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4.0L won't start...ignition problem?

1.2K views 9 replies 6 participants last post by  TealJ87  
#1 ·
Well, my Jeep pulled its typical "I won't start" thing this morning (had 8:00am class and I just got out). No clicking counds, nothing. But the interior lights turn on. I had a neighbor try to crank it over while I measured voltages using my mulitmeter. Everything but the ignition wire seemed normal: I read 0.01V from battery to the ignition wire on the starter. So...it's not getting enough juice to start. What do I do? I've replaced the Crankshaft Position Sensor and Camshaft Position Sensor, and it worked for a few days.

Please help as I don't have a reliable vehicle to get to school. Thanks!
 
#5 ·
All connections are good and tight. Here's an update on the starting issue:

After class, I had a couple friends take a look at my Jeep and we were able to narrow the problem down to one (possibly both) of the following two things: starter relay in fuse box is going bad and/or ignition switch needs replacement. The relay is no problem. I can pick one of those up at AutoZone for 6 bucks. But is replacement of the ignition switch very common, especially for older Jeeps (mine's a '97)? Just wondering if anyone else out there has also replaced this switch.

Thanks!:)
 
#7 ·
Thanks for the replies. Hey, I'm not the only Teal-J owner out there!

Once I got to school today and sat through my morning classes, I replaced my ignition switch with a new one from NAPA. After making sure it was plugged in and all screws were tight, I turned the key and it fired right up. So, I'll keep my fingers crossed that the ignition switch was the real problem (I tested my clutch starter safety switch and it didn't seem to be the issue) and we'll see if she starts first thing tomorrow morning. :D
 
#9 ·
FYI: the iginition switch can be bought with the optional wiring as well. In my experience it about 75% switch and 25% wiring failure. I recommend buying the switch but if that does not work and you are sure its ignition/coumn related-go back and shell out for the wiring.

Also-if you jeep is going to get wet or left out in the rain-throw a garabage bag over the steering column at least-it will save you the grief of fighting with potential ignition and turn signal problems from corrosion....the rest of your jeep is fairly resitant to water
 
#10 ·
Another update: I don't want to jinx it, but so far my Jeep starts up without problems. I did have one issue when attempting to start it for the first time yesterday: it wouldn't fire up on the first or second try, but it finally did on the third. I'm guessing that by the third try I had given the fuel enough time to reach the injectors (leaky anti-drainback valve combined with Jeep sitting overnight). Today, I let the system prime itself thoroughly (turned key to 'ON' for about 20 seconds) and it fired right up. So, it looks like the new ignition switch is working and sending the right signals to the right places. Guess I'll be replacing that valve (and fuel filter, while I've got the tank down) in the near future.

I guess it also didn't hurt to have cleaned out the throttle body yesterday afternoon. That thing was pretty dirty :eek: