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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #1  
Old 04-19-2010
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Icon4 Intermitent Spark

Ok ive done my searching to no avail. even across multi other boards no luck. Heres the skinny:

'94 ranger 4.0 OHV auto 4x4

hydrolocked old motor
got new motor out of 96 xploder

put my upper plenum on it and plugged my harness onto it
same exact motor as 94

no spark when turning key over
when turn key off and motor is stil partially spinnin it sparks


wtf?!?!?!

crank position sensor checks out also have spare and no luck

wires all thoroughly checked and no shorts.

get a 111 code (all clear) when doin KOEO test

Also have spare coil and does exact same thing

ANY help would be so appreciated thanks for your time.
Taylor
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Old 04-19-2010
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have you checked the triggerless crankshaft sensor

does the new block have the same firing order as the old 1

check the coil connector for constant voltage
check the coil connector for consistent trigger wire voltage output
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Old 04-19-2010
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have you checked the triggerless crankshaft sensor
Yes
does the new block have the same firing order as the old 1
Yes
check the coil connector for constant voltage
Yes
check the coil connector for consistent trigger wire voltage output
Yes all 4 wires read an initial 12v with key on and drop to 11v when cranking
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Old 04-20-2010
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11 volts when cranking ( not enough voltage )

should be anywhere between 12.8 and 13.6 volts constant

it also sounds like 1 or 2 plug wires are leaking out to the block
( usually plug wires last no more than 4 to 5 years before they start leaking )

have a friend crank the engine over
( use a spare plug, and check each clyinder wire for proper spark )

use the spare spark plug and hold it close to the block

you may have a defective ignition coil

the trigger wire should not have constant voltage
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Old 04-20-2010
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Im leanin towards defective coil. i unplugged the icm and the 3 yellows are still hot when ign is on and its unplugged from icm. Appears the red with green is shorted in the coil pack to the 3 yellows. Same results on my other coil i had for a spare.
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Old 04-22-2010
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So tell me if im wrong but i hear that all 4 wires are suppose to have power when key is on?

Tried swapping a CPS to no avail Still have no idea what is wrong.

Just gonna have to pay the man to figure it out for me it seems.Sucks cause before i hydrolocked my motor it ran, swapped complete new motor in from a running explorer and now it just wont run. The only sensor i had to change was the water temp due to diff style plug.
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Old 04-22-2010
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the trigger wire should only have voltage when the magnet on the harmonic balancer passes under
the trigger sensor.
( that is why it is called triggerless ignition , it no longer uses mechanical parts any more )

you might as well go for the SCREAMIN DEMON ignition coil
since your factory coil is DOA
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Old 04-22-2010
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i almost forgot.

check the continuity of the harmonic balancer sensor
( it might not be getting any power either )
check that 1st
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Old 04-22-2010
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Ive got 2 Harmonic Balancer Sensors i been toyin with both have the same readings when metal passes across it. I just had a brain fart too and though "hey my gfs 01 xploder should have the same coil". Sure enough it did and swapped coils and hers still runs but nada on mine. Im so soo so tired of this ranger already
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Old 04-22-2010
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did you check to see if each 1 of the plugs is getting power

like i said ,, check each spark plug independantly against the block
( have the girlfriend crank the engine over for you ( pull the fuel pump fuse 1st though )

you have to see if the plugs are actually getting power ( each one )

if not ,, then the coil is not getting it`s required power 12.8 to 13.6 volts

find the coil trigger wire and attach a voltage tester light
clamp the alligator clip to the block and the tester needle to the trigger wire
have your girlfriend crank the engine
see if the light flashes constantly
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Old 04-22-2010
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Ok i have checked all 6 plugs and pulled the fuel pump relay out. They do not get spark when engine is cranking. As soon as i or gf stop cranking and the motor is still spinning i get spark.

Also used a test light on the 3 trigger wires and they do not flash when cranking.

I also used another battery on another test, i hooked the starter to a seperate battery so it would not pull power away from the ranger. Still got nada when cranking but spark when its no cranking
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Old 04-22-2010
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it definately looks like your crank sensors are at fault

probably shorted out internally
( the trigger wire should not be constantly powered )

it means that your coil it completely discharged ,, and is not being sufficient time to spool another charge
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  #13  
Old 04-22-2010
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Ah well sucks my womans sohc doesnt share the same sensor to try that. So I just remembered on her 4.0 the red w/ green and the 3 trigger wires where hot when KOEO Doesnt make sense to me. Think maybe the crank pully may have somethin to do with it? That is the one thing i havent tried swapping, it looks exactly the same as my old motor
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Old 04-22-2010
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check to see if the pulley magnet is still there
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Old 04-22-2010
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i checked in google

seems that other people were having the same problem,, it turns out that they were overloading their key rings with too many keys and wore out the lock cylinder
thus grinding off the internal connections

thus resulting in CRANK but no start issue

some people also found out that their key chip was erased by having it magnetized some-how

the coil has an external relay that is powered form the ignition switch

check the ignition relay on the drivers side fuse box

looks like your going to have to take it to the dealer ( sorry )
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  #16  
Old 04-22-2010
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Are you talking about the magnet in the crank position sensor? If so yes its still there in both of them.

Hmm well i dont have but 2 keys on my ring who know what the previous owner had tho but it ran fine for the 3 weeks i had it drunning and driving.

Also my keys dont have chips in them

I did check the icm realy its good also swapped it with new ones for that reason

Dang i guess i gotta have her looked at then
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  #17  
Old 04-22-2010
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pull the drivers side fuse cover

find the ignition coil relay ,, put your finger on it
have your girlfriend turn the ignition switch to all accessories HOT position

you should feel a CHUNK through your finger
( if there is no vibration ) then your ignition relay is not getting any activation power
( ignition switch )
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  #18  
Old 04-22-2010
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Ya ive done that i can hear/ feel it turning on thats not the prob.
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  #19  
Old 04-25-2010
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Still no luck after Ohm testin my cps and other sensors along with wires etc. So since it been not running been finishing my bedliner caps on bed rails and lined interior and installed an alarm, so no one steals it lol. If anyone else has any input id gladly appreciate it thanks
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  #20  
Old 06-06-2010
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Well not to leave another dead unanswered question in the midst if it can help anyone else. So turns out my cps wires where crossed, when my buddys pulled my motor the plug broke so we wired a new one on and put the 2 wires backwards. Runs like a champ now im happy i dont care that it was somethin soooo stupid im just glad its runnin
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  #21  
Old 06-06-2010
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that is good to hear
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