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-   -   4.0 randomly dying at stops. (http://www.wranglerforum.com/f210/4-0-randomly-dying-at-stops-154441.html)

TJe0454 04-18-2012 05:34 PM

4.0 randomly dying at stops.
 
as the title says, my engine has been hard starting and dying when cold. also sometimes when at a complete stop. i seafoamed it a week ago. is it possible that caused the issue? just replaced spark plugs because i thought they had been fouled by the seafoam. cleaned throttle body and MAF sensor. thoughts?

maybe bad compression in a cylinder? i just dont know why it would surface now...

Georges98TJ 04-18-2012 06:15 PM

May be the crank sensor try to get it to autozone and have them pull the codes

JDsDream 04-18-2012 06:51 PM

Is the CEL on? If so pull the codes and post them up here.
If not, it could be a number of things. ( clogged/dirty filters, bad fuel)

TJe0454 04-18-2012 10:12 PM

its not throwing any codes

Fitzey5435 04-18-2012 10:40 PM

Change the distributor cap and rotor. Moisture is makin you chug and stall out. Sounds like misfire.

TJe0454 04-18-2012 11:02 PM

mines an 01. no distributor.

TJe0454 04-18-2012 11:34 PM

i got the alternator and battery tested when it first started acting up. alternator was good, battery needs to be replaced apparently. i did do some heavy winching a week or so before this all started up...

Blackpony04 04-19-2012 01:52 PM

I've been fighting similar issues and since you didn't specifically mention it be sure to check your IAC.

TJe0454 04-20-2012 09:20 AM

my mistake: i cleaned the throttle body and sprayed cleaner into the IAC. i guess ill take the IAC apart and give it a good cleaning now.

Jerry Bransford 04-20-2012 10:43 AM

Quote:

Originally Posted by TJe0454 (Post 2282398)
i guess ill take the IAC apart and give it a good cleaning now.

Removing the IAC and giving its plunger and the oriface in the throttle body it fits into a good cleaning is your next best step. Use some aerosol throttle body cleaner and an old toothbrush on the IAC. For the oriface in the throttle body, use a baby bottle nipple brush.

Don't push/pull/spin the IAC's plunger.

TJe0454 04-21-2012 11:12 AM

gave the IAC a good cleaning. still stalling out :(

Jerry Bransford 04-21-2012 11:18 AM

Does the engine rev up from idle smoothly if you apply the gas slowly and smoothly? I'm beginning to think TPS (throttle position sensor) now.

TJe0454 04-21-2012 11:45 AM

Quote:

Originally Posted by Jerry Bransford (Post 2286477)
Does the engine rev up from idle smoothly if you apply the gas slowly and smoothly? I'm beginning to think TPS (throttle position sensor) now.

yep. no issues there.

Fitzey5435 06-05-2012 11:28 PM

Your plugs aren't gapped properly.

I know most will argue with me on this one but I am learning the hard way

cork1958 06-06-2012 06:13 AM

Quote:

Originally Posted by Fitzey5435 (Post 2442505)
Your plugs aren't gapped properly.

I know most will argue with me on this one but I am learning the hard way

Probably would've been my guess after having cleaned the throttle body.

NEVER ever trust the gap on plugs out of the box!

ah110 06-08-2012 07:43 PM

same thing happened to me. what s nightmare.

replaced tthe O2 sensor, still stalled.

replaced the throttle body sensor. still stalled.

ended up being the fuel pump and throttle body sensor combination.

Fitzey5435 06-09-2012 06:07 PM

Quote:

Originally Posted by Georges98TJ (Post 2275202)
May be the crank sensor try to get it to autozone and have them pull the codes

I am also starting to believe that the Crankshaft Position Sensor serves a much greater role in the proper operation of a Jeep than most people give it credit for.

Jerry Bransford 06-09-2012 06:13 PM

Quote:

Originally Posted by Fitzey5435 (Post 2455551)
I am also starting to believe that the Crankshaft Position Sensor serves a much greater role in the proper operation of a Jeep than most people give it credit for.

The crankshaft position sensor provides the engine's master timing signal. Without it, the engine won't run. I'd say it has a pretty important role. :p


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