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Unread 02-09-2008, 01:05 PM   #1
eek142
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1999 WJ 
 
Join Date: Feb 2008
Location: NYC
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1999 Grand cherokee 4.0 has trouble staying on after cold start

Hi all,

New to forum and glad to be here!

I have a 1999 Grand Cherokee Laredo 2WD with the 4.0 I6 motor. It has about 130K miles. It has been having some trouble lately.

After putting in some regular gas (for the first time ever almost..usually put in 89 instead), the car has trouble staying on. It cranks when I turn the key, but will only turn over if I pump the accelerator hard.

Then I have to hold it at about 1500 RPM and let the RPMs down slowly so that it stays on. Otherwise, it will turn off. But once I get it to stay on, it keeps on running and can be driven. What could the problem be?

Oh yeah, the voltmeter gauge is reading 14V. Is that correct?

I used my OBDII code reader and I got a bunch of weird codes...1494, 0181, 0765, 0040. I don't know what they mean.

Thanks for reading and any help is appreciated!

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Unread 02-10-2008, 06:58 AM   #2
greasefingers
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Join Date: Sep 2003
Location: Northern VA, USA, NJ
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The type of fuel used has nothing to do with the issue. Regular fuel is easier to burn anyway. The 4.0L engine was designed to burn 87 octane fuel and I have never used anything else.

The 14 volt reading on the dashboard gage is perfect.

I am not sure exactly what the issue is, but I am guessing that it is either fuel delivery or the IAC (idle air control valve). If the IAC was partially clogged and stuck in the closed position, then you could experience this issue? By stepping on the gas pedal the IAC not important as air now enters past the throttle plate. Maybe gunning it wakes up the IAC valve? I would at least clean it first. Go to page two under the FAQ section and search for post # 22.
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Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 02-10-2008, 07:13 AM   #3
ratmonkey
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1997 ZJ 
 
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P1494 (M) : Leak Detection Pump Sw or Mechanical Fault : Incorrect input state detected for the Leak Detection Pump (LDP) pressure switch.
P0181: Fuel Temperature Sensor A Circuit Range/Performance
P0765 : Shift Solenoid D
P0040 isn't listed

hope that helps some
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Unread 02-10-2008, 07:42 AM   #4
greasefingers
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For some reason I have a hard time believing those codes.

Disconnect the battery for several minutes the clear the codes first. Then try pulling the codes the old fashion way.

Newer (OBDII) models - Put the key into the ignition, push down the odometer reset button, then turn the key to RUN (do not start the engine) with your finger on the button - and then release the button. The odometer will go through 1111111 through 999999, then display the car's serial number. It will then show the error codes (it might show them starting with P). If this method does not work, try the OBDI method.
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Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 02-10-2008, 08:28 AM   #5
eek142
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Join Date: Feb 2008
Location: NYC
Posts: 35
I will give all your advice a try guys and report back! Thanks!
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