Replaced Cam-no spark


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Old 05-03-2017, 08:04 PM   #1
BlueXJJR25
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Default Replaced Cam-no spark

I had another thread going here but I felt it was necessary to start a new one as the "no spark issue" is different from a collapsed lifter and grenaded cam.

I recently replaced the cam and lifters in my 2000 xj with stock replacements; which involved me tearing everything apart and then putting it back together. I changed the fluids and then disconnected the coil pack/spark plugs and kicked it over for a while to prime the system. I reconnected the coils and tried to start it and nothing....

After checking the connection and making sure everything lined up correctly, I removed the coil pack and a couple plugs. Once removed, I put the plugs back in and kicked it over and still nothing-no spark to the plugs.

Here are a couple things I did while putting everything back together (please see pics)

1. Relocated the firewall ground from the rear-most head stud to one closer to the middle of the head which is easier to access

2. There was a wire connection on the head just above the cam sensor/distributor looking thing that I didn't know was there when I removed the head and broke the wire from the connector. I figured it was just a ground so a removed the connector and just reconnnected straight to the bolt
coming off the head. Is this the issue?

3. Removed and repositioned the cam sensor with a toothpick at what I thought was TDC. Would it make spark even if it was out 180 or way off?

4. Noticed another block ground at the resent passenger side block near the other ground. It is covered in oil-could this cause an issue?

Please HELP!!!








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Old 05-03-2017, 08:18 PM   #2
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I think the green wire may be a ground for the oil pressure sensor, not sure.
The cam sensor does NOT control ignition timing, just fuel timing. the ECM controls timing based off the crank sensor. But you still have to have the cam sensor timed perfect. do you know the proper procedure for putting it in? the cam sensor will rotate as you insert it, making getting it a tooth off very easy.
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Old 05-04-2017, 01:01 AM   #3
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I mean I thought I got the procedure right.

(Once the sensor is removed)

Find tdc on compression stroke

Insert toothpick into side of sensor and align it with the hole on the middle piece

Drop it in so it aligns with the oil pump screw

Tighten it down

Am I missing something?

Would the sensor cause no spark at the plugs?
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Old 05-04-2017, 02:50 AM   #4
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Quote:
Originally Posted by BlueXJJR25 View Post
I mean I thought I got the procedure right.

(Once the sensor is removed)

Find tdc on compression stroke

Insert toothpick into side of sensor and align it with the hole on the middle piece

Drop it in so it aligns with the oil pump screw "This is when it will turn and fool you. but be off by a tooth.

Tighten it down

Am I missing something?

Would the sensor cause no spark at the plugs? "Yes"
Here is the ECM startup procedure. Read through it and it will explain what senors the ECM is looking at during startup.






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1996 Cherokee classic. 100k Miles, I6 HO, AW4, Np242, D30/C8.25 3.5" RE lift
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NP242 Hack n Tap (SYE) Install
Common links: Budget MODS List And All You Ever Wanted to Know About an XJ

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Old 05-04-2017, 05:12 AM   #5
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Wow thanks for the info.

So does my "back of a napkin" description of the cps install seem right?

What position should you have the oil pump screw turned to before you drop it in?

Do you put the toothpick in before you drop it in or align it after it drops into the slot?

Anything else I should look at?

Thanks again!!!
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Old 05-04-2017, 03:33 PM   #6
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Quote:
Originally Posted by BlueXJJR25 View Post
Wow thanks for the info.

So does my "back of a napkin" description of the cps install seem right?

What position should you have the oil pump screw turned to before you drop it in?

Do you put the toothpick in before you drop it in or align it after it drops into the slot?

Anything else I should look at?

Thanks again!!!
I understood your description.

The oil pump groove should be at 11 and 5 o'clock. The "toothpick" should be between 4 and 5 o'clock, with 12 o'clock facing the block and 6 o'clock facing your pecker while you lean over the fender. Here is a quick video. hope this helps!

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Old 05-06-2017, 07:56 PM   #7
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Thanks Gluck.

I'm at a complete loss here. I installed and reinstalled the cam sensor unit as specified above three times. I changed the cps, installed a brand new coil pack, and bought a new battery. Still no spark. I'm at a complete loss here and have no idea what the problem is and I'm losing my mind redoing everything over and over.

A couple of things to note.

After the new cam-I have yet to put the front grill/light assembly on. Would that be an issue?

There is a slight gas leak from the mount/bolt assembly which mounts the fuel line to the intake manifold. Would that cause no spark?

I have cranked on the engine for 12-14 seconds periods which gave me a "check gauges" light and a "CEL" but everything then goes away and doesn't prompt a code. Is this normal?

PLEASE HELP
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Old 05-06-2017, 08:04 PM   #8
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Additionally-I only have the valet key. I have heard that the security system might not allow a spark or shut of the ignition; is this true?
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Old 05-06-2017, 08:06 PM   #9
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Gonna have to take a step back and start fresh.

You have coil on plug ignition. How are you determining spark?

Did you disconnect the crank position sensor on the bell housing and forget to plug it back in?

Switch the ASD (auto shutdown relay) with the one for the a/c.
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NP242 Hack n Tap (SYE) Install
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Old 05-06-2017, 08:07 PM   #10
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BTW, yes the security system can shut down ignition.
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1996 Cherokee classic. 100k Miles, I6 HO, AW4, Np242, D30/C8.25 3.5" RE lift
My build thread: Gemini
NP242 Hack n Tap (SYE) Install
Common links: Budget MODS List And All You Ever Wanted to Know About an XJ

December 2013 Stock Class Cherokee of the month
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Old 05-06-2017, 08:21 PM   #11
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I really haven't determined if I have spark or not. I have the coil packs and they say you can't just pull the coil off and plug a spark plug in it and hit the ignition. Are there other ways to test for spark?

How do you go about switching the AC relay with the one you mentioned (sorry I'm on my phone and I can't look at your post and type my response on the same screen!)
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Old 05-06-2017, 08:55 PM   #12
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The ASD relay is in the PDC (power distribution center) which is a fancy name for the fuse box under the hood. just switch the 2 relays in the box.

Here is a link to testing the coil pack, and an explanation of how it works: Coil Rail Testing
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My build thread: Gemini
NP242 Hack n Tap (SYE) Install
Common links: Budget MODS List And All You Ever Wanted to Know About an XJ

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Old 05-08-2017, 08:22 PM   #13
BlueXJJR25
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Thanks Gluck. I switched around the recommended relays but nothing caused spark. Which leads me to today where I still have no spark.

I took out my multimeter and purchased a OBD II reader and this is what I got.

with the key on and the sensors (cps,cps) removed, here are the readings I got:

Crank position sensor: 5.14/0/5.14volts. I'm pretty sure the middle wire is a ground

Cam position sensor: 5.29 and 5.40 volts. I think the middle wire was a ground

coil pack/brick: zero volts across all tongs in the key on position and .17 across the tongs when the starter is turned on. Could this be an issue and does this sound right?

I purchased a fancy OBD II reader today and I got the following codes:

P0122 TPS voltage low
P0340 No camshaft reference present at the PCM

what would you recommend for next steps? I believe the lack of voltage at key on and key start for the coil is an issue. I unplugged the brand new coil pack and tested the OHMs and it checked out alright.
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Old 05-09-2017, 03:20 AM   #14
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I'm at work, but can check later tonight.
I think you need to stick a paper clip in the connector to properly test the Cam and Crank sensors. check the power wire from the alternator to the PDC, make sure the connectors at the ECM are not corroded.
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1996 Cherokee classic. 100k Miles, I6 HO, AW4, Np242, D30/C8.25 3.5" RE lift
My build thread: Gemini
NP242 Hack n Tap (SYE) Install
Common links: Budget MODS List And All You Ever Wanted to Know About an XJ

December 2013 Stock Class Cherokee of the month
May 2015 Modified Cherokee XJ of the Month
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Old 05-10-2017, 09:16 AM   #15
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Thanks Gluck-didn't have a lot of time to look at the jeep last night. I did happen to swap out my amazon purchased cam sensor with a new dorman unit and it cleared the po340 (along with reindexing the sensor/dizzy thing). Still no spark but we'll see. I did buy my crank sensor off amazon as well and I might just replace it with a new one just for comfort


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