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crank but no spark after engine swap

sam klassen

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I put a 1999 engine in my 1994 for ranger its a 4L 2wd. I'm getting gas in the cylinders my ecm has power my icm has power. The truck has been sitting outside for a year or two. any ideas plz let me know thx.
 


Angie

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is a 1999 OVH or the second gen 4L? you have the correct plug fire order?
 

sam klassen

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i have the correct order but no spark I'll try to find whats in the 1999 rangers
 

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only reason asking is to make sure the plug and play is correct, and the engine block is same. I am sure it is. have you pulled a plug wire off and grounded it to see a spark grounds to make sure you have no spark? all 6? guessing all plugs to sensors are proper and tight? do you have a voltmeter? you may need to check the power going into the dis box.
 

sam klassen

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Yea I've checked for spark. I have a voltmeter. Ya I have power going into the dis box
 

Angie

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is the crank sensor/timing sensor down on the block's bottom end in place?
 

sam klassen

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Yes and it has the 0.9 v ac or whatever it's supposed to have
 

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not sure what to suggest next. moisture in the dis box? any chance you can try a different one to see if that fixes the firing? i will venture to guess the truck was running ok a year back? I am not good at these type of troubles, as i will just swap out parts from my parts trucks until i connect with something. It is easy to over look the obvious is why i was asking the easy questions about relays sensors and plugs.

there will be a suggestion soon from someone who can give more details past the basics. cheers
 

sam klassen

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so i connected a new ignition coil (not installed just to check) and i got spark. went and put it in proper connected it and now no spark again. any ideas?
 

RonD

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1994 and 1999 4.0ls have different spark systems

1990-1994 used a separate spark module, EDIS-6
Self contained, has 3 parts, Crank sensor, EDIS module and the Coil pack, doesn't need the engine computer(PCM) to start spark
Does need the PCM for spark timing under load

1995-2000 has the EDIS inside the computer

After cranking engine over pull out a spark plug, see if its Tip is wet with fuel, if so then Crank sensor pulse is working and making it to the PCM(fuel control)
If Tip is dry then no Crank sensor pulse, or no fuel in the system

12v at coil pack and EDIS-6, this must be full time Key On 12volts, some 12v wires have power cut when cranking engine over
So 12v key on
But no 12v when cranking

The odds of a bad coil pack are long, there are 3 coils in the pack, one failing happens but engine would still start, and miss badly, lol, even with 2 bad coils it would still Fire, but maybe not run
No Spark at all means no power at coil park, or no Ground pulse from EDIS-6 or PCM
 

sam klassen

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You read my last comment right so I have gotten spark but I don't now. I know my icm is good (that's the edls or whatever) I've checked my crank sensor it's good and I am getting fuel In the cylinder.
Thanks for the help thus far!
 

RonD

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Crank sensor, "ICM", and coil pack, thats all there is

If you have good spark then all 3 are working, if you don't then one is NOT working, simple as that, its not a complicated system(1990-1994), has no connection to anything else that would stop spark

"I am getting fuel In the cylinder", did you pull a spark plug to see this?

How are you testing for spark?
Its a waste spark system so "spark testers" don't work well
Timing light will show spark pluses
Use jumper cable to battery negative and clamp spark plug in the other end, the metal part, then put spark plug wire on it and crank engine over, should get fast Blue spark, sparks once per revolution of crank
 

sam klassen

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Yes I took the spark plug out and my problem is more complicated than you think because everything works its some wire that's not working somewhere I think I've found it
 

RonD

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Good

Only wires that can effect spark are 12v and ground at "ICM" or wires from crank sensor
 

sam klassen

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And wires to the coil I did find one that was connected to one of the three yellow wires I have removed it still no spark I will look it over maybe i forgot to plug something back in.
The other comment sounded a bit rude sorry about that.
I'll let you know if I find something
 

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