2003 Mercury Grand Marquis troubleshooting help

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Anonymous
2003 Mercury Grand Marquis troubleshooting help 2016-05-30 02:06:53 Post No. 15164503
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2003 Mercury Grand Marquis troubleshooting help Anonymous 2016-05-30 02:06:53 Post No. 15164503 [Report]

So my fiance's grandfather gifted me his 2003 grand marquis A few weeks ago when his eyes went too bad to drive himself, and he's taken wonderful care of it. He bought it brand new, did regular scheduled maintenence, and it hashould roughly 160,000 miles. Now, when I started driving it, it operated almost perfectly, with only one real problem. Every so often, if I very lightly accelerated it would lurch forward and then continue to accelerate smoothly, and sometimes it would just not accelerate at all for a few seconds, or I'd lose acceleration. I called some fuck I used to work with at a recovery shop and he said to spray carb cleaner into the air intake while it was running. I did this the day before yesterday, and since then it stopped losing acceleration but I lost almost all idle and most of the pickup. When I sprayed the Berrymans B12 carb choke and throttle cleaner in I know I got some on the MAF sensor, so today I got CRC MAF cleaner and cleaned it with that. I also got CRC throttle and intake cleaner and cleaned the throttle panel and as far as I could reach around it, and removed and cleaned the idle air control valve. Now the idle is back to normal, but I still don't get the same pickup I was getting before I "fixed" it the first time, and the engine hesitates and rumbles on acceleration, usually between 30-50 mph. Any suggestions or advice from someone who knows more than I do?

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Joe 2016-05-30 02:11:58 Post No.15164526
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Joe 2016-05-30 02:11:58 Post No.15164526 [Report]

It sounds like a sensor.. probably a throttle position sensor. You can take it to autozone or oreillys and they will scan it and tell you if the computer detected a problem

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Anonymous 2016-05-30 02:12:05 Post No.15164528
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Anonymous 2016-05-30 02:12:05 Post No.15164528 [Report]

I'm hoping g it's something I can do myself. I know most of the parts for this car are relatively cheap, so if I can avoid taking it to a shop I'd like to try.

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Anonymous 2016-05-30 02:13:22 Post No.15164535
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Anonymous 2016-05-30 02:13:22 Post No.15164535 [Report]

>>15164526
I've been wondering if that's the case, if it is ill just have someone do that for me. Looked up the procedure and it's a bit beyond my ability.

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Anonymous 2016-05-30 02:16:57 Post No.15164550
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Anonymous 2016-05-30 02:16:57 Post No.15164550 [Report]

>>15164535
Unless I was reading about adjusting it instead of just replacing it. I can definitely just replace it.

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Anonymous 2016-05-30 02:18:54 Post No.15164556
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Anonymous 2016-05-30 02:18:54 Post No.15164556 [Report]

>>15164526
Will driving on it like this until I can get it fixed do bad damage?

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Anonymous 2016-05-30 02:21:38 Post No.15164571
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Anonymous 2016-05-30 02:21:38 Post No.15164571 [Report]

>>15164503
Vast majority of the time these sorts of concerns are coils/plugs. Mostly the coils.

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Anonymous 2016-05-30 02:24:00 Post No.15164588
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Anonymous 2016-05-30 02:24:00 Post No.15164588 [Report]

>>15164571
See now this is an area I dont have knowledge of. Any way you'd be willing to give me a brief explanation of that system, and what may be wrong with it? I am trying to learn how to maintain my own vehicle, so any help would be greatly appreciated.

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Anonymous 2016-05-30 02:25:03 Post No.15164597
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Anonymous 2016-05-30 02:25:03 Post No.15164597 [Report]

>>15164571
Should have mentioned plugs I know, not the coils.

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Anonymous 2016-05-30 05:09:48 Post No.15165409
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Anonymous 2016-05-30 05:09:48 Post No.15165409 [Report]

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>>15164588
That car has eight coils individually controlled by the PCM that generate high voltage but low amperage (see: Kettering ignition) and are used to fire the plugs. Most common failure is the boot due to age (pic related) but the body of the coil can also allow arcing to ground so it's best to just replace both. Especially since you can't really get boots separate from the coil itself through regular parts channels.

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Anonymous 2016-05-30 05:25:56 Post No.15165504
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Anonymous 2016-05-30 05:25:56 Post No.15165504 [Report]

>>15164503
Another thing to look at replacing is the fuel filter, since it's an often forgotten thing.