Yet another no spark
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Yet another no spark
1999 F-150 4.2 Auto. Wife at traffic light, said it "stumbled" and died. Cranks good.
Checked fuel pressure- a little over 40 PSI at the rail. Sprayed a little starting fluid and no start.
Pulled a plug wire and looked for spark- none.
Changed out the Crank Pos Sensor for a new one- no spark
Tested resistance across coil pack pairs 2/6 had no reading. changed out coil pack.
Checked voltage to red wire to coil pack when key on and has 12 V.
Looked in oil fill hole and see rockers moving when cranking so not timing chain.
What's the next step? And thank you in advance. Trying to be methodical in my testing.....do not have a code reader.
Checked fuel pressure- a little over 40 PSI at the rail. Sprayed a little starting fluid and no start.
Pulled a plug wire and looked for spark- none.
Changed out the Crank Pos Sensor for a new one- no spark
Tested resistance across coil pack pairs 2/6 had no reading. changed out coil pack.
Checked voltage to red wire to coil pack when key on and has 12 V.
Looked in oil fill hole and see rockers moving when cranking so not timing chain.
What's the next step? And thank you in advance. Trying to be methodical in my testing.....do not have a code reader.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Looks like the PCM is not getting power.
The PCM has to provide ground to the coil packs in the fire order sequence or no spark.
There are fuses depending on your build.
A mini fuse block check #1.
Dash panel check #30.
Relay #6 in Pwr dist. box.
Power dist. box #24.
You need a copy of the owners manuel to have all this info.
Good luck.
The PCM has to provide ground to the coil packs in the fire order sequence or no spark.
There are fuses depending on your build.
A mini fuse block check #1.
Dash panel check #30.
Relay #6 in Pwr dist. box.
Power dist. box #24.
You need a copy of the owners manuel to have all this info.
Good luck.
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We ran a scan on it and no codes ( I had the battery disconnected a couple of hours)and the PCM is communicating. My mechanic friend recommended changing the cam position sensor as well. The coil pack is getting power but no fire signal. I will post up results as I go along.
Thanks again for your replies and ideas. Awesome forum here.
Jim
Thanks again for your replies and ideas. Awesome forum here.
Jim
Thread Starter
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New User
Joined: Jun 2013
Posts: 8
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Looks like the PCM is not getting power.
The PCM has to provide ground to the coil packs in the fire order sequence or no spark.
There are fuses depending on your build.
A mini fuse block check #1.
Dash panel check #30.
Relay #6 in Pwr dist. box.
Power dist. box #24.
You need a copy of the owners manuel to have all this info.
Good luck.
The PCM has to provide ground to the coil packs in the fire order sequence or no spark.
There are fuses depending on your build.
A mini fuse block check #1.
Dash panel check #30.
Relay #6 in Pwr dist. box.
Power dist. box #24.
You need a copy of the owners manuel to have all this info.
Good luck.
Jim
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Hotshot
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From: St Louis
Malfunction Indicator Lamp, aka, the check engine light.
Cam sensors cannot cause a "crank, no fire" symptom although the crank sensor can. Unlike you like wasting money, avoid the urge to replace parts on a whim.
Cam sensors cannot cause a "crank, no fire" symptom although the crank sensor can. Unlike you like wasting money, avoid the urge to replace parts on a whim.
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Is it possible I purchased a defective crank sensor? Is there a test procedure for that sensor and connector I should perform? And.....thanks in advance.
Hotshot
Joined: Jan 2004
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From: St Louis
and the PCM is communicating.
Cam sensor is near the top of the engine. The crank sensor is going to be down near the crankshaft. I'm not familiar with where it is on the 4.2 engines, but some of the V8s it's usually buried under the A/C compressor.
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