bad gas mileage????
#1
Burning Brakes
Thread Starter
iTrader: (4)
bad gas mileage????
hey guys...my tl is getting bad gas mileage....timing belt..water pump..spark plugs and air filter were done about 2 months ago....and also both upstream o2 sensors...i have no cel on...i was wondering if it could be the imrc valve or something like that...i was reading some forums and it was just a thought...any help would be great
#3
iWhine S/C 6MT TL
iTrader: (1)
Yes posting mpg would help. Valve adjust is needed at 105k. It should have been done as the timing belt & spark plugs.
#5
Burning Brakes
Thread Starter
iTrader: (4)
im only getting just about 200 miles with a full tank....i filled up my tank last night...i frove 18 miles n the needle moved...at idle, the cluster shows 8 miles per gallon...while driving it shoes 13 miles per gallon...my valves are not noisy at all...what i noticed is that after like 3500 or 3800 rpm...my engine sounds loud and im losing power...
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#8
hey guys...my tl is getting bad gas mileage....timing belt..water pump..spark plugs and air filter were done about 2 months ago....and also both upstream o2 sensors...i have no cel on...i was wondering if it could be the imrc valve or something like that...i was reading some forums and it was just a thought...any help would be great
Also if you check for vacuum leaks.
Last edited by xmrgoodcatx; 12-01-2010 at 11:34 AM.
#9
hey guys...my tl is getting bad gas mileage....timing belt..water pump..spark plugs and air filter were done about 2 months ago....and also both upstream o2 sensors...i have no cel on...i was wondering if it could be the imrc valve or something like that...i was reading some forums and it was just a thought...any help would be great
#10
Burning Brakes
Thread Starter
iTrader: (4)
i have 125k on it....i allready did the seafoam....no luck...i used the vaccum line that is connected to the purge solenoid...the pcv valve was also done about 2 months ago....i was thinking that it might be the fuel filter but wouldnt my car like really run like shit cause the gas isnt getting to the motor?...i always use 93 and twice a month use the lucas fuel system cleaner....as for why i changed the two upstream 02 sensors was because like a month ago, i got a cel "p0171"...which is bank one too lean...i brought it to the dealer and was told that the rear 02 sensor was bad so i just changed both....the cel never returned....but im still getting bad mileage and loss of power
#11
i have 125k on it....i allready did the seafoam....no luck...i used the vaccum line that is connected to the purge solenoid...the pcv valve was also done about 2 months ago....i was thinking that it might be the fuel filter but wouldnt my car like really run like shit cause the gas isnt getting to the motor?...i always use 93 and twice a month use the lucas fuel system cleaner....as for why i changed the two upstream 02 sensors was because like a month ago, i got a cel "p0171"...which is bank one too lean...i brought it to the dealer and was told that the rear 02 sensor was bad so i just changed both....the cel never returned....but im still getting bad mileage and loss of power
#12
Team Owner
Mine has dipped down to 13mpg with pure city driving. It's on the low side but entirely possible with nothing wrong with the car. Your average mph would be a good indicator to tell if there's something wrong with the car or if it's the driving conditions.
FWIW, a dirty TB won't affect mileage nor will a bad PCV valve. Intake valves get noisier because the clearances get looser over time. Exhaust valves generally get tighter and don't make noise until it's too late.
FWIW, a dirty TB won't affect mileage nor will a bad PCV valve. Intake valves get noisier because the clearances get looser over time. Exhaust valves generally get tighter and don't make noise until it's too late.
#15
Team Owner
#17
Team Owner
#19
Team Owner
It can effect idle on DBW cars that don't use an IAC. When it's mostly closed, the extra buildup can choke off airflow and/or make it erratic. Once it's partially opened, there is no difference.
Don't worry about the drinks, I've had half a bottle of Nyquill lol. I'm probably worse off than you.
#22
Three Wheelin'
#23
Team Owner
My friend's 944 Porsche was off by one tooth and with the pedal to the floor in neutral it took about 10 seconds to hit 6,000rpm. 6-7,000 it made ok power lol.
Something I'm guilty of and I should not admit was timing an engine with a hangover and bending valves being only one notch off.
#24
Three Wheelin'
Totally agreed. I almost posted but everytime I say this, someone tells me about how their car ran perfect when it was 2 teeth off lol.
My friend's 944 Porsche was off by one tooth and with the pedal to the floor in neutral it took about 10 seconds to hit 6,000rpm. 6-7,000 it made ok power lol.
Something I'm guilty of and I should not admit was timing an engine with a hangover and bending valves being only one notch off.
My friend's 944 Porsche was off by one tooth and with the pedal to the floor in neutral it took about 10 seconds to hit 6,000rpm. 6-7,000 it made ok power lol.
Something I'm guilty of and I should not admit was timing an engine with a hangover and bending valves being only one notch off.
I accidentally missed one tooth doing the timing on the TL, at night..but didn't hit valves. Sure enough, it was noticeable to a deaf person. Only one tooth on one head. 3 Teeth, the car won't start. I found out accidentally, when the car wouldn't start after it had jumped 3-4 teeth lol..don't ask how
#25
Burning Brakes
Thread Starter
iTrader: (4)
allright....so then i can take that out the picture...now what about our 3 cats....i had my girl rev the car at a steady idle(4000) so i can see if any of the cats get red....im not getting a egg smell....but do you guys think that its possible for one of the cats to be clogged?...or do you think it can be one of the secondary o2 sensors have gone bad?....
#26
Burning Brakes
Thread Starter
iTrader: (4)
just an update...i swapped out the imrc valve and that didnt do no good....i was also thinking....what if my iat or map sensor went bad but isnt showing no cel....is that possible?
#27
Race Director
Let's re-examine the P0171 incident. If that was the only code, then your dealer did not make a correct diagnosis. According the the SM, there is no call to replace either the O2 or A/F sensors for a lone P0171 code. I have to assume your dealer detected a secondary code besides the P0171??
#28
Team Owner
We still don' t know your average mph or what type of driving you do. There may be nothing wrong with your car.
#29
Race Director
allright....so then i can take that out the picture...now what about our 3 cats....i had my girl rev the car at a steady idle(4000) so i can see if any of the cats get red....im not getting a egg smell....but do you guys think that its possible for one of the cats to be clogged?...or do you think it can be one of the secondary o2 sensors have gone bad?....
Bad (inefficient, non-functioning) 3rd CAT won't give a code (no A/F or O2 sensors). And I doubt it would affect mileage...
Clogged CAT (any) should reduce power noticeably.
#32
Burning Brakes
Thread Starter
iTrader: (4)
im still on the stock clutch...i have 125k....maybe its time to replace the clutch...could that give me bad gas mileage n power loss....its not slipping or anything
#37
#39
Team Owner
50mph would be very hard to average even if 5 of it was freeway. By the time you hit the freeway, go through some surface streets, and park it's not likely your mph is going to be at 50mph. Is this an estimate or off the MID? The reading off the MID will tell the story. Don't reset it, the longer the average the better. If the actual average is down in the low 20s, your mpg is somewhat normal. At an average of 19mph, my average was 13mpg.
You're making this extra hard. Let's find out if the car has an actual problem before we go troubleshooting.
You're making this extra hard. Let's find out if the car has an actual problem before we go troubleshooting.
#40
Burning Brakes
Thread Starter
iTrader: (4)
i used to get 320 miles with a full tank...now im only getting about 205 with a full tank....same type of driving as always...i would deff think there is something wrong....