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Unread 08-14-2014, 08:48 AM   #1
aroundincircles
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No spark - 89 4.0l

So My jeeps been sitting for a couple of weeks waiting for me to get around to replacing the water pump/lower radiator hose. I went out last night to start it to move it so i would have room to do the work, and it wouldn't start. It cranked just fine, Fuel pressure was good, but I have one of these:
http://www.harborfreight.com/inline-...html?hftref=cj
and when I crank, the light doesn't light up.

I was having an intermittent long crank before start, before this, but I replaced the fuel pressure regulator that was leaking and thought I had resolved it, but a few days after I did that I had a cooling issue, so I parked it till I could get around to fixing that, so I only drove it a couple of times.

Does anybody have any suggestions on what to check to see if my ignition coil is grounded properly, or if it is going bad?

Also could a bad CPS be the culprit? would it stop all spark from going to the distributor?

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Unread 08-14-2014, 10:38 AM   #2
jakelloyd55
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Ive heard sometimes you can unplug the cps and reconnect it and it work. But yes its probably that. They really such getting off. Youll need about 3 feet of ratchet extensions.
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Unread 08-14-2014, 11:26 AM   #3
JeepinInJackson
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If camshaft positioning sensor is bad it won't send spark you can try knocking on it or unplugging and replugging it to see if it will work. Also check fuses and relays to make sure none have gone bad.
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Unread 08-14-2014, 04:12 PM   #4
cruiser54
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Quote:
Originally Posted by JeepinInJackson View Post
If camshaft positioning sensor is bad it won't send spark you can try knocking on it or unplugging and replugging it to see if it will work. Also check fuses and relays to make sure none have gone bad.
Renix has no camshaft position sensor. Go unplug the harness into your distributor and see if yours starts.

No fuses or relays will cause no spark.

TEST the CPS by clicking on the link in my signature and going to Post 7.

I would also recommend doing Post 4 just because.
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If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 08-14-2014, 04:25 PM   #5
JeepinInJackson
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Oops I thought he had a 99 I reckon I should read a little closer shouldn't I? Well do you have fuel getting to the engine?
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Unread 08-14-2014, 04:30 PM   #6
cruiser54
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Originally Posted by JeepinInJackson View Post
Oops I thought he had a 99 I reckon I should read a little closer shouldn't I? Well do you have fuel getting to the engine?
You're losing it Jackson!! You BOTH have 89s. LOL.

You need to be working on my Tips yourself!!
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 08-14-2014, 04:45 PM   #7
aroundincircles
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Quote:
Originally Posted by cruiser54 View Post
Renix has no camshaft position sensor. Go unplug the harness into your distributor and see if yours starts.

No fuses or relays will cause no spark.

TEST the CPS by clicking on the link in my signature and going to Post 7.

I would also recommend doing Post 4 just because.
Thanks Cruiser, I read it, but I don't quite understand this part:
"Unplug the harness connector from the CPS. Using your voltmeter set on AC volts and probing both wires in the connector going to the CPS, crank the engine over. It won’t start with the CPS disconnected."

So I probe the plug that is physically attached to the CPS, and i should get a voltage coming off of it?
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Unread 08-14-2014, 04:47 PM   #8
cruiser54
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Yes. The CPS generates a signal. An AC voltage signal.
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 08-14-2014, 04:59 PM   #9
aroundincircles
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Perfect. I don't always understand stuff when I see it. I will try to record what I do when I do it, so there is a video, that way you can tell me if I do it wrong.
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Unread 08-14-2014, 05:25 PM   #10
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Quote:
Originally Posted by aroundincircles View Post
Perfect. I don't always understand stuff when I see it. I will try to record what I do when I do it, so there is a video, that way you can tell me if I do it wrong.
Okay.
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 08-14-2014, 07:23 PM   #11
JeepinInJackson
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Cruiser-I know if I'd read it and noticed he said 89 I would've commented that I had one too lol and yes I already bookmarked that tips page and will be starting that list soon. Right now I am in process of completely rebuilding the brake system, PO had removed everything to do with rear brakes except the cylinders, also the front brake line going from the master cylinder to prop valve is gone and the part it screwed to is rusted and no good, doesn't even leak so just replacing it all.
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Unread 08-14-2014, 07:40 PM   #12
cruiser54
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I know. Just messing with ya!!
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 08-14-2014, 10:59 PM   #13
aroundincircles
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Putting together the video and uploading now. will post when its done.
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Unread 08-14-2014, 11:55 PM   #14
aroundincircles
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https://www.youtube.com/watch?v=Lo36B9wQXy4

Video of my test, did I do it correctly?

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Unread 08-15-2014, 06:50 AM   #15
cruiser54
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You're testing it correctly. There is no polarity to be concerned about.

I'm concerned that your meter may not be the correct one to use in this application. You're looking for .5 AC volts....

And BTW, the zip ties are a great fix for broken off plug retaining clips.

Excellent video BTW. If you do another one with a digital meter, I think we could use it to help others.
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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