Engine stalls when i stop, or rapid deceleration
10-08-2011 | 12:06 PM
#1
Thread Starter
CF Veteran
Joined: Oct 2011
Posts: 1,467
Likes: 1
From: Warrenton MO
Year: 2000
Model: Cherokee
Engine: 4.7L I6
Engine stalls when i stop, or rapid deceleration
I replaced my coil packs and my fuel pump. it pretty much just starts mis-firing on all cylinders and dies when i stop, then starts right back up.
It only happens after i drive about 10 miles.
No vaccume leaks either.
WTF is wrong with ol dixie?!?!
I have a new 4.7 stroker engine at the speed shop now, but i dont want to put it in until i figure out whats goin on.
It only happens after i drive about 10 miles.
No vaccume leaks either.
WTF is wrong with ol dixie?!?!
I have a new 4.7 stroker engine at the speed shop now, but i dont want to put it in until i figure out whats goin on.
10-08-2011 | 12:17 PM
#3
Senior Member
Joined: Mar 2010
Posts: 855
Likes: 1
From: Southern California
Year: 1989 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
I would also look into the Crankshaft Position Sensor... mine was doing the same thing, popped a new CKP in and problem went away.
10-08-2011 | 12:19 PM
#5
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 30
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
idle air control on side of throttle body,it a thing to check if it dirty clean it and the hole it mounts in, just search it
Last edited by freegdr; 10-08-2011 at 12:21 PM.
10-08-2011 | 12:20 PM
#6
CF Veteran
Joined: Jun 2010
Posts: 2,093
Likes: 1
From: Placerville, CA
Year: 1989
Model: Cherokee
Engine: 4.0 Inline 6
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10-08-2011 | 01:42 PM
#10
Thread Starter
CF Veteran
Joined: Oct 2011
Posts: 1,467
Likes: 1
From: Warrenton MO
Year: 2000
Model: Cherokee
Engine: 4.7L I6
crank position sensor changed. iac changed and cleaned housing. Runs like a ticking knocking noisy oil burning engine again!! but one that hopefully wont stall!!
10-08-2011 | 05:42 PM
#13
Caracticus Potts The Mod
Joined: Jul 2009
Posts: 5,298
Likes: 9
From: Hainsville, NJ
Model: Grand Cherokee
Check the battery state.
With the engine cold, connect a volt meter across the battery. Remove the fuel pump relay. Crank the engine for 15 seconds monitoring the voltage. It should stay above 9 volts.
Also Check that the Idle Speed motor is not sticking, remove it but keep it plugged in, cycle the key from on to off a few times and see if it moves freely....don't try to start with it out.
Sounds like a battery problem though, when the battery ends up with an internal short across the cells it will screw with the electronics on the vehicle by suddenly dropping out voltage when the alternator state of charge drops below 1200 rpm.
With the engine cold, connect a volt meter across the battery. Remove the fuel pump relay. Crank the engine for 15 seconds monitoring the voltage. It should stay above 9 volts.
Also Check that the Idle Speed motor is not sticking, remove it but keep it plugged in, cycle the key from on to off a few times and see if it moves freely....don't try to start with it out.
Sounds like a battery problem though, when the battery ends up with an internal short across the cells it will screw with the electronics on the vehicle by suddenly dropping out voltage when the alternator state of charge drops below 1200 rpm.
10-08-2011 | 05:52 PM
#15
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 19
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Over my head here...But. Stalling at high vacuum? Isn't there something with a fuel pressure regulator and vacuum? Doesn't it lower the fuel pressure idling and decelerating? Hope I'm not making things worse!