11 mpg
10-10-2011, 12:00 AM
#1
Registered User
Thread Starter
Join Date: Mar 2011
Location: Porterville, California
Posts: 102
11 mpg
Well Me Again, Back With Another Prob On My Older Z 79 280zx . So I Just Recently Got That Car Impounded And When I Got It Back It Ran Like Crap Im Getting About 11 Mpg
I Neeed Some Ideas On Where Else I Can Look For The Prob Heres What Ive Done So Far
-New Air Filter Fuel Filter
-Cleaned afm And Shifted The Plate Thing Over Allitle
-Checked For Vaccum Leaks No Luck
-Timming Is Alitle Off But Not By That Much
Any Other Ideas please Help Thanks
I Neeed Some Ideas On Where Else I Can Look For The Prob Heres What Ive Done So Far
-New Air Filter Fuel Filter
-Cleaned afm And Shifted The Plate Thing Over Allitle
-Checked For Vaccum Leaks No Luck
-Timming Is Alitle Off But Not By That Much
Any Other Ideas please Help Thanks
10-10-2011, 06:59 PM
#5
Registered User
Thread Starter
Join Date: Mar 2011
Location: Porterville, California
Posts: 102
My gas is fresh 91 octane that was like the first thing I checked
Timming spec is 10 degres right?
And is the chts in the front of the block ?? wich of the 4??
@rogerz lol
Timming spec is 10 degres right?
And is the chts in the front of the block ?? wich of the 4??
@rogerz lol
Last edited by Lupe; 10-10-2011 at 08:30 PM.
10-13-2011, 12:12 AM
#6
Registered User
Join Date: Jun 2002
Location: Alameda, CA
Posts: 903
When my mileage starts to drop (I drive 80 miles a day, so I tend to notice these things) this is what I check:
Air filter
Replace fuel filter (it depends on how long it's been in there... I usually replace every year)
Do an oil change (and filter)
Check tire pressure
Now, I'm not getting 11mpg when this happens... usually down from 25 to 20. But looking at the ticker, it's usually time for an oil change.
11mpg... If I had to take an educated guess, the CHTS is dirty. On the passenger side of the engine block, just under spark plug #6 (toward the firewall) you'll see it. Unplug it and clean the connectors really good with a small wire brush. Remove it from the block and take a clean cloth...wipe it off good. Don't use WD40 or anything like that, just a clean cloth. Put it all back together and fire it up, see what happens.
Air filter
Replace fuel filter (it depends on how long it's been in there... I usually replace every year)
Do an oil change (and filter)
Check tire pressure
Now, I'm not getting 11mpg when this happens... usually down from 25 to 20. But looking at the ticker, it's usually time for an oil change.
11mpg... If I had to take an educated guess, the CHTS is dirty. On the passenger side of the engine block, just under spark plug #6 (toward the firewall) you'll see it. Unplug it and clean the connectors really good with a small wire brush. Remove it from the block and take a clean cloth...wipe it off good. Don't use WD40 or anything like that, just a clean cloth. Put it all back together and fire it up, see what happens.
10-13-2011, 03:29 PM
#7
Registered User
Thread Starter
Join Date: Mar 2011
Location: Porterville, California
Posts: 102
i cheched ther for the sensor cuz my 81 has it ther but this car has so,ething else there it has a conection that has an inlet and outlet for coolant no wires or annything mine just has 4 sensorsd in the front
10-18-2011, 09:43 PM
#10
Grumpy & Helpful
Join Date: Sep 2006
Location: Mill Creek WA
Posts: 1,415
I believe the 79 did not have the chts back by #5 they were still using the coolant temp sensor like the 77/78 Z. it would be the one with two wires. coolant temp for gage is one wire. ground it out and see what your temp gage does (ignition on)
10-21-2011, 01:03 AM
#12
Registered User
Join Date: Jun 2002
Location: Alameda, CA
Posts: 903
If you're running that rich, there are more than likely 2 issues. You're not getting enough air, or there's a sensor telling your system that it's not getting enough fuel.
Try cleaning the TPS (throttle position sensor) with some decent electrical cleaning spray. Don't forget to disconnect the battery...just for fun. Then blow it off after it's dry with some canned air.
Reconnect the battery, fire it up and see what happens.
Try cleaning the TPS (throttle position sensor) with some decent electrical cleaning spray. Don't forget to disconnect the battery...just for fun. Then blow it off after it's dry with some canned air.
Reconnect the battery, fire it up and see what happens.
10-22-2011, 08:03 PM
#14
Mr Z++ Wiki
Join Date: Sep 2009
Location: Victoria, BC
Posts: 2,195
If you're running that rich, there are more than likely 2 issues. You're not getting enough air, or there's a sensor telling your system that it's not getting enough fuel.
Try cleaning the TPS (throttle position sensor) with some decent electrical cleaning spray. Don't forget to disconnect the battery...just for fun. Then blow it off after it's dry with some canned air.
Reconnect the battery, fire it up and see what happens.
Try cleaning the TPS (throttle position sensor) with some decent electrical cleaning spray. Don't forget to disconnect the battery...just for fun. Then blow it off after it's dry with some canned air.
Reconnect the battery, fire it up and see what happens.
10-22-2011, 10:02 PM
#15
Registered User
Thread Starter
Join Date: Mar 2011
Location: Porterville, California
Posts: 102
ok so i cleaned everything and still nothing i still tried that tps thing tho... im starting to think its something in my gas tank because i hooked up a guage and drove it and i saw the fuel pressure drops alot at high rpms and leans out the mixture and at idle runs really rich so posibly rusty gas tank or somin ill check it out tho and keep updated..
