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Unread 12-02-2012, 02:05 PM   #1
benjiridenhour
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1998 TJ Wrangler 
 
Join Date: Apr 2012
Location: copperas cove, texas
Posts: 3
no spark, out of ideas

So basically the background of what happened:
I threw a rod through my oil pan but pretty much dumped my whole third cylinder into the oil pan. So I just counted that engine as a loss, which was a 1998 2.5L engine. I decided to just throw a used 1997 2.5L that was certified good that i found online and had it shipped to me already (I know how many people strongly advise to just do bigger swap, but I am going do one when I get the money) So i have already put the new engine in and can not get a spark with anything that I try we can however get it to crank, just not turn over.

Here's what we've done so far:
-Checked for voltage at the cam position sensor: we got 5V in all the plugs? seems weird that they were all constant even with the jeep just on, not even cranking. We even rotated the engine to try to get the sensor out of the pick up, but it still reads the same. The sensor came off of my old Jeep which was working when it threw the rod, so I assume it is still good?
-We have done continuity checks throughout everything, so no wires were severed and they all match up to the diagram for the connectors going into the pcm.
-I went ahead and replaced the crank position sensor. I looked online and saw that it should show infinite resistance between terminals b and c, but both the old one and new one showed some resistance, not much, but some?
-We swapped the ASD relay with the horn relay and it checked out fine

I am popping some codes: P0123, P0118, P0113, P0463, and P1492. I searched for all of these and I know P0118 is the only one I found that could cause a no spark condition and thats the engine coolant temperature sensor circuit high or something.

I was wondering if the ECM/PCM would work from my 1998 with the new 1997 engine?
Any advice would be helpful. I am a big do it yourself guy, but I am ready to take it to a mechanic!

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Unread 12-02-2012, 04:00 PM   #2
jemello89
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Join Date: Apr 2012
Posts: 16
Chain break?

Coil?
Rotor?
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Unread 12-02-2012, 04:12 PM   #3
benjiridenhour
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1998 TJ Wrangler 
 
Join Date: Apr 2012
Location: copperas cove, texas
Posts: 3
well we were only getting a very small amount of voltage up to the coil. not even a volt. sorry, i forgot to put that in the beginning. but its my old coil and whole distributor assembly from my old engine. i took it apart and the and cap look like theyre in good shape.
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Unread 12-04-2012, 03:32 PM   #4
jemello89
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Idk it sounds like you might have a faulty cap/rotor. Should not have constant voltage to all the plugs.
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Unread 12-04-2012, 03:55 PM   #5
benjiridenhour
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1998 TJ Wrangler 
 
Join Date: Apr 2012
Location: copperas cove, texas
Posts: 3
All the plugs of the cam sensor*, not spark plugs. I'm not getting voltage to the coil, much less the distributor
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Unread 12-05-2012, 06:03 PM   #6
laybackman
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1995 YJ Wrangler 
 
Join Date: Dec 2002
Location: Massachusetts
Posts: 6,074
Quote:
Originally Posted by benjiridenhour View Post
So basically the background of what happened:
I threw a rod through my oil pan but pretty much dumped my whole third cylinder into the oil pan. So I just counted that engine as a loss, which was a 1998 2.5L engine. I decided to just throw a used 1997 2.5L that was certified good that i found online and had it shipped to me already (I know how many people strongly advise to just do bigger swap, but I am going do one when I get the money) So i have already put the new engine in and can not get a spark with anything that I try we can however get it to crank, just not turn over.

Here's what we've done so far:
-Checked for voltage at the cam position sensor: we got 5V in all the plugs? seems weird that they were all constant even with the jeep just on, not even cranking. We even rotated the engine to try to get the sensor out of the pick up, but it still reads the same. The sensor came off of my old Jeep which was working when it threw the rod, so I assume it is still good?
-We have done continuity checks throughout everything, so no wires were severed and they all match up to the diagram for the connectors going into the pcm.
-I went ahead and replaced the crank position sensor. I looked online and saw that it should show infinite resistance between terminals b and c, but both the old one and new one showed some resistance, not much, but some?
-We swapped the ASD relay with the horn relay and it checked out fine

I am popping some codes: P0123, P0118, P0113, P0463, and P1492. I searched for all of these and I know P0118 is the only one I found that could cause a no spark condition and thats the engine coolant temperature sensor circuit high or something.

I was wondering if the ECM/PCM would work from my 1998 with the new 1997 engine?
Any advice would be helpful. I am a big do it yourself guy, but I am ready to take it to a mechanic!
Everyone of those codes have one message; voltage to (fill in the blank) too high. I would guess that your '97 engine's sensors do not like the 98PCM voltage values they are getting.
And the engine controllers are different part numbers for the 97 and 98 model years plus there are ~ 4 different ones for each year with the 2.5.

How about you swap in all the '98 sensor into the '97 engine you replaced the '98 ebgine with?
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Unread 12-05-2012, 06:08 PM   #7
laybackman
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OBDII trouble codes;
http://www.jeepforum.com/forum/f67/d...etails-734714/
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Getting older, I have developed some special skills. I have the ability to cough, sneeze, fart and pee at the same time.

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