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TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.

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Old 10-06-2005, 09:34 AM   #1
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limp mode...????

iv'e noticed l8ly when letting off the gas to slow down for an off ramp that my idle drops and exhaust sounds different..haven't paid attention to it b4 sound normal..i have no codes...any ldeas guys.?????thanx for any help and just for reading this mess...
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Old 10-06-2005, 09:37 AM   #2
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sorry

i posted this in the wrong forum could someone move this to the tpi forum.....thanks again...
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Old 10-06-2005, 08:48 PM   #3
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Sounds like your referring to Decel Fuel Cut Off. When decelerating, the ECM greatly reduces injector pulsewidth (sometimes completely off). Its normal.
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Old 10-06-2005, 09:23 PM   #4
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Check MAF relays, fuel pressure
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Old 10-07-2005, 04:25 AM   #5
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Quote:
Originally posted by GMTech
Sounds like your referring to Decel Fuel Cut Off. When decelerating, the ECM greatly reduces injector pulsewidth (sometimes completely off). Its normal.
Is that on SD cars as well? Lately in my efforts to increase MPG's when I am coming to a stop or getting off the freeway or whatever, I put it in Nuetral and coast to a stop. But with what you said.....I wonder if it does any good. I figure for a half or quarter mile to be at 700rpms VS. staying in D at 2000-700 rpms, every bit of distance adds up fast during a week.
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Old 10-07-2005, 08:06 AM   #6
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my car

my car is maf and it responds if i get even a little touch on the peddle so im not thinking is really wrong, i just never really paed attention to it..
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