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Old 02-14-2011, 17:12   #1 (permalink)
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Arrow Hesitation - Sometimes - 2000 CV

I have a 2000 Crown Vic with 124,000 miles. Cranks up good even when it is 10 degrees outside. I have just noticed some lower idling after the engine has become hot. Here are some of the things that happen after it is hot but not all the time.

When you crank it again after it is hot and the car has sit for 10-20 minutes it will crank but will idle at a lower rpm. It will not go dead but you can tell the idle speed is lower than before when you cut it off.

I have not changed the spark plugs or had a fuel system cleaning done since I have had the car. I have no missing on the engine nor problems acclerating. I run highway miles to and from work about 25 miles each way. It has done this lower idling several times now. I noticed today during this lower idling all at once it idled back up to normal to where it almost created a jerk while I was at the redlight. Please share your comments and solutions THANKS
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Old 02-14-2011, 17:50   #2 (permalink)
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Re: Hesitation - Sometimes - 2000 CV

The spark plugs or injectors won't cause that. Autozone or O'Reilys will check codes for free. The light doesn't have to be on to have codes. While there, get a can of MAF cleaner and clean the MAF.
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Old 02-15-2011, 05:59   #3 (permalink)
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Re: Hesitation - Sometimes - 2000 CV

Bert - where is the Mass Air Flow sensor located on the CV? What is the best way to clean it once I have the CRC MAF Cleaner? Thanks for the information.
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Old 02-15-2011, 08:03   #4 (permalink)
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Re: Hesitation - Sometimes - 2000 CV

It's located in your air cleaner housing. Open the cover and spray in the MAF, then let it dry for 15 min.
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Old 02-15-2011, 16:58   #5 (permalink)
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Re: Hesitation - Sometimes - 2000 CV

Any other thoughts if this will not fix the problem?
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Old 02-15-2011, 17:24   #6 (permalink)
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Re: Hesitation - Sometimes - 2000 CV

Have you had it checked for codes?
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Old 04-08-2011, 19:01   #7 (permalink)
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Re: Hesitation - Sometimes - 2000 CV

Bert,

I have got the codes for the 2000 Crown Vic. They are as follows: P1507, P0153, P0430. Do you think it is still the MAS? I was just curious what about the Idle Air Control do you think it needs cleaning? Thanks for your help.
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Old 04-08-2011, 20:54   #8 (permalink)
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Re: Hesitation - Sometimes - 2000 CV

P0153 OBD-II Trouble Code: P0153 Oxygen Sensor Circuit Slow Response (Bank2, Sensor1)
P0430 OBD-II Trouble Code: P0430 Catalyst Efficiency Below Threshold (Bank 2)
P1507 Idle Air Control Under Speed Error This is the IAC problem that cleaning it may help. The other 2 are for a lean condition on bank 2, (drivers side). Maybe an exhaust leak etc. Have you cleaned the MAF and IAC yet? IAC is cleaned with carb cleaner.
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Old 04-08-2011, 21:09   #9 (permalink)
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Re: Hesitation - Sometimes - 2000 CV

When you clean the IAC, hold it so none of the liquid runs toward the solenoid. Read this caption:

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Old 05-21-2012, 09:51   #10 (permalink)
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Re: Hesitation - Sometimes - 2000 CV

Steve83 - I have the following codes on my 2001 Crown Victoria. They are as follows: P1507, P0153, P0430. Here is what I have done with my initial focus on the MAS. Changed air filter. Cleaned the MAS with the right type of spray. Cranked it then unplugged the Mass Air Flow Sensor (MAS) to see if it would get better and it actually got a little worse - therefore I consider it is still working right??? Not 100% sure. The only time it does the low idle and trying to stall out is after it has run and got up to full operating temperature then cut it off wait 5-10 minutes and try to restart. Then the problem occurs and typically this is in hot weather most of the time. Do we think it is the IAC?? If so Clean it out with Carb cleaner and allow to dry for about 10-15 minutes. THANKS
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