dustyinthedirt Posted November 26, 2017 Share Posted November 26, 2017 The truck was running fine but the block had JB weld on the block. After the install I am not getting spark from the coil to the distributor. We switched out the coil as well as what i am suspecting is the module underneath it, from my current daily which i know is good. Still nothing. We used a test light and went from my daily (which is the exact same engine) and tested the same wires on both trucks. They were both similar in responses. I marked the picture so it was easier to explain what we have tested so far to make sure. we have power to the red, ground to the purple, nothing on the brown, ground on the blue, and nothing on the green. the red had power on both trucks. the purple had ground on both trucks. both had nothing on brown The brown has a connector where it goes from two to one under the shrinkwrap on one truck.. i didnt even check that on the other. the blue on my daily pulsed while the truck was running and one the other it stayed solid while the key was turning over. we used a spark detector on the wire from the coil to the distrib. and from the distrib to the 1 cylinder. nothing on each Any advice guys? I am stumped. Thanks in advance for any help Edit: we also checked the fuses and made sure the alternator was hooked up correctly. Link to comment Share on other sites More sharing options...
87MJTIM Posted November 26, 2017 Share Posted November 26, 2017 CPS? If it is bad, then it sends no signal to the ECU. The ECU sends no spark. Link to comment Share on other sites More sharing options...
Eagle Posted November 26, 2017 Share Posted November 26, 2017 We need more info. You said "rebuild," but you mentioned JB Weld on the block. Did you rebuild the original block, or did you build a junkyard engine? If you used a junkyard engine, what year is it from? If it's a '91 or newer, whcih flywheel did you use and whick crank position sensor did you use? Link to comment Share on other sites More sharing options...
DirtyComanche Posted November 26, 2017 Share Posted November 26, 2017 As said, CPS, might not be bad but might not be installed/hooked up right. Or as Eagle implies, wrong flywheel/flexplate. My guess on top of that would be engine grounds, or another wiring harness connect out of place. Link to comment Share on other sites More sharing options...
cruiser54 Posted November 26, 2017 Share Posted November 26, 2017 Those wires at the distributor can be left unhooked and it will run.... As stated, we need more info. Link to comment Share on other sites More sharing options...
dustyinthedirt Posted November 26, 2017 Author Share Posted November 26, 2017 The engine is from another Comanche i bought same year and model. Sorry for the confusion. I just stripped the old block with the JB weld on it and put all that stuff onto the rebuilt motor since the old motor was actually running good just busted. The cps is new. it is not a high altitude one, nether was the old one. I haven't tried reinstalling the old cps yet. Could the cps be bad from the factory? I cannot find any loose connectors or grounds but i possibly could be looking in the wrong places. I'm sure its something simple i am missing but i am udderly stumped The only things i replaced are the injectors to the four port, knock sensor, o2 sensor and the cps. everything else is what came off of the old motor straight to the rebuilt Link to comment Share on other sites More sharing options...
cruiser54 Posted November 26, 2017 Share Posted November 26, 2017 Test the CPS. http://cruiser54.com/?p=50 Link to comment Share on other sites More sharing options...
dustyinthedirt Posted November 26, 2017 Author Share Posted November 26, 2017 Alright I'm gonna test it and will update Link to comment Share on other sites More sharing options...
dustyinthedirt Posted November 26, 2017 Author Share Posted November 26, 2017 I replaced the new cps with the old one. And nothing. I do not have a ohm meter and my multimeter doesn't do amps for some reason. So I'm on my way to but one. I had a Mechainical oil psi gauge hooked up. And thought that could cause problems with the sending unit not being hooked up so I replaced that as well Link to comment Share on other sites More sharing options...
cruiser54 Posted November 27, 2017 Share Posted November 27, 2017 Slow down on firing the parts cannon at your Jeep and do some diagnostics. The meter you need is $5 at Harbor Freight. Link to comment Share on other sites More sharing options...
carnuck Posted November 27, 2017 Share Posted November 27, 2017 Slow down on firing the parts cannon at your Jeep and do some diagnostics. The meter you need is $5 at Harbor Freight. Or free with a coupon if you buy something else, like this past weekend. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
dustyinthedirt Posted November 28, 2017 Author Share Posted November 28, 2017 Hahaha thanks for worrying Crusier. I had most of these new sensor already before getting the motor back from the builder. Which this is off topic but it took the guy almost 6 months to do?! it got machined within the first week then set on a stand in the corner under a cover while these other big cubic inch motors where in and out in the same week. I guess i wasnt trying to go fast enough or something Back to the problem. I went back over the whole harness from where it leaves the fire wall to the passenger side of the engine bay. I do not see any wires that have missed. I got a newer meter from harbor freight (mine was found/bought at a pick a part a few years back) and i must not be using it right because no matter what setting i am on when i spin it over i am getting nothing. now i know this is a useless post, i am just trying to keep everybody updated that has offered help. I am gonna ask a co worker to come over and help me figure this out. I just wanna hear it run!! Link to comment Share on other sites More sharing options...
cruiser54 Posted November 28, 2017 Share Posted November 28, 2017 Are the wires soldered or butt connectored? Link to comment Share on other sites More sharing options...
DirtyComanche Posted November 28, 2017 Share Posted November 28, 2017 Your Horror Fraught Tools meter might be DOA. It happens. Will it show you voltage when you put it on the battery terminals? Link to comment Share on other sites More sharing options...
cruiser54 Posted November 28, 2017 Share Posted November 28, 2017 6 minutes ago, DirtyComanche said: Your Horror Fraught Tools meter might be DOA. It happens. Will it show you voltage when you put it on the battery terminals? Ooooh. I like that better than Hobo Freight. Link to comment Share on other sites More sharing options...
DirtyComanche Posted November 28, 2017 Share Posted November 28, 2017 1 minute ago, cruiser54 said: Ooooh. I like that better than Hobo Freight. I'm going to have to use Hobo Freight as an alternate though. Link to comment Share on other sites More sharing options...
Ωhm Posted November 28, 2017 Share Posted November 28, 2017 Harbor Junk, great place for cheap gifts. HO HO HO. Check the battery in the meter. Link to comment Share on other sites More sharing options...
DirtyComanche Posted November 28, 2017 Share Posted November 28, 2017 1 minute ago, Ωhm said: Harbor Junk, great place for cheap gifts. HO HO HO. Check the battery in the meter. The leads on Chicom garbage like that often are supplied open, to protect the meter and you from actually accomplishing anything. Link to comment Share on other sites More sharing options...
dustyinthedirt Posted November 28, 2017 Author Share Posted November 28, 2017 7 hours ago, cruiser54 said: Are the wires soldered or butt connectored? they were butt connected and i went back last night as i was following the harness and anything that looked sketchy or even butt connected i soldered and shrink wrapped. My meter shows i have voltage coming from the battery. Link to comment Share on other sites More sharing options...
cruiser54 Posted November 28, 2017 Share Posted November 28, 2017 Butt connectors are worse than the C101!!!!! Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 28, 2017 Share Posted November 28, 2017 15 hours ago, DirtyComanche said: The leads on Chicom garbage like that often are supplied open, to protect the meter and you from actually accomplishing anything. If people would stop buying the garbage at Harbor Junk it would dry up and go away. I've never been in one and it's number one on my spam list. Link to comment Share on other sites More sharing options...
dustyinthedirt Posted December 1, 2017 Author Share Posted December 1, 2017 Alright I got it to run!!!! After I redid all the connections and cleaned the grounds it fired right up. Actually fired up on the second rotation of the engine with one of the spark plugs pulled out. I had not tried to start it since I changed all of those connections I wanted to wait till i had a extra hand to read the colt meter. My co worker came by and took one of the plugs out and asked me to turn it over to see if it wasn't getting spark and bam! Now she's purring like a walrus. Thank you for all the help!! Link to comment Share on other sites More sharing options...
cruiser54 Posted December 1, 2017 Share Posted December 1, 2017 Hallelujah!!!! Speaking of extra hands while using a voltmeter, check this out. do it by yourself with your smart phone and bluetooth. http://www.southwiretools.com/tools/tools/13090T Link to comment Share on other sites More sharing options...
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