2000 GT acting up weird, Please read and help - Ford Mustang Forum
 
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post #1 of 9 (permalink) Old 08-28-2018 Thread Starter
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2000 GT acting up weird, Please read and help

Hello, I need some help! My 2000 GT is acting weird and as usual mechanic cannot find anything because there is no CEL or codes. I started to notice the following symptoms:
After cleaning the MAF, IAC, EGR and Throttle body plate I had to disconnect the BATTERY a few times to clean each mentioned valve or sensor; so every time I did that the car runs great for a few miles then goes back to be a bit sluggish with a little vibration. Does any one have experience this and why this is happening? why it runs smooth and powerful after disconnecting the battery? why runs like crap after a few miles? is this a sensor going bad or what? Sometimes it runs good and sometimes it goes back to the described symptom.


THANKS !

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post #2 of 9 (permalink) Old 08-28-2018
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Did you clean all those things because it was running bad?
How about the basics? How old are the spark plugs and wires? What’s vibrating, the hood when idling? How sluggish are we talking? Does it bog down and not want to go when you accelerate? Like it’s missifing

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post #3 of 9 (permalink) Old 08-28-2018
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How many miles? IF over 150k Miles some consideration should be given to worn timing chains.

How to test? One method is to cut open the oil filter and look for any debris. Another symptom is chain rattle during start up.

Note, worn timing chain guides is a common problem in high mileage motors. If guide wear is allowed to continue too long it is possible for this to cause motor failure (happened to the original motor in my 2000 GT at 145k).

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2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #4 of 9 (permalink) Old 08-28-2018 Thread Starter
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I've replaced the coils and spark plugs 2 weeks ago (Motorcraft with the right gap-Platinum), It has a rebuild tranny and a brand new TPS sensor (Motorcraft). Also the ECU was reflashed a month ago by the Ford. The car runs great sometimes and then runs like ****.
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post #5 of 9 (permalink) Old 08-28-2018 Thread Starter
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Quote:
Originally Posted by wmburns View Post
How many miles? IF over 150k Miles some consideration should be given to worn timing chains.

How to test? One method is to cut open the oil filter and look for any debris. Another symptom is chain rattle during start up.

Note, worn timing chain guides is a common problem in high mileage motors. If guide wear is allowed to continue too long it is possible for this to cause motor failure (happened to the original motor in my 2000 GT at 145k).
Car has 60k miles
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post #6 of 9 (permalink) Old 08-28-2018
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Suggest starting out by ruling out excessive EGR flow. Disconnect and plug the EGR vacuum line. Does this make any difference?

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #7 of 9 (permalink) Old 08-28-2018 Thread Starter
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I haven't done that but I will tomorrow ! thanks!
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post #8 of 9 (permalink) Old 08-31-2018
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Quote:
Originally Posted by wmburns View Post
Suggest starting out by ruling out excessive EGR flow. Disconnect and plug the EGR vacuum line. Does this make any difference?
After reading the OP post, the EGR was the fist thing that came to mind also. Burns is on it.
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post #9 of 9 (permalink) Old 09-04-2018 Thread Starter
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UPDATE:

Last week The car was scanned twice by two mechanic shops, one didn't charge me and he said to me that there were two things that didn't make sense (MAF reading was to low and TPS sensor running @97% open when closed) . The second "mechanic" explained that his 30K scanner will help him to make everything transparent to find the issue so we met and after a few tests and diagnosis he said that there was a vacuum leak in the cold air intake, so according to him he adjusted the rubber hoses and clamps. That day the car was running good because of the weather wasn't hot, I think hot temperature is affecting the car or one of the sensors. Last Friday the temperature was 70 degrees and car was running like new and specially at night, so much power; the next day the temperature was 82 and the car was vibrating a bit and had a loss of power and still running like that until today (82 degrees) What can affect this hot weather?????
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