TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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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...
__________________ all the free mods,air foil,k&n's gutted box,no maf screens,afpr,msd6a,headers hooker exhaust,ported and polished 305 heads,forged flat top pistons, semi ported intake,slp runners,ported plenum,roller tip rockers,oh and red anodized valve covers..
i posted this in the wrong forum could someone move this to the tpi forum.....thanks again...
__________________ all the free mods,air foil,k&n's gutted box,no maf screens,afpr,msd6a,headers hooker exhaust,ported and polished 305 heads,forged flat top pistons, semi ported intake,slp runners,ported plenum,roller tip rockers,oh and red anodized valve covers..
Sounds like your referring to Decel Fuel Cut Off. When decelerating, the ECM greatly reduces injector pulsewidth (sometimes completely off). Its normal.
__________________ 1991 Trans Am WS6 Convertible,
1987 Trans Am GTA hardtop
1987 Trans Am CC1, LS1/T56 AFR 205 heads, Comp Cams, LS6 intake
2005 Honda CBR 600RR
2007 Yukon XL Denali
2007 Saab 9-3SS
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.
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..
