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Author Topic: stalling  (Read 1832 times)

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fireman411

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stalling
« on: July 13, 2011, 09:08:48 PM »
its been a while but I need some help. My 90 yj after running for a little bit will drop idle and stall out. I have changed the plugs,wires,cap,rotor, fuel filter. It will only do it if it has th hose on it going from the air box to the TB. I can not figure it out to save my life.
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Offline sharpxmen

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Re: stalling
« Reply #1 on: July 14, 2011, 09:42:37 AM »
not sure which hose you are referring but have a look at the air filter (just because you mentioned the airbox)
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'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
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Offline grumpygy

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Re: stalling
« Reply #2 on: July 14, 2011, 10:45:13 AM »
Think the MAP Sensor is getting a false reading because the hose is off.
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94 YJ, Cool Air intake, 19lb Inj, 4.0 Throttlebody with spacer,  31/10.50/15's

Offline chardrc

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Re: stalling
« Reply #3 on: July 14, 2011, 06:02:18 PM »
you must be talking about the vacuum line for the hot air vacuum operated door in the air box. it applies vacuum to open the door and if the tube from the air box to the exhaust manifold is still there would start partial shutting ounce the exhaust manifold heats up and gets the air hot... don't really see how that vacuum door system could kill the jeep. would only see it leaking and causing a high idle.
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1990 YJ 4cly, ax5, 2.5 inch BDS lift, 31 MTr\'s,  Powertrax-lockers all around, track-bars removed, boomerang shackles, warn m8000 winch, electric fan. [sold but not forgotten]

2007 jk Rubicon 2dr

Offline sharpxmen

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Re: stalling
« Reply #4 on: July 14, 2011, 06:09:58 PM »
Quote from: grumpygy on July 14, 2011, 10:45:13 AM
Think the MAP Sensor is getting a false reading because the hose is off.

only if the line going to the MAP sensor is off, damaged or plugged will cause false readings, having another line off or a leak does not cause false reading, it just reads the correct (less) vacuum and the idle would be higher due to more air entering the engine. If it was a MAF sensor then you'd be correct (the additional air entering the engine would bypass the MAF sensor), with MAP the vac leak theory does not apply.
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'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Offline neale_rs

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Re: stalling
« Reply #5 on: July 15, 2011, 10:29:34 AM »
Quote from: fireman411 on July 13, 2011, 09:08:48 PM
It will only do it if it has th hose on it going from the air box to the TB.

So it runs ok with the hose disconnected?  This sounds like the hose gets blocked off when attached. 
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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 chardrc

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Re: stalling
« Reply #6 on: July 15, 2011, 12:12:35 PM »
so if it runs with it off and not on i would think the idle control actuator motor is closing the throttle too much and needs the extra air from the open vacuum line to run.. seems odd... if it is as described i would take a volt meter and test the tps adjustment.
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1990 YJ 4cly, ax5, 2.5 inch BDS lift, 31 MTr\'s,  Powertrax-lockers all around, track-bars removed, boomerang shackles, warn m8000 winch, electric fan. [sold but not forgotten]

2007 jk Rubicon 2dr

fireman411

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Re: stalling
« Reply #7 on: August 14, 2011, 06:02:46 PM »
OK well I have changed the coolant temp sensor and map sensor. Still doing the same thing also replaced the hose coming off the map sensor. I am lost.  :brick:
Does anyone think it might be a timing issue? Im shooting in the dark now
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Offline chardrc

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Re: stalling
« Reply #8 on: August 14, 2011, 06:57:36 PM »
could it possibly be the egr being opened at idle (which shouldn't happen but would kill the engine, easy enough to check also without spending any money).double check you lines and try capping off the egr and see if it still cuts out.
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1990 YJ 4cly, ax5, 2.5 inch BDS lift, 31 MTr\'s,  Powertrax-lockers all around, track-bars removed, boomerang shackles, warn m8000 winch, electric fan. [sold but not forgotten]

2007 jk Rubicon 2dr

Offline aka-justin

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Re: stalling
« Reply #9 on: August 20, 2011, 08:27:18 PM »
Quote from: fireman411 on August 14, 2011, 06:02:46 PM
OK well I have changed the coolant temp sensor and map sensor. Still doing the same thing also replaced the hose coming off the map sensor. I am lost.  :brick:
Does anyone think it might be a timing issue? Im shooting in the dark now


Do you have a scan tool? What DTC codes are you getting: Stored before you start it and once it dies?

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[1995 YJ 2.5L with 4" lift on 31" KM2 - Sold] 1995yj
[2003 TJ Rubicon 4.0L with 4" lift on 35" Wrangler M/T - Sold]
To be continued...
--Justin

Offline chardrc

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Re: stalling
« Reply #10 on: August 21, 2011, 06:25:33 PM »
Quote from: 1995yj on August 20, 2011, 08:27:18 PM
Do you have a scan tool? What DTC codes are you getting: Stored before you start it and once it dies?


this is 1990 tbi, doesn't store codes and scan tools are few and far between.
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1990 YJ 4cly, ax5, 2.5 inch BDS lift, 31 MTr\'s,  Powertrax-lockers all around, track-bars removed, boomerang shackles, warn m8000 winch, electric fan. [sold but not forgotten]

2007 jk Rubicon 2dr
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