took the plugs out and they are dry....shouldn't they be wet?

Did I fry the PCM? I have an extra one, but when I hook it up and try to start it, it won't even turn over.

I was so happy to get her running today, and now this. So bummed....
 
Some additional info...

-Check engine light goes off when cranking
-I see RPMS in the scan tool when cranking

This tells me Cranking sensor is okay....maybe.

I've read that if the ECT isn't reading, that would cause a no spark start condition. I see 64F on that sensor. I have spares so I can try that.

For the other PCM, I presume all I need to do is go to the dealer and have them program my keys....yes?
 
Damn, bro. You've been on here long! Haha.

I have no Pats light....weird.

It's a 98.5 with the SFGO PCM. I have a spare RJL1, but that doesn't crank at all. I was going to have the locksmith reprogram the keys, but I just found out this PCM is not compatible because I have no stand alone PATS.
 
Recheck your harness connections. Main PCM and driver side square.

In addition the big 3 connections on the rear valve cover that connect the injector harness (give them a firm squeezing)

If those check out good, double check your grounds.
 
Fuse 9 in the engine bay. 20amp large fuse with window.

Bingo! That fuse was blown. I figured that out last night! I wish I would have read this post yesterday morning. could have saved me a couple hours.

I hooked up some alligator clips to a fuse and it kept blowing every time I turned on the key.

So I took the battery out, checked a bunch of wires in the harness, took out the harness square, looking for shorts with a multimeter, unplugged harnesses one by one and fuses kept blowing (I have a billion extra fuses).

Lastly, I unplugged the harness to the frayed VSS sensor, put everything back together, now the fuse no longer blows.

I haven't tried starting it just yet, because I put a spare PCM in so I don't fry my original one.

VSS frayed wired maybe were touching, causing the fuses to be blown. I can plug it back in to be sure, as I have fuses to spare.

Pretty easy to change the VSS from underneath?
 
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