Possible fuel pump or TPS issues? - Ford Mustang Forum
 
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post #1 of 11 (permalink) Old 01-19-2010 Thread Starter
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Possible fuel pump or TPS issues?

I went to start my car at work last week to drive home and something happen that has never happened before or since. When the car started it ran a little rough and the idle oscillated between 900 and 1200 rpm @ cold start up. I drove the car away and it sounded a little off but had good but not great throttle response. I got to the end of the block and pulled over (because I didn't want this thing to quite in the middle of traffic. I didn't want to be that guy) open the hood and everything looked good but still sounded a little off. If you have ever tuned carb idle mixture by ear, it sounded like a carb with way rich idle mixture. Anyway as I was looking to make sure everything was hooked up and no connections were lose, I heard a "click" noise and it started running perfectly.

I just wondering what this could be before it completely breaks down and leaves me stranded. (no codes tripped).


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post #2 of 11 (permalink) Old 01-19-2010
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i'm guessing you started it and took off right away?..... without letting it warm up first?


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post #3 of 11 (permalink) Old 01-19-2010
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how cold is it there in canada? i think the engine was just revving high to warm itself up a little extra is all. When you go from "P" or "N" to "D" the revs will drop a few hundred so naturally the engine won't produce as much heat.

It couldn't hurt however to clean the TB and the MAF sensor

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post #4 of 11 (permalink) Old 01-19-2010
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what are you talking about heat for? i think its a comon rule of thumb that a cold engine will be cold on start-up :hihi:, are your reffering to cold idle?

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post #5 of 11 (permalink) Old 01-19-2010 Thread Starter
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I let it warm up for about 2 minutes as it was about +10 degrees Celsius ( about 50 degrees F) which is not any differently than the way I have been doing it for the last five years. This is a manual transmission car and I'm familiar with the fact that it will high idle when cold for a couple of minutes before settling down to normal idle. What I'm wondering about is what would make the idle bounce from 900 to 1200 rpm uncontrollably (By the way, the A/C compressor was not causing this as it was turned off) and running roughly before clearing up on it's own.

I think your right Hotshot, my first plan of attack will be to clean the TB and MAF, as its been about 1 year since I did it last.

2005 black GT premium (5spd) / GT500 front LCA/upper strut mounts / Koni Adjustable (yellow)shocks with Roush Springs / FRPP 4:10 rear gear / BMR rear UCA/LCA+relocation brackets / MGW Shifter / Bassani axle backs / Cervinis heat extractor hood and Ducktail spoiler / Carroll Shelby CS69 20x9/20x10 wheels / MSD Blaster 2 coils / Roush TVS2300 Supercharger+Brenspeed 560R upgrade / Exedy Mach 500 Stage 3 Clutch / Exedy lightweight flywheel / SR Performance braided stainless clutch Line / Afco Dual Fan Heat Exchanger upgrade / JLT Catch Can / Axle Exchange one piece aluminum DS / Silly grin on my face every time I turn the key.
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post #6 of 11 (permalink) Old 01-19-2010
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Quote:
Originally Posted by cman View Post
I let it warm up for about 2 minutes as it was about +10 degrees Celsius ( about 50 degrees F) which is not any differently than the way I have been doing it for the last five years. This is a manual transmission car and I'm familiar with the fact that it will high idle when cold for a couple of minutes before settling down to normal idle. What I'm wondering about is what would make the idle bounce from 900 to 1200 rpm uncontrollably (By the way, the A/C compressor was not causing this as it was turned off) and running roughly before clearing up on it's own.

I think your right Hotshot, my first plan of attack will be to clean the TB and MAF, as its been about 1 year since I did it last.

at 50 you shouldn't have any issues with the cold air, i agree with cleaning the tb & maf, do you have a cai? what year and how many miles on her?

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post #7 of 11 (permalink) Old 01-20-2010 Thread Starter
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It's a 2005 GT (a little lass than 50.000 miles) with a C&L CAI and a brenspeed tune. I love the tune and its been in the car for about three years now, so I don't think the tune is the problem. Having said that, Perhaps it might be an to reload the tune to just refresh everything.

2005 black GT premium (5spd) / GT500 front LCA/upper strut mounts / Koni Adjustable (yellow)shocks with Roush Springs / FRPP 4:10 rear gear / BMR rear UCA/LCA+relocation brackets / MGW Shifter / Bassani axle backs / Cervinis heat extractor hood and Ducktail spoiler / Carroll Shelby CS69 20x9/20x10 wheels / MSD Blaster 2 coils / Roush TVS2300 Supercharger+Brenspeed 560R upgrade / Exedy Mach 500 Stage 3 Clutch / Exedy lightweight flywheel / SR Performance braided stainless clutch Line / Afco Dual Fan Heat Exchanger upgrade / JLT Catch Can / Axle Exchange one piece aluminum DS / Silly grin on my face every time I turn the key.
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post #8 of 11 (permalink) Old 01-20-2010
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Try cleaning with some MAF cleaner the maf and the tb.


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post #9 of 11 (permalink) Old 01-20-2010
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Was the defroster turned on? If so, then the A/C compressor was running as it automatically turns on in the defroster mode. And that would possibly explain the erratic idle rpm, and the clicking noise(A/C turning off).
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Had you disconnected the battery? If so, fluctuating idle rpm is normal until it relearns fuel trims.

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post #11 of 11 (permalink) Old 01-20-2010 Thread Starter
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No defroster and I had disconnected the battery, but it was some time ago (6 months ago).

2005 black GT premium (5spd) / GT500 front LCA/upper strut mounts / Koni Adjustable (yellow)shocks with Roush Springs / FRPP 4:10 rear gear / BMR rear UCA/LCA+relocation brackets / MGW Shifter / Bassani axle backs / Cervinis heat extractor hood and Ducktail spoiler / Carroll Shelby CS69 20x9/20x10 wheels / MSD Blaster 2 coils / Roush TVS2300 Supercharger+Brenspeed 560R upgrade / Exedy Mach 500 Stage 3 Clutch / Exedy lightweight flywheel / SR Performance braided stainless clutch Line / Afco Dual Fan Heat Exchanger upgrade / JLT Catch Can / Axle Exchange one piece aluminum DS / Silly grin on my face every time I turn the key.
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