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Engine will not fire up and run?

Tiny
SUGARFOOT10
  • MEMBER
  • 1989 JEEP WRANGLER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 70,000 MILES
Jeep will not fire, after replaceing fuel line to carb. And running the engine I turned it off, put up my tools, went to move the jeep, nothing. There's no current anywhere, lights, dash, radio and clock, nothing. I checked the battery, new solenoid switch and new starter switch, still nothing. I have checked the fuses and they are OK. Is there someway to check the starter relay, the starter switch and coil, just wondering where to start?
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Wednesday, November 10th, 2010 AT 7:26 PM

28 Replies

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
When you turn the key to the on position without cranking the engine over can you hear the fuel pump run in the tank for 5 seconds?

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back. The Medic
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Thursday, November 11th, 2010 AT 1:04 AM
Tiny
LISAVAUGHN
  • MEMBER
  • 3 POSTS
  • 1989 JEEP WRANGLER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 144,000 MILES
Have replaced coil, have voltage to positive on coil, have replaced pick up assembly, have fan working, will crank, will NOT start with crossover battery to coil = all told, NO FIRE to distributor.

Could this be a plug wire, bad grounding to coil, or ignition switch problem? Or something completely different?
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Thursday, September 24th, 2020 AT 6:35 PM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Have you checked the crank sensor?
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Thursday, September 24th, 2020 AT 6:35 PM (Merged)
Tiny
LISAVAUGHN
  • MEMBER
  • 3 POSTS
This year Jeep does not have sensors.

Since my original post, I did check the wire from the center of the coil to the distributor and nothing new happened. There is voltage (12volts)(BUT 0 amps). Into the coil and zip coming out Where does the positive coil wire lead to. Wiring harness? Or straight to switch?
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Thursday, September 24th, 2020 AT 6:35 PM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS


https://www.2carpros.com/forum/automotive_pictures/139033_jeep_1.jpg

this is the wiring schematic to it. hope this helps. note the control unit, check inputs and output to coil.
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Thursday, September 24th, 2020 AT 6:35 PM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS


https://www.2carpros.com/forum/automotive_pictures/139033_jeeps_2.jpg

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Thursday, September 24th, 2020 AT 6:35 PM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Sorry about the sloppy picture, thats the best I can get it
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Thursday, September 24th, 2020 AT 6:35 PM (Merged)
Tiny
LISAVAUGHN
  • MEMBER
  • 3 POSTS
The dark green wire that went from the coil's negative to the electronic carriage unit was the answer - however, I do not know if it just reset and worked after pulled it out and reinserted it OR if it just needed cleaned up for a better connection.

Either way, I have fire!

That schematic was the best, as were you for offering it! Thank you!

What book did that schematic come from? I'd like to buy that one.

For my first use of this site, I'd say the help here was great and worthy of the requested donation!
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Thursday, September 24th, 2020 AT 6:35 PM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Mitchell ondemand 5 is the site I get it from for all vehicles. I think you can get access to a certain vehicle for a small fee. I pay about $200 a month for my shop access.
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Thursday, September 24th, 2020 AT 6:35 PM (Merged)
Tiny
CHANDLER03
  • MEMBER
  • 1 POST
  • 1989 JEEP WRANGLER
  • 4 CYL
  • 4WD
  • MANUAL
  • 11,800 MILES
Yes my engine quit while driving no start back, changed coil, fuel pump, I put a test light on the old coil power was going to coil but none coming out so I changed it, still the same prob, can u help
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Thursday, September 24th, 2020 AT 6:35 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, distributor pick-up coil, ignition control module, cam and crank sensors- Note: If it doesn't apply disregard it
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Thursday, September 24th, 2020 AT 6:35 PM (Merged)
Tiny
JEEPIDIOT
  • MEMBER
  • 1 POST
  • 1989 JEEP WRANGLER
  • 170,000 MILES
89 jeep wrangler 2.5l carbed. Will turn over but wont start. No spark, replaced distibuter, roter, ignition coil, and ignition control modual. Still no spark? Help.
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Thursday, September 24th, 2020 AT 6:35 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Ok, no more throwing parts at it.

Do you have power to the positive side of the coil? If you do, then look for a pulsating test light on the negative side while cranking to see if the coil is being commanded to fire.

If there is no power, you may have a bad ignition switch

roy
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Thursday, September 24th, 2020 AT 6:35 PM (Merged)
Tiny
MACGYVERDB
  • MEMBER
  • 2 POSTS
  • 1987 JEEP WRANGLER
Engine Performance problem
1987 Jeep Wrangler 6 cyl Four Wheel Drive Automatic 100k+ miles

Replaced Cap, Rotor, Wires, Coil, Carb, Control Module (Twice), ignition switch (a few years back). Alternator, Starter.

Start it cold. Runs fine. Drive where you want to. Shut it down. Go into say a store, shop, come back out. Won't start. Turns over, won't start. Wait an hour. Turns over and starts like nothing happened.
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Thursday, September 24th, 2020 AT 6:36 PM (Merged)
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Is this a carb. Have you looked for fire AT PLUGS?
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Thursday, September 24th, 2020 AT 6:36 PM (Merged)
Tiny
MACGYVERDB
  • MEMBER
  • 2 POSTS
This is a carburated system. Changed: Cap, Rotor, Plugs, Wires, Carb, coil, alternator, starter, battery, control module (twice). Ignition switch, O2 Sensor. Had someone tell me that maybe the pickup coil is going bad or has gone bad.
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Thursday, September 24th, 2020 AT 6:36 PM (Merged)
Tiny
PANDRESS
  • MEMBER
  • 1 POST
  • 1987 JEEP WRANGLER
My 1987 Jeep Wragler stopped runnig one day and acted like it was out of gas. I added gas but no luck. A machanic told me it was the fuel pump but I replaced it and it still will not start. I'm moving to the fuel filter. I removed it tonight and it is old but not cloged. What else could it be? It is a 4 clynder with fuel injection. The air filter is good. I have pored gas right in to the carborator and it has turned over whe I do. So I'm pretty sure its the fuel.

How can I check verify that fuel is at my injectors.
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Thursday, September 24th, 2020 AT 6:36 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Get a helper while engine is being crank over -listen to the injector/s with a long screwwdiver, is it clicking?

You can also do this remove 1 or 2 plugs if its wet than its getting fuel-and the problem is coming from the ignition system. No spark!
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Thursday, September 24th, 2020 AT 6:36 PM (Merged)
Tiny
SCOTT FLENNER
  • MEMBER
  • 1 POST
  • 1987 JEEP WRANGLER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 65,000 MILES
I replace the distributor, wires, plugs, ignition and module. I was running bad, now it will not start.
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Thursday, September 24th, 2020 AT 6:36 PM (Merged)
Tiny
AL514
  • MECHANIC
  • 4,692 POSTS
You may have to do a fuel pressure test. Have you changed the fuel filter lately? Also, It is always good to do that during a tune up. The vehicle is a bit older, so you may have to go through and check some other systems in this situation. Did you move the distributor at all during your tune up, possibly putting the ignition timing off? There is a Vacuum Advance Unit on the distributor that controls ignition timing also. The running bad condition could be a few things, so we will have to narrow it down a little at first. Let us know what you find and we will keep checking this thing out so you can get it back on the road.
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Thursday, September 24th, 2020 AT 6:36 PM (Merged)

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