please help my tj wont fire

[chops]

i need help my tj wont fire up it will turn over but not start it shows no fuel or power in the bat but has plenty in both can anyone help me ?

[xj]

fuel getting to the injector rail?

[TJ]

Don't take it the wrong way, but you need to provide more information for anybody to help. Was it working okay and all of a sudden does not start anymore? Or it was parked up for a week, month, year (or even longer) and its not firing up now. Have you checked the basics like fuel pump is priming and fuel is reaching the rails.

[sig]

hmmm jeep wont fire ,try using matches and some petrol normally makes things fire pretty good

[chops]

Don't take it the wrong way, but you need to provide more information for anybody to help. Was it working okay and all of a sudden does not start anymore? Or it was parked up for a week, month, year (or even longer) and its not firing up now. Have you checked the basics like fuel pump is priming and fuel is reaching the rails.

right it was going fine had just over 1/4 tank of fuel then parked it up for about 3 hours while shopping then when i went to start it there was no fire it was turning over and sounded dry ie no fuel also the volt reading gadge said 0 but everything works as for if any fuel is making it to the injector rail or fuel pump how do i check this thanks

[mercutio]

i'm guessing it is an electrical problem of some sort but that is just a guess

[Sadam_Husain]

My mate had a couple of those square looking cheroke things and they were both forever in the shop getting the electrics and computers sorted out.... would always breakdown at the wrong time he brought a Saf in the end


didnt mean that to sound like I'm knocking jeeps but thats what he used to find

[chops]

i'm guessing it is an electrical problem of some sort but that is just a guess

i think the same as the fuel and batt gage are dead but should show something i have checked asll the fues and all seam to be in order

[chops]

My mate had a couple of those square looking cheroke things and they were both forever in the shop getting the electrics and computers sorted out.... would always breakdown at the wrong time he brought a Saf in the end


didnt mean that to sound like I'm knocking jeeps but thats what he used to find

far enough mine has been a saint and this is the only problem i have had that has not come from me breaking it while offroad lol

[TJ]

right it was going fine had just over 1/4 tank of fuel then parked it up for about 3 hours while shopping then when i went to start it there was no fire it was turning over and sounded dry ie no fuel also the volt reading gadge said 0 but everything works as for if any fuel is making it to the injector rail or fuel pump how do i check this thanks

Sit inside and listen carefully when you initially turn the key to "on" position. You would hear the fuel pump whine for a few seconds while its building pressure. If there is no sound, fuel pump might not be working as intended.

Although, have you tried jumping it with a working battery? Batteries can die and not have enough life to fire it up, but still keep enough juice to make other things seem to be working. Check battery terminals as well (something might not be tight enough).

I wouldn't worry about the PCM or anything (these things are not as fragile as non-Jeepers think).

[xj]

have you checked the fault codes? click the key full off to full on 4 times and you should get a 21 show up on the odometer, followed by another random number if theres an issue, and finally 55 will come up to finish the diagnosis.

wifes TJ did a similar thing and it was the crank sensor. try it and see what comes up.

[vitara888]

The crank position sensor is known to fail and then there is no spark. Get an auto electrician to scan the computer codes and see if there are any errors.

[Fen]

What about a relay? Is there one that controls the fuel pump?

Is it new enough to have an immobiliser? It sounds like classic dodgy security gear.

[TJ]

Some TJs don't comply with that key turning trick (I know mine doesn't). I have a OBD II reader. I am not in Tauranga or could have used it to read codes (if any reported).

[chops]

have you checked the fault codes? click the key full off to full on 4 times and you should get a 21 show up on the odometer, followed by another random number if theres an issue, and finally 55 will come up to finish the diagnosis.

wifes TJ did a similar thing and it was the crank sensor. try it and see what comes up.

i just tried this and nothing came up it just looked like it would nomaly without fuel or bat gadge agin

[Sadam_Husain]

also the volt reading gadge said 0

Your going to have to find out why its reading 0 volts before it'll go again?

[chops]

right it was going fine had just over 1/4 tank of fuel then parked it up for about 3 hours while shopping then when i went to start it there was no fire it was turning over and sounded dry ie no fuel also the volt reading gadge said 0 but everything works as for if any fuel is making it to the injector rail or fuel pump how do i check this thanks

Sit inside and listen carefully when you initially turn the key to "on" position. You would hear the fuel pump whine for a few seconds while its building pressure. If there is no sound, fuel pump might not be working as intended.

Although, have you tried jumping it with a working battery? Batteries can die and not have enough life to fire it up, but still keep enough juice to make other things seem to be working. Check battery terminals as well (something might not be tight enough).

I wouldn't worry about the PCM or anything (these things are not as fragile as non-Jeepers think).

okey i cant hear any noise apart from the cd stacker starting up and as for the using a better bat i had state plug into it than try and still no luck

[TJ]

What about a relay? Is there one that controls the fuel pump?

Is it new enough to have an immobiliser? It sounds like classic dodgy security gear.

Factory immobiliser was/is built into the key (Sentry Key). I am not sure which year this was introduced in.

Chops, try turning the key to on while pressing the trip meter knob. Some TJs used that trick for displaying codes. BTW which year is yours? 2000+ have different ignition system (no spark plug cables - they use coils packs on rails directly).

[chops]

What about a relay? Is there one that controls the fuel pump?

Is it new enough to have an immobiliser? It sounds like classic dodgy security gear.

Factory immobiliser was/is built into the key (Sentry Key). I am not sure which year this was introduced in.

Chops, try turning the key to on while pressing the trip meter knob. Some TJs used that trick for displaying codes. BTW which year is yours? 2000+ have different ignition system (no spark plug cables - they use coils packs on rails directly).

just to let you know my tj is a 1996 i know this seams wrong it was an early 1997 Tj send for a dealership in new zealand it is thought to be the first Tj to be regested in nz in late dec 1996

[vitara888]

There is a relay in the fusebox under the bonnet for the fuel injection that can fail as well. There is an identical relay for the horn and if the horn works swap the relays and see if it starts.

[chops]

What about a relay? Is there one that controls the fuel pump?

Is it new enough to have an immobiliser? It sounds like classic dodgy security gear.

Factory immobiliser was/is built into the key (Sentry Key). I am not sure which year this was introduced in.

Chops, try turning the key to on while pressing the trip meter knob. Some TJs used that trick for displaying codes. BTW which year is yours? 2000+ have different ignition system (no spark plug cables - they use coils packs on rails directly).

just tried this with the keys and the trip meter and got these numbers

0123456789 dose anyone know what this means or if i have read it corect they flashed up with all 0's than all 1's etc etc

[chops]

There is a relay in the fusebox under the bonnet for the fuel injection that can fail as well. There is an identical relay for the horn and if the horn works swap the relays and see if it starts.

tried this still no go

[TJ]

Okay back to basics. You need spark (electrical), fuel and air for it to run. As long as air filter is not completely choked, that part should be fine.

Try with a bit of engine starting fluid in the throttle body and turn over. If it starts and dies, you have fuel problem. Otherwise likely to be electrical. Although fuel problem could eventually still be eletrical!!!

Other thing, lie under the gas tank and get a friend to turn the key to "on". If you hear something or feel something with you hand on the tank skid plate. Fuel pump is working.

Are other gauges working? Display going from 0s to 9s and stuff is just self check of the gauges. Give it time and it might show codes after a little while.

[chops]

okey tried crc engine start in air intake and lots of it lol no change and whent under and felt the fuel skid plate but could not hear or feel anythig and as for the dash still the same with no movement on the fuel and bat so i will give jeep a call in the morning to see what they say and go from there thanks for all your input everyone and if you have any more im keen to try it ill let you know what it is when i find it but please keep the ideas coming i want to try and not take it in to the jeep service center as they are $$$$$$$$ but will do if need be

[chops]

o and all other gadges are working when i try to start up

[meatc]

There are some electrical issues if you have gauges that were working no longer showing any sign of life. Hate to state the obvious but have you pulled the fuses, in particular the ecu and fuel pump ones. Chances are there is a power issue somewhere. Pull a plug and see if you have spark on turn over. Could also be as simple but hard to find as a loose earth somewhere under the dash.

[chops]

There are some electrical issues if you have gauges that were working no longer showing any sign of life. Hate to state the obvious but have you pulled the fuses, in particular the ecu and fuel pump ones. Chances are there is a power issue somewhere. Pull a plug and see if you have spark on turn over. Could also be as simple but hard to find as a loose earth somewhere under the dash.

i have tried the fuses with no luck i have not pulled a plug but will try this tomor when there is more light

[TJ]

There are some electrical issues if you have gauges that were working no longer showing any sign of life. Hate to state the obvious but have you pulled the fuses, in particular the ecu and fuel pump ones. Chances are there is a power issue somewhere. Pull a plug and see if you have spark on turn over. Could also be as simple but hard to find as a loose earth somewhere under the dash.

I agree, it seems to be electrical problem. Check as many connections and fuses as you can. Take the connectors off, clean them and put them back on. Bad earth is also very likely cause somewhere, but the question is where!!

Good luck and keep us posted.

[chops]

There are some electrical issues if you have gauges that were working no longer showing any sign of life. Hate to state the obvious but have you pulled the fuses, in particular the ecu and fuel pump ones. Chances are there is a power issue somewhere. Pull a plug and see if you have spark on turn over. Could also be as simple but hard to find as a loose earth somewhere under the dash.

I agree, it seems to be electrical problem. Check as many connections and fuses as you can. Take the connectors off, clean them and put them back on. Bad earth is also very likely cause somewhere, but the question is where!!

Good luck and keep us posted.

Right i talked to the head mechanic here in tauranga and he thinks it may be electrical in the ingnition as all the other gages work when turning on etc. And cause of its age this sounds about right to him. I also tryed to start it tonight with some more engine start and it tried to go so the spark plugs are working and the air intake is as well, so the only thing missing is the fuel. From what jeep where saying that the ignition has to make about 6 switches work at once and if one is not conectiong you will get no go with your motor and this will not show up on a dio test with the key trick. Also he said that this could be up to a week to fix as parts have to be shipped in if this is the problem and they cant look at it till friday or monday so its getting towed tomor and with any luck they will find time and the problem and get it fixed before next weekend when im off to play in the mud at an airsoft event Ill keep you all informed as i know more

[yeti]

try these guys for parts chops.. http://www.hitechautoparts.co.nz/index.html .. have dealt with them a few times now and all good mate