75 mp every 1/2 tank and strong smell of fuel..WTF!!??
03-19-2005, 11:45 AM
#1
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75 mp every 1/2 tank and strong smell of fuel..WTF!!?? does anyone know what would cause me to get 75 miles per 1/2 tank and a strong smell of fuel?? I cant afford to be spending this much $$ on gas 
Thanks in advance
Thanks in advance
03-19-2005, 03:05 PM
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sorry,
well we scanned it with efi and played with hptuners as well. the ltrims were pegged out at 25 so we made the injectors smaller by 20% and that only dropped them to 18 or so. Before we reset them, they were at 8+ while cruising then we reset them and they were either negative or at 0
Mods are as follows:
99 Trans Am m6
f10 (228/228 114)
ls6 intake
prc springs
ngk plugs tr55
asp pulley
janzter TB
spec 3 clutch
LT's w/ true duals
tuned with edit by Sean Freese jan 05
oh yeah and im not throwing any codes or have any pending any ideas what it could be?
well we scanned it with efi and played with hptuners as well. the ltrims were pegged out at 25 so we made the injectors smaller by 20% and that only dropped them to 18 or so. Before we reset them, they were at 8+ while cruising then we reset them and they were either negative or at 0
Mods are as follows:
99 Trans Am m6
f10 (228/228 114)
ls6 intake
prc springs
ngk plugs tr55
asp pulley
janzter TB
spec 3 clutch
LT's w/ true duals
tuned with edit by Sean Freese jan 05
oh yeah and im not throwing any codes or have any pending
any ideas what it could be? 
03-19-2005, 04:22 PM
#6
Sounds like the tune is messed up. Since you have the same cam I have, my tune might be very close for you. I made VE changes, MAF TAble changes and Timing Changes. I left the IFR stock since they are stock. I still get 230mpt and that is mixed highway and city driving.
03-19-2005, 04:26 PM
#7
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sure you don't have a vacuum leak?
No SES lights for Front O2 Sensors? (the front O2 sensor codes weren't disabled w/a tuner right?)
Check for a vacuum leak (you can use any flammable spray, I use brake cleaner , spray around the intake manifold and everywhere post MAF ... make sure there's no unmetered air entering)
Do you have a surging idle too?
No SES lights for Front O2 Sensors? (the front O2 sensor codes weren't disabled w/a tuner right?)
Check for a vacuum leak (you can use any flammable spray, I use brake cleaner , spray around the intake manifold and everywhere post MAF ... make sure there's no unmetered air entering)
Do you have a surging idle too?
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03-19-2005, 05:29 PM
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i get the same mileage except on a stock car, lid and cutout, however my ltrims arent that high, and i dont smell gas. noone can figure it out! let me know whats wrong with your car.
03-19-2005, 06:28 PM
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im not sure of a leak, but i will check. the front o2's aren't disabled. The idel does surge a bit and there is quite a bit of bucking at lower rpms. The other thing is, that I noticed that there was something kinda wrong with the tune, but didnt think too much about it after i took it to him for the second time... it just started getting really really bad since last weekend. I havent done any modding except for the pulley this past wed, but it was doing it before then.
03-19-2005, 07:40 PM
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well i tightened up the tb bolts, intake bolts, header bolts, and sprayed everything i could with carb cleaner and no engine stumble. Also I forgot to mention that my IAT was at 20 or so, then ended up at about 40 (good) and then at the end it was between 0 and 15...so Ed (tuner) assumed it was a leak also......thanks so far everyone
03-20-2005, 12:37 PM
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as would I. I cant seem to find a vaccum leak at all!! Ever since Ed tinkered with the tune a bit, my mpg's seem to be a bit better, but to have to reduce the injector size by 20% is quite a stretch.
03-23-2005, 07:10 AM
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sounds like my exact problem yesterday! My LTB2 were way up to 25...
I think that usually means that theres gas getting into the cylinder that is not being burned...
check all your spark plug wires... my back 2 on bank 2 had rattled partially off.
Tyler
I think that usually means that theres gas getting into the cylinder that is not being burned...
check all your spark plug wires... my back 2 on bank 2 had rattled partially off.
Tyler
03-24-2005, 04:57 PM
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hmm..ill double check that....could make sense cause my 3rd and 8th cylinders are a tiny bit weaker than the rest. ill do it when it stops raining.