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Author Topic: Problem with the Jeep  (Read 3161 times)

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Offline grumpygy

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Problem with the Jeep
« on: June 24, 2015, 06:17:39 AM »
  Looking for Ideas on where to look.  Alt went out so bad it blew the two 50A fuses for the Alt.  Bit it still ran on the Battery got me home.  I changed out the Alt, It fired up and seemed to run good.  The next day I get in it fire it up still seems to be running good, release the parking brake engine dies.  Will not refire and get a strong smell of gas like its flooded.

  That night is when I found the fuses bad.  I replaced the fuses and for safety the relay for the fuel pump.  Now all I get is it will fire once after I have not tried to start it in a while  but will not run longer than a few seconds.

So any Ideas.
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94 YJ, Cool Air intake, 19lb Inj, 4.0 Throttlebody with spacer,  31/10.50/15's

Offline grumpygy

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Re: Problem with the Jeep
« Reply #1 on: June 24, 2015, 09:40:35 AM »
Ok did nothing new but tried to start it in the Morning.  Started and  ran great for a couple of minutes.  Then I Idle it started to lope then shut down.  Was able to refire it and long as i kept it revved up it ran, but try to let it idle and it shut down.

  Another note the first night I had it running it backfire thru the intake with the engine revved but kept running.  Wonder if I may have done some damage as it was a bad backfire.

  Now notice  a whistle but I do have a cold air intake.  but thought when I put this new one on it had stopped.
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94 YJ, Cool Air intake, 19lb Inj, 4.0 Throttlebody with spacer,  31/10.50/15's

Offline neale_rs

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Re: Problem with the Jeep
« Reply #2 on: June 24, 2015, 11:14:54 AM »
Maybe the idle air controller is not working correctly.
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'95 YJ, 33 x 12.5 mud tires, RE 4.5 ED lift, Atlas 4 speed, rear D44, ARBs front and rear, 4.56 gears, 8000# winch

Offline Jeffy

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Re: Problem with the Jeep
« Reply #3 on: June 24, 2015, 02:04:34 PM »
First thing I'd do is check for codes.  If it's running that rough there should be some codes stored.  What voltage is the alternator putting out at idle?  What's the voltage at the battery with the engine off?

Backfiring is usually a timing issue. Though a bad battery can also cause a lot of weird problems.

I don't know about it being the IAC.  When that's not connected the engine won't want to start unless you're on the throttle.  Once it warms up it should then idle.
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Offline neale_rs

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Re: Problem with the Jeep
« Reply #4 on: June 24, 2015, 04:23:09 PM »
Like they say:  Check the last thing that was fixed.  It actually turns out that way pretty often.
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Offline grumpygy

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Re: Problem with the Jeep
« Reply #5 on: June 24, 2015, 04:39:43 PM »
Quote from: neale_rs on June 24, 2015, 04:23:09 PM
Like they say:  Check the last thing that was fixed.  It actually turns out that way pretty often.

Did that last night,

Voltage this morning was showing close to 14v at idle.  I just put in a 170A alt.  New battery.  Thinking I bumped something.  The backfire was just on time.  When its warm(not the jeep just warm day jeep was cold) like in the Afternoon I get just a brief run 15- 20 sec and it shuts down and will not refire.

  I'll try to look it over tonight again, but with work may not get to it till Friday.
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Offline grumpygy

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Re: Problem with the Jeep
« Reply #6 on: June 24, 2015, 07:43:43 PM »
Ran about 30 second and shut down like the key was turned off.
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94 YJ, Cool Air intake, 19lb Inj, 4.0 Throttlebody with spacer,  31/10.50/15's

Offline Jeffy

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Re: Problem with the Jeep
« Reply #7 on: June 24, 2015, 08:05:02 PM »
I'm wondering if you hosed the fuel pump and that's triggering the auto shut-off or else it's just running out of gas.
« Last Edit: June 24, 2015, 08:05:41 PM by Jeffy »
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"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline grumpygy

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Re: Problem with the Jeep
« Reply #8 on: June 24, 2015, 08:40:53 PM »
Quote from: Jeffy on June 24, 2015, 08:05:02 PM
I'm wondering if you hosed the fuel pump and that's triggering the auto shut-off or else it's just running out of gas.

Have not heard the pump running.  For sure tank is full.
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94 YJ, Cool Air intake, 19lb Inj, 4.0 Throttlebody with spacer,  31/10.50/15's

Offline Jeffy

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Re: Problem with the Jeep
« Reply #9 on: June 25, 2015, 12:10:34 AM »
Quote from: grumpygy on June 24, 2015, 08:40:53 PM
Have not heard the pump running.  For sure tank is full.
When I mean out of gas I mean the pump isn't pumping.
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"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline grumpygy

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Re: Problem with the Jeep
« Reply #10 on: June 26, 2015, 08:20:41 AM »
Will try today to replace fuel filter.  Jeep had not been fuel in a long while and just the day before this started I filled it up.  Filter on there is also really old.

So at the filter what should my Fuel pressure be.  Be easy to hook up right after I pull the old filter.


  Also if I turn on the key but do not start it should I not be able to hear the pump running.
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94 YJ, Cool Air intake, 19lb Inj, 4.0 Throttlebody with spacer,  31/10.50/15's

Offline neale_rs

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Re: Problem with the Jeep
« Reply #11 on: June 26, 2015, 11:37:57 AM »
When you turn the key but not so far as to crank, you should be able to hear the pump run for a short while. If it is not doing this, it could be what Jeffy said about the ASR relay shutting everything down (and the cause of this would still be unknown).

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'95 YJ, 33 x 12.5 mud tires, RE 4.5 ED lift, Atlas 4 speed, rear D44, ARBs front and rear, 4.56 gears, 8000# winch

Offline Jeffy

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Re: Problem with the Jeep
« Reply #12 on: June 26, 2015, 01:50:35 PM »
Quote from: grumpygy on June 26, 2015, 08:20:41 AM
Will try today to replace fuel filter.  Jeep had not been fuel in a long while and just the day before this started I filled it up.  Filter on there is also really old.

So at the filter what should my Fuel pressure be.  Be easy to hook up right after I pull the old filter.


  Also if I turn on the key but do not start it should I not be able to hear the pump running.
If you have a bunch of sediment in the tank it's going to get caught up on the pickup sock filter.  Pressure should be around 100 PSI, IIRC.  I'm wondering if there might be something wrong with the fuel pump since you did blow the fuse.
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"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline grumpygy

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Re: Problem with the Jeep
« Reply #13 on: June 26, 2015, 05:23:04 PM »
I did not blow the Fuel pump fuse just the two 50A alt fuses.  I did replace the fuel pump relay  but that was a just in case move and it was cheap.


I do not hear the fuel pump run when I turn the key.
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94 YJ, Cool Air intake, 19lb Inj, 4.0 Throttlebody with spacer,  31/10.50/15's

Offline grumpygy

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Re: Problem with the Jeep
« Reply #14 on: June 28, 2015, 09:55:50 AM »
Well checked for codes there are none.  Really think its the auto shut down, but how to know for sure.
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94 YJ, Cool Air intake, 19lb Inj, 4.0 Throttlebody with spacer,  31/10.50/15's
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