PCM location

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Something is wrong with the coil pack. The specifications indicates the primary coils should be 0.5 ohms. You are getting 700 ohms. That is way out of specs. Reconfirm the resistance. If it is out, then you need to replace it.

Weak sparks would not fire easiyl and with prolonged cranking flooding would occur resultng in even more difficult starting.
Was this
answer
helpful?
Yes
No
Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
FANTUM48
  • MEMBER
  • 6 POSTS
Sorry, the coil pack primary side is at.6 to.7ohms. Cam angle senso is seeing battery voltage and the Crank position sensor I can't find any voltage going to it, both tested KOEO.
Was this
answer
helpful?
Yes
No
Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
).6 0.7 is slightly out of specs. They wold firee but the sparks could be weak.

I could not find any information on testing of the crank position sensor.

Both CKP wire goes to the PCM.
Was this
answer
helpful?
Yes
No
Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
FANTUM48
  • MEMBER
  • 6 POSTS
Replaced the coil pack and sill no start.I guess the hunt is on for a bad wire, then replace the PCM. Is this logical?
Was this
answer
helpful?
Yes
No
Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Reconfirm that there is sparking and fuel is being injected into the cylinders.
Ensure the engine compression is within specs.

Since engine has not started for quite some time and if fuel is getting into the cylinders, it could have caused the compression to drop.

Remove the spark plugs and squirt some engine oil into the cylinders and crank the engine briefly to bring up the compression. Do this with the fuel pump or inijectors disconnected to prevent flooding.

Reinstall the spark plugs and retry.

With sparks and fuel being injected into the cylinders, it is hard to accept a PCM fault.
Was this
answer
helpful?
Yes
No
Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
BUMPO
  • MEMBER
  • 1 POST
  • 1997 FORD F-150
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 191,000 MILES
I am getting ready to remove the pcm on this truck 1997 f-150 4.6 liter I not sure exactly where it is the truck is not getting any fire that is why I am changing it, is there any pics you could show so that I am sure I pretty sure but just want to make sure thank you
Was this
answer
helpful?
Yes
No
Friday, November 23rd, 2018 AT 1:57 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Have you run a scan first, there are many reasons why you can loose ignition, check for fault codes first
Was this
answer
helpful?
Yes
No
-1
Friday, November 23rd, 2018 AT 1:57 PM (Merged)

Please login or register to post a reply.

Sponsored links