possible vacuum leak?

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Apr 16, 2013 | 08:00 PM

Picco02

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Staging Lane

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From: Colorado

possible vacuum leak?

Alright so after just finishing a cam swap (TSP 228r), dual springs, trunion upgrade and all that good stuff, got my motor back together with a mail order tune from madtuner.com. Motor runs great besides the fact my fuel trims are off a bit which is to be expected with a mail order tune, but the thing that concerns me is when your in neutral and at idle, you rev the motor up to lets say 2,500 or more and you let it idle down it takes forever to idle down, not like before the cam swap or tune it idled down like normal. It is almost annoying how long it takes and if anyone had an idea if this could be part of the mail order tune not being accurate or if this could be some sort of vacuum leak? The only thing i forgot was the vacuum line for the heater controls which easily found out as soon as i turned on my heater and i connected that already and didn't change a thing. Im hoping its the tune because then it will be fixed when i can afford a proper dyno tune. Thanks for any input!!

Apr 16, 2013 | 09:05 PM

poltergeist 02

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Try a TPS relearn.

Apr 16, 2013 | 10:40 PM

Picco02

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Staging Lane

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From: Colorado

Do i just disconnect the battery for a certain amount of time to erase all the pcm memory?

Apr 17, 2013 | 12:31 PM

mark21742

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From: PA/MD

Unplug the tps and turn key on for 30 seconds.
Turn key off and plug tps back in then turn key on for 30 seconds.
Turn key back off and it is reset.

Apr 18, 2013 | 12:21 AM

Picco02

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Staging Lane

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From: Colorado

i appreciate it but I tried that and nothing changed it still idles down slowly

Apr 18, 2013 | 06:57 AM

Old Geezer

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The tune needs tweaking??
Post the tune file & some data logs.
Until that info is made available, it's just a guessing game.

Apr 18, 2013 | 07:51 AM

mark21742

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From: PA/MD

Quote:

Originally Posted by Old Geezer

The tune needs tweaking??
Post the tune file & some data logs.
Until that info is made available, it's just a guessing game.

I was thinking maybe something around the throttle cracker/ throttle follower area in the tune if a vacuum leak wasn't doing it

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Apr 20, 2013 | 11:13 AM

Picco02

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Staging Lane

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From: Colorado

Quote:

Originally Posted by Old Geezer

The tune needs tweaking??
Post the tune file & some data logs.
Until that info is made available, it's just a guessing game.

Unfortunatly i think you are right, i never got a tune file from them just a receipt. It would just be piece of mind knowing it was the tune and not my motor. I plan on getting a dyno tune this summer. The only thing i know for sure is my long term fuel trims are at 0 at idle and if you rev it up they sit at about 18 percent on the left trim and 25 on right trim so i know that is way off.