2008 f150 5.4
#1
2008 f150 5.4
Crank .no start. No Rpm when cranking. Engine light stays on while cranking. New cam sensors and crankshaft sensors. Wire from sensors back to pcm tested out good. Voltage test at pcm pin was 10v in one wire 3 volts on other crank wire. Pcm disconnected I'm getting a good. 55 volt from the crank senor . When I unplug the cam sensor's I get no voltage or ground . Please help
#3
Yes I have 12 power to coils but no pulse no spark. Good fuel pressure my guess is the pcm is not receiving the signal from the crank to turn on pulse but it's good wired and new sensor. I was told the pcm has to send out a circuit to the crank.
Last edited by Kitfox; 03-09-2020 at 04:39 PM.
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#8
Crank no start 2008 F150
new cam and crank sensors. Wiring fron sensor to pcm tests good. Constant12v to coils and in jectoes with key on. But no pulse spark on cranking. AC voltage from crank sensor while cranking is .42 to .48 I get no Rpms on the dash and check engine light stays on during cranking. I'm getting no codes. Pcm relay checks out good. Is this voltage enough to get the pcm to send out the spark signal. Also fuel press is good
#13
new cam and crank sensors. Wiring fron sensor to pcm tests good. Constant12v to coils and in jectoes with key on. But no pulse spark on cranking. AC voltage from crank sensor while cranking is .42 to .48 I get no Rpms on the dash and check engine light stays on during cranking. I'm getting no codes. Pcm relay checks out good. Is this voltage enough to get the pcm to send out the spark signal. Also fuel press is good
You also need to check ground AT each of the devices.
How are you confirming no pulse at the coil-on-plugs?
I would try squirting starting fluid in, maybe figure out if the fuel delivery is the problem.
#14