95 wrangler yj no spark
- Thread starter Nickg
- Start date
greg92jeepxj
Official Supporter
Hip to be square
Its the 2.5l 4 cyl. And i like the cj hood so much better i dont lile the square headlights of the yj
No headway yet ive been. Usy with work havent gotten a chance to work on it yet
How did you get the crank sensor off? I cant get it off
greg92jeepxj
Official Supporter
I'm famiar with bolts holding the CPS in as well . But reading back in your post stating you cannot remove the CPS because you cannot get it off the two studs got me to research . I don't have proper reference for that year so I turned to google . I don't know if you've got the auto trans but one of the transmissions has a removable metal plate , if I remember right . That would make sense since you would have to move the sensor off the studs . It seems the only way to do that would be to remove a cover to allow that . I wouldn't think a rubber grommet is used in the trans bell housing with studs . I mean , how would one slip the sensor down but engage the bracket on the studs ? Check to see if there is a removable metal cover . This does sound like fun . Sorry .
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Re: Intermitent to no spark 95 wrangler
I got the sensor off, it was a pain to get off but it had a rubber grommit holding it in place. You had to pull out and when you pulled out it pops the grommit off. However when i replaced the crank sensor it didn't do anything the jeep still doesnt start
I got the sensor off, it was a pain to get off but it had a rubber grommit holding it in place. You had to pull out and when you pulled out it pops the grommit off. However when i replaced the crank sensor it didn't do anything the jeep still doesnt start
greg92jeepxj
Official Supporter
Be sure there isn't any kind of anti-theft deterrent system ( factory or aftermarket ) of any kind that could be the cause of ignition system cut-off. Usually those systems also prevent crank as well so this may not be the case . Verify that all fuses are good and look for voltage across terminals with ignition on . Use a test light to the ignition coil post with a gap . Crank engine and look for an arc. Should be steady on/off and strong white spark. If no spark or poor / weak spark , look for voltage coming in at harness connector to coil . The test light to look for volts at coil post secondary should be a heavy duty 12 volt test light but when looking for voltage at harness connector of coil or ANY sensor harness connector , use a computer safe test light .
You never want to draw more than 5 volts from a computer circuit . A 12 volt light will cause computer damage due to over draw. Computer safe test lights aren't too expensive and always good to have . I suggest obtaining one since more diagnostics may possibly be needed relating to computer feedback in this diagnostics . Also , a noid light to test fuel injector pulse will be needed too .
Has fuel pressure been verified key on and engine cranking ?
Also , when the need to use a voltmeter is found , make certain its computer safe too if checking a computer circuit since over draw can occur just by using a meter that draws too much from a computer sensitive circuit . All computer circuits whether a ground circuit or 5 volt reference and signal feedback need to be checked with computer safe equipment to avoid computer damage . Hope all ground connections and all other connections are clean and tight .
You never want to draw more than 5 volts from a computer circuit . A 12 volt light will cause computer damage due to over draw. Computer safe test lights aren't too expensive and always good to have . I suggest obtaining one since more diagnostics may possibly be needed relating to computer feedback in this diagnostics . Also , a noid light to test fuel injector pulse will be needed too .
Has fuel pressure been verified key on and engine cranking ?
Also , when the need to use a voltmeter is found , make certain its computer safe too if checking a computer circuit since over draw can occur just by using a meter that draws too much from a computer sensitive circuit . All computer circuits whether a ground circuit or 5 volt reference and signal feedback need to be checked with computer safe equipment to avoid computer damage . Hope all ground connections and all other connections are clean and tight .
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greg92jeepxj
Official Supporter
Also , as Djs jeep posted , the cam sensor will have to be checked as well .
Youll want to know if it's receiving 12 volt reference and if a signal feedback is present .
Both , the cam and crank sensors have to have 5 volt reference , signal feedback and ground .
Without it , the PCM won't even know the engine is trying to start . Coolant temp sensor voltage and ground needs to be checked or could produce a no start too.
I know that computer safe voltmeters are $$ but we don't want to damage a PCM .
Youll want to know if it's receiving 12 volt reference and if a signal feedback is present .
Both , the cam and crank sensors have to have 5 volt reference , signal feedback and ground .
Without it , the PCM won't even know the engine is trying to start . Coolant temp sensor voltage and ground needs to be checked or could produce a no start too.
I know that computer safe voltmeters are $$ but we don't want to damage a PCM .
JPNinPA
Well-known member
Re: Intermitent to no spark 95 wrangler
Dont know if you have solved the problem yet but i had an issue with my jeep not starting and when it did would die randomly and after a new cpu and cps still did same thing. Come to find out my transmission fuild once changed stoped this. Forgot what it was called i pulled it off trans and was gummed up from the old fluid and additives previous owner put in it. With that clean and new fluid i have not had a problem since. Never thought my atf would stop my car from starting
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Dont know if you have solved the problem yet but i had an issue with my jeep not starting and when it did would die randomly and after a new cpu and cps still did same thing. Come to find out my transmission fuild once changed stoped this. Forgot what it was called i pulled it off trans and was gummed up from the old fluid and additives previous owner put in it. With that clean and new fluid i have not had a problem since. Never thought my atf would stop my car from starting
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Re: Intermitent to no spark 95 wrangler
At least its an easy fix
Sent from my SM-G930T using Jeepz.com mobile app
At least its an easy fix
Sent from my SM-G930T using Jeepz.com mobile app
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