awful bloody awful MPG

[lolcantturn]

Adjusted my valves, cleaned my AFM with brake cleaner.....
I'm getting 15mpg city now with very conservative driving. As in, I don't go over 2000rpm at any given moment.
Not satisfied though, my car still runs ice cold so it's most likely running rich as fuck.

[//MPower]

cleaned my AFM with brake cleaner.....

:roll: :loco: :???:

Please don't listen to anyone telling you to clean an Air Flow Meter by spraying something into the intake. They obviously have no idea what an AFM is, or how it works.

my car still runs ice cold so it's most likely running rich as fuck.

So your car is running cold? Have you checked/repaced the thermostat?

[lolcantturn]

So your car is running cold? Have you checked/repaced the thermostat?

I've replaced the thermostat 4 times..still runs cold.

[Kershaw]

are you replacing it with the correct thermostat? 80c? and maybe the sender to the gauge cluster is gone... or maybe the gauge itself..

clean the afm, the icv, and the throttle body at the same time. since you're there and already at the cleaning. use carb cleaner. brake cleaner. etc. pull them off the car (except the tb) and clean them. shoot cleaner up the tb and watch it turn super dirty brown on the way back down.

get a new fricken intake boot. they are only $20.

[lolcantturn]

are you replacing it with the correct thermostat? 80c? and maybe the sender to the gauge cluster is gone... or maybe the gauge itself..

clean the afm, the icv, and the throttle body at the same time. since you're there and already at the cleaning. use carb cleaner. brake cleaner. etc. pull them off the car (except the tb) and clean them. shoot cleaner up the tb and watch it turn super dirty brown on the way back down.

get a new fricken intake boot. they are only $20.

Yep 80C. What do you mean the "sender?" The coolant temp sensor? I don't think its the gauge, two weeks ago when I was having overheating problems due to a bad headgasket it went all the way to red so I don't know.

I cleaned the afm, the icv, and throttle body. brown stuff was all over my intake boot.
I think my intake boot could have leaks, but if it has a vacuum leak my idle sure doesn't show it..my idle is pretty good.

[KenC]

Jesus Christ there are idiots on here.

Spraying any sort of solvent into the intake through the AFM will not clean it. You need to clean and inspect the board. And for the love of god don't use carb cleaner or brake cleaner; those are powerful solvents... something you don't want on your circuit board. There are aerosol cleaners specifically for electronics. Get one of those.

Replace that duct taped intake boot.

Check for vacuum leaks.

You're running super rich. Usual culprit for this is a bad O2 sensor... why that wasn't the recommendation in the first reply is beyond me.

If your temp gauge is accurate and you're running that cold, it could also be causing it to run rich.


Running rich for extended amounts of time will foul your catalytic converter so be prepared to replace that as well.

[lolcantturn]

Jesus Christ there are idiots on here.

Spraying any sort of solvent into the intake through the AFM will not clean it. You need to clean and inspect the board. And for the love of god don't use carb cleaner or brake cleaner; those are powerful solvents... something you don't want on your circuit board. There are aerosol cleaners specifically for electronics. Get one of those.

Replace that duct taped intake boot.

Check for vacuum leaks.

You're running super rich. Usual culprit for this is a bad O2 sensor... why that wasn't the recommendation in the first reply is beyond me.

If your temp gauge is accurate and you're running that cold, it could also be causing it to run rich.


Running rich for extended amounts of time will foul your catalytic converter so be prepared to replace that as well.

Why thank you. I was kinda skeptical to spray a shitload of brake cleaner into my AFM, so I sprayed a little, then sprayed CRC electronics cleaner instead haha.

The O2 sensor is located in the exhaust manifold correct?

[KenC]

Why thank you. I was kinda skeptical to spray a shitload of brake cleaner into my AFM, so I sprayed a little, then sprayed CRC electronics cleaner instead haha.

The O2 sensor is located in the exhaust manifold correct?

Yes. Get a late 90s mustang GT O2 sensor and splice it in. Bosch brand.

[StereoInstaller1]

If your car isn't getting to proper temps, you will not be getting proper mileage.

Test your coolant temp sensor. If that gauge isn't close to the halfway mark, fix your shit until it does.

[KenC]

If your car isn't getting to proper temps, you will not be getting proper mileage.

Test your coolant temp sensor. If that gauge isn't close to the halfway mark, fix your shit until it does.

Word. Low operating temperature and bad O2 sensor are the two things I would tackle first.

[VasFinest]

OK so if I am reading this right the temp should read in the middle? Mine is almost always just above the blue... Not trying to thread jack, but that concerned me.

[lolcantturn]

Yes. Get a late 90s mustang GT O2 sensor and splice it in. Bosch brand.

Thanks, like 96 will do?

If your car isn't getting to proper temps, you will not be getting proper mileage.

Test your coolant temp sensor. If that gauge isn't close to the halfway mark, fix your shit until it does.

will do. So I let the car sit overnight so it's completely cold, and test the resistance, and it *should* read the resistance stated in the Bentley manual right?

[KenC]

Yeah '96 is fine.

Yes, ohm out that sensor. Doesn't have to be cold or anything.

[lolcantturn]

Yeah '96 is fine.

Yes, ohm out that sensor. Doesn't have to be cold or anything.

but if it's cold it reads out, to my understanding, a different resistance than when it's hot. that difference will show if the temp sensor is reading it too hot, or in my case, too cold. but im just wondering if i measure it when its ice cold.

[lolcantturn]

bump