Hello, new to the forum. hope someone can help me.
Just bought a 1994 jeep YJ with a 4.0 and a 5speed. at first this thing was running like a top after sitting in someones yard for a whole winter, no troubles starting or idling. after driving it 60km to bring it home i attempted to start it again, the engine turned over but wouldn't ignite. so i tried again and voila! she lived. this problem has been getting worse and more frequent since that day. it was so bad that you would sit there cranking it for a good minute (bad for the starter, i know) and it would hesitate and sputter until finally it would light up. but once it was running it would run good. now, last night i went to go home from a relatives house and it refused to start. i almost wore down the battery trying to start it. so i began basic diagnostics of her systems. the fuel pump would turn on before this but now there wasnt any life from it. i thought it could be the relay so i tried using the horn relay (after verifying it was functional) to check and still no luck. so i then used some jumper wire and jumped the relay, the pump ran and was sending ample pressure to the fuel rail but it still wouldnt start. i performed the same procedure on the asd relay and still no luck. ive read about the crank sensor and the problems it could cause but i dont think the symptoms match. supposedly the cps will make the dash go nuts and keep a few gauges from functioning but my dash appears fine however there is no engine/battery light when i turn the key on only the abs light comes on, and after a bit it flickers off. but my favorite part of the whole thing is that while i was being towed home i attempted to 'bump start' it. we were doing roughly 10-15mph, i put it in 3rd gear and released the clutch. it started without issue and ran wonderfully. after i got home i turned it off and now it wont start again.
the issue seems to have gotten worse with use, there has been roughly 50 miles put on it since the problem first started and its gotten drastically worse since then. something must have deteriorated. i just need some pointers or find someone who has had the same problems.
would i need an OBD1 reader? id like to avoid having to purchase the reader as im on quite the budget with this jeep. is there a way to check codes with a flashing dash light or something of the sort? i know it exists on other vehicles but im still learning this beasts electrical and have no idea lol
also, i just replaced the engine to body ground wire. the old one was toast. the only problem is i had to move the wire on the block, the head stud it was mounted on was far to corroded for me to take off with simple hand tools so i attached it to where the battery ground attaches and located the other end near by on the fire wall. i ensured there was enough bare metal for a good contact to be made. i reconnected the battery and its still not workin'. im hoping the location of the wire doesnt effect the voltage that the computer (or whatever) requires but im unsure.
i attempted the procedure again, i had done it correctly the first time but i had to double check lol there still isn't any lights coming on besides the abs light. would a faulty cps keep it from showing codes?
it isnt burned out, however, it was coming on intermittently when the ignition was turned on. and for some reason when it was on the jeep wouldnt start so i turned it off and back on again, this time the light wasnt on and the jeep started. but now its not on and it wont start without bump starting it. im starting to think it must be a computer related issue if the engine light wont come on. doesnt the computer directly control the opperation of the dash panel?
So just an update for anyone who is interested lol. came home from work the other day and tried to start it just for shits and giggles and she lit up without any issue at all, it ran good too. all the proper lights came on and the fuel pump ran as it should. however, when i turned it off and tried to start it again it wouldnt start but everything was still working. so i tried to get the codes and they finally showed up. i got 12 and 33 i belive. i dont think either are relevant as the 33 indicated a short or open circuit with the a/c and it doesnt have a/c and the 12 is for the battery being dissconnected within the last 50 key-on cycles. so im still not too sure what the problem is but now im starting to think that it might be a moisture problem. has anyone ever submerged their jeep and had funny starting issues? could it be the computer or possibly a faulty sensor?
Dude, have similar problem for months, mine always starts, but cuts out at random times. Replaced every sensor and replaced 2 of 3 capasitors in computer. Still have problem. I also dont have the cel come on and bulb is good. Not sure if you will get any help here, i havnt. If i find a better site, will keep you informed.
It sounds similar to the ECU issue that quite a few members have experienced. When you turn the key do you ever hear a clicking coming from the relays under the hood? I just changed my capacitors and it works great now. You NEED to do all 3 capacitors at once for it to work correctly though.
ive only heard the relays clicking once, and it happened the first time it refused to start. they havent clicked since. what kind of symptoms do people usually experience when the computer is on the shits? are new capacitors expensive?