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98' XJ idling issues

Old 09-03-2015, 04:08 PM
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Default 98' XJ idling issues

Hey guys I'm new here and glad to be a part of this forum! Here to seek some expert advice...

Anyway, I bought my 98' XJ about a month ago with 175,000 miles. It's been running like a charm except for the first few minutes every time I start it.

Once started it idles around 800rpm for a minute, then the idle goes crazy dipping up and down and almost stalling for a few minutes. During this time it smells like gasoline and sounds like an old boat. Once its done going through this it will be fine for driving until its shut off and started again. If I try to drive it while its being funky I can barely accelerate and cant go over 2000rpm for a few minutes, then it drives normally again.

After some advice, I have cleaned the throttle body and IAC valve. Nothing has changed, anyone here ever experience a similar problem? Where should I look next? Thanks guys, much appreciated.
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Old 08-03-2018, 01:25 AM
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My 94 Cherokee w/ 4.0, I've had it for 24 years. A few weeks back I cleaned the throttle body with spray cleaner and, it was filthy, ever since it idles very high, around 1800-2000+ rams. Anyone have any suggestions, I will welcome them. Thanx
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Old 08-03-2018, 09:26 AM
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DeBo, you should start your own thread rather than revive a 3 year old one.

In regard to your problem, I'd bet you jostled a vacuum line loose when you were in there or cracked an old dried out line. If there's nothing going on with the vacuum lines, I'd check your intake/exhaust bolts are tight, you might have pushed it loose while in there.
The other thing is you may have damaged your IAC valve (the little phallic shaped sensor in the TB) or the TPS.

Last edited by PatHenry; 08-03-2018 at 09:30 AM.
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Old 08-05-2018, 11:12 AM
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I think Dave said he cleaned his TB with spray cleaner and messed up the TPS, ..had to replace it as I recall.
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Old 11-17-2018, 12:17 PM
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Default Weird stalling, loping, idling issues with gas smell until warmup explained

just for future reference to anyone who reads his post. More than likely you are having idling issues because the O2 sensor (heaters) are not working. Normally the O2 sensor will heat itself up to 600-900 degrees so that it can get a more accurate oxygen reading for the engine. If the heater is out on the O2 sensor the vehicle would run like crap until it got up to operating temperature and then your symptoms would slowly dissolve away. Normally the sensor is switching back and forth from .1 volts up to .9 volts. about twice a second. .1 volts = lean mixture & .9 volts = rich. so if the O2 sensor is cold and trying to get a clear reading it will be going from lean to rich. and the idle will be jumping all over the place, smelling like fuel then smelling like a blackcat, loping.

Google Symptoms of a bad O2 Sensor. Here is your result:
Symptoms of a Bad Oxygen Sensor. When you have abad oxygen sensor, your vehicle will run less efficiently, it can sometimes have a poor idle, erratic jerking atsteady throttle, hard starting problems, cause thecheck engine light to come on, and will cause high fuel consumption.

In short. Change your 02 Sensors. Don't be cheap and clean them. they have reached temperatures of thousands of degrees, thousands of times. They play a major factor in the life of the engine, exhaust, and gas mileage. If you are driving around with bad O2 sensors the engine is not harmonic (all cylinders burning the same temp and equally powered) if you drive around with misfires you will destroy your catalytic converter. Not to mention the uneven power strokes on the engine is horrible for it.

if you can't set a glass full of water on top of a factory economy cam engine without it spilling a drop it could use a little love.

This is my first Chrysler vehicle;
1995 Grand Cherokee Limited 5.2L My first Chrysler, bought running @ an online auction $638. Oil pressure issues, changed oil pump, sending unit, oil and filter Also has Deathwobble, replace all 4 shock absorbers (had 4 different shocks all the way around?? LOL)

1990 Chevy silverado 5.7L retired at 700,000 miles
1991 Honda civic hatchback 1.5L retired at 500,000 miles
2005 Honda civic LX 1.7L sold at 320,000 miles with factory compression

Pennzoil Oil with WIX filters 4 life!!!

Last edited by Hurricane Harvey; 11-17-2018 at 12:21 PM.
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Old 11-17-2018, 08:30 PM
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Originally Posted by Hurricane Harvey View Post
just for future reference to anyone who reads his post. More than likely you are having idling issues because the O2 sensor (heaters) are not working. Normally the O2 sensor will heat itself up to 600-900 degrees so that it can get a more accurate oxygen reading for the engine. If the heater is out on the O2 sensor the vehicle would run like crap until it got up to operating temperature and then your symptoms would slowly dissolve away. Normally the sensor is switching back and forth from .1 volts up to .9 volts. about twice a second. .1 volts = lean mixture & .9 volts = rich. so if the O2 sensor is cold and trying to get a clear reading it will be going from lean to rich. and the idle will be jumping all over the place, smelling like fuel then smelling like a blackcat, loping.

Google Symptoms of a bad O2 Sensor. Here is your result:
Symptoms of a Bad Oxygen Sensor. When you have abad oxygen sensor, your vehicle will run less efficiently, it can sometimes have a poor idle, erratic jerking atsteady throttle, hard starting problems, cause thecheck engine light to come on, and will cause high fuel consumption.

In short. Change your 02 Sensors. Don't be cheap and clean them. they have reached temperatures of thousands of degrees, thousands of times. They play a major factor in the life of the engine, exhaust, and gas mileage. If you are driving around with bad O2 sensors the engine is not harmonic (all cylinders burning the same temp and equally powered) if you drive around with misfires you will destroy your catalytic converter. Not to mention the uneven power strokes on the engine is horrible for it.

if you can't set a glass full of water on top of a factory economy cam engine without it spilling a drop it could use a little love.

This is my first Chrysler vehicle;
1995 Grand Cherokee Limited 5.2L My first Chrysler, bought running @ an online auction $638. Oil pressure issues, changed oil pump, sending unit, oil and filter Also has Deathwobble, replace all 4 shock absorbers (had 4 different shocks all the way around?? LOL)

1990 Chevy silverado 5.7L retired at 700,000 miles
1991 Honda civic hatchback 1.5L retired at 500,000 miles
2005 Honda civic LX 1.7L sold at 320,000 miles with factory compression

Pennzoil Oil with WIX filters 4 life!!!
Golly, any first time poster that swears by Pennzoil, cures death wobble with 4 shock absorbers, and fixes low oil pressure by changing an oil pump, well sir, I'm gonna take that advice.

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Old 11-17-2018, 09:16 PM
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Originally Posted by 97grand4.0 View Post
Golly, any first time poster that swears by Pennzoil, cures death wobble with 4 shock absorbers, and fixes low oil pressure by changing an oil pump, well sir, I'm gonna take that advice.
lol. Simple answers for simple problems. Mitchell 1 on demand 5 is a must. I have heard a lot about oil pump problems on these Chrysler engines. So if this is my first Chrysler k let's just eliminate that off the rip
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Old 11-17-2018, 09:18 PM
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Originally Posted by Hurricane Harvey View Post
lol. Simple answers for simple problems. Mitchell 1 on demand 5 is a must. I have heard a lot about oil pump problems on these Chrysler engines. So if this is my first Chrysler k let's just eliminate that off the rip
Lol. do any plastiguage when you had that pan down? just wondering.
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Old 11-25-2018, 01:54 AM
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No I did not. had i thought about it before hand i would have ordered some.
Have my mind on all the other problems for the time being.
One thing about getting a used vehicle. "You're just buying someone elses problem"
lol
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